Merge pull request #1 from MoonchildProductions/master

keep up with mc

358 files changed, 2967 insertions, 11376 deletions

diff --git a/dom/animation/AnimationEffectReadOnly.cpp b/dom/animation/AnimationEffectReadOnly.cpp
index bf2e2197d..63d633c2f 100644
--- a/dom/animation/AnimationEffectReadOnly.cpp
+++ b/dom/animation/AnimationEffectReadOnly.cpp
@@ -23,7 +23,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AnimationEffectReadOnly)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument, mTiming, mAnimation)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(AnimationEffectReadOnly)
diff --git a/dom/animation/AnimationTimeline.cpp b/dom/animation/AnimationTimeline.cpp
index 643106807..f4a1ecc9a 100644
--- a/dom/animation/AnimationTimeline.cpp
+++ b/dom/animation/AnimationTimeline.cpp
@@ -21,7 +21,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AnimationTimeline)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWindow, mAnimations)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(AnimationTimeline)
diff --git a/dom/base/Attr.cpp b/dom/base/Attr.cpp
index 6eb3b49fd..71b559392 100644
--- a/dom/base/Attr.cpp
+++ b/dom/base/Attr.cpp
@@ -59,8 +59,6 @@ Attr::Attr(nsDOMAttributeMap *aAttrMap,
 NS_IMPL_CYCLE_COLLECTION_CLASS(Attr)
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Attr)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
-
   if (!nsINode::Traverse(tmp, cb)) {
     return NS_SUCCESS_INTERRUPTED_TRAVERSE;
   }
diff --git a/dom/base/CustomElementRegistry.cpp b/dom/base/CustomElementRegistry.cpp
index 00ee3d42f..3f202d33b 100644
--- a/dom/base/CustomElementRegistry.cpp
+++ b/dom/base/CustomElementRegistry.cpp
@@ -138,7 +138,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(CustomElementRegistry)
   }
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWhenDefinedPromiseMap)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWindow)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(CustomElementRegistry)
diff --git a/dom/base/DOMException.cpp b/dom/base/DOMException.cpp
index dfda47316..9fbb2f242 100644
--- a/dom/base/DOMException.cpp
+++ b/dom/base/DOMException.cpp
@@ -165,7 +165,6 @@ NS_IMPL_CYCLE_COLLECTION_CLASS(Exception)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Exception)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLocation)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mData)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Exception)
diff --git a/dom/base/DOMIntersectionObserver.cpp b/dom/base/DOMIntersectionObserver.cpp
index e39abf1a6..389b93071 100644
--- a/dom/base/DOMIntersectionObserver.cpp
+++ b/dom/base/DOMIntersectionObserver.cpp
@@ -43,16 +43,17 @@ NS_IMPL_CYCLE_COLLECTION_TRACE_END
 
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMIntersectionObserver)
   NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+  tmp->Disconnect();
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mCallback)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mRoot)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mQueuedEntries)
-  tmp->Disconnect();
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMIntersectionObserver)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCallback)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRoot)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mQueuedEntries)
@@ -153,30 +154,34 @@ DOMIntersectionObserver::Observe(Element& aTarget)
     return;
   }
   aTarget.RegisterIntersectionObserver(this);
-  mObservationTargets.PutEntry(&aTarget);
+  mObservationTargets.AppendElement(&aTarget);
   Connect();
 }
 
 void
 DOMIntersectionObserver::Unobserve(Element& aTarget)
 {
-  if (UnlinkTarget(aTarget)) {
-    aTarget.UnregisterIntersectionObserver(this);
+  if (!mObservationTargets.Contains(&aTarget)) {
+    // You're not on the list, buddy!
+    return;
   }
+  
+  if (mObservationTargets.Length() == 1) {
+    Disconnect();
+    return;
+  }
+
+  mObservationTargets.RemoveElement(&aTarget);
+  aTarget.UnregisterIntersectionObserver(this);
 }
 
-bool
+void
 DOMIntersectionObserver::UnlinkTarget(Element& aTarget)
 {
-    if (!mObservationTargets.Contains(&aTarget)) {
-        return false;
-    }
-    if (mObservationTargets.Count() == 1) {
-        Disconnect();
-        return false;
-    }
-    mObservationTargets.RemoveEntry(&aTarget);
-    return true;
+  mObservationTargets.RemoveElement(&aTarget);
+  if (mObservationTargets.Length() == 0) {
+    Disconnect();
+  }
 }
 
 void
@@ -185,10 +190,11 @@ DOMIntersectionObserver::Connect()
   if (mConnected) {
     return;
   }
+  
   mConnected = true;
-
-  nsIDocument* document = mOwner->GetExtantDoc();
-  document->AddIntersectionObserver(this);
+  if (mDocument) {
+    mDocument->AddIntersectionObserver(this);
+  }
 }
 
 void
@@ -197,18 +203,17 @@ DOMIntersectionObserver::Disconnect()
   if (!mConnected) {
     return;
   }
-  for (auto iter = mObservationTargets.Iter(); !iter.Done(); iter.Next()) {
-    Element* target = iter.Get()->GetKey();
+
+  mConnected = false;
+
+  for (size_t i = 0; i < mObservationTargets.Length(); ++i) {
+    Element* target = mObservationTargets.ElementAt(i);
     target->UnregisterIntersectionObserver(this);
   }
   mObservationTargets.Clear();
-  if (mOwner) {
-    nsIDocument* document = mOwner->GetExtantDoc();
-    if (document) {
-      document->RemoveIntersectionObserver(this);
-    }
+  if (mDocument) {
+    mDocument->RemoveIntersectionObserver(this);
   }
-  mConnected = false;
 }
 
 void
@@ -269,17 +274,21 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
     root = mRoot;
     rootFrame = root->GetPrimaryFrame();
     if (rootFrame) {
+      nsRect rootRectRelativeToRootFrame;
       if (rootFrame->GetType() == nsGkAtoms::scrollFrame) {
+        // rootRectRelativeToRootFrame should be the content rect of rootFrame, not including the scrollbars.
         nsIScrollableFrame* scrollFrame = do_QueryFrame(rootFrame);
-        rootRect = nsLayoutUtils::TransformFrameRectToAncestor(
-          rootFrame,
-          rootFrame->GetContentRectRelativeToSelf(),
-          scrollFrame->GetScrolledFrame());
+        rootRectRelativeToRootFrame = scrollFrame->GetScrollPortRect();
       } else {
-        rootRect = nsLayoutUtils::GetAllInFlowRectsUnion(rootFrame,
-          nsLayoutUtils::GetContainingBlockForClientRect(rootFrame),
-          nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS);
+        // rootRectRelativeToRootFrame should be the border rect of rootFrame.
+        rootRectRelativeToRootFrame = rootFrame->GetRectRelativeToSelf();
       }
+      nsIFrame* containingBlock =
+        nsLayoutUtils::GetContainingBlockForClientRect(rootFrame);
+      rootRect =
+        nsLayoutUtils::TransformFrameRectToAncestor(rootFrame,
+                                                    rootRectRelativeToRootFrame,
+                                                    containingBlock);
     }
   } else {
     nsCOMPtr<nsIPresShell> presShell = aDocument->GetShell();
@@ -288,12 +297,25 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
       if (rootFrame) {
         nsPresContext* presContext = rootFrame->PresContext();
         while (!presContext->IsRootContentDocument()) {
-          presContext = rootFrame->PresContext()->GetParentPresContext();
-          rootFrame = presContext->PresShell()->GetRootScrollFrame();
+          // Walk up the tree
+          presContext = presContext->GetParentPresContext();
+          if (!presContext) {
+            break;
+          }
+          nsIFrame* rootScrollFrame = presContext->PresShell()->GetRootScrollFrame();
+          if (rootScrollFrame) {
+            rootFrame = rootScrollFrame;
+          } else {
+            break;
+          }
         }
         root = rootFrame->GetContent()->AsElement();
         nsIScrollableFrame* scrollFrame = do_QueryFrame(rootFrame);
-        rootRect = scrollFrame->GetScrollPortRect();
+        // If we end up with a null root frame for some reason, we'll proceed
+        // with an empty root intersection rect.
+        if (scrollFrame) {
+          rootRect = scrollFrame->GetScrollPortRect();
+        }
       }
     }
   }
@@ -314,11 +336,12 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
     rootMargin.Side(side) = nsLayoutUtils::ComputeCBDependentValue(basis, coord);
   }
 
-  for (auto iter = mObservationTargets.Iter(); !iter.Done(); iter.Next()) {
-    Element* target = iter.Get()->GetKey();
+  for (size_t i = 0; i < mObservationTargets.Length(); ++i) {
+    Element* target = mObservationTargets.ElementAt(i);
     nsIFrame* targetFrame = target->GetPrimaryFrame();
     nsRect targetRect;
     Maybe<nsRect> intersectionRect;
+    bool isSameDoc = root && root->GetComposedDoc() == target->GetComposedDoc();
 
     if (rootFrame && targetFrame) {
       // If mRoot is set we are testing intersection with a container element
@@ -327,7 +350,7 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
         // Skip further processing of this target if it is not in the same
         // Document as the intersection root, e.g. if root is an element of
         // the main document and target an element from an embedded iframe.
-        if (target->GetComposedDoc() != root->GetComposedDoc()) {
+        if (!isSameDoc) {
           continue;
         }
         // Skip further processing of this target if is not a descendant of the
@@ -344,7 +367,7 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
         nsLayoutUtils::GetContainingBlockForClientRect(targetFrame),
         nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS
       );
-      intersectionRect = Some(targetFrame->GetVisualOverflowRect());
+      intersectionRect = Some(targetFrame->GetRectRelativeToSelf());
 
       nsIFrame* containerFrame = nsLayoutUtils::GetCrossDocParentFrame(targetFrame);
       while (containerFrame && containerFrame != rootFrame) {
@@ -399,29 +422,37 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
         intersectionRectRelativeToRoot,
         rootIntersectionRect
       );
-      if (intersectionRect.isSome()) {
-        intersectionRect = Some(nsLayoutUtils::TransformFrameRectToAncestor(
-          nsLayoutUtils::GetContainingBlockForClientRect(rootFrame),
-          intersectionRect.value(),
-          targetFrame->PresContext()->PresShell()->GetRootScrollFrame()
-        ));
+      if (intersectionRect.isSome() && !isSameDoc) {
+        nsRect rect = intersectionRect.value();
+        nsPresContext* presContext = targetFrame->PresContext();
+        nsLayoutUtils::TransformRect(rootFrame,
+          presContext->PresShell()->GetRootScrollFrame(), rect);
+        intersectionRect = Some(rect);
       }
     }
 
-    double targetArea = targetRect.width * targetRect.height;
-    double intersectionArea = !intersectionRect ?
-      0 : intersectionRect->width * intersectionRect->height;
-    double intersectionRatio = targetArea > 0.0 ? intersectionArea / targetArea : 0.0;
+    int64_t targetArea =
+      (int64_t) targetRect.Width() * (int64_t) targetRect.Height();
+    int64_t intersectionArea = !intersectionRect ? 0 :
+      (int64_t) intersectionRect->Width() *
+      (int64_t) intersectionRect->Height();
+    
+    double intersectionRatio;
+    if (targetArea > 0.0) {
+      intersectionRatio = (double) intersectionArea / (double) targetArea;
+    } else {
+      intersectionRatio = intersectionRect.isSome() ? 1.0 : 0.0;
+    }
 
-    size_t threshold = -1;
+    int32_t threshold = -1;
     if (intersectionRatio > 0.0) {
       if (intersectionRatio >= 1.0) {
         intersectionRatio = 1.0;
-        threshold = mThresholds.Length();
+        threshold = (int32_t)mThresholds.Length();
       } else {
         for (size_t k = 0; k < mThresholds.Length(); ++k) {
           if (mThresholds[k] <= intersectionRatio) {
-            threshold = k + 1;
+            threshold = (int32_t)k + 1;
           } else {
             break;
           }
@@ -468,6 +499,7 @@ DOMIntersectionObserver::QueueIntersectionObserverEntry(Element* aTarget,
     rootBounds.forget(),
     boundingClientRect.forget(),
     intersectionRect.forget(),
+    aIntersectionRect.isSome(),
     aTarget, aIntersectionRatio);
   mQueuedEntries.AppendElement(entry.forget());
 }
@@ -480,7 +512,7 @@ DOMIntersectionObserver::Notify()
   }
   mozilla::dom::Sequence<mozilla::OwningNonNull<DOMIntersectionObserverEntry>> entries;
   if (entries.SetCapacity(mQueuedEntries.Length(), mozilla::fallible)) {
-    for (uint32_t i = 0; i < mQueuedEntries.Length(); ++i) {
+    for (size_t i = 0; i < mQueuedEntries.Length(); ++i) {
       RefPtr<DOMIntersectionObserverEntry> next = mQueuedEntries[i];
       *entries.AppendElement(mozilla::fallible) = next;
     }
diff --git a/dom/base/DOMIntersectionObserver.h b/dom/base/DOMIntersectionObserver.h
index 8144fc5c5..8674fe25d 100644
--- a/dom/base/DOMIntersectionObserver.h
+++ b/dom/base/DOMIntersectionObserver.h
@@ -30,6 +30,7 @@ public:
                                RefPtr<DOMRect> aRootBounds,
                                RefPtr<DOMRect> aBoundingClientRect,
                                RefPtr<DOMRect> aIntersectionRect,
+                               bool aIsIntersecting,
                                Element* aTarget,
                                double aIntersectionRatio)
   : mOwner(aOwner),
@@ -37,6 +38,7 @@ public:
     mRootBounds(aRootBounds),
     mBoundingClientRect(aBoundingClientRect),
     mIntersectionRect(aIntersectionRect),
+    mIsIntersecting(aIsIntersecting),
     mTarget(aTarget),
     mIntersectionRatio(aIntersectionRatio)
   {
@@ -74,6 +76,11 @@ public:
     return mIntersectionRect;
   }
 
+  bool IsIntersecting()
+  {
+    return mIsIntersecting;
+  }
+
   double IntersectionRatio()
   {
     return mIntersectionRatio;
@@ -90,6 +97,7 @@ protected:
   RefPtr<DOMRect>       mRootBounds;
   RefPtr<DOMRect>       mBoundingClientRect;
   RefPtr<DOMRect>       mIntersectionRect;
+  bool                  mIsIntersecting;
   RefPtr<Element>       mTarget;
   double                mIntersectionRatio;
 };
@@ -101,12 +109,17 @@ protected:
 class DOMIntersectionObserver final : public nsISupports,
                                       public nsWrapperCache
 {
-  virtual ~DOMIntersectionObserver() { }
+  virtual ~DOMIntersectionObserver() {
+    Disconnect();
+  }
 
 public:
   DOMIntersectionObserver(already_AddRefed<nsPIDOMWindowInner>&& aOwner,
                           mozilla::dom::IntersectionCallback& aCb)
-  : mOwner(aOwner), mCallback(&aCb), mConnected(false)
+  : mOwner(aOwner)
+  , mDocument(mOwner->GetExtantDoc())
+  , mCallback(&aCb)
+  , mConnected(false)
   {
   }
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
@@ -142,7 +155,7 @@ public:
   void Observe(Element& aTarget);
   void Unobserve(Element& aTarget);
 
-  bool UnlinkTarget(Element& aTarget);
+  void UnlinkTarget(Element& aTarget);
   void Disconnect();
 
   void TakeRecords(nsTArray<RefPtr<DOMIntersectionObserverEntry>>& aRetVal);
@@ -164,11 +177,15 @@ protected:
                                       double aIntersectionRatio);
 
   nsCOMPtr<nsPIDOMWindowInner>                    mOwner;
+  RefPtr<nsIDocument>                             mDocument;
   RefPtr<mozilla::dom::IntersectionCallback>      mCallback;
   RefPtr<Element>                                 mRoot;
   nsCSSRect                                       mRootMargin;
   nsTArray<double>                                mThresholds;
-  nsTHashtable<nsPtrHashKey<Element>>             mObservationTargets;
+  
+  // Holds raw pointers which are explicitly cleared by UnlinkTarget().
+  nsTArray<Element*>                              mObservationTargets;
+  
   nsTArray<RefPtr<DOMIntersectionObserverEntry>>  mQueuedEntries;
   bool                                            mConnected;
 };
diff --git a/dom/base/Element.cpp b/dom/base/Element.cpp
index 79b36a314..5c3277e84 100644
--- a/dom/base/Element.cpp
+++ b/dom/base/Element.cpp
@@ -145,7 +145,6 @@
 #include "mozilla/dom/KeyframeEffectBinding.h"
 #include "mozilla/dom/WindowBinding.h"
 #include "mozilla/dom/ElementBinding.h"
-#include "mozilla/dom/VRDisplay.h"
 #include "mozilla/IntegerPrintfMacros.h"
 #include "mozilla/Preferences.h"
 #include "nsComputedDOMStyle.h"
@@ -688,19 +687,23 @@ Element::GetScrollFrame(nsIFrame **aStyledFrame, bool aFlushLayout)
 }
 
 void
-Element::ScrollIntoView()
+Element::ScrollIntoView(const BooleanOrScrollIntoViewOptions& aObject)
 {
-  ScrollIntoView(ScrollIntoViewOptions());
-}
+  if (aObject.IsScrollIntoViewOptions()) {
+    return ScrollIntoView(aObject.GetAsScrollIntoViewOptions());
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(aObject.IsBoolean());
 
-void
-Element::ScrollIntoView(bool aTop)
-{
   ScrollIntoViewOptions options;
-  if (!aTop) {
+  if (aObject.GetAsBoolean()) {
+    options.mBlock = ScrollLogicalPosition::Start;
+    options.mInline = ScrollLogicalPosition::Nearest;
+  } else {
     options.mBlock = ScrollLogicalPosition::End;
+    options.mInline = ScrollLogicalPosition::Nearest;
   }
-  ScrollIntoView(options);
+  return ScrollIntoView(options);
 }
 
 void
@@ -717,9 +720,41 @@ Element::ScrollIntoView(const ScrollIntoViewOptions &aOptions)
     return;
   }
 
-  int16_t vpercent = (aOptions.mBlock == ScrollLogicalPosition::Start)
-                       ? nsIPresShell::SCROLL_TOP
-                       : nsIPresShell::SCROLL_BOTTOM;
+  int16_t vpercent = nsIPresShell::SCROLL_CENTER;
+  switch (aOptions.mBlock) {
+    case ScrollLogicalPosition::Start:
+      vpercent = nsIPresShell::SCROLL_TOP;
+      break;
+    case ScrollLogicalPosition::Center:
+      vpercent = nsIPresShell::SCROLL_CENTER;
+      break;
+    case ScrollLogicalPosition::End:
+      vpercent = nsIPresShell::SCROLL_BOTTOM;
+      break;
+    case ScrollLogicalPosition::Nearest:
+      vpercent = nsIPresShell::SCROLL_MINIMUM;
+      break;
+    default:
+      MOZ_ASSERT_UNREACHABLE("Unexpected ScrollLogicalPosition value");
+  }
+
+  int16_t hpercent = nsIPresShell::SCROLL_CENTER;
+  switch (aOptions.mInline) {
+    case ScrollLogicalPosition::Start:
+      hpercent = nsIPresShell::SCROLL_LEFT;
+      break;
+    case ScrollLogicalPosition::Center:
+      hpercent = nsIPresShell::SCROLL_CENTER;
+      break;
+    case ScrollLogicalPosition::End:
+      hpercent = nsIPresShell::SCROLL_RIGHT;
+      break;
+    case ScrollLogicalPosition::Nearest:
+      hpercent = nsIPresShell::SCROLL_MINIMUM;
+      break;
+    default:
+      MOZ_ASSERT_UNREACHABLE("Unexpected ScrollLogicalPosition value");
+  }
 
   uint32_t flags = nsIPresShell::SCROLL_OVERFLOW_HIDDEN;
   if (aOptions.mBehavior == ScrollBehavior::Smooth) {
@@ -732,7 +767,9 @@ Element::ScrollIntoView(const ScrollIntoViewOptions &aOptions)
                                    nsIPresShell::ScrollAxis(
                                      vpercent,
                                      nsIPresShell::SCROLL_ALWAYS),
-                                   nsIPresShell::ScrollAxis(),
+                                   nsIPresShell::ScrollAxis(
+                                     hpercent,
+                                     nsIPresShell::SCROLL_ALWAYS),
                                    flags);
 }
 
@@ -3948,7 +3985,7 @@ Element::ClearDataset()
   slots->mDataset = nullptr;
 }
 
-nsDataHashtable<nsPtrHashKey<DOMIntersectionObserver>, int32_t>*
+nsDataHashtable<nsRefPtrHashKey<DOMIntersectionObserver>, int32_t>*
 Element::RegisteredIntersectionObservers()
 {
   nsDOMSlots* slots = DOMSlots();
@@ -3963,7 +4000,7 @@ enum nsPreviousIntersectionThreshold {
 void
 Element::RegisterIntersectionObserver(DOMIntersectionObserver* aObserver)
 {
-  nsDataHashtable<nsPtrHashKey<DOMIntersectionObserver>, int32_t>* observers =
+  nsDataHashtable<nsRefPtrHashKey<DOMIntersectionObserver>, int32_t>* observers =
     RegisteredIntersectionObservers();
   if (observers->Contains(aObserver)) {
     return;
@@ -3980,7 +4017,7 @@ Element::RegisterIntersectionObserver(DOMIntersectionObserver* aObserver)
 void
 Element::UnregisterIntersectionObserver(DOMIntersectionObserver* aObserver)
 {
-  nsDataHashtable<nsPtrHashKey<DOMIntersectionObserver>, int32_t>* observers =
+  nsDataHashtable<nsRefPtrHashKey<DOMIntersectionObserver>, int32_t>* observers =
     RegisteredIntersectionObservers();
   observers->Remove(aObserver);
 }
@@ -3988,7 +4025,7 @@ Element::UnregisterIntersectionObserver(DOMIntersectionObserver* aObserver)
 bool
 Element::UpdateIntersectionObservation(DOMIntersectionObserver* aObserver, int32_t aThreshold)
 {
-  nsDataHashtable<nsPtrHashKey<DOMIntersectionObserver>, int32_t>* observers =
+  nsDataHashtable<nsRefPtrHashKey<DOMIntersectionObserver>, int32_t>* observers =
     RegisteredIntersectionObservers();
   if (!observers->Contains(aObserver)) {
     return false;
diff --git a/dom/base/Element.h b/dom/base/Element.h
index c269ab14a..ce84b74fb 100644
--- a/dom/base/Element.h
+++ b/dom/base/Element.h
@@ -818,9 +818,10 @@ public:
     return slots ? slots->mShadowRoot.get() : nullptr;
   }
 
-  void ScrollIntoView();
-  void ScrollIntoView(bool aTop);
+private:
   void ScrollIntoView(const ScrollIntoViewOptions &aOptions);
+public:
+  void ScrollIntoView(const BooleanOrScrollIntoViewOptions& aObject);
   void Scroll(double aXScroll, double aYScroll);
   void Scroll(const ScrollToOptions& aOptions);
   void ScrollTo(double aXScroll, double aYScroll);
@@ -1382,7 +1383,8 @@ protected:
   nsDOMTokenList* GetTokenList(nsIAtom* aAtom,
                                const DOMTokenListSupportedTokenArray aSupportedTokens = nullptr);
 
-  nsDataHashtable<nsPtrHashKey<DOMIntersectionObserver>, int32_t>* RegisteredIntersectionObservers();
+  nsDataHashtable<nsRefPtrHashKey<DOMIntersectionObserver>, int32_t>* 
+    RegisteredIntersectionObservers();
 
 private:
   /**
diff --git a/dom/base/File.cpp b/dom/base/File.cpp
index 7d86dfe8a..1d5ab73e7 100755
--- a/dom/base/File.cpp
+++ b/dom/base/File.cpp
@@ -138,7 +138,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Blob)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Blob)
diff --git a/dom/base/FormData.cpp b/dom/base/FormData.cpp
index 6095286be..52bdd9210 100644
--- a/dom/base/FormData.cpp
+++ b/dom/base/FormData.cpp
@@ -84,7 +84,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(FormData)
                                 "mFormData[i].GetAsBlob()", 0);
   }
 
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(FormData)
diff --git a/dom/base/FragmentOrElement.cpp b/dom/base/FragmentOrElement.cpp
index fde983e7c..9106778df 100644
--- a/dom/base/FragmentOrElement.cpp
+++ b/dom/base/FragmentOrElement.cpp
@@ -585,6 +585,12 @@ FragmentOrElement::nsDOMSlots::Traverse(nsCycleCollectionTraversalCallback &cb,
       mCustomElementData->mCallbackQueue[i]->Traverse(cb);
     }
   }
+
+  for (auto iter = mRegisteredIntersectionObservers.Iter(); !iter.Done(); iter.Next()) {
+    DOMIntersectionObserver* observer = iter.Key();
+    NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mRegisteredIntersectionObservers[i]");
+    cb.NoteXPCOMChild(observer);
+  }
 }
 
 void
@@ -1872,10 +1878,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(FragmentOrElement)
     NS_IMPL_CYCLE_COLLECTION_DESCRIBE(FragmentOrElement, tmp->mRefCnt.get())
   }
 
-  // Always need to traverse script objects, so do that before we check
-  // if we're uncollectable.
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
-
   if (!nsINode::Traverse(tmp, cb)) {
     return NS_SUCCESS_INTERRUPTED_TRAVERSE;
   }
diff --git a/dom/base/FragmentOrElement.h b/dom/base/FragmentOrElement.h
index 7c74e9cd4..f0cc29f22 100644
--- a/dom/base/FragmentOrElement.h
+++ b/dom/base/FragmentOrElement.h
@@ -354,7 +354,8 @@ public:
     /**
      * Registered Intersection Observers on the element.
      */
-    nsDataHashtable<nsPtrHashKey<DOMIntersectionObserver>, int32_t> mRegisteredIntersectionObservers;
+    nsDataHashtable<nsRefPtrHashKey<DOMIntersectionObserver>, int32_t> 
+      mRegisteredIntersectionObservers;
   };
 
 protected:
diff --git a/dom/base/Location.cpp b/dom/base/Location.cpp
index 7b3722f09..1483c32f9 100644
--- a/dom/base/Location.cpp
+++ b/dom/base/Location.cpp
@@ -33,6 +33,7 @@
 #include "nsCycleCollectionParticipant.h"
 #include "nsNullPrincipal.h"
 #include "ScriptSettings.h"
+#include "mozilla/Unused.h"
 #include "mozilla/dom/LocationBinding.h"
 
 namespace mozilla {
@@ -79,7 +80,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Location)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mInnerWindow)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(Location)
@@ -716,9 +716,15 @@ Location::SetProtocol(const nsAString& aProtocol)
     return rv;
   }
 
-  rv = uri->SetScheme(NS_ConvertUTF16toUTF8(aProtocol));
+  nsAString::const_iterator start, end;
+  aProtocol.BeginReading(start);
+  aProtocol.EndReading(end);
+  nsAString::const_iterator iter(start);
+  Unused << FindCharInReadable(':', iter, end);
+
+  rv = uri->SetScheme(NS_ConvertUTF16toUTF8(Substring(start, iter)));
   if (NS_WARN_IF(NS_FAILED(rv))) {
-    return rv;
+    return NS_ERROR_DOM_SYNTAX_ERR;
   }
   nsAutoCString newSpec;
   rv = uri->GetSpec(newSpec);
@@ -728,9 +734,29 @@ Location::SetProtocol(const nsAString& aProtocol)
   // We may want a new URI class for the new URI, so recreate it:
   rv = NS_NewURI(getter_AddRefs(uri), newSpec);
   if (NS_FAILED(rv)) {
+    if (rv == NS_ERROR_MALFORMED_URI) {
+      rv = NS_ERROR_DOM_SYNTAX_ERR;
+    }
+    return rv;
+  }
+  
+  bool isHttp;
+  rv = uri->SchemeIs("http", &isHttp);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  bool isHttps;
+  rv = uri->SchemeIs("https", &isHttps);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }
 
+  if (!isHttp && !isHttps) {
+    // No-op, per spec.
+    return NS_OK;
+  }
+
   return SetURI(uri);
 }
 
@@ -763,10 +789,6 @@ Location::GetSearch(nsAString& aSearch)
 NS_IMETHODIMP
 Location::SetSearch(const nsAString& aSearch)
 {
-  if (aSearch.IsEmpty()) {
-    return NS_OK; // Ignore empty string
-  }
-
   nsresult rv = SetSearchInternal(aSearch);
   if (NS_FAILED(rv)) {
     return rv;
diff --git a/dom/base/Navigator.cpp b/dom/base/Navigator.cpp
index ed96ee23b..fdf151b6c 100644
--- a/dom/base/Navigator.cpp
+++ b/dom/base/Navigator.cpp
@@ -44,7 +44,6 @@
 #include "mozilla/dom/ServiceWorkerContainer.h"
 #include "mozilla/dom/StorageManager.h"
 #include "mozilla/dom/TCPSocket.h"
-#include "mozilla/dom/VRDisplay.h"
 #include "mozilla/dom/workers/RuntimeService.h"
 #include "mozilla/Hal.h"
 #include "nsISiteSpecificUserAgent.h"
@@ -224,7 +223,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Navigator)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mGamepadServiceTest)
 #endif
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mVRGetDisplaysPromises)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(Navigator)
@@ -684,8 +682,6 @@ Navigator::GetDoNotTrack(nsAString &aResult)
 bool
 Navigator::JavaEnabled(ErrorResult& aRv)
 {
-  Telemetry::AutoTimer<Telemetry::CHECK_JAVA_ENABLED> telemetryTimer;
-
   // Return true if we have a handler for the java mime
   nsAdoptingString javaMIME = Preferences::GetString("plugin.java.mime");
   NS_ENSURE_TRUE(!javaMIME.IsEmpty(), false);
@@ -1473,83 +1469,6 @@ Navigator::RequestGamepadServiceTest()
 }
 #endif
 
-already_AddRefed<Promise>
-Navigator::GetVRDisplays(ErrorResult& aRv)
-{
-  if (!mWindow || !mWindow->GetDocShell()) {
-    aRv.Throw(NS_ERROR_UNEXPECTED);
-    return nullptr;
-  }
-
-  nsGlobalWindow* win = nsGlobalWindow::Cast(mWindow);
-  win->NotifyVREventListenerAdded();
-
-  nsCOMPtr<nsIGlobalObject> go = do_QueryInterface(mWindow);
-  RefPtr<Promise> p = Promise::Create(go, aRv);
-  if (aRv.Failed()) {
-    return nullptr;
-  }
-
-  // We pass mWindow's id to RefreshVRDisplays, so NotifyVRDisplaysUpdated will
-  // be called asynchronously, resolving the promises in mVRGetDisplaysPromises.
-  if (!VRDisplay::RefreshVRDisplays(win->WindowID())) {
-    p->MaybeReject(NS_ERROR_FAILURE);
-    return p.forget();
-  }
-
-  mVRGetDisplaysPromises.AppendElement(p);
-  return p.forget();
-}
-
-void
-Navigator::GetActiveVRDisplays(nsTArray<RefPtr<VRDisplay>>& aDisplays) const
-{
-  /**
-   * Get only the active VR displays.
-   * Callers do not wish to VRDisplay::RefreshVRDisplays, as the enumeration may
-   * activate hardware that is not yet intended to be used.
-   */
-  if (!mWindow || !mWindow->GetDocShell()) {
-    return;
-  }
-  nsGlobalWindow* win = nsGlobalWindow::Cast(mWindow);
-  win->NotifyVREventListenerAdded();
-  nsTArray<RefPtr<VRDisplay>> displays;
-  if (win->UpdateVRDisplays(displays)) {
-    for (auto display : displays) {
-      if (display->IsPresenting()) {
-        aDisplays.AppendElement(display);
-      }
-    }
-  }
-}
-
-void
-Navigator::NotifyVRDisplaysUpdated()
-{
-  // Synchronize the VR devices and resolve the promises in
-  // mVRGetDisplaysPromises
-  nsGlobalWindow* win = nsGlobalWindow::Cast(mWindow);
-
-  nsTArray<RefPtr<VRDisplay>> vrDisplays;
-  if (win->UpdateVRDisplays(vrDisplays)) {
-    for (auto p : mVRGetDisplaysPromises) {
-      p->MaybeResolve(vrDisplays);
-    }
-  } else {
-    for (auto p : mVRGetDisplaysPromises) {
-      p->MaybeReject(NS_ERROR_FAILURE);
-    }
-  }
-  mVRGetDisplaysPromises.Clear();
-}
-
-void
-Navigator::NotifyActiveVRDisplaysChanged()
-{
-  NavigatorBinding::ClearCachedActiveVRDisplaysValue(this);
-}
-
 //*****************************************************************************
 //    Navigator::nsIMozNavigatorNetwork
 //*****************************************************************************
diff --git a/dom/base/Navigator.h b/dom/base/Navigator.h
index d47a80bc1..91b7fc15c 100644
--- a/dom/base/Navigator.h
+++ b/dom/base/Navigator.h
@@ -76,7 +76,6 @@ class Connection;
 class PowerManager;
 class Presentation;
 class LegacyMozTCPSocket;
-class VRDisplay;
 class StorageManager;
 
 namespace time {
@@ -204,8 +203,6 @@ public:
   void GetGamepads(nsTArray<RefPtr<Gamepad> >& aGamepads, ErrorResult& aRv);
   GamepadServiceTest* RequestGamepadServiceTest();
 #endif // MOZ_GAMEPAD
-  already_AddRefed<Promise> GetVRDisplays(ErrorResult& aRv);
-  void GetActiveVRDisplays(nsTArray<RefPtr<VRDisplay>>& aDisplays) const;
 #ifdef MOZ_TIME_MANAGER
   time::TimeManager* GetMozTime(ErrorResult& aRv);
 #endif // MOZ_TIME_MANAGER
@@ -269,10 +266,6 @@ private:
   RefPtr<MediaKeySystemAccessManager> mMediaKeySystemAccessManager;
 #endif
 
-public:
-  void NotifyVRDisplaysUpdated();
-  void NotifyActiveVRDisplaysChanged();
-
 private:
   virtual ~Navigator();
 
diff --git a/dom/base/Pose.cpp b/dom/base/Pose.cpp
index 1eab4c173..5bc4ca6de 100644
--- a/dom/base/Pose.cpp
+++ b/dom/base/Pose.cpp
@@ -26,7 +26,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Pose)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Pose)
diff --git a/dom/base/ProcessGlobal.cpp b/dom/base/ProcessGlobal.cpp
index 641f49f98..6cd29ab7c 100644
--- a/dom/base/ProcessGlobal.cpp
+++ b/dom/base/ProcessGlobal.cpp
@@ -52,7 +52,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ProcessGlobal)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mMessageManager)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mGlobal)
   tmp->TraverseHostObjectURIs(cb);
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ProcessGlobal)
diff --git a/dom/base/nsAttrAndChildArray.cpp b/dom/base/nsAttrAndChildArray.cpp
index b285ee003..9fd27262b 100644
--- a/dom/base/nsAttrAndChildArray.cpp
+++ b/dom/base/nsAttrAndChildArray.cpp
@@ -78,15 +78,8 @@ GetIndexFromCache(const nsAttrAndChildArray* aArray)
 }
 
 
-/**
- * Due to a compiler bug in VisualAge C++ for AIX, we need to return the
- * address of the first index into mBuffer here, instead of simply returning
- * mBuffer itself.
- *
- * See Bug 231104 for more information.
- */
 #define ATTRS(_impl) \
-  reinterpret_cast<InternalAttr*>(&((_impl)->mBuffer[0]))
+  reinterpret_cast<InternalAttr*>((_impl)->mBuffer)
 
 
 #define NS_IMPL_EXTRA_SIZE \
diff --git a/dom/base/nsCCUncollectableMarker.cpp b/dom/base/nsCCUncollectableMarker.cpp
index 861cda521..db4d0d351 100644
--- a/dom/base/nsCCUncollectableMarker.cpp
+++ b/dom/base/nsCCUncollectableMarker.cpp
@@ -188,23 +188,20 @@ MarkMessageManagers()
 }
 
 void
-MarkContentViewer(nsIContentViewer* aViewer, bool aCleanupJS,
-                  bool aPrepareForCC)
+MarkDocument(nsIDocument* aDoc, bool aCleanupJS, bool aPrepareForCC)
 {
-  if (!aViewer) {
+  if (!aDoc) {
     return;
   }
 
-  nsIDocument *doc = aViewer->GetDocument();
-  if (doc &&
-      doc->GetMarkedCCGeneration() != nsCCUncollectableMarker::sGeneration) {
-    doc->MarkUncollectableForCCGeneration(nsCCUncollectableMarker::sGeneration);
+  if (aDoc->GetMarkedCCGeneration() != nsCCUncollectableMarker::sGeneration) {
+    aDoc->MarkUncollectableForCCGeneration(nsCCUncollectableMarker::sGeneration);
     if (aCleanupJS) {
-      EventListenerManager* elm = doc->GetExistingListenerManager();
+      EventListenerManager* elm = aDoc->GetExistingListenerManager();
       if (elm) {
         elm->MarkForCC();
       }
-      nsCOMPtr<EventTarget> win = do_QueryInterface(doc->GetInnerWindow());
+      nsCOMPtr<EventTarget> win = do_QueryInterface(aDoc->GetInnerWindow());
       if (win) {
         elm = win->GetExistingListenerManager();
         if (elm) {
@@ -215,18 +212,27 @@ MarkContentViewer(nsIContentViewer* aViewer, bool aCleanupJS,
     } else if (aPrepareForCC) {
       // Unfortunately we need to still mark user data just before running CC so
       // that it has the right generation.
-      doc->PropertyTable(DOM_USER_DATA)->
+      aDoc->PropertyTable(DOM_USER_DATA)->
         EnumerateAll(MarkUserData, &nsCCUncollectableMarker::sGeneration);
     }
   }
-  if (doc) {
-    if (nsPIDOMWindowInner* inner = doc->GetInnerWindow()) {
-      inner->MarkUncollectableForCCGeneration(nsCCUncollectableMarker::sGeneration);
-    }
-    if (nsPIDOMWindowOuter* outer = doc->GetWindow()) {
-      outer->MarkUncollectableForCCGeneration(nsCCUncollectableMarker::sGeneration);
-    }
+  if (nsPIDOMWindowInner* inner = aDoc->GetInnerWindow()) {
+    inner->MarkUncollectableForCCGeneration(nsCCUncollectableMarker::sGeneration);
+  }
+  if (nsPIDOMWindowOuter* outer = aDoc->GetWindow()) {
+    outer->MarkUncollectableForCCGeneration(nsCCUncollectableMarker::sGeneration);
+  }
+}
+
+void
+MarkContentViewer(nsIContentViewer* aViewer, bool aCleanupJS,
+                  bool aPrepareForCC)
+{
+  if (!aViewer) {
+    return;
   }
+
+  MarkDocument(aViewer->GetDocument(), aCleanupJS, aPrepareForCC);
 }
 
 void MarkDocShell(nsIDocShellTreeItem* aNode, bool aCleanupJS,
diff --git a/dom/base/nsContentList.cpp b/dom/base/nsContentList.cpp
index 43e65777d..c98859ee3 100644
--- a/dom/base/nsContentList.cpp
+++ b/dom/base/nsContentList.cpp
@@ -54,7 +54,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsBaseContentList)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsBaseContentList)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElements)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(nsBaseContentList)
 
diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index 34c7d23b8..3696195dd 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -7597,6 +7597,24 @@ nsContentUtils::IsFileImage(nsIFile* aFile, nsACString& aType)
 }
 
 nsresult
+nsContentUtils::CalculateBufferSizeForImage(const uint32_t& aStride,
+                                            const IntSize& aImageSize,
+                                            const SurfaceFormat& aFormat,
+                                            size_t* aMaxBufferSize,
+                                            size_t* aUsedBufferSize)
+{
+  CheckedInt32 requiredBytes =
+    CheckedInt32(aStride) * CheckedInt32(aImageSize.height);
+  if (!requiredBytes.isValid()) {
+    return NS_ERROR_FAILURE;
+  }
+  *aMaxBufferSize = requiredBytes.value();
+  *aUsedBufferSize = *aMaxBufferSize - aStride + 
+                     (aImageSize.width * BytesPerPixel(aFormat));
+  return NS_OK;
+}
+
+nsresult
 nsContentUtils::DataTransferItemToImage(const IPCDataTransferItem& aItem,
                                         imgIContainer** aContainer)
 {
@@ -7611,6 +7629,22 @@ nsContentUtils::DataTransferItemToImage(const IPCDataTransferItem& aItem,
 
   Shmem data = aItem.data().get_Shmem();
 
+  // Validate shared memory buffer size
+  size_t imageBufLen = 0;
+  size_t maxBufLen = 0;
+  nsresult rv = CalculateBufferSizeForImage(imageDetails.stride(),
+                                            size,
+                                            static_cast<SurfaceFormat>(
+                                              imageDetails.format()),
+                                            &maxBufLen,
+                                            &imageBufLen);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  if (imageBufLen > data.Size<uint8_t>()) {
+    return NS_ERROR_FAILURE;
+  }
+
   RefPtr<DataSourceSurface> image =
       CreateDataSourceSurfaceFromData(size,
                                       static_cast<SurfaceFormat>(imageDetails.format()),
@@ -7950,20 +7984,19 @@ GetSurfaceDataImpl(mozilla::gfx::DataSourceSurface* aSurface,
     return GetSurfaceDataContext::NullValue();
   }
 
-  mozilla::gfx::IntSize size = aSurface->GetSize();
-  mozilla::CheckedInt32 requiredBytes =
-    mozilla::CheckedInt32(map.mStride) * mozilla::CheckedInt32(size.height);
-  if (!requiredBytes.isValid()) {
+  size_t bufLen = 0;
+  size_t maxBufLen = 0;
+  nsresult rv = nsContentUtils::CalculateBufferSizeForImage(map.mStride,
+                                                            aSurface->GetSize(),
+                                                            aSurface->GetFormat(),
+                                                            &maxBufLen,
+                                                            &bufLen);
+  if (NS_FAILED(rv)) {
+    // Release mapped memory
+    aSurface->Unmap();
     return GetSurfaceDataContext::NullValue();
   }
 
-  size_t maxBufLen = requiredBytes.value();
-  mozilla::gfx::SurfaceFormat format = aSurface->GetFormat();
-
-  // Surface data handling is totally nuts. This is the magic one needs to
-  // know to access the data.
-  size_t bufLen = maxBufLen - map.mStride + (size.width * BytesPerPixel(format));
-
   // nsDependentCString wants null-terminated string.
   typename GetSurfaceDataContext::ReturnType surfaceData = aContext.Allocate(maxBufLen + 1);
   if (GetSurfaceDataContext::GetBuffer(surfaceData)) {
@@ -9787,3 +9820,19 @@ nsContentUtils::AttemptLargeAllocationLoad(nsIHttpChannel* aChannel)
 
   return reloadSucceeded;
 }
+
+/* static */ bool
+nsContentUtils::IsLocalRefURL(const nsString& aString)
+{
+  // Find the first non-"C0 controls + space" character.
+  const char16_t* current = aString.get();
+  for (; *current != '\0'; current++) {
+    if (*current > 0x20) {
+      // if the first non-"C0 controls + space" character is '#', this is a
+      // local-ref URL.
+      return *current == '#';
+    }
+  }
+
+  return false;
+}
\ No newline at end of file
diff --git a/dom/base/nsContentUtils.h b/dom/base/nsContentUtils.h
index 9ae6d2155..299a8e859 100644
--- a/dom/base/nsContentUtils.h
+++ b/dom/base/nsContentUtils.h
@@ -13,10 +13,6 @@
 #include <float.h>
 #endif
 
-#if defined(SOLARIS)
-#include <ieeefp.h>
-#endif
-
 #include "js/TypeDecls.h"
 #include "js/Value.h"
 #include "js/RootingAPI.h"
@@ -975,11 +971,17 @@ public:
 
   static bool PrefetchEnabled(nsIDocShell* aDocShell);
 
+  static nsresult CalculateBufferSizeForImage(const uint32_t& aStride,
+                                              const mozilla::gfx::IntSize& aImageSize,
+                                              const mozilla::gfx::SurfaceFormat& aFormat,
+                                              size_t* aMaxBufferSize,
+                                              size_t* aUsedBufferSize);
+
+private:
   /**
    * Fill (with the parameters given) the localized string named |aKey| in
    * properties file |aFile|.
    */
-private:
   static nsresult FormatLocalizedString(PropertiesFile aFile,
                                         const char* aKey,
                                         const char16_t** aParams,
@@ -2730,6 +2732,13 @@ public:
 
   static bool AttemptLargeAllocationLoad(nsIHttpChannel* aChannel);
 
+  /**
+   * Detect whether a string is a (CSS) local-url.
+   * https://drafts.csswg.org/css-values/#local-urls
+   */
+  static bool
+  IsLocalRefURL(const nsString& aString);
+
 private:
   static bool InitializeEventTable();
 
diff --git a/dom/base/nsDOMAttributeMap.cpp b/dom/base/nsDOMAttributeMap.cpp
index 381f267cd..2a90df7e4 100644
--- a/dom/base/nsDOMAttributeMap.cpp
+++ b/dom/base/nsDOMAttributeMap.cpp
@@ -65,7 +65,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMAttributeMap)
   for (auto iter = tmp->mAttributeCache.Iter(); !iter.Done(); iter.Next()) {
     cb.NoteXPCOMChild(static_cast<nsINode*>(iter.Data().get()));
   }
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContent)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
diff --git a/dom/base/nsDOMClassInfo.cpp b/dom/base/nsDOMClassInfo.cpp
index d125e5ad1..1cfde6e1b 100644
--- a/dom/base/nsDOMClassInfo.cpp
+++ b/dom/base/nsDOMClassInfo.cpp
@@ -49,7 +49,6 @@
 #include "nsContentUtils.h"
 #include "nsIDOMGlobalPropertyInitializer.h"
 #include "mozilla/Attributes.h"
-#include "mozilla/Telemetry.h"
 
 // Window scriptable helper includes
 #include "nsScriptNameSpaceManager.h"
@@ -1903,9 +1902,6 @@ LookupComponentsShim(JSContext *cx, JS::Handle<JSObject*> global,
                      nsPIDOMWindowInner *win,
                      JS::MutableHandle<JS::PropertyDescriptor> desc)
 {
-  // Keep track of how often this happens.
-  Telemetry::Accumulate(Telemetry::COMPONENTS_SHIM_ACCESSED_BY_CONTENT, true);
-
   // Warn once.
   nsCOMPtr<nsIDocument> doc = win->GetExtantDoc();
   if (doc) {
diff --git a/dom/base/nsDOMMutationObserver.cpp b/dom/base/nsDOMMutationObserver.cpp
index 024ce5e2e..858a30ce5 100644
--- a/dom/base/nsDOMMutationObserver.cpp
+++ b/dom/base/nsDOMMutationObserver.cpp
@@ -506,7 +506,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsDOMMutationObserver)
   NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMMutationObserver)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mReceivers)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFirstPendingMutation)
diff --git a/dom/base/nsDOMNavigationTiming.cpp b/dom/base/nsDOMNavigationTiming.cpp
index 32ce8a8cb..9c732f2d8 100644
--- a/dom/base/nsDOMNavigationTiming.cpp
+++ b/dom/base/nsDOMNavigationTiming.cpp
@@ -15,7 +15,6 @@
 #include "nsPrintfCString.h"
 #include "mozilla/dom/PerformanceNavigation.h"
 #include "mozilla/TimeStamp.h"
-#include "mozilla/Telemetry.h"
 
 using namespace mozilla;
 
@@ -203,12 +202,6 @@ nsDOMNavigationTiming::NotifyNonBlankPaintForRootContentDocument()
                            mDocShellHasBeenActiveSinceNavigationStart ? "foreground tab" : "this tab was inactive some of the time between navigation start and first non-blank paint");
     PROFILER_MARKER(marker.get());
   }
-
-  if (mDocShellHasBeenActiveSinceNavigationStart) {
-    Telemetry::AccumulateTimeDelta(Telemetry::TIME_TO_NON_BLANK_PAINT_MS,
-                                   mNavigationStart,
-                                   mNonBlankPaint);
-  }
 }
 
 void
diff --git a/dom/base/nsDOMWindowUtils.cpp b/dom/base/nsDOMWindowUtils.cpp
index 291df5f27..2ab5937ac 100644
--- a/dom/base/nsDOMWindowUtils.cpp
+++ b/dom/base/nsDOMWindowUtils.cpp
@@ -4033,8 +4033,6 @@ nsDOMWindowUtils::ForceUseCounterFlush(nsIDOMNode *aNode)
   if (nsCOMPtr<nsIDocument> doc = do_QueryInterface(aNode)) {
     mozilla::css::ImageLoader* loader = doc->StyleImageLoader();
     loader->FlushUseCounters();
-
-    static_cast<nsDocument*>(doc.get())->ReportUseCounters();
     return NS_OK;
   }
 
diff --git a/dom/base/nsDocument.cpp b/dom/base/nsDocument.cpp
index 8acfd901a..a6ed419df 100644
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -25,7 +25,6 @@
 #include "plstr.h"
 #include "mozilla/Sprintf.h"
 
-#include "mozilla/Telemetry.h"
 #include "nsIInterfaceRequestor.h"
 #include "nsIInterfaceRequestorUtils.h"
 #include "nsILoadContext.h"
@@ -1396,63 +1395,6 @@ nsDocument::~nsDocument()
 
   NS_ASSERTION(!mIsShowing, "Destroying a currently-showing document");
 
-  if (IsTopLevelContentDocument()) {
-    //don't report for about: pages
-    if (!IsAboutPage()) {
-      // Record the page load
-      uint32_t pageLoaded = 1;
-      Accumulate(Telemetry::MIXED_CONTENT_UNBLOCK_COUNTER, pageLoaded);
-      // Record the mixed content status of the docshell in Telemetry
-      enum {
-        NO_MIXED_CONTENT = 0, // There is no Mixed Content on the page
-        MIXED_DISPLAY_CONTENT = 1, // The page attempted to load Mixed Display Content
-        MIXED_ACTIVE_CONTENT = 2, // The page attempted to load Mixed Active Content
-        MIXED_DISPLAY_AND_ACTIVE_CONTENT = 3 // The page attempted to load Mixed Display & Mixed Active Content
-      };
-
-      bool mixedActiveLoaded = GetHasMixedActiveContentLoaded();
-      bool mixedActiveBlocked = GetHasMixedActiveContentBlocked();
-
-      bool mixedDisplayLoaded = GetHasMixedDisplayContentLoaded();
-      bool mixedDisplayBlocked = GetHasMixedDisplayContentBlocked();
-
-      bool hasMixedDisplay = (mixedDisplayBlocked || mixedDisplayLoaded);
-      bool hasMixedActive = (mixedActiveBlocked || mixedActiveLoaded);
-
-      uint32_t mixedContentLevel = NO_MIXED_CONTENT;
-      if (hasMixedDisplay && hasMixedActive) {
-        mixedContentLevel = MIXED_DISPLAY_AND_ACTIVE_CONTENT;
-      } else if (hasMixedActive){
-        mixedContentLevel = MIXED_ACTIVE_CONTENT;
-      } else if (hasMixedDisplay) {
-        mixedContentLevel = MIXED_DISPLAY_CONTENT;
-      }
-      Accumulate(Telemetry::MIXED_CONTENT_PAGE_LOAD, mixedContentLevel);
-
-      // record mixed object subrequest telemetry
-      if (mHasMixedContentObjectSubrequest) {
-        /* mixed object subrequest loaded on page*/
-        Accumulate(Telemetry::MIXED_CONTENT_OBJECT_SUBREQUEST, 1);
-      } else {
-        /* no mixed object subrequests loaded on page*/
-        Accumulate(Telemetry::MIXED_CONTENT_OBJECT_SUBREQUEST, 0);
-      }
-
-      // record CSP telemetry on this document
-      if (mHasCSP) {
-        Accumulate(Telemetry::CSP_DOCUMENTS_COUNT, 1);
-      }
-      if (mHasUnsafeInlineCSP) {
-        Accumulate(Telemetry::CSP_UNSAFE_INLINE_DOCUMENTS_COUNT, 1);
-      }
-      if (mHasUnsafeEvalCSP) {
-        Accumulate(Telemetry::CSP_UNSAFE_EVAL_DOCUMENTS_COUNT, 1);
-      }
-    }
-  }
-
-  ReportUseCounters();
-
   mInDestructor = true;
   mInUnlinkOrDeletion = true;
 
@@ -1648,10 +1590,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsDocument)
     NS_IMPL_CYCLE_COLLECTION_DESCRIBE(nsDocument, tmp->mRefCnt.get())
   }
 
-  // Always need to traverse script objects, so do that before we check
-  // if we're uncollectable.
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
-
   if (!nsINode::Traverse(tmp, cb)) {
     return NS_SUCCESS_INTERRUPTED_TRAVERSE;
   }
@@ -1737,8 +1675,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsDocument)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOnDemandBuiltInUASheets)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPreloadingImages)
 
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mIntersectionObservers)
-
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSubImportLinks)
 
   for (uint32_t i = 0; i < tmp->mFrameRequestCallbacks.Length(); ++i) {
@@ -12356,134 +12292,27 @@ nsIDocument::InlineScriptAllowedByCSP()
   return allowsInlineScript;
 }
 
-static bool
-MightBeAboutOrChromeScheme(nsIURI* aURI)
-{
-  MOZ_ASSERT(aURI);
-  bool isAbout = true;
-  bool isChrome = true;
-  aURI->SchemeIs("about", &isAbout);
-  aURI->SchemeIs("chrome", &isChrome);
-  return isAbout || isChrome;
-}
-
-void
-nsDocument::ReportUseCounters()
-{
-  static const bool sDebugUseCounters = false;
-  if (mReportedUseCounters) {
-    return;
-  }
-
-  mReportedUseCounters = true;
-
-  if (Telemetry::HistogramUseCounterCount > 0 &&
-      (IsContentDocument() || IsResourceDoc())) {
-    nsCOMPtr<nsIURI> uri;
-    NodePrincipal()->GetURI(getter_AddRefs(uri));
-    if (!uri || MightBeAboutOrChromeScheme(uri)) {
-      return;
-    }
-
-    if (sDebugUseCounters) {
-      nsCString spec = uri->GetSpecOrDefault();
-
-      // URIs can be rather long for data documents, so truncate them to
-      // some reasonable length.
-      spec.Truncate(std::min(128U, spec.Length()));
-      printf("-- Use counters for %s --\n", spec.get());
-    }
-
-    // We keep separate counts for individual documents and top-level
-    // pages to more accurately track how many web pages might break if
-    // certain features were removed.  Consider the case of a single
-    // HTML document with several SVG images and/or iframes with
-    // sub-documents of their own.  If we maintained a single set of use
-    // counters and all the sub-documents use a particular feature, then
-    // telemetry would indicate that we would be breaking N documents if
-    // that feature were removed.  Whereas with a document/top-level
-    // page split, we can see that N documents would be affected, but
-    // only a single web page would be affected.
-
-    // The difference between the values of these two histograms and the
-    // related use counters below tell us how many pages did *not* use
-    // the feature in question.  For instance, if we see that a given
-    // session has destroyed 30 content documents, but a particular use
-    // counter shows only a count of 5, we can infer that the use
-    // counter was *not* used in 25 of those 30 documents.
-    //
-    // We do things this way, rather than accumulating a boolean flag
-    // for each use counter, to avoid sending histograms for features
-    // that don't get widely used.  Doing things in this fashion means
-    // smaller telemetry payloads and faster processing on the server
-    // side.
-    Telemetry::Accumulate(Telemetry::CONTENT_DOCUMENTS_DESTROYED, 1);
-    if (IsTopLevelContentDocument()) {
-      Telemetry::Accumulate(Telemetry::TOP_LEVEL_CONTENT_DOCUMENTS_DESTROYED, 1);
-    }
-
-    for (int32_t c = 0;
-         c < eUseCounter_Count; ++c) {
-      UseCounter uc = static_cast<UseCounter>(c);
-
-      Telemetry::ID id =
-        static_cast<Telemetry::ID>(Telemetry::HistogramFirstUseCounter + uc * 2);
-      bool value = GetUseCounter(uc);
-
-      if (value) {
-        if (sDebugUseCounters) {
-          const char* name = Telemetry::GetHistogramName(id);
-          if (name) {
-            printf("  %s", name);
-          } else {
-            printf("  #%d", id);
-          }
-          printf(": %d\n", value);
-        }
-
-        Telemetry::Accumulate(id, 1);
-      }
-
-      if (IsTopLevelContentDocument()) {
-        id = static_cast<Telemetry::ID>(Telemetry::HistogramFirstUseCounter +
-                                        uc * 2 + 1);
-        value = GetUseCounter(uc) || GetChildDocumentUseCounter(uc);
-
-        if (value) {
-          if (sDebugUseCounters) {
-            const char* name = Telemetry::GetHistogramName(id);
-            if (name) {
-              printf("  %s", name);
-            } else {
-              printf("  #%d", id);
-            }
-            printf(": %d\n", value);
-          }
-
-          Telemetry::Accumulate(id, 1);
-        }
-      }
-    }
-  }
-}
-
 void
 nsDocument::AddIntersectionObserver(DOMIntersectionObserver* aObserver)
 {
-  NS_ASSERTION(mIntersectionObservers.IndexOf(aObserver) == nsTArray<int>::NoIndex,
-               "Intersection observer already in the list");
-  mIntersectionObservers.AppendElement(aObserver);
+  MOZ_ASSERT(!mIntersectionObservers.Contains(aObserver),
+             "Intersection observer already in the list");
+  mIntersectionObservers.PutEntry(aObserver);
 }
 
 void
 nsDocument::RemoveIntersectionObserver(DOMIntersectionObserver* aObserver)
 {
-  mIntersectionObservers.RemoveElement(aObserver);
+  mIntersectionObservers.RemoveEntry(aObserver);
 }
 
 void
 nsDocument::UpdateIntersectionObservations()
 {
+  if (mIntersectionObservers.IsEmpty()) {
+    return;
+  }
+
   DOMHighResTimeStamp time = 0;
   if (nsPIDOMWindowInner* window = GetInnerWindow()) {
     Performance* perf = window->GetPerformance();
@@ -12491,25 +12320,42 @@ nsDocument::UpdateIntersectionObservations()
       time = perf->Now();
     }
   }
-  for (const auto& observer : mIntersectionObservers) {
-    observer->Update(this, time);
+  nsTArray<RefPtr<DOMIntersectionObserver>> observers(mIntersectionObservers.Count());
+  for (auto iter = mIntersectionObservers.Iter(); !iter.Done(); iter.Next()) {
+    DOMIntersectionObserver* observer = iter.Get()->GetKey();
+    observers.AppendElement(observer);
+  }
+  for (const auto& observer : observers) {
+    if (observer) {
+      observer->Update(this, time);
+    }
   }
 }
 
 void
 nsDocument::ScheduleIntersectionObserverNotification()
 {
+  if (mIntersectionObservers.IsEmpty()) {
+    return;
+  }
+
   nsCOMPtr<nsIRunnable> notification = NewRunnableMethod(this,
     &nsDocument::NotifyIntersectionObservers);
-  NS_DispatchToCurrentThread(notification);
+  NS_DispatchToCurrentThread(notification.forget());
 }
 
 void
 nsDocument::NotifyIntersectionObservers()
 {
-  nsTArray<RefPtr<DOMIntersectionObserver>> observers(mIntersectionObservers);
+  nsTArray<RefPtr<DOMIntersectionObserver>> observers(mIntersectionObservers.Count());
+  for (auto iter = mIntersectionObservers.Iter(); !iter.Done(); iter.Next()) {
+    DOMIntersectionObserver* observer = iter.Get()->GetKey();
+    observers.AppendElement(observer);
+  }
   for (const auto& observer : observers) {
-    observer->Notify();
+    if (observer) {
+      observer->Notify();
+    }
   }
 }
 
diff --git a/dom/base/nsDocument.h b/dom/base/nsDocument.h
index 3725b3c18..95fd57545 100644
--- a/dom/base/nsDocument.h
+++ b/dom/base/nsDocument.h
@@ -774,8 +774,6 @@ public:
 
   virtual nsViewportInfo GetViewportInfo(const mozilla::ScreenIntSize& aDisplaySize) override;
 
-  void ReportUseCounters();
-
   virtual void AddIntersectionObserver(
     mozilla::dom::DOMIntersectionObserver* aObserver) override;
   virtual void RemoveIntersectionObserver(
@@ -1341,8 +1339,9 @@ protected:
   // Array of observers
   nsTObserverArray<nsIDocumentObserver*> mObservers;
 
-  // Array of intersection observers
-  nsTArray<RefPtr<mozilla::dom::DOMIntersectionObserver>> mIntersectionObservers;
+  // Hashtable of intersection observers
+  nsTHashtable<nsPtrHashKey<mozilla::dom::DOMIntersectionObserver>>
+    mIntersectionObservers;
 
   // Tracker for animations that are waiting to start.
   // nullptr until GetOrCreatePendingAnimationTracker is called.
@@ -1448,14 +1447,6 @@ public:
   // 'style-sheet-applicable-state-changed' notification.
   bool mSSApplicableStateNotificationPending:1;
 
-  // Whether we have reported use counters for this document with Telemetry yet.
-  // Normally this is only done at document destruction time, but for image
-  // documents (SVG documents) that are not guaranteed to be destroyed, we
-  // report use counters when the image cache no longer has any imgRequestProxys
-  // pointing to them.  We track whether we ever reported use counters so
-  // that we only report them once for the document.
-  bool mReportedUseCounters:1;
-
   // Whether we have filled our pres shell's style set with the document's
   // additional sheets and sheets from the nsStyleSheetService.
   bool mStyleSetFilled:1;
diff --git a/dom/base/nsFrameLoader.cpp b/dom/base/nsFrameLoader.cpp
index 23067becd..2804f2d4c 100644
--- a/dom/base/nsFrameLoader.cpp
+++ b/dom/base/nsFrameLoader.cpp
@@ -588,6 +588,9 @@ nsFrameLoader::ReallyStartLoadingInternal()
     flags = nsIWebNavigation::LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP |
             nsIWebNavigation::LOAD_FLAGS_DISALLOW_INHERIT_PRINCIPAL;
   }
+  
+  // Notify that this load resulted from attribute changes.
+  loadInfo->SetIsFromProcessingFrameAttributes(true);
 
   // Kick off the load...
   bool tmpState = mNeedsAsyncDestroy;
diff --git a/dom/base/nsFrameMessageManager.cpp b/dom/base/nsFrameMessageManager.cpp
index 6fffd376b..bba4232aa 100644
--- a/dom/base/nsFrameMessageManager.cpp
+++ b/dom/base/nsFrameMessageManager.cpp
@@ -32,7 +32,6 @@
 #include "mozilla/CycleCollectedJSContext.h"
 #include "mozilla/IntentionalCrash.h"
 #include "mozilla/Preferences.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/dom/File.h"
 #include "mozilla/dom/MessagePort.h"
 #include "mozilla/dom/nsIContentParent.h"
@@ -133,7 +132,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsFrameMessageManager)
   }
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mChildManagers)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParentManager)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsFrameMessageManager)
@@ -707,18 +705,9 @@ nsFrameMessageManager::SendRpcMessage(const nsAString& aMessageName,
 static bool
 AllowMessage(size_t aDataLength, const nsAString& aMessageName)
 {
-  static const size_t kMinTelemetryMessageSize = 8192;
-
-  if (aDataLength < kMinTelemetryMessageSize) {
-    return true;
-  }
-
   NS_ConvertUTF16toUTF8 messageName(aMessageName);
   messageName.StripChars("0123456789");
 
-  Telemetry::Accumulate(Telemetry::MESSAGE_MANAGER_MESSAGE_SIZE2, messageName,
-                        aDataLength);
-
   // A message includes more than structured clone data, so subtract
   // 20KB to make it more likely that a message within this bound won't
   // result in an overly large IPC message.
@@ -727,9 +716,6 @@ AllowMessage(size_t aDataLength, const nsAString& aMessageName)
     return true;
   }
 
-  Telemetry::Accumulate(Telemetry::REJECTED_MESSAGE_MANAGER_MESSAGE,
-                        messageName);
-
   return false;
 }
 
@@ -2248,7 +2234,6 @@ nsSameProcessAsyncMessageBase::Init(const nsAString& aMessage,
                                     nsIPrincipal* aPrincipal)
 {
   if (!mData.Copy(aData)) {
-    Telemetry::Accumulate(Telemetry::IPC_SAME_PROCESS_MESSAGE_COPY_OOM_KB, aData.DataLength());
     return NS_ERROR_OUT_OF_MEMORY;
   }
 
diff --git a/dom/base/nsGenericDOMDataNode.cpp b/dom/base/nsGenericDOMDataNode.cpp
index 9688588e0..0ae15e09e 100644
--- a/dom/base/nsGenericDOMDataNode.cpp
+++ b/dom/base/nsGenericDOMDataNode.cpp
@@ -98,10 +98,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsGenericDOMDataNode)
     NS_IMPL_CYCLE_COLLECTION_DESCRIBE(nsGenericDOMDataNode, tmp->mRefCnt.get())
   }
 
-  // Always need to traverse script objects, so do that before we check
-  // if we're uncollectable.
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
-
   if (!nsINode::Traverse(tmp, cb)) {
     return NS_SUCCESS_INTERRUPTED_TRAVERSE;
   }
diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 884ad69ca..ac85e34c0 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -202,16 +202,12 @@
 #include "mozilla/dom/GamepadManager.h"
 #endif
 
-#include "mozilla/dom/VRDisplay.h"
-#include "mozilla/dom/VREventObserver.h"
-
 #include "nsRefreshDriver.h"
 #include "Layers.h"
 
 #include "mozilla/AddonPathService.h"
 #include "mozilla/BasePrincipal.h"
 #include "mozilla/Services.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/dom/Location.h"
 #include "nsHTMLDocument.h"
 #include "nsWrapperCacheInlines.h"
@@ -292,7 +288,6 @@ static bool                 gMouseDown                 = false;
 static bool                 gDragServiceDisabled       = false;
 static FILE                *gDumpFile                  = nullptr;
 static uint32_t             gSerialCounter             = 0;
-static TimeStamp            gLastRecordedRecentTimeouts;
 #define STATISTICS_INTERVAL (30 * PR_MSEC_PER_SEC)
 
 #ifdef DEBUG_jst
@@ -1522,7 +1517,6 @@ nsGlobalWindow::nsGlobalWindow(nsGlobalWindow *aOuterWindow)
     mIsPopupSpam(false),
     mBlockScriptedClosingFlag(false),
     mWasOffline(false),
-    mHasHadSlowScript(false),
     mNotifyIdleObserversIdleOnThaw(false),
     mNotifyIdleObserversActiveOnThaw(false),
     mCreatingInnerWindow(false),
@@ -1533,7 +1527,6 @@ nsGlobalWindow::nsGlobalWindow(nsGlobalWindow *aOuterWindow)
     mShowFocusRingForContent(false),
     mFocusByKeyOccurred(false),
     mHasGamepad(false),
-    mHasVREvents(false),
 #ifdef MOZ_GAMEPAD
     mHasSeenGamepadInput(false),
 #endif
@@ -1759,9 +1752,6 @@ nsGlobalWindow::~nsGlobalWindow()
 
     DropOuterWindowDocs();
   } else {
-    Telemetry::Accumulate(Telemetry::INNERWINDOWS_WITH_MUTATION_LISTENERS,
-                          mMutationBits ? 1 : 0);
-
     if (mListenerManager) {
       mListenerManager->Disconnect();
       mListenerManager = nullptr;
@@ -1971,12 +1961,9 @@ nsGlobalWindow::CleanUp()
   if (IsInnerWindow()) {
     DisableGamepadUpdates();
     mHasGamepad = false;
-    DisableVRUpdates();
-    mHasVREvents = false;
     DisableIdleCallbackRequests();
   } else {
     MOZ_ASSERT(!mHasGamepad);
-    MOZ_ASSERT(!mHasVREvents);
   }
 
   if (mCleanMessageManager) {
@@ -2027,7 +2014,7 @@ nsGlobalWindow::ClearControllers()
 }
 
 void
-nsGlobalWindow::FreeInnerObjects()
+nsGlobalWindow::FreeInnerObjects(bool aForDocumentOpen)
 {
   NS_ASSERTION(IsInnerWindow(), "Don't free inner objects on an outer window");
 
@@ -2086,8 +2073,10 @@ nsGlobalWindow::FreeInnerObjects()
     mDocumentURI = mDoc->GetDocumentURI();
     mDocBaseURI = mDoc->GetDocBaseURI();
 
-    while (mDoc->EventHandlingSuppressed()) {
-      mDoc->UnsuppressEventHandlingAndFireEvents(nsIDocument::eEvents, false);
+    if (!aForDocumentOpen) {
+      while (mDoc->EventHandlingSuppressed()) {
+        mDoc->UnsuppressEventHandlingAndFireEvents(nsIDocument::eEvents, false);
+      }
     }
 
     // Note: we don't have to worry about eAnimationsOnly suppressions because
@@ -2120,9 +2109,6 @@ nsGlobalWindow::FreeInnerObjects()
   mHasGamepad = false;
   mGamepads.Clear();
 #endif
-  DisableVRUpdates();
-  mHasVREvents = false;
-  mVRDisplays.Clear();
 }
 
 //*****************************************************************************
@@ -2277,7 +2263,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsGlobalWindow)
 #endif
 
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCacheStorage)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mVRDisplays)
 
   // Traverse stuff from nsPIDOMWindow
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mChromeEventHandler)
@@ -2299,7 +2284,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsGlobalWindow)
 
   tmp->TraverseHostObjectURIs(cb);
 
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsGlobalWindow)
@@ -2354,7 +2338,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsGlobalWindow)
 #endif
 
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mCacheStorage)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mVRDisplays)
 
   // Unlink stuff from nsPIDOMWindow
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mChromeEventHandler)
@@ -2695,7 +2678,6 @@ TreatAsRemoteXUL(nsIPrincipal* aPrincipal)
 static bool
 EnablePrivilege(JSContext* cx, unsigned argc, JS::Value* vp)
 {
-  Telemetry::Accumulate(Telemetry::ENABLE_PRIVILEGE_EVER_CALLED, true);
   return xpc::EnableUniversalXPConnect(cx);
 }
 
@@ -3005,6 +2987,8 @@ nsGlobalWindow::SetNewDocument(nsIDocument* aDocument,
   nsCOMPtr<WindowStateHolder> wsh = do_QueryInterface(aState);
   NS_ASSERTION(!aState || wsh, "What kind of weird state are you giving me here?");
 
+  bool handleDocumentOpen = false;
+  
   JS::Rooted<JSObject*> newInnerGlobal(cx);
   if (reUseInnerWindow) {
     // We're reusing the current inner window.
@@ -3096,6 +3080,7 @@ nsGlobalWindow::SetNewDocument(nsIDocument* aDocument,
 
     if (currentInner && currentInner->GetWrapperPreserveColor()) {
       if (oldDoc == aDocument) {
+        handleDocumentOpen = true;
         // Move the navigator from the old inner window to the new one since
         // this is a document.write. This is safe from a same-origin point of
         // view because document.write can only be used by the same origin.
@@ -3120,7 +3105,7 @@ nsGlobalWindow::SetNewDocument(nsIDocument* aDocument,
       // Don't free objects on our current inner window if it's going to be
       // held in the bfcache.
       if (!currentInner->IsFrozen()) {
-        currentInner->FreeInnerObjects();
+        currentInner->FreeInnerObjects(handleDocumentOpen);
       }
     }
 
@@ -3389,9 +3374,6 @@ nsGlobalWindow::InnerSetNewDocument(JSContext* aCx, nsIDocument* aDocument)
   mLastOpenedURI = aDocument->GetDocumentURI();
 #endif
 
-  Telemetry::Accumulate(Telemetry::INNERWINDOWS_WITH_MUTATION_LISTENERS,
-                        mMutationBits ? 1 : 0);
-
   // Clear our mutation bitfield.
   mMutationBits = 0;
 }
@@ -6848,8 +6830,6 @@ FullscreenTransitionTask::Run()
       Preferences::GetUint("full-screen-api.transition.timeout", 1000);
     mTimer->Init(observer, timeout, nsITimer::TYPE_ONE_SHOT);
   } else if (stage == eAfterToggle) {
-    Telemetry::AccumulateTimeDelta(Telemetry::FULLSCREEN_TRANSITION_BLACK_MS,
-                                   mFullscreenChangeStartTime);
     mWidget->PerformFullscreenTransition(nsIWidget::eAfterFullscreenToggle,
                                          mDuration.mFadeOut, mTransitionData,
                                          this);
@@ -10513,24 +10493,6 @@ nsGlobalWindow::DisableGamepadUpdates()
 }
 
 void
-nsGlobalWindow::EnableVRUpdates()
-{
-  MOZ_ASSERT(IsInnerWindow());
-
-  if (mHasVREvents && !mVREventObserver) {
-    mVREventObserver = new VREventObserver(this);
-  }
-}
-
-void
-nsGlobalWindow::DisableVRUpdates()
-{
-  MOZ_ASSERT(IsInnerWindow());
-
-  mVREventObserver = nullptr;
-}
-
-void
 nsGlobalWindow::SetChromeEventHandler(EventTarget* aChromeEventHandler)
 {
   MOZ_ASSERT(IsOuterWindow());
@@ -11577,13 +11539,6 @@ nsGlobalWindow::ShowSlowScriptDialog()
   unsigned lineno;
   bool hasFrame = JS::DescribeScriptedCaller(cx, &filename, &lineno);
 
-  // Record the slow script event if we haven't done so already for this inner window
-  // (which represents a particular page to the user).
-  if (!mHasHadSlowScript) {
-    Telemetry::Accumulate(Telemetry::SLOW_SCRIPT_PAGE_COUNT, 1);
-  }
-  mHasHadSlowScript = true;
-
   if (XRE_IsContentProcess() &&
       ProcessHangMonitor::Get()) {
     ProcessHangMonitor::SlowScriptAction action;
@@ -11613,10 +11568,6 @@ nsGlobalWindow::ShowSlowScriptDialog()
     return ContinueSlowScriptAndKeepNotifying;
   }
 
-  // Reached only on non-e10s - once per slow script dialog.
-  // On e10s - we probe once at ProcessHangsMonitor.jsm
-  Telemetry::Accumulate(Telemetry::SLOW_SCRIPT_NOTICE_COUNT, 1);
-
   // Get the nsIPrompt interface from the docshell
   nsCOMPtr<nsIDocShell> ds = GetDocShell();
   NS_ENSURE_TRUE(ds, KillSlowScript);
@@ -12224,7 +12175,6 @@ nsGlobalWindow::Suspend()
       ac->RemoveWindowListener(mEnabledSensors[i], this);
   }
   DisableGamepadUpdates();
-  DisableVRUpdates();
 
   mozilla::dom::workers::SuspendWorkersForWindow(AsInner());
 
@@ -12288,7 +12238,6 @@ nsGlobalWindow::Resume()
       ac->AddWindowListener(mEnabledSensors[i], this);
   }
   EnableGamepadUpdates();
-  EnableVRUpdates();
 
   // Resume all of the AudioContexts for this window
   for (uint32_t i = 0; i < mAudioContexts.Length(); ++i) {
@@ -13445,13 +13394,6 @@ nsGlobalWindow::RunTimeout(Timeout* aTimeout)
     return;
   }
 
-  // Record telemetry information about timers set recently.
-  TimeDuration recordingInterval = TimeDuration::FromMilliseconds(STATISTICS_INTERVAL);
-  if (gLastRecordedRecentTimeouts.IsNull() ||
-      now - gLastRecordedRecentTimeouts > recordingInterval) {
-    gLastRecordedRecentTimeouts = now;
-  }
-
   // Insert a dummy timeout into the list of timeouts between the
   // portion of the list that we are about to process now and those
   // timeouts that will be processed in a future call to
@@ -14044,19 +13986,6 @@ nsGlobalWindow::SetHasGamepadEventListener(bool aHasGamepad/* = true*/)
 void
 nsGlobalWindow::EventListenerAdded(nsIAtom* aType)
 {
-  if (aType == nsGkAtoms::onvrdisplayconnect ||
-      aType == nsGkAtoms::onvrdisplaydisconnect ||
-      aType == nsGkAtoms::onvrdisplaypresentchange) {
-    NotifyVREventListenerAdded();
-  }
-}
-
-void
-nsGlobalWindow::NotifyVREventListenerAdded()
-{
-  MOZ_ASSERT(IsInnerWindow());
-  mHasVREvents = true;
-  EnableVRUpdates();
 }
 
 void
@@ -14201,27 +14130,6 @@ nsGlobalWindow::SyncGamepadState()
 }
 #endif // MOZ_GAMEPAD
 
-bool
-nsGlobalWindow::UpdateVRDisplays(nsTArray<RefPtr<mozilla::dom::VRDisplay>>& aDevices)
-{
-  FORWARD_TO_INNER(UpdateVRDisplays, (aDevices), false);
-
-  VRDisplay::UpdateVRDisplays(mVRDisplays, AsInner());
-  aDevices = mVRDisplays;
-  return true;
-}
-
-void
-nsGlobalWindow::NotifyActiveVRDisplaysChanged()
-{
-  MOZ_ASSERT(IsInnerWindow());
-
-  if (mNavigator) {
-    mNavigator->NotifyActiveVRDisplaysChanged();
-  }
-}
-
-
 // nsGlobalChromeWindow implementation
 
 NS_IMPL_CYCLE_COLLECTION_CLASS(nsGlobalChromeWindow)
diff --git a/dom/base/nsGlobalWindow.h b/dom/base/nsGlobalWindow.h
index 467bc6796..1f420895c 100644
--- a/dom/base/nsGlobalWindow.h
+++ b/dom/base/nsGlobalWindow.h
@@ -135,8 +135,6 @@ class SpeechSynthesis;
 class TabGroup;
 class Timeout;
 class U2F;
-class VRDisplay;
-class VREventObserver;
 class WakeLock;
 #if defined(MOZ_WIDGET_ANDROID)
 class WindowOrientationObserver;
@@ -745,18 +743,6 @@ public:
   void EnableGamepadUpdates();
   void DisableGamepadUpdates();
 
-  // Inner windows only.
-  // Enable/disable updates for VR
-  void EnableVRUpdates();
-  void DisableVRUpdates();
-
-  // Update the VR displays for this window
-  bool UpdateVRDisplays(nsTArray<RefPtr<mozilla::dom::VRDisplay>>& aDisplays);
-
-  // Inner windows only.
-  // Called to inform that the set of active VR displays has changed.
-  void NotifyActiveVRDisplaysChanged();
-
 #define EVENT(name_, id_, type_, struct_)                                     \
   mozilla::dom::EventHandlerNonNull* GetOn##name_()                           \
   {                                                                           \
@@ -1380,7 +1366,7 @@ protected:
     }
   }
 
-  void FreeInnerObjects();
+  void FreeInnerObjects(bool aForDocumentOpen = false);
   nsGlobalWindow *CallerInnerWindow();
 
   // Only to be called on an inner window.
@@ -1794,11 +1780,6 @@ protected:
   // Window offline status. Checked to see if we need to fire offline event
   bool                          mWasOffline : 1;
 
-  // Represents whether the inner window's page has had a slow script notice.
-  // Only used by inner windows; will always be false for outer windows.
-  // This is used to implement Telemetry measures such as SLOW_SCRIPT_PAGE_COUNT.
-  bool                          mHasHadSlowScript : 1;
-
   // Track what sorts of events we need to fire when thawed
   bool                          mNotifyIdleObserversIdleOnThaw : 1;
   bool                          mNotifyIdleObserversActiveOnThaw : 1;
@@ -1832,9 +1813,6 @@ protected:
   // Indicates whether this window wants gamepad input events
   bool                   mHasGamepad : 1;
 
-  // Inner windows only.
-  // Indicates whether this window wants VR events
-  bool                   mHasVREvents : 1;
 #ifdef MOZ_GAMEPAD
   nsCheapSet<nsUint32HashKey> mGamepadIndexSet;
   nsRefPtrHashtable<nsUint32HashKey, mozilla::dom::Gamepad> mGamepads;
@@ -1989,11 +1967,6 @@ protected:
   // This is the CC generation the last time we called CanSkip.
   uint32_t mCanSkipCCGeneration;
 
-  // The VR Displays for this window
-  nsTArray<RefPtr<mozilla::dom::VRDisplay>> mVRDisplays;
-
-  nsAutoPtr<mozilla::dom::VREventObserver> mVREventObserver;
-
   friend class nsDOMScriptableHelper;
   friend class nsDOMWindowUtils;
   friend class mozilla::dom::PostMessageEvent;
diff --git a/dom/base/nsIDocument.h b/dom/base/nsIDocument.h
index 7a73fae71..e5d12ab8f 100644
--- a/dom/base/nsIDocument.h
+++ b/dom/base/nsIDocument.h
@@ -3439,13 +3439,29 @@ nsINode::OwnerDocAsNode() const
   return OwnerDoc();
 }
 
+// ShouldUseXBLScope is defined here as a template so that we can get the faster
+// version of IsInAnonymousSubtree if we're statically known to be an
+// nsIContent.  we could try defining ShouldUseXBLScope separately on nsINode
+// and nsIContent, but then we couldn't put its nsINode implementation here
+// (because this header does not include nsIContent) and we can't put it in
+// nsIContent.h, because the definition of nsIContent::IsInAnonymousSubtree is
+// in nsIContentInlines.h.  And then we get include hell from people trying to
+// call nsINode::GetParentObject but not including nsIContentInlines.h and with
+// no really good way to include it.
+template<typename T>
+inline bool ShouldUseXBLScope(const T* aNode)
+{
+  return aNode->IsInAnonymousSubtree() &&
+         !aNode->IsAnonymousContentInSVGUseSubtree();
+}
+
 inline mozilla::dom::ParentObject
 nsINode::GetParentObject() const
 {
   mozilla::dom::ParentObject p(OwnerDoc());
     // Note that mUseXBLScope is a no-op for chrome, and other places where we
     // don't use XBL scopes.
-  p.mUseXBLScope = IsInAnonymousSubtree() && !IsAnonymousContentInSVGUseSubtree();
+  p.mUseXBLScope = ShouldUseXBLScope(this);
   return p;
 }
 
diff --git a/dom/base/nsINode.cpp b/dom/base/nsINode.cpp
index 09e848710..ca507a5fc 100644
--- a/dom/base/nsINode.cpp
+++ b/dom/base/nsINode.cpp
@@ -27,6 +27,7 @@
 #include "mozilla/dom/Element.h"
 #include "mozilla/dom/Event.h"
 #include "mozilla/dom/ShadowRoot.h"
+#include "mozilla/dom/ScriptSettings.h"
 #include "nsAttrValueOrString.h"
 #include "nsBindingManager.h"
 #include "nsCCUncollectableMarker.h"
@@ -1569,6 +1570,48 @@ CheckForOutdatedParent(nsINode* aParent, nsINode* aNode)
   return NS_OK;
 }
 
+static nsresult
+ReparentWrappersInSubtree(nsIContent* aRoot)
+{
+  MOZ_ASSERT(ShouldUseXBLScope(aRoot));
+  // Start off with no global so we don't fire any error events on failure.
+  AutoJSAPI jsapi;
+  jsapi.Init();
+
+  JSContext* cx = jsapi.cx();
+
+  nsIGlobalObject* docGlobal = aRoot->OwnerDoc()->GetScopeObject();
+  if (NS_WARN_IF(!docGlobal)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  JS::Rooted<JSObject*> rootedGlobal(cx, docGlobal->GetGlobalJSObject());
+  if (NS_WARN_IF(!rootedGlobal)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  rootedGlobal = xpc::GetXBLScope(cx, rootedGlobal);
+
+  nsresult rv;
+  JS::Rooted<JSObject*> reflector(cx);
+  for (nsIContent* cur = aRoot; cur; cur = cur->GetNextNode(aRoot)) {
+    if ((reflector = cur->GetWrapper())) {
+      JSAutoCompartment ac(cx, reflector);
+      rv = ReparentWrapper(cx, reflector);
+      if NS_FAILED(rv) {
+        // We _could_ consider BlastSubtreeToPieces here, but it's not really
+        // needed.  Having some nodes in here accessible to content while others
+        // are not is probably OK.  We just need to fail out of the actual
+        // insertion, so they're not in the DOM.  Returning a failure here will
+        // do that.
+        return rv;
+      }
+    }
+  }
+
+  return NS_OK;
+}
+
 nsresult
 nsINode::doInsertChildAt(nsIContent* aKid, uint32_t aIndex,
                          bool aNotify, nsAttrAndChildArray& aChildArray)
@@ -1606,9 +1649,15 @@ nsINode::doInsertChildAt(nsIContent* aKid, uint32_t aIndex,
   nsIContent* parent =
     IsNodeOfType(eDOCUMENT) ? nullptr : static_cast<nsIContent*>(this);
 
+  bool wasInXBLScope = ShouldUseXBLScope(aKid);
   rv = aKid->BindToTree(doc, parent,
                         parent ? parent->GetBindingParent() : nullptr,
                         true);
+  if (NS_SUCCEEDED(rv) && !wasInXBLScope && ShouldUseXBLScope(aKid)) {
+    MOZ_ASSERT(ShouldUseXBLScope(this),
+               "Why does the kid need to use an XBL scope?");
+    rv = ReparentWrappersInSubtree(aKid);
+  }
   if (NS_FAILED(rv)) {
     if (GetFirstChild() == aKid) {
       mFirstChild = aKid->GetNextSibling();
diff --git a/dom/base/nsJSEnvironment.cpp b/dom/base/nsJSEnvironment.cpp
index 3be1a6d2f..dfd380fc2 100644
--- a/dom/base/nsJSEnvironment.cpp
+++ b/dom/base/nsJSEnvironment.cpp
@@ -70,7 +70,6 @@
 #include "prthread.h"
 
 #include "mozilla/Preferences.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/dom/asmjscache/AsmJSCache.h"
@@ -626,7 +625,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsJSContext)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsJSContext)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mGlobalObjectRef)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsJSContext)
@@ -1357,9 +1355,20 @@ nsJSContext::RunCycleCollectorSlice()
       TimeStamp now = TimeStamp::Now();
 
       // Only run a limited slice if we're within the max running time.
-      if (TimeBetween(gCCStats.mBeginTime, now) < kMaxICCDuration) {
-        float sliceMultiplier = std::max(TimeBetween(gCCStats.mEndSliceTime, now) / (float)kICCIntersliceDelay, 1.0f);
-        budget = js::SliceBudget(js::TimeBudget(kICCSliceBudget * sliceMultiplier));
+      uint32_t runningTime = TimeBetween(gCCStats.mBeginTime, now);
+      if (runningTime < kMaxICCDuration) {
+        // Try to make up for a delay in running this slice.
+        float sliceDelayMultiplier = TimeBetween(gCCStats.mEndSliceTime, now) / (float)kICCIntersliceDelay;
+        float delaySliceBudget = kICCSliceBudget * sliceDelayMultiplier;
+
+        // Increase slice budgets up to |maxLaterSlice| as we approach
+        // half way through the ICC, to avoid large sync CCs.
+        float percentToHalfDone = std::min(2.0f * runningTime / kMaxICCDuration, 1.0f);
+        const float maxLaterSlice = 40.0f;
+        float laterSliceBudget = maxLaterSlice * percentToHalfDone;
+
+        budget = js::SliceBudget(js::TimeBudget(std::max({delaySliceBudget,
+                  laterSliceBudget, (float)kICCSliceBudget})));
       }
     }
   }
@@ -1477,22 +1486,8 @@ nsJSContext::EndCycleCollectionCallback(CycleCollectorResults &aResults)
            NS_GC_DELAY - std::min(ccNowDuration, kMaxICCDuration));
   }
 
-  // Log information about the CC via telemetry, JSON and the console.
-  Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_FINISH_IGC, gCCStats.mAnyLockedOut);
-  Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_SYNC_SKIPPABLE, gCCStats.mRanSyncForgetSkippable);
-  Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_FULL, ccNowDuration);
-  Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_MAX_PAUSE, gCCStats.mMaxSliceTime);
-
-  if (!sLastCCEndTime.IsNull()) {
-    // TimeBetween returns milliseconds, but we want to report seconds.
-    uint32_t timeBetween = TimeBetween(sLastCCEndTime, gCCStats.mBeginTime) / 1000;
-    Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_TIME_BETWEEN, timeBetween);
-  }
   sLastCCEndTime = endCCTimeStamp;
 
-  Telemetry::Accumulate(Telemetry::FORGET_SKIPPABLE_MAX,
-                        sMaxForgetSkippableTime / PR_USEC_PER_MSEC);
-
   PRTime delta = GetCollectionTimeDelta();
 
   uint32_t cleanups = sForgetSkippableBeforeCC ? sForgetSkippableBeforeCC : 1;
@@ -2633,7 +2628,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsJSArgArray)
   tmp->ReleaseJSObjects();
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsJSArgArray)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSArgArray)
diff --git a/dom/base/nsJSTimeoutHandler.cpp b/dom/base/nsJSTimeoutHandler.cpp
index 8736cd1dd..ce5d58385 100644
--- a/dom/base/nsJSTimeoutHandler.cpp
+++ b/dom/base/nsJSTimeoutHandler.cpp
@@ -151,7 +151,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsJSScriptTimeoutHandler)
 
   if (tmp->mFunction) {
     NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFunction)
-    NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   }
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
diff --git a/dom/base/nsMappedAttributes.h b/dom/base/nsMappedAttributes.h
index 9fa7572dd..f00b888b9 100644
--- a/dom/base/nsMappedAttributes.h
+++ b/dom/base/nsMappedAttributes.h
@@ -93,20 +93,13 @@ private:
     nsAttrValue mValue;
   };
 
-  /**
-   * Due to a compiler bug in VisualAge C++ for AIX, we need to return the
-   * address of the first index into mAttrs here, instead of simply
-   * returning mAttrs itself.
-   *
-   * See Bug 231104 for more information.
-   */
   const InternalAttr* Attrs() const
   {
-    return reinterpret_cast<const InternalAttr*>(&(mAttrs[0]));
+    return reinterpret_cast<const InternalAttr*>(mAttrs);
   }
   InternalAttr* Attrs()
   {
-    return reinterpret_cast<InternalAttr*>(&(mAttrs[0]));
+    return reinterpret_cast<InternalAttr*>(mAttrs);
   }
 
   uint16_t mAttrCount;
diff --git a/dom/base/nsNodeInfoManager.cpp b/dom/base/nsNodeInfoManager.cpp
index 66c8c84cf..80f0aa786 100644
--- a/dom/base/nsNodeInfoManager.cpp
+++ b/dom/base/nsNodeInfoManager.cpp
@@ -392,9 +392,6 @@ nsNodeInfoManager::SetDocumentPrincipal(nsIPrincipal *aPrincipal)
   NS_ASSERTION(aPrincipal, "Must have principal by this point!");
   MOZ_DIAGNOSTIC_ASSERT(!nsContentUtils::IsExpandedPrincipal(aPrincipal),
                         "Documents shouldn't have an expanded principal");
-  if (nsContentUtils::IsExpandedPrincipal(aPrincipal)) {
-    Telemetry::Accumulate(Telemetry::DOCUMENT_WITH_EXPANDED_PRINCIPAL, 1);
-  }
 
   mPrincipal = aPrincipal;
 }
diff --git a/dom/base/nsNodeUtils.cpp b/dom/base/nsNodeUtils.cpp
index ecea95dc1..75d408151 100644
--- a/dom/base/nsNodeUtils.cpp
+++ b/dom/base/nsNodeUtils.cpp
@@ -297,6 +297,16 @@ nsNodeUtils::LastRelease(nsINode* aNode)
                                          NodeWillBeDestroyed, (aNode));
     }
 
+    if (aNode->IsElement()) {
+      Element* elem = aNode->AsElement();
+      FragmentOrElement::nsDOMSlots* domSlots =
+        static_cast<FragmentOrElement::nsDOMSlots*>(slots);
+      for (auto iter = domSlots->mRegisteredIntersectionObservers.Iter(); !iter.Done(); iter.Next()) {
+        DOMIntersectionObserver* observer = iter.Key();
+        observer->UnlinkTarget(*elem);
+      }
+    }
+
     delete slots;
     aNode->mSlots = nullptr;
   }
diff --git a/dom/base/nsObjectLoadingContent.cpp b/dom/base/nsObjectLoadingContent.cpp
index 9e9dacf01..c1b732258 100644
--- a/dom/base/nsObjectLoadingContent.cpp
+++ b/dom/base/nsObjectLoadingContent.cpp
@@ -85,7 +85,6 @@
 #include "mozilla/AsyncEventDispatcher.h"
 #include "mozilla/EventDispatcher.h"
 #include "mozilla/EventStates.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/dom/HTMLObjectElementBinding.h"
 #include "mozilla/dom/HTMLSharedObjectElement.h"
 #include "nsChannelClassifier.h"
@@ -1149,7 +1148,6 @@ nsObjectLoadingContent::OnStartRequest(nsIRequest *aRequest,
         NS_LITERAL_STRING(" since it was found on an internal Firefox blocklist.");
       console->LogStringMessage(message.get());
     }
-    Telemetry::Accumulate(Telemetry::PLUGIN_BLOCKED_FOR_STABILITY, 1);
     mContentBlockingEnabled = true;
     return NS_ERROR_FAILURE;
   } else if (status == NS_ERROR_TRACKING_URI) {
@@ -1565,7 +1563,6 @@ nsObjectLoadingContent::MaybeRewriteYoutubeEmbed(nsIURI* aURI, nsIURI* aBaseURI,
   }
 
   if (uri.Find("enablejsapi=1", true, 0, -1) != kNotFound) {
-    Telemetry::Accumulate(Telemetry::YOUTUBE_NONREWRITABLE_EMBED_SEEN, 1);
     return;
   }
 
@@ -1585,11 +1582,6 @@ nsObjectLoadingContent::MaybeRewriteYoutubeEmbed(nsIURI* aURI, nsIURI* aBaseURI,
     }
   }
 
-  // If we've made it this far, we've got a rewritable embed. Log it in
-  // telemetry.
-  Telemetry::Accumulate(Telemetry::YOUTUBE_REWRITABLE_EMBED_SEEN, 1);
-
-  // If we're pref'd off, return after telemetry has been logged.
   if (!Preferences::GetBool(kPrefYoutubeRewrite)) {
     return;
   }
@@ -3800,8 +3792,6 @@ nsObjectLoadingContent::LegacyCall(JSContext* aCx,
     aRv.Throw(NS_ERROR_FAILURE);
     return;
   }
-
-  Telemetry::Accumulate(Telemetry::PLUGIN_CALLED_DIRECTLY, true);
 }
 
 void
diff --git a/dom/base/nsRange.cpp b/dom/base/nsRange.cpp
index 4b4ce7885..d45a2c975 100644
--- a/dom/base/nsRange.cpp
+++ b/dom/base/nsRange.cpp
@@ -351,7 +351,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsRange)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEndParent)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRoot)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSelection)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsRange)
diff --git a/dom/base/nsScriptLoader.cpp b/dom/base/nsScriptLoader.cpp
index a6d20e363..1e23d6c5f 100644
--- a/dom/base/nsScriptLoader.cpp
+++ b/dom/base/nsScriptLoader.cpp
@@ -81,11 +81,19 @@ ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsScriptLoadRequest)
 NS_INTERFACE_MAP_END
 
-NS_IMPL_CYCLE_COLLECTION_0(nsScriptLoadRequest)
-
 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsScriptLoadRequest)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsScriptLoadRequest)
 
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsScriptLoadRequest)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsScriptLoadRequest)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mElement)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsScriptLoadRequest)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
 nsScriptLoadRequest::~nsScriptLoadRequest()
 {
   js_free(mScriptTextBuf);
@@ -345,7 +353,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsModuleScript)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLoader)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsModuleScript)
diff --git a/dom/base/nsWrapperCache.cpp b/dom/base/nsWrapperCache.cpp
index b91d86598..c5993fe7b 100644
--- a/dom/base/nsWrapperCache.cpp
+++ b/dom/base/nsWrapperCache.cpp
@@ -133,7 +133,7 @@ nsWrapperCache::CheckCCWrapperTraversal(void* aScriptObjectHolder,
   // see through the COM layer, so we use a suppression to help it.
   JS::AutoSuppressGCAnalysis suppress;
 
-  aTracer->Traverse(aScriptObjectHolder, callback);
+  aTracer->TraverseNativeAndJS(aScriptObjectHolder, callback);
   MOZ_ASSERT(callback.mFound,
              "Cycle collection participant didn't traverse to preserved "
              "wrapper! This will probably crash.");
diff --git a/dom/base/nsWrapperCache.h b/dom/base/nsWrapperCache.h
index 3c69a7ec4..56cae89ed 100644
--- a/dom/base/nsWrapperCache.h
+++ b/dom/base/nsWrapperCache.h
@@ -331,8 +331,7 @@ private:
    * causes between the native object and the JS object, so it is important that
    * any native object that supports preserving of its wrapper
    * traces/traverses/unlinks the cached JS object (see
-   * NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER,
-   * NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS and
+   * NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER and
    * NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER).
    */
   enum { WRAPPER_BIT_PRESERVED = 1 << 0 };
@@ -383,7 +382,6 @@ NS_DEFINE_STATIC_IID_ACCESSOR(nsWrapperCache, NS_WRAPPERCACHE_IID)
     NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER   \
   NS_IMPL_CYCLE_COLLECTION_UNLINK_END                   \
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(_class)       \
-    NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS    \
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END                 \
   NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(_class)
 
@@ -395,7 +393,6 @@ NS_DEFINE_STATIC_IID_ACCESSOR(nsWrapperCache, NS_WRAPPERCACHE_IID)
   NS_IMPL_CYCLE_COLLECTION_UNLINK_END                      \
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(_class)          \
     NS_IMPL_CYCLE_COLLECTION_TRAVERSE(__VA_ARGS__)         \
-    NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS       \
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END                    \
   NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(_class)
 
diff --git a/dom/bindings/BindingUtils.cpp b/dom/bindings/BindingUtils.cpp
index 323feca52..8d2bdaac6 100644
--- a/dom/bindings/BindingUtils.cpp
+++ b/dom/bindings/BindingUtils.cpp
@@ -2558,7 +2558,7 @@ NonVoidByteStringToJsval(JSContext *cx, const nsACString &str,
 
 
 template<typename T> static void
-NormalizeUSVStringInternal(JSContext* aCx, T& aString)
+NormalizeUSVStringInternal(T& aString)
 {
   char16_t* start = aString.BeginWriting();
   // Must use const here because we can't pass char** to UTF16CharEnumerator as
@@ -2575,15 +2575,15 @@ NormalizeUSVStringInternal(JSContext* aCx, T& aString)
 }
 
 void
-NormalizeUSVString(JSContext* aCx, nsAString& aString)
+NormalizeUSVString(nsAString& aString)
 {
-  NormalizeUSVStringInternal(aCx, aString);
+  NormalizeUSVStringInternal(aString);
 }
 
 void
-NormalizeUSVString(JSContext* aCx, binding_detail::FakeString& aString)
+NormalizeUSVString(binding_detail::FakeString& aString)
 {
-  NormalizeUSVStringInternal(aCx, aString);
+  NormalizeUSVStringInternal(aString);
 }
 
 bool
diff --git a/dom/bindings/BindingUtils.h b/dom/bindings/BindingUtils.h
index 3e58390c9..a3ec70f47 100644
--- a/dom/bindings/BindingUtils.h
+++ b/dom/bindings/BindingUtils.h
@@ -49,7 +49,7 @@ namespace mozilla {
 enum UseCounter : int16_t;
 
 namespace dom {
-template<typename DataType> class MozMap;
+template<typename KeyType, typename ValueType> class Record;
 
 nsresult
 UnwrapArgImpl(JS::Handle<JSObject*> src, const nsIID& iid, void** ppArg);
@@ -515,7 +515,7 @@ class ProtoAndIfaceCache
   {
   public:
     PageTableCache() {
-      memset(&mPages, 0, sizeof(mPages));
+      memset(mPages.begin(), 0, sizeof(mPages));
     }
 
     ~PageTableCache() {
@@ -2127,11 +2127,30 @@ ConvertJSValueToString(JSContext* cx, JS::Handle<JS::Value> v,
   return AssignJSString(cx, result, s);
 }
 
+template<typename T>
+static inline bool
+ConvertJSValueToString(JSContext* cx, JS::Handle<JS::Value> v, T& result)
+{
+  return ConvertJSValueToString(cx, v, eStringify, eStringify, result);
+}
+
 void
-NormalizeUSVString(JSContext* aCx, nsAString& aString);
+NormalizeUSVString(nsAString& aString);
 
 void
-NormalizeUSVString(JSContext* aCx, binding_detail::FakeString& aString);
+NormalizeUSVString(binding_detail::FakeString& aString);
+
+template<typename T>
+static inline bool
+ConvertJSValueToUSVString(JSContext* cx, JS::Handle<JS::Value> v, T& result)
+{
+  if (!ConvertJSValueToString(cx, v, eStringify, eStringify, result)) {
+    return false;
+  }
+
+  NormalizeUSVString(result);
+  return true;
+}
 
 template<typename T>
 inline bool
@@ -2158,6 +2177,13 @@ bool
 ConvertJSValueToByteString(JSContext* cx, JS::Handle<JS::Value> v,
                            bool nullable, nsACString& result);
 
+inline bool
+ConvertJSValueToByteString(JSContext* cx, JS::Handle<JS::Value> v,
+                           nsACString& result)
+{
+  return ConvertJSValueToByteString(cx, v, false, result);
+}
+
 template<typename T>
 void DoTraceSequence(JSTracer* trc, FallibleTArray<T>& seq);
 template<typename T>
@@ -2293,31 +2319,26 @@ public:
   }
 };
 
-template<typename T>
-static void
-TraceMozMapValue(T* aValue, void* aClosure)
-{
-  JSTracer* trc = static_cast<JSTracer*>(aClosure);
-  // Act like it's a one-element sequence to leverage all that infrastructure.
-  SequenceTracer<T>::TraceSequence(trc, aValue, aValue + 1);
-}
-
-template<typename T>
-void TraceMozMap(JSTracer* trc, MozMap<T>& map)
+template<typename K, typename V>
+void TraceRecord(JSTracer* trc, Record<K, V>& record)
 {
-  map.EnumerateValues(TraceMozMapValue<T>, trc);
+  for (auto& entry : record.Entries()) {
+    // Act like it's a one-element sequence to leverage all that infrastructure.
+    SequenceTracer<V>::TraceSequence(trc, &entry.mValue, &entry.mValue + 1);
+  }
 }
 
-// sequence<MozMap>
-template<typename T>
-class SequenceTracer<MozMap<T>, false, false, false>
+// sequence<record>
+template<typename K, typename V>
+class SequenceTracer<Record<K, V>, false, false, false>
 {
   explicit SequenceTracer() = delete; // Should never be instantiated
 
 public:
-  static void TraceSequence(JSTracer* trc, MozMap<T>* seqp, MozMap<T>* end) {
+  static void TraceSequence(JSTracer* trc, Record<K, V>* seqp,
+                            Record<K, V>* end) {
     for (; seqp != end; ++seqp) {
-      seqp->EnumerateValues(TraceMozMapValue<T>, trc);
+      TraceRecord(trc, *seqp);
     }
   }
 };
@@ -2395,51 +2416,51 @@ public:
   SequenceType mSequenceType;
 };
 
-// Rooter class for MozMap; this is what we mostly use in the codegen.
-template<typename T>
-class MOZ_RAII MozMapRooter final : private JS::CustomAutoRooter
+// Rooter class for Record; this is what we mostly use in the codegen.
+template<typename K, typename V>
+class MOZ_RAII RecordRooter final : private JS::CustomAutoRooter
 {
 public:
-  MozMapRooter(JSContext *aCx, MozMap<T>* aMozMap
+  RecordRooter(JSContext *aCx, Record<K, V>* aRecord
                MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
     : JS::CustomAutoRooter(aCx MOZ_GUARD_OBJECT_NOTIFIER_PARAM_TO_PARENT),
-      mMozMap(aMozMap),
-      mMozMapType(eMozMap)
+      mRecord(aRecord),
+      mRecordType(eRecord)
   {
   }
 
-  MozMapRooter(JSContext *aCx, Nullable<MozMap<T>>* aMozMap
+  RecordRooter(JSContext *aCx, Nullable<Record<K, V>>* aRecord
                  MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
     : JS::CustomAutoRooter(aCx MOZ_GUARD_OBJECT_NOTIFIER_PARAM_TO_PARENT),
-      mNullableMozMap(aMozMap),
-      mMozMapType(eNullableMozMap)
+      mNullableRecord(aRecord),
+      mRecordType(eNullableRecord)
   {
   }
 
 private:
-  enum MozMapType {
-    eMozMap,
-    eNullableMozMap
+  enum RecordType {
+    eRecord,
+    eNullableRecord
   };
 
   virtual void trace(JSTracer *trc) override
   {
-    if (mMozMapType == eMozMap) {
-      TraceMozMap(trc, *mMozMap);
+    if (mRecordType == eRecord) {
+      TraceRecord(trc, *mRecord);
     } else {
-      MOZ_ASSERT(mMozMapType == eNullableMozMap);
-      if (!mNullableMozMap->IsNull()) {
-        TraceMozMap(trc, mNullableMozMap->Value());
+      MOZ_ASSERT(mRecordType == eNullableRecord);
+      if (!mNullableRecord->IsNull()) {
+        TraceRecord(trc, mNullableRecord->Value());
       }
     }
   }
 
   union {
-    MozMap<T>* mMozMap;
-    Nullable<MozMap<T>>* mNullableMozMap;
+    Record<K, V>* mRecord;
+    Nullable<Record<K, V>>* mNullableRecord;
   };
 
-  MozMapType mMozMapType;
+  RecordType mRecordType;
 };
 
 template<typename T>
diff --git a/dom/bindings/CallbackObject.cpp b/dom/bindings/CallbackObject.cpp
index 7c7d2c6b4..bb01c804c 100644
--- a/dom/bindings/CallbackObject.cpp
+++ b/dom/bindings/CallbackObject.cpp
@@ -37,7 +37,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CallbackObject)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mIncumbentGlobal)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(CallbackObject)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mIncumbentGlobal)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(CallbackObject)
diff --git a/dom/bindings/Codegen.py b/dom/bindings/Codegen.py
index 7a6668687..74acb5918 100644
--- a/dom/bindings/Codegen.py
+++ b/dom/bindings/Codegen.py
@@ -84,7 +84,7 @@ def idlTypeNeedsCycleCollection(type):
         return True
     elif type.isUnion():
         return any(idlTypeNeedsCycleCollection(t) for t in type.flatMemberTypes)
-    elif type.isMozMap():
+    elif type.isRecord():
         if idlTypeNeedsCycleCollection(type.inner):
             raise TypeError("Cycle collection for type %s is not supported" % type)
         return False
@@ -996,6 +996,8 @@ class CGElseChain(CGThing):
 
 class CGTemplatedType(CGWrapper):
     def __init__(self, templateName, child, isConst=False, isReference=False):
+        if isinstance(child, list):
+            child = CGList(child, ", ")
         const = "const " if isConst else ""
         pre = "%s%s<" % (const, templateName)
         ref = "&" if isReference else ""
@@ -1171,12 +1173,12 @@ class CGHeaders(CGWrapper):
                 declareIncludes.add(filename)
             elif unrolled.isPrimitive():
                 bindingHeaders.add("mozilla/dom/PrimitiveConversions.h")
-            elif unrolled.isMozMap():
+            elif unrolled.isRecord():
                 if dictionary or jsImplementedDescriptors:
-                    declareIncludes.add("mozilla/dom/MozMap.h")
+                    declareIncludes.add("mozilla/dom/Record.h")
                 else:
-                    bindingHeaders.add("mozilla/dom/MozMap.h")
-                # Also add headers for the type the MozMap is
+                    bindingHeaders.add("mozilla/dom/Record.h")
+                # Also add headers for the type the record is
                 # parametrized over, if needed.
                 addHeadersForType((t.inner, dictionary))
 
@@ -1388,8 +1390,8 @@ def UnionTypes(unionTypes, config):
                     # the right header to be able to Release() in our inlined
                     # code.
                     headers.add(CGHeaders.getDeclarationFilename(f.callback))
-                elif f.isMozMap():
-                    headers.add("mozilla/dom/MozMap.h")
+                elif f.isRecord():
+                    headers.add("mozilla/dom/Record.h")
                     # And add headers for the type we're parametrized over
                     addHeadersForType(f.inner)
 
@@ -1448,9 +1450,9 @@ def UnionConversions(unionTypes, config):
                     headers.add(CGHeaders.getDeclarationFilename(f.inner))
                 elif f.isPrimitive():
                     headers.add("mozilla/dom/PrimitiveConversions.h")
-                elif f.isMozMap():
-                    headers.add("mozilla/dom/MozMap.h")
-                    # And the internal type of the MozMap
+                elif f.isRecord():
+                    headers.add("mozilla/dom/Record.h")
+                    # And the internal type of the record
                     addHeadersForType(f.inner)
 
             # We plan to include UnionTypes.h no matter what, so it's
@@ -4290,6 +4292,9 @@ class JSToNativeConversionInfo():
                        for whether we have a JS::Value.  Only used when
                        defaultValue is not None or when True is passed for
                        checkForValue to instantiateJSToNativeConversion.
+                       This expression may not be already-parenthesized, so if
+                       you use it with && or || make sure to put parens
+                       around it.
           ${passedToJSImpl} replaced by an expression that evaluates to a boolean
                             for whether this value is being passed to a JS-
                             implemented interface.
@@ -4355,7 +4360,9 @@ def handleDefaultStringValue(defaultValue, method):
     passing as the second argument of handleDefault; in particular it does not
     end with a ';'
     """
-    assert defaultValue.type.isDOMString() or defaultValue.type.isByteString()
+    assert (defaultValue.type.isDOMString() or
+            defaultValue.type.isUSVString() or
+            defaultValue.type.isByteString())
     return ("static const %(char_t)s data[] = { %(data)s };\n"
             "%(method)s(data, ArrayLength(data) - 1)") % {
                 'char_t': "char" if defaultValue.type.isByteString() else "char16_t",
@@ -4365,6 +4372,17 @@ def handleDefaultStringValue(defaultValue, method):
             }
 
 
+def recordKeyType(recordType):
+    assert recordType.keyType.isString()
+    if recordType.keyType.isByteString():
+        return "nsCString"
+    return "nsString"
+
+
+def recordKeyDeclType(recordType):
+    return CGGeneric(recordKeyType(recordType))
+
+
 # If this function is modified, modify CGNativeMember.getArg and
 # CGNativeMember.getRetvalInfo accordingly.  The latter cares about the decltype
 # and holdertype we end up using, because it needs to be able to return the code
@@ -4559,7 +4577,7 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
             declArgs = "cx"
         else:
             assert (isMember in
-                    ("Sequence", "Variadic", "Dictionary", "OwningUnion", "MozMap"))
+                    ("Sequence", "Variadic", "Dictionary", "OwningUnion", "Record"))
             # We'll get traced by the sequence or dictionary or union tracer
             declType = CGGeneric("JSObject*")
             declArgs = None
@@ -4725,39 +4743,41 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
                                         dealWithOptional=isOptional,
                                         holderArgs=holderArgs)
 
-    if type.isMozMap():
+    if type.isRecord():
         assert not isEnforceRange and not isClamp
         if failureCode is None:
-            notMozMap = ('ThrowErrorMessage(cx, MSG_NOT_OBJECT, "%s");\n'
+            notRecord = ('ThrowErrorMessage(cx, MSG_NOT_OBJECT, "%s");\n'
                          "%s" % (firstCap(sourceDescription), exceptionCode))
         else:
-            notMozMap = failureCode
+            notRecord = failureCode
 
         nullable = type.nullable()
         # Be very careful not to change "type": we need it later
         if nullable:
-            valueType = type.inner.inner
+            recordType = type.inner
         else:
-            valueType = type.inner
+            recordType = type
+        valueType = recordType.inner
 
         valueInfo = getJSToNativeConversionInfo(
-            valueType, descriptorProvider, isMember="MozMap",
+            valueType, descriptorProvider, isMember="Record",
             exceptionCode=exceptionCode, lenientFloatCode=lenientFloatCode,
             isCallbackReturnValue=isCallbackReturnValue,
             sourceDescription="value in %s" % sourceDescription,
             nestingLevel=incrementNestingLevel())
         if valueInfo.dealWithOptional:
-            raise TypeError("Shouldn't have optional things in MozMap")
+            raise TypeError("Shouldn't have optional things in record")
         if valueInfo.holderType is not None:
-            raise TypeError("Shouldn't need holders for MozMap")
+            raise TypeError("Shouldn't need holders for record")
 
-        typeName = CGTemplatedType("MozMap", valueInfo.declType)
-        mozMapType = typeName.define()
+        declType = CGTemplatedType("Record", [recordKeyDeclType(recordType),
+                                              valueInfo.declType])
+        typeName = declType.define()
         if nullable:
-            typeName = CGTemplatedType("Nullable", typeName)
-            mozMapRef = "${declName}.SetValue()"
+            declType = CGTemplatedType("Nullable", declType)
+            recordRef = "${declName}.SetValue()"
         else:
-            mozMapRef = "${declName}"
+            recordRef = "${declName}"
 
         valueConversion = string.Template(valueInfo.template).substitute({
             "val": "temp",
@@ -4770,68 +4790,122 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
             "passedToJSImpl": "${passedToJSImpl}"
         })
 
+        keyType = recordKeyType(recordType)
+        if recordType.keyType.isByteString():
+            keyConversionFunction = "ConvertJSValueToByteString"
+            hashKeyType = "nsCStringHashKey"
+        else:
+            hashKeyType = "nsStringHashKey"
+            if recordType.keyType.isDOMString():
+                keyConversionFunction = "ConvertJSValueToString"
+            else:
+                assert recordType.keyType.isUSVString()
+                keyConversionFunction = "ConvertJSValueToUSVString"
+
         templateBody = fill(
             """
-            ${mozMapType} &mozMap = ${mozMapRef};
+            auto& recordEntries = ${recordRef}.Entries();
 
-            JS::Rooted<JSObject*> mozMapObj(cx, &$${val}.toObject());
-            JS::Rooted<JS::IdVector> ids(cx, JS::IdVector(cx));
-            if (!JS_Enumerate(cx, mozMapObj, &ids)) {
+            JS::Rooted<JSObject*> recordObj(cx, &$${val}.toObject());
+            JS::AutoIdVector ids(cx);
+            if (!js::GetPropertyKeys(cx, recordObj,
+                                     JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS, &ids)) {
+              $*{exceptionCode}
+            }
+            if (!recordEntries.SetCapacity(ids.length(), mozilla::fallible)) {
+              JS_ReportOutOfMemory(cx);
               $*{exceptionCode}
             }
             JS::Rooted<JS::Value> propNameValue(cx);
             JS::Rooted<JS::Value> temp(cx);
             JS::Rooted<jsid> curId(cx);
+            JS::Rooted<JS::Value> idVal(cx);
+            // Use a hashset to keep track of ids seen, to avoid
+            // introducing nasty O(N^2) behavior scanning for them all the
+            // time.  Ideally we'd use a data structure with O(1) lookup
+            // _and_ ordering for the MozMap, but we don't have one lying
+            // around.
+            nsTHashtable<${hashKeyType}> idsSeen;
             for (size_t i = 0; i < ids.length(); ++i) {
-              // Make sure we get the value before converting the name, since
-              // getting the value can trigger GC but our name is a dependent
-              // string.
               curId = ids[i];
-              binding_detail::FakeString propName;
-              bool isSymbol;
-              if (!ConvertIdToString(cx, curId, propName, isSymbol) ||
-                  (!isSymbol && !JS_GetPropertyById(cx, mozMapObj, curId, &temp))) {
+
+              JS::Rooted<JS::PropertyDescriptor> desc(cx);
+              if (!JS_GetOwnPropertyDescriptorById(cx, recordObj, curId,
+                                                   &desc)) {
                 $*{exceptionCode}
               }
-              if (isSymbol) {
+
+              if (!desc.object() /* == undefined in spec terms */ ||
+                  !desc.enumerable()) {
                 continue;
               }
 
-              ${valueType}* slotPtr = mozMap.AddEntry(propName);
-              if (!slotPtr) {
-                JS_ReportOutOfMemory(cx);
+              idVal = js::IdToValue(curId);
+              ${keyType} propName;
+              // This will just throw if idVal is a Symbol, like the spec says
+              // to do.
+              if (!${keyConversionFunction}(cx, idVal, propName)) {
                 $*{exceptionCode}
               }
-              ${valueType}& slot = *slotPtr;
+
+              if (!JS_GetPropertyById(cx, recordObj, curId, &temp)) {
+                $*{exceptionCode}
+              }
+
+              ${typeName}::EntryType* entry;
+              if (idsSeen.Contains(propName)) {
+                // Find the existing entry.
+                auto idx = recordEntries.IndexOf(propName);
+                MOZ_ASSERT(idx != recordEntries.NoIndex,
+                           "Why is it not found?");
+                // Now blow it away to make it look like it was just added
+                // to the array, because it's not obvious that it's
+                // safe to write to its already-initialized mValue via our
+                // normal codegen conversions.  For example, the value
+                // could be a union and this would change its type, but
+                // codegen assumes we won't do that.
+                entry = recordEntries.ReconstructElementAt(idx);
+              } else {
+                // Safe to do an infallible append here, because we did a
+                // SetCapacity above to the right capacity.
+                entry = recordEntries.AppendElement();
+                idsSeen.PutEntry(propName);
+              }
+              entry->mKey = propName;
+              ${valueType}& slot = entry->mValue;
               $*{valueConversion}
             }
             """,
             exceptionCode=exceptionCode,
-            mozMapType=mozMapType,
-            mozMapRef=mozMapRef,
+            recordRef=recordRef,
+            hashKeyType=hashKeyType,
+            keyType=keyType,
+            keyConversionFunction=keyConversionFunction,
+            typeName=typeName,
             valueType=valueInfo.declType.define(),
             valueConversion=valueConversion)
 
         templateBody = wrapObjectTemplate(templateBody, type,
                                           "${declName}.SetNull();\n",
-                                          notMozMap)
+                                          notRecord)
 
-        declType = typeName
         declArgs = None
         holderType = None
         holderArgs = None
-        # MozMap arguments that might contain traceable things need
+        # record arguments that might contain traceable things need
         # to get traced
         if not isMember and isCallbackReturnValue:
             # Go ahead and just convert directly into our actual return value
             declType = CGWrapper(declType, post="&")
             declArgs = "aRetVal"
         elif not isMember and typeNeedsRooting(valueType):
-            holderType = CGTemplatedType("MozMapRooter", valueInfo.declType)
-            # If our MozMap is nullable, this will set the Nullable to be
+            holderType = CGTemplatedType("RecordRooter",
+                                         [recordKeyDeclType(recordType),
+                                          valueInfo.declType])
+            # If our record is nullable, this will set the Nullable to be
             # not-null, but that's ok because we make an explicit SetNull() call
             # on it as needed if our JS value is actually null.
-            holderArgs = "cx, &%s" % mozMapRef
+            holderArgs = "cx, &%s" % recordRef
 
         return JSToNativeConversionInfo(templateBody, declType=declType,
                                         declArgs=declArgs,
@@ -4914,16 +4988,16 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
         else:
             setDictionary = None
 
-        mozMapMemberTypes = filter(lambda t: t.isMozMap(), memberTypes)
-        if len(mozMapMemberTypes) > 0:
-            assert len(mozMapMemberTypes) == 1
-            name = getUnionMemberName(mozMapMemberTypes[0])
-            mozMapObject = CGGeneric(
+        recordMemberTypes = filter(lambda t: t.isRecord(), memberTypes)
+        if len(recordMemberTypes) > 0:
+            assert len(recordMemberTypes) == 1
+            name = getUnionMemberName(recordMemberTypes[0])
+            recordObject = CGGeneric(
                 "done = (failed = !%s.TrySetTo%s(cx, ${val}, tryNext, ${passedToJSImpl})) || !tryNext;\n" %
                 (unionArgumentObj, name))
             names.append(name)
         else:
-            mozMapObject = None
+            recordObject = None
 
         objectMemberTypes = filter(lambda t: t.isObject(), memberTypes)
         if len(objectMemberTypes) > 0:
@@ -4939,10 +5013,10 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
         else:
             object = None
 
-        hasObjectTypes = interfaceObject or sequenceObject or dateObject or callbackObject or object or mozMapObject
+        hasObjectTypes = interfaceObject or sequenceObject or dateObject or callbackObject or object or recordObject
         if hasObjectTypes:
             # "object" is not distinguishable from other types
-            assert not object or not (interfaceObject or sequenceObject or dateObject or callbackObject or mozMapObject)
+            assert not object or not (interfaceObject or sequenceObject or dateObject or callbackObject or recordObject)
             if sequenceObject or dateObject or callbackObject:
                 # An object can be both an sequence object and a callback or
                 # dictionary, but we shouldn't have both in the union's members
@@ -4962,9 +5036,9 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
             if dateObject:
                 templateBody.prepend(CGGeneric("JS::Rooted<JSObject*> argObj(cx, &${val}.toObject());\n"))
 
-            if mozMapObject:
+            if recordObject:
                 templateBody = CGList([templateBody,
-                                       CGIfWrapper(mozMapObject, "!done")])
+                                       CGIfWrapper(recordObject, "!done")])
 
             templateBody = CGIfWrapper(templateBody, "${val}.isObject()")
         else:
@@ -5144,7 +5218,7 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
                 if isinstance(defaultValue, IDLNullValue):
                     extraConditionForNull = "!(${haveValue}) || "
                 else:
-                    extraConditionForNull = "${haveValue} && "
+                    extraConditionForNull = "(${haveValue}) && "
             else:
                 extraConditionForNull = ""
             templateBody = handleNull(templateBody, declLoc,
@@ -5525,7 +5599,7 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
         def getConversionCode(varName):
             normalizeCode = ""
             if type.isUSVString():
-                normalizeCode = "NormalizeUSVString(cx, %s);\n" % varName
+                normalizeCode = "NormalizeUSVString(%s);\n" % varName
 
             conversionCode = fill("""
                 if (!ConvertJSValueToString(cx, $${val}, ${nullBehavior}, ${undefinedBehavior}, ${varName})) {
@@ -5688,7 +5762,7 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
                 haveCallable = "${val}.isObject() && " + haveCallable
             if defaultValue is not None:
                 assert(isinstance(defaultValue, IDLNullValue))
-                haveCallable = "${haveValue} && " + haveCallable
+                haveCallable = "(${haveValue}) && " + haveCallable
             template = (
                 ("if (%s) {\n" % haveCallable) +
                 conversion +
@@ -5700,7 +5774,7 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
                 haveObject = "${val}.isObject()"
                 if defaultValue is not None:
                     assert(isinstance(defaultValue, IDLNullValue))
-                    haveObject = "${haveValue} && " + haveObject
+                    haveObject = "(${haveValue}) && " + haveObject
                 template = CGIfElseWrapper(haveObject,
                                            CGGeneric(conversion),
                                            CGGeneric("${declName} = nullptr;\n")).define()
@@ -5724,7 +5798,7 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
         assert not isEnforceRange and not isClamp
 
         declArgs = None
-        if isMember in ("Variadic", "Sequence", "Dictionary", "MozMap"):
+        if isMember in ("Variadic", "Sequence", "Dictionary", "Record"):
             # Rooting is handled by the sequence and dictionary tracers.
             declType = "JS::Value"
         else:
@@ -5768,8 +5842,9 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
         return handleJSObjectType(type, isMember, failureCode, exceptionCode, sourceDescription)
 
     if type.isDictionary():
-        # There are no nullable dictionaries
-        assert not type.nullable() or isCallbackReturnValue
+        # There are no nullable dictionary arguments or dictionary members
+        assert(not type.nullable() or isCallbackReturnValue or
+               (isMember and isMember != "Dictionary"))
         # All optional dictionaries always have default values, so we
         # should be able to assume not isOptional here.
         assert not isOptional
@@ -6256,7 +6331,7 @@ def getMaybeWrapValueFuncForType(type):
 
 
 sequenceWrapLevel = 0
-mozMapWrapLevel = 0
+recordWrapLevel = 0
 
 
 def getWrapTemplateForType(type, descriptorProvider, result, successCode,
@@ -6361,7 +6436,7 @@ def getWrapTemplateForType(type, descriptorProvider, result, successCode,
     if type is None or type.isVoid():
         return (setUndefined(), True)
 
-    if (type.isSequence() or type.isMozMap()) and type.nullable():
+    if (type.isSequence() or type.isRecord()) and type.nullable():
         # These are both wrapped in Nullable<>
         recTemplate, recInfall = getWrapTemplateForType(type.inner, descriptorProvider,
                                                         "%s.Value()" % result, successCode,
@@ -6434,14 +6509,14 @@ def getWrapTemplateForType(type, descriptorProvider, result, successCode,
 
         return (code, False)
 
-    if type.isMozMap():
-        # Now do non-nullable MozMap.  Our success code is just to break to
+    if type.isRecord():
+        # Now do non-nullable record.  Our success code is just to break to
         # where we define the property on the object.  Note that we bump the
-        # mozMapWrapLevel around this call so that nested MozMap conversions
+        # recordWrapLevel around this call so that nested record conversions
         # will use different temp value names.
-        global mozMapWrapLevel
-        valueName = "mozMapValue%d" % mozMapWrapLevel
-        mozMapWrapLevel += 1
+        global recordWrapLevel
+        valueName = "recordValue%d" % recordWrapLevel
+        recordWrapLevel += 1
         innerTemplate = wrapForType(
             type.inner, descriptorProvider,
             {
@@ -6454,12 +6529,22 @@ def getWrapTemplateForType(type, descriptorProvider, result, successCode,
                 'obj': "returnObj",
                 'typedArraysAreStructs': typedArraysAreStructs
             })
-        mozMapWrapLevel -= 1
+        recordWrapLevel -= 1
+        if type.keyType.isByteString():
+            # There is no length-taking JS_DefineProperty.  So to keep
+            # things sane with embedded nulls, we want to byte-inflate
+            # to an nsAString.  The only byte-inflation function we
+            # have around is AppendASCIItoUTF16, which luckily doesn't
+            # assert anything about the input being ASCII.
+            expandedKeyDecl = "NS_ConvertASCIItoUTF16 expandedKey(entry.mKey);\n"
+            keyName = "expandedKey"
+        else:
+            expandedKeyDecl = ""
+            keyName = "entry.mKey"
+
         code = fill(
             """
 
-            nsTArray<nsString> keys;
-            ${result}.GetKeys(keys);
             JS::Rooted<JSObject*> returnObj(cx, JS_NewPlainObject(cx));
             if (!returnObj) {
               $*{exceptionCode}
@@ -6467,15 +6552,17 @@ def getWrapTemplateForType(type, descriptorProvider, result, successCode,
             // Scope for 'tmp'
             {
               JS::Rooted<JS::Value> tmp(cx);
-              for (size_t idx = 0; idx < keys.Length(); ++idx) {
-                auto& ${valueName} = ${result}.Get(keys[idx]);
+              for (auto& entry : ${result}.Entries()) {
+                auto& ${valueName} = entry.mValue;
                 // Control block to let us common up the JS_DefineUCProperty calls when there
                 // are different ways to succeed at wrapping the value.
                 do {
                   $*{innerTemplate}
                 } while (0);
-                if (!JS_DefineUCProperty(cx, returnObj, keys[idx].get(),
-                                         keys[idx].Length(), tmp,
+                $*{expandedKeyDecl}
+                if (!JS_DefineUCProperty(cx, returnObj,
+                                         ${keyName}.BeginReading(),
+                                         ${keyName}.Length(), tmp,
                                          JSPROP_ENUMERATE)) {
                   $*{exceptionCode}
                 }
@@ -6487,6 +6574,8 @@ def getWrapTemplateForType(type, descriptorProvider, result, successCode,
             exceptionCode=exceptionCode,
             valueName=valueName,
             innerTemplate=innerTemplate,
+            expandedKeyDecl=expandedKeyDecl,
+            keyName=keyName,
             set=setObject("*returnObj"))
 
         return (code, False)
@@ -6770,7 +6859,7 @@ def typeMatchesLambda(type, func):
         return False
     if type.nullable():
         return typeMatchesLambda(type.inner, func)
-    if type.isSequence() or type.isMozMap():
+    if type.isSequence() or type.isRecord():
         return typeMatchesLambda(type.inner, func)
     if type.isUnion():
         return any(typeMatchesLambda(t, func) for t in
@@ -6866,20 +6955,21 @@ def getRetvalDeclarationForType(returnType, descriptorProvider,
         if nullable:
             result = CGTemplatedType("Nullable", result)
         return result, "ref", rooter, None, None
-    if returnType.isMozMap():
+    if returnType.isRecord():
         nullable = returnType.nullable()
         if nullable:
             returnType = returnType.inner
         result, _, _, _, _ = getRetvalDeclarationForType(returnType.inner,
                                                          descriptorProvider,
-                                                         isMember="MozMap")
+                                                         isMember="Record")
         # While we have our inner type, set up our rooter, if needed
         if not isMember and typeNeedsRooting(returnType):
-            rooter = CGGeneric("MozMapRooter<%s> resultRooter(cx, &result);\n" %
-                               result.define())
+            rooter = CGGeneric("RecordRooter<%s> resultRooter(cx, &result);\n" %
+                               ("nsString, " + result.define()))
         else:
             rooter = None
-        result = CGTemplatedType("MozMap", result)
+        result = CGTemplatedType("Record", [recordKeyDeclType(returnType),
+                                            result])
         if nullable:
             result = CGTemplatedType("Nullable", result)
         return result, "ref", rooter, None, None
@@ -6976,7 +7066,7 @@ class CGCallGenerator(CGThing):
                     return True
                 if a.type.isSequence():
                     return True
-                if a.type.isMozMap():
+                if a.type.isRecord():
                     return True
                 # isObject() types are always a JS::Rooted, whether
                 # nullable or not, and it turns out a const JS::Rooted
@@ -7138,7 +7228,7 @@ class MethodNotNewObjectError(Exception):
 # nested sequences we don't use the same variable name to iterate over
 # different sequences.
 sequenceWrapLevel = 0
-mapWrapLevel = 0
+recordWrapLevel = 0
 
 
 def wrapTypeIntoCurrentCompartment(type, value, isMember=True):
@@ -7199,29 +7289,27 @@ def wrapTypeIntoCurrentCompartment(type, value, isMember=True):
             wrapCode = CGIfWrapper(wrapCode, "!%s.IsNull()" % origValue)
         return wrapCode
 
-    if type.isMozMap():
-        origValue = value
+    if type.isRecord():
         origType = type
         if type.nullable():
             type = type.inner
-            value = "%s.Value()" % value
-        global mapWrapLevel
-        key = "mapName%d" % mapWrapLevel
-        mapWrapLevel += 1
+            recordRef = "%s.Value()" % value
+        else:
+            recordRef = value
+        global recordWrapLevel
+        entryRef = "mapEntry%d" % recordWrapLevel
+        recordWrapLevel += 1
         wrapElement = wrapTypeIntoCurrentCompartment(type.inner,
-                                                     "%s.Get(%sKeys[%sIndex])" % (value, key, key))
-        mapWrapLevel -= 1
+                                                     "%s.mValue" % entryRef)
+        recordWrapLevel -= 1
         if not wrapElement:
             return None
         wrapCode = CGWrapper(CGIndenter(wrapElement),
-                             pre=("""
-                                  nsTArray<nsString> %sKeys;
-                                  %s.GetKeys(%sKeys);
-                                  for (uint32_t %sIndex = 0; %sIndex < %sKeys.Length(); ++%sIndex) {
-                                  """ % (key, value, key, key, key, key, key)),
+                             pre=("for (auto& %s : %s.Entries()) {\n" %
+                                  (entryRef, recordRef)),
                              post="}\n")
         if origType.nullable():
-            wrapCode = CGIfWrapper(wrapCode, "!%s.IsNull()" % origValue)
+            wrapCode = CGIfWrapper(wrapCode, "!%s.IsNull()" % value)
         return wrapCode
 
     if type.isDictionary():
@@ -8110,11 +8198,11 @@ class CGMethodCall(CGThing):
                               if distinguishingType(s).isSequence())
 
             # Now append all the overloads that take a dictionary or callback
-            # interface or MozMap.  There should be only one of these!
+            # interface or record.  There should be only one of these!
             genericObjectSigs = [
                 s for s in possibleSignatures
                 if (distinguishingType(s).isDictionary() or
-                    distinguishingType(s).isMozMap() or
+                    distinguishingType(s).isRecord() or
                     distinguishingType(s).isCallbackInterface())]
             assert len(genericObjectSigs) <= 1
             objectSigs.extend(genericObjectSigs)
@@ -9408,7 +9496,7 @@ class CGMemberJITInfo(CGThing):
             return "JSVAL_TYPE_UNDEFINED"
         if t.isSequence():
             return "JSVAL_TYPE_OBJECT"
-        if t.isMozMap():
+        if t.isRecord():
             return "JSVAL_TYPE_OBJECT"
         if t.isGeckoInterface():
             return "JSVAL_TYPE_OBJECT"
@@ -9669,17 +9757,22 @@ def getUnionAccessorSignatureType(type, descriptorProvider):
     # Flat member types have already unwrapped nullables.
     assert not type.nullable()
 
-    if type.isSequence() or type.isMozMap():
+    if type.isSequence() or type.isRecord():
         if type.isSequence():
             wrapperType = "Sequence"
         else:
-            wrapperType = "MozMap"
+            wrapperType = "Record"
         # We don't use the returned template here, so it's OK to just pass no
         # sourceDescription.
         elementInfo = getJSToNativeConversionInfo(type.inner,
                                                   descriptorProvider,
                                                   isMember=wrapperType)
-        return CGTemplatedType(wrapperType, elementInfo.declType,
+        if wrapperType == "Sequence":
+            innerType = elementInfo.declType
+        else:
+            innerType = [recordKeyDeclType(type), elementInfo.declType]
+
+        return CGTemplatedType(wrapperType, innerType,
                                isConst=True, isReference=True)
 
     # Nested unions are unwrapped automatically into our flatMemberTypes.
@@ -10040,10 +10133,10 @@ class CGUnionStruct(CGThing):
                         CGCase("e" + vars["name"],
                                CGGeneric("DoTraceSequence(trc, mValue.m%s.Value());\n" %
                                          vars["name"])))
-                elif t.isMozMap():
+                elif t.isRecord():
                     traceCases.append(
                         CGCase("e" + vars["name"],
-                               CGGeneric("TraceMozMap(trc, mValue.m%s.Value());\n" %
+                               CGGeneric("TraceRecord(trc, mValue.m%s.Value());\n" %
                                          vars["name"])))
                 else:
                     assert t.isSpiderMonkeyInterface()
@@ -13172,8 +13265,8 @@ class CGDictionary(CGThing):
                 trace = CGGeneric('%s.TraceSelf(trc);\n' % memberData)
             if type.nullable():
                 trace = CGIfWrapper(trace, "!%s.IsNull()" % memberNullable)
-        elif type.isMozMap():
-            # If you implement this, add a MozMap<object> to
+        elif type.isRecord():
+            # If you implement this, add a record<DOMString, object> to
             # TestInterfaceJSDictionary and test it in test_bug1036214.html
             # to make sure we end up with the correct security properties.
             assert False
@@ -13583,7 +13676,7 @@ class ForwardDeclarationBuilder:
             # since we don't know which one we might want
             self.addInMozillaDom(CGUnionStruct.unionTypeName(t, False))
             self.addInMozillaDom(CGUnionStruct.unionTypeName(t, True))
-        elif t.isMozMap():
+        elif t.isRecord():
             self.forwardDeclareForType(t.inner, config)
         # Don't need to do anything for void, primitive, string, any or object.
         # There may be some other cases we are missing.
@@ -14089,9 +14182,9 @@ class CGNativeMember(ClassMethod):
             else:
                 returnCode = "aRetVal.SwapElements(${declName});\n"
             return "void", "", returnCode
-        if type.isMozMap():
-            # If we want to handle MozMap-of-MozMap return values, we're
-            # going to need to fix example codegen to not produce MozMap<void>
+        if type.isRecord():
+            # If we want to handle record-of-record return values, we're
+            # going to need to fix example codegen to not produce record<void>
             # for the relevant argument...
             assert not isMember
             # In this case we convert directly into our outparam to start with
@@ -14139,13 +14232,14 @@ class CGNativeMember(ClassMethod):
             if nullable:
                 type = CGTemplatedType("Nullable", type)
             args.append(Argument("%s&" % type.define(), "aRetVal"))
-        elif returnType.isMozMap():
+        elif returnType.isRecord():
             nullable = returnType.nullable()
             if nullable:
                 returnType = returnType.inner
             # And now the actual underlying type
             elementDecl = self.getReturnType(returnType.inner, True)
-            type = CGTemplatedType("MozMap", CGGeneric(elementDecl))
+            type = CGTemplatedType("Record", [recordKeyDeclType(returnType),
+                                              CGGeneric(elementDecl)])
             if nullable:
                 type = CGTemplatedType("Nullable", type)
             args.append(Argument("%s&" % type.define(), "aRetVal"))
@@ -14206,7 +14300,7 @@ class CGNativeMember(ClassMethod):
         Nullable as needed.
 
         isMember can be false or one of the strings "Sequence", "Variadic",
-                 "MozMap"
+                 "Record"
         """
         if type.isSequence():
             nullable = type.nullable()
@@ -14217,13 +14311,13 @@ class CGNativeMember(ClassMethod):
             decl = CGTemplatedType("Sequence", argType)
             return decl.define(), True, True
 
-        if type.isMozMap():
+        if type.isRecord():
             nullable = type.nullable()
             if nullable:
                 type = type.inner
             elementType = type.inner
-            argType = self.getArgType(elementType, False, "MozMap")[0]
-            decl = CGTemplatedType("MozMap", argType)
+            argType = self.getArgType(elementType, False, "Record")[0]
+            decl = CGTemplatedType("Record", [recordKeyDeclType(type), argType])
             return decl.define(), True, True
 
         if type.isUnion():
@@ -14994,7 +15088,6 @@ class CGJSImplClass(CGBindingImplClass):
                 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(${ifaceName})
                   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mImpl)
                   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
-                  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
                 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
                 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(${ifaceName})
                 NS_IMPL_CYCLE_COLLECTING_ADDREF(${ifaceName})
diff --git a/dom/bindings/Configuration.py b/dom/bindings/Configuration.py
index 5c96580a1..f80c19c33 100644
--- a/dom/bindings/Configuration.py
+++ b/dom/bindings/Configuration.py
@@ -115,7 +115,7 @@ class Configuration(DescriptorProvider):
 
         for (t, _) in getAllTypes(self.descriptors, self.dictionaries, self.callbacks):
             while True:
-                if t.isMozMap():
+                if t.isRecord():
                     t = t.inner
                 elif t.unroll() != t:
                     t = t.unroll()
diff --git a/dom/bindings/Exceptions.cpp b/dom/bindings/Exceptions.cpp
index a3f807688..8ace37051 100644
--- a/dom/bindings/Exceptions.cpp
+++ b/dom/bindings/Exceptions.cpp
@@ -305,7 +305,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(JSStackFrame)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCaller)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAsyncCaller)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(JSStackFrame)
   NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mStack)
diff --git a/dom/bindings/MozMap.h b/dom/bindings/MozMap.h
deleted file mode 100644
index 1e920c098..000000000
--- a/dom/bindings/MozMap.h
+++ /dev/null
@@ -1,121 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-/**
- * Class for representing MozMap arguments.  This is an nsTHashtable
- * under the hood, but we don't want to leak that implementation
- * detail.
- */
-
-#ifndef mozilla_dom_MozMap_h
-#define mozilla_dom_MozMap_h
-
-#include "nsTHashtable.h"
-#include "nsHashKeys.h"
-#include "nsStringGlue.h"
-#include "nsTArray.h"
-#include "mozilla/Attributes.h"
-#include "mozilla/Move.h"
-
-namespace mozilla {
-namespace dom {
-
-namespace binding_detail {
-template<typename DataType>
-class MozMapEntry : public nsStringHashKey
-{
-public:
-  explicit MozMapEntry(const nsAString* aKeyTypePointer)
-    : nsStringHashKey(aKeyTypePointer)
-  {
-  }
-
-  // Move constructor so we can do MozMaps of MozMaps.
-  MozMapEntry(MozMapEntry<DataType>&& aOther)
-    : nsStringHashKey(aOther),
-      mData(Move(aOther.mData))
-  {
-  }
-
-  DataType mData;
-};
-
-} // namespace binding_detail
-
-template<typename DataType>
-class MozMap : protected nsTHashtable<binding_detail::MozMapEntry<DataType>>
-{
-public:
-  typedef typename binding_detail::MozMapEntry<DataType> EntryType;
-  typedef nsTHashtable<EntryType> Base;
-  typedef MozMap<DataType> SelfType;
-
-  MozMap()
-  {
-  }
-
-  // Move constructor so we can do MozMap of MozMap.
-  MozMap(SelfType&& aOther) :
-    Base(Move(aOther))
-  {
-  }
-
-  // The return value is only safe to use until an AddEntry call.
-  const DataType& Get(const nsAString& aKey) const
-  {
-    const EntryType* ent = this->GetEntry(aKey);
-    MOZ_ASSERT(ent, "Why are you using a key we didn't claim to have?");
-    return ent->mData;
-  }
-
-  DataType& Get(const nsAString& aKey)
-  {
-    EntryType* ent = this->GetEntry(aKey);
-    MOZ_ASSERT(ent, "Why are you using a key we didn't claim to have?");
-    return ent->mData;
-  }
-
-  // The return value is only safe to use until an AddEntry call.
-  const DataType* GetIfExists(const nsAString& aKey) const
-  {
-    const EntryType* ent = this->GetEntry(aKey);
-    if (!ent) {
-      return nullptr;
-    }
-    return &ent->mData;
-  }
-
-  void GetKeys(nsTArray<nsString>& aKeys) const {
-    for (auto iter = this->ConstIter(); !iter.Done(); iter.Next()) {
-      aKeys.AppendElement(iter.Get()->GetKey());
-    }
-  }
-
-  // XXXbz we expose this generic enumerator for tracing.  Otherwise we'd end up
-  // with a dependency on BindingUtils.h here for the SequenceTracer bits.
-  typedef void (* Enumerator)(DataType* aValue, void* aClosure);
-  void EnumerateValues(Enumerator aEnumerator, void *aClosure)
-  {
-    for (auto iter = this->Iter(); !iter.Done(); iter.Next()) {
-      aEnumerator(&iter.Get()->mData, aClosure);
-    }
-  }
-
-  MOZ_MUST_USE
-  DataType* AddEntry(const nsAString& aKey)
-  {
-    EntryType* ent = this->PutEntry(aKey, fallible);
-    if (!ent) {
-      return nullptr;
-    }
-    return &ent->mData;
-  }
-};
-
-} // namespace dom
-} // namespace mozilla
-
-#endif // mozilla_dom_MozMap_h
diff --git a/dom/bindings/Record.h b/dom/bindings/Record.h
new file mode 100644
index 000000000..d6ab31699
--- /dev/null
+++ b/dom/bindings/Record.h
@@ -0,0 +1,91 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Class for representing record arguments.  Basically an array under the hood.
+ */
+
+#ifndef mozilla_dom_Record_h
+#define mozilla_dom_Record_h
+
+#include "nsTHashtable.h"
+#include "nsHashKeys.h"
+#include "nsStringGlue.h"
+#include "nsTArray.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Move.h"
+
+namespace mozilla {
+namespace dom {
+
+namespace binding_detail {
+template<typename KeyType, typename ValueType>
+class RecordEntry
+{
+public:
+  RecordEntry()
+  {
+  }
+
+  // Move constructor so we can do Records of Records.
+  RecordEntry(RecordEntry<KeyType, ValueType>&& aOther)
+    : mKey(Move(aOther.mKey)),
+      mValue(Move(aOther.mValue))
+  {
+  }
+
+  KeyType mKey;
+  ValueType mValue;
+};
+
+} // namespace binding_detail
+
+template<typename KeyType, typename ValueType>
+class Record
+{
+public:
+  typedef typename binding_detail::RecordEntry<KeyType, ValueType> EntryType;
+  typedef Record<KeyType, ValueType> SelfType;
+
+  Record()
+  {
+  }
+
+  // Move constructor so we can do Record of Record.
+  Record(SelfType&& aOther) :
+    mEntries(Move(aOther.mEntries))
+  {
+  }
+
+  const nsTArray<EntryType>& Entries() const
+  {
+    return mEntries;
+  }
+
+  nsTArray<EntryType>& Entries()
+  {
+    return mEntries;
+  }
+
+private:
+  nsTArray<EntryType> mEntries;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+template<typename K, typename V>
+class nsDefaultComparator<mozilla::dom::binding_detail::RecordEntry<K, V>, K>
+{
+public:
+  bool Equals(const mozilla::dom::binding_detail::RecordEntry<K, V>& aEntry,
+              const K& aKey) const
+  {
+    return aEntry.mKey == aKey;
+  }
+};
+
+#endif // mozilla_dom_Record_h
diff --git a/dom/bindings/SimpleGlobalObject.cpp b/dom/bindings/SimpleGlobalObject.cpp
index 6ac397019..88710f7d9 100644
--- a/dom/bindings/SimpleGlobalObject.cpp
+++ b/dom/bindings/SimpleGlobalObject.cpp
@@ -29,8 +29,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(SimpleGlobalObject)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(SimpleGlobalObject)
-
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   tmp->TraverseHostObjectURIs(cb);
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
diff --git a/dom/bindings/moz.build b/dom/bindings/moz.build
index f1ce9e276..7e1358e9c 100644
--- a/dom/bindings/moz.build
+++ b/dom/bindings/moz.build
@@ -32,10 +32,10 @@ EXPORTS.mozilla.dom += [
     'FakeString.h',
     'IterableIterator.h',
     'JSSlots.h',
-    'MozMap.h',
     'NonRefcountedDOMObject.h',
     'Nullable.h',
     'PrimitiveConversions.h',
+    'Record.h',
     'RootedDictionary.h',
     'SimpleGlobalObject.h',
     'StructuredClone.h',
diff --git a/dom/bindings/parser/WebIDL.py b/dom/bindings/parser/WebIDL.py
index f668d7d62..8c32a8738 100644
--- a/dom/bindings/parser/WebIDL.py
+++ b/dom/bindings/parser/WebIDL.py
@@ -1867,7 +1867,7 @@ class IDLDictionary(IDLObjectWithScope):
 
             if (memberType.nullable() or
                 memberType.isSequence() or
-                memberType.isMozMap()):
+                memberType.isRecord()):
                 return typeContainsDictionary(memberType.inner, dictionary)
 
             if memberType.isDictionary():
@@ -1988,7 +1988,7 @@ class IDLType(IDLObject):
         'callback',
         'union',
         'sequence',
-        'mozmap'
+        'record'
         )
 
     def __init__(self, location, name):
@@ -2038,7 +2038,7 @@ class IDLType(IDLObject):
     def isSequence(self):
         return False
 
-    def isMozMap(self):
+    def isRecord(self):
         return False
 
     def isArrayBuffer(self):
@@ -2263,8 +2263,8 @@ class IDLNullableType(IDLParameterizedType):
     def isSequence(self):
         return self.inner.isSequence()
 
-    def isMozMap(self):
-        return self.inner.isMozMap()
+    def isRecord(self):
+        return self.inner.isRecord()
 
     def isArrayBuffer(self):
         return self.inner.isArrayBuffer()
@@ -2321,8 +2321,10 @@ class IDLNullableType(IDLParameterizedType):
         return self
 
     def isDistinguishableFrom(self, other):
-        if (other.nullable() or (other.isUnion() and other.hasNullableType) or
-            other.isDictionary()):
+        if (other.nullable() or
+            other.isDictionary() or
+            (other.isUnion() and
+             (other.hasNullableType or other.hasDictionaryType()))):
             # Can't tell which type null should become
             return False
         return self.inner.isDistinguishableFrom(other)
@@ -2397,34 +2399,38 @@ class IDLSequenceType(IDLParameterizedType):
         return (other.isPrimitive() or other.isString() or other.isEnum() or
                 other.isDate() or other.isInterface() or
                 other.isDictionary() or
-                other.isCallback() or other.isMozMap())
+                other.isCallback() or other.isRecord())
 
 
-class IDLMozMapType(IDLParameterizedType):
-    def __init__(self, location, parameterType):
-        assert not parameterType.isVoid()
+class IDLRecordType(IDLParameterizedType):
+    def __init__(self, location, keyType, valueType):
+        assert keyType.isString()
+        assert keyType.isComplete()
+        assert not valueType.isVoid()
+
+        IDLParameterizedType.__init__(self, location, valueType.name, valueType)
+        self.keyType = keyType
 
-        IDLParameterizedType.__init__(self, location, parameterType.name, parameterType)
         # Need to set self.name up front if our inner type is already complete,
         # since in that case our .complete() won't be called.
         if self.inner.isComplete():
-            self.name = self.inner.name + "MozMap"
+            self.name = self.keyType.name + self.inner.name + "Record"
 
     def __eq__(self, other):
-        return isinstance(other, IDLMozMapType) and self.inner == other.inner
+        return isinstance(other, IDLRecordType) and self.inner == other.inner
 
     def __str__(self):
-        return self.inner.__str__() + "MozMap"
+        return self.keyType.__str__() + self.inner.__str__() + "Record"
 
-    def isMozMap(self):
+    def isRecord(self):
         return True
 
     def tag(self):
-        return IDLType.Tags.mozmap
+        return IDLType.Tags.record
 
     def complete(self, scope):
         self.inner = self.inner.complete(scope)
-        self.name = self.inner.name + "MozMap"
+        self.name = self.keyType.name + self.inner.name + "Record"
         return self
 
     def unroll(self):
@@ -2614,8 +2620,8 @@ class IDLTypedefType(IDLType):
     def isSequence(self):
         return self.inner.isSequence()
 
-    def isMozMap(self):
-        return self.inner.isMozMap()
+    def isRecord(self):
+        return self.inner.isRecord()
 
     def isDictionary(self):
         return self.inner.isDictionary()
@@ -2798,7 +2804,7 @@ class IDLWrapperType(IDLType):
         if self.isEnum():
             return (other.isPrimitive() or other.isInterface() or other.isObject() or
                     other.isCallback() or other.isDictionary() or
-                    other.isSequence() or other.isMozMap() or other.isDate())
+                    other.isSequence() or other.isRecord() or other.isDate())
         if self.isDictionary() and other.nullable():
             return False
         if (other.isPrimitive() or other.isString() or other.isEnum() or
@@ -2820,7 +2826,7 @@ class IDLWrapperType(IDLType):
                     (self.isNonCallbackInterface() or
                      other.isNonCallbackInterface()))
         if (other.isDictionary() or other.isCallback() or
-            other.isMozMap()):
+            other.isRecord()):
             return self.isNonCallbackInterface()
 
         # Not much else |other| can be
@@ -3030,17 +3036,17 @@ class IDLBuiltinType(IDLType):
             return (other.isNumeric() or other.isString() or other.isEnum() or
                     other.isInterface() or other.isObject() or
                     other.isCallback() or other.isDictionary() or
-                    other.isSequence() or other.isMozMap() or other.isDate())
+                    other.isSequence() or other.isRecord() or other.isDate())
         if self.isNumeric():
             return (other.isBoolean() or other.isString() or other.isEnum() or
                     other.isInterface() or other.isObject() or
                     other.isCallback() or other.isDictionary() or
-                    other.isSequence() or other.isMozMap() or other.isDate())
+                    other.isSequence() or other.isRecord() or other.isDate())
         if self.isString():
             return (other.isPrimitive() or other.isInterface() or
                     other.isObject() or
                     other.isCallback() or other.isDictionary() or
-                    other.isSequence() or other.isMozMap() or other.isDate())
+                    other.isSequence() or other.isRecord() or other.isDate())
         if self.isAny():
             # Can't tell "any" apart from anything
             return False
@@ -3050,7 +3056,7 @@ class IDLBuiltinType(IDLType):
             return (other.isPrimitive() or other.isString() or other.isEnum() or
                     other.isInterface() or other.isCallback() or
                     other.isDictionary() or other.isSequence() or
-                    other.isMozMap())
+                    other.isRecord())
         if self.isVoid():
             return not other.isVoid()
         # Not much else we could be!
@@ -3058,7 +3064,7 @@ class IDLBuiltinType(IDLType):
         # Like interfaces, but we know we're not a callback
         return (other.isPrimitive() or other.isString() or other.isEnum() or
                 other.isCallback() or other.isDictionary() or
-                other.isSequence() or other.isMozMap() or other.isDate() or
+                other.isSequence() or other.isRecord() or other.isDate() or
                 (other.isInterface() and (
                  # ArrayBuffer is distinguishable from everything
                  # that's not an ArrayBuffer or a callback interface
@@ -3843,6 +3849,9 @@ class IDLConst(IDLInterfaceMember):
         if type.isDictionary():
             raise WebIDLError("A constant cannot be of a dictionary type",
                               [self.location])
+        if type.isRecord():
+            raise WebIDLError("A constant cannot be of a record type",
+                              [self.location])
         self.type = type
         self.value = value
 
@@ -3954,8 +3963,8 @@ class IDLAttribute(IDLInterfaceMember):
         if self.type.isSequence() and not self.getExtendedAttribute("Cached"):
             raise WebIDLError("A non-cached attribute cannot be of a sequence "
                               "type", [self.location])
-        if self.type.isMozMap() and not self.getExtendedAttribute("Cached"):
-            raise WebIDLError("A non-cached attribute cannot be of a MozMap "
+        if self.type.isRecord() and not self.getExtendedAttribute("Cached"):
+            raise WebIDLError("A non-cached attribute cannot be of a record "
                               "type", [self.location])
         if self.type.isUnion():
             for f in self.type.unroll().flatMemberTypes:
@@ -3971,11 +3980,11 @@ class IDLAttribute(IDLInterfaceMember):
                                       "one of its member types's member "
                                       "types, and so on) is a sequence "
                                       "type", [self.location, f.location])
-                if f.isMozMap():
+                if f.isRecord():
                     raise WebIDLError("An attribute cannot be of a union "
                                       "type if one of its member types (or "
                                       "one of its member types's member "
-                                      "types, and so on) is a MozMap "
+                                      "types, and so on) is a record "
                                       "type", [self.location, f.location])
         if not self.type.isInterface() and self.getExtendedAttribute("PutForwards"):
             raise WebIDLError("An attribute with [PutForwards] must have an "
@@ -3989,7 +3998,7 @@ class IDLAttribute(IDLInterfaceMember):
         def typeContainsChromeOnlyDictionaryMember(type):
             if (type.nullable() or
                 type.isSequence() or
-                type.isMozMap()):
+                type.isRecord()):
                 return typeContainsChromeOnlyDictionaryMember(type.inner)
 
             if type.isUnion():
@@ -4035,10 +4044,10 @@ class IDLAttribute(IDLInterfaceMember):
                                   [self.location, location])
         if self.getExtendedAttribute("Frozen"):
             if (not self.type.isSequence() and not self.type.isDictionary() and
-                not self.type.isMozMap()):
+                not self.type.isRecord()):
                 raise WebIDLError("[Frozen] is only allowed on "
                                   "sequence-valued, dictionary-valued, and "
-                                  "MozMap-valued attributes",
+                                  "record-valued attributes",
                                   [self.location])
         if not self.type.unroll().isExposedInAllOf(self.exposureSet):
             raise WebIDLError("Attribute returns a type that is not exposed "
@@ -5147,7 +5156,7 @@ class Tokenizer(object):
         "Promise": "PROMISE",
         "required": "REQUIRED",
         "sequence": "SEQUENCE",
-        "MozMap": "MOZMAP",
+        "record": "RECORD",
         "short": "SHORT",
         "unsigned": "UNSIGNED",
         "void": "VOID",
@@ -6276,7 +6285,7 @@ class Parser(Tokenizer):
                   | OCTET
                   | OPTIONAL
                   | SEQUENCE
-                  | MOZMAP
+                  | RECORD
                   | SETTER
                   | SHORT
                   | STATIC
@@ -6355,7 +6364,7 @@ class Parser(Tokenizer):
 
     def p_NonAnyType(self, p):
         """
-            NonAnyType : PrimitiveOrStringType Null
+            NonAnyType : PrimitiveType Null
                        | ARRAYBUFFER Null
                        | SHAREDARRAYBUFFER Null
                        | OBJECT Null
@@ -6371,6 +6380,12 @@ class Parser(Tokenizer):
 
         p[0] = self.handleNullable(type, p[2])
 
+    def p_NonAnyTypeStringType(self, p):
+        """
+            NonAnyType : StringType Null
+        """
+        p[0] = self.handleNullable(p[1], p[2])
+
     def p_NonAnyTypeSequenceType(self, p):
         """
             NonAnyType : SEQUENCE LT Type GT Null
@@ -6391,13 +6406,14 @@ class Parser(Tokenizer):
         type = IDLUnresolvedType(self.getLocation(p, 1), promiseIdent, p[3])
         p[0] = self.handleNullable(type, p[5])
 
-    def p_NonAnyTypeMozMapType(self, p):
+    def p_NonAnyTypeRecordType(self, p):
         """
-            NonAnyType : MOZMAP LT Type GT Null
+            NonAnyType : RECORD LT StringType COMMA Type GT Null
         """
-        innerType = p[3]
-        type = IDLMozMapType(self.getLocation(p, 1), innerType)
-        p[0] = self.handleNullable(type, p[5])
+        keyType = p[3]
+        valueType = p[5]
+        type = IDLRecordType(self.getLocation(p, 1), keyType, valueType)
+        p[0] = self.handleNullable(type, p[7])
 
     def p_NonAnyTypeScopedName(self, p):
         """
@@ -6440,7 +6456,7 @@ class Parser(Tokenizer):
 
     def p_ConstType(self, p):
         """
-            ConstType : PrimitiveOrStringType Null
+            ConstType : PrimitiveType Null
         """
         type = BuiltinTypes[p[1]]
         p[0] = self.handleNullable(type, p[2])
@@ -6454,69 +6470,75 @@ class Parser(Tokenizer):
         type = IDLUnresolvedType(self.getLocation(p, 1), identifier)
         p[0] = self.handleNullable(type, p[2])
 
-    def p_PrimitiveOrStringTypeUint(self, p):
+    def p_PrimitiveTypeUint(self, p):
         """
-            PrimitiveOrStringType : UnsignedIntegerType
+            PrimitiveType : UnsignedIntegerType
         """
         p[0] = p[1]
 
-    def p_PrimitiveOrStringTypeBoolean(self, p):
+    def p_PrimitiveTypeBoolean(self, p):
         """
-            PrimitiveOrStringType : BOOLEAN
+            PrimitiveType : BOOLEAN
         """
         p[0] = IDLBuiltinType.Types.boolean
 
-    def p_PrimitiveOrStringTypeByte(self, p):
+    def p_PrimitiveTypeByte(self, p):
         """
-            PrimitiveOrStringType : BYTE
+            PrimitiveType : BYTE
         """
         p[0] = IDLBuiltinType.Types.byte
 
-    def p_PrimitiveOrStringTypeOctet(self, p):
+    def p_PrimitiveTypeOctet(self, p):
         """
-            PrimitiveOrStringType : OCTET
+            PrimitiveType : OCTET
         """
         p[0] = IDLBuiltinType.Types.octet
 
-    def p_PrimitiveOrStringTypeFloat(self, p):
+    def p_PrimitiveTypeFloat(self, p):
         """
-            PrimitiveOrStringType : FLOAT
+            PrimitiveType : FLOAT
         """
         p[0] = IDLBuiltinType.Types.float
 
-    def p_PrimitiveOrStringTypeUnrestictedFloat(self, p):
+    def p_PrimitiveTypeUnrestictedFloat(self, p):
         """
-            PrimitiveOrStringType : UNRESTRICTED FLOAT
+            PrimitiveType : UNRESTRICTED FLOAT
         """
         p[0] = IDLBuiltinType.Types.unrestricted_float
 
-    def p_PrimitiveOrStringTypeDouble(self, p):
+    def p_PrimitiveTypeDouble(self, p):
         """
-            PrimitiveOrStringType : DOUBLE
+            PrimitiveType : DOUBLE
         """
         p[0] = IDLBuiltinType.Types.double
 
-    def p_PrimitiveOrStringTypeUnrestictedDouble(self, p):
+    def p_PrimitiveTypeUnrestictedDouble(self, p):
         """
-            PrimitiveOrStringType : UNRESTRICTED DOUBLE
+            PrimitiveType : UNRESTRICTED DOUBLE
         """
         p[0] = IDLBuiltinType.Types.unrestricted_double
 
-    def p_PrimitiveOrStringTypeDOMString(self, p):
+    def p_StringType(self, p):
+        """
+            StringType : BuiltinStringType
+        """
+        p[0] = BuiltinTypes[p[1]]
+
+    def p_BuiltinStringTypeDOMString(self, p):
         """
-            PrimitiveOrStringType : DOMSTRING
+            BuiltinStringType : DOMSTRING
         """
         p[0] = IDLBuiltinType.Types.domstring
 
-    def p_PrimitiveOrStringTypeBytestring(self, p):
+    def p_BuiltinStringTypeBytestring(self, p):
         """
-            PrimitiveOrStringType : BYTESTRING
+            BuiltinStringType : BYTESTRING
         """
         p[0] = IDLBuiltinType.Types.bytestring
 
-    def p_PrimitiveOrStringTypeUSVString(self, p):
+    def p_BuiltinStringTypeUSVString(self, p):
         """
-            PrimitiveOrStringType : USVSTRING
+            BuiltinStringType : USVSTRING
         """
         p[0] = IDLBuiltinType.Types.usvstring
 
diff --git a/dom/browser-element/BrowserElementParent.js b/dom/browser-element/BrowserElementParent.js
index 67d05f0ab..8e4475bfa 100644
--- a/dom/browser-element/BrowserElementParent.js
+++ b/dom/browser-element/BrowserElementParent.js
@@ -23,15 +23,6 @@ function debug(msg) {
   //dump("BrowserElementParent - " + msg + "\n");
 }
 
-function getIntPref(prefName, def) {
-  try {
-    return Services.prefs.getIntPref(prefName);
-  }
-  catch(err) {
-    return def;
-  }
-}
-
 function handleWindowEvent(e) {
   if (this._browserElementParents) {
     let beps = ThreadSafeChromeUtils.nondeterministicGetWeakMapKeys(this._browserElementParents);
@@ -856,8 +847,8 @@ BrowserElementParent.prototype = {
    */
   zoom: defineNoReturnMethod(function(zoom) {
     zoom *= 100;
-    zoom = Math.min(getIntPref("zoom.maxPercent", 300), zoom);
-    zoom = Math.max(getIntPref("zoom.minPercent", 50), zoom);
+    zoom = Math.min(Services.prefs.getIntPref("zoom.maxPercent", 300), zoom);
+    zoom = Math.max(Services.prefs.getIntPref("zoom.minPercent", 50), zoom);
     this._sendAsyncMsg('zoom', {zoom: zoom / 100.0});
   }),
 
diff --git a/dom/canvas/CanvasRenderingContext2D.cpp b/dom/canvas/CanvasRenderingContext2D.cpp
index 18af28e9f..4849fda57 100644
--- a/dom/canvas/CanvasRenderingContext2D.cpp
+++ b/dom/canvas/CanvasRenderingContext2D.cpp
@@ -783,6 +783,15 @@ public:
   : mCanvas(aCanvas)
   {}
 
+  void OnShutdown() {
+    if(!mCanvas) {
+      return;
+    }
+    
+    mCanvas = nullptr;
+    nsContentUtils::UnregisterShutdownObserver(this);
+  }
+  
   NS_DECL_ISUPPORTS
   NS_DECL_NSIOBSERVER
 private:
@@ -800,7 +809,7 @@ CanvasShutdownObserver::Observe(nsISupports* aSubject,
 {
   if (mCanvas && strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
     mCanvas->OnShutdown();
-    nsContentUtils::UnregisterShutdownObserver(this);
+    OnShutdown();
   }
 
   return NS_OK;
@@ -1038,7 +1047,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(CanvasRenderingContext2D)
       ImplCycleCollectionTraverse(cb, info.mElement, "Hit region fallback element");
     }
   }
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(CanvasRenderingContext2D)
@@ -1097,6 +1105,7 @@ CanvasRenderingContext2D::CanvasRenderingContext2D(layers::LayersBackend aCompos
   , mIsCapturedFrameInvalid(false)
   , mPathTransformWillUpdate(false)
   , mInvalidateCount(0)
+  , mWriteOnly(false) // == !origin-clean
 {
   sNumLivingContexts++;
 
@@ -1218,7 +1227,7 @@ void
 CanvasRenderingContext2D::RemoveShutdownObserver()
 {
   if (mShutdownObserver) {
-    nsContentUtils::UnregisterShutdownObserver(mShutdownObserver);
+    mShutdownObserver->OnShutdown();
     mShutdownObserver = nullptr;
   }
 }
@@ -2554,7 +2563,8 @@ CanvasRenderingContext2D::CreatePattern(const CanvasImageSource& aSource,
     // nullptr and set CORSUsed to true for passing the security check in
     // CanvasUtils::DoDrawImageSecurityCheck().
     RefPtr<CanvasPattern> pat =
-      new CanvasPattern(this, srcSurf, repeatMode, nullptr, false, true);
+      new CanvasPattern(this, srcSurf, repeatMode, nullptr,
+                        imgBitmap.IsWriteOnly(), true);
 
     return pat.forget();
   }
@@ -4944,6 +4954,10 @@ CanvasRenderingContext2D::DrawImage(const CanvasImageSource& aImage,
       aError.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
       return;
     }
+
+    if (canvas->IsWriteOnly()) {
+      SetWriteOnly();
+    }
   } else if (aImage.IsImageBitmap()) {
     ImageBitmap& imageBitmap = aImage.GetAsImageBitmap();
     srcSurf = imageBitmap.PrepareForDrawTarget(mTarget);
@@ -4952,6 +4966,10 @@ CanvasRenderingContext2D::DrawImage(const CanvasImageSource& aImage,
       return;
     }
 
+    if (imageBitmap.IsWriteOnly()) {
+      SetWriteOnly();
+    }
+
     imgSize = gfx::IntSize(imageBitmap.Width(), imageBitmap.Height());
   }
   else {
@@ -5666,9 +5684,8 @@ CanvasRenderingContext2D::GetImageData(JSContext* aCx, double aSx,
 
   // Check only if we have a canvas element; if we were created with a docshell,
   // then it's special internal use.
-  if (mCanvasElement && mCanvasElement->IsWriteOnly() &&
-      !nsContentUtils::IsCallerChrome())
-  {
+  if (IsWriteOnly() ||
+      (mCanvasElement && mCanvasElement->IsWriteOnly() && !nsContentUtils::IsCallerChrome())) {
     // XXX ERRMSG we need to report an error to developers here! (bug 329026)
     aError.Throw(NS_ERROR_DOM_SECURITY_ERR);
     return nullptr;
@@ -6312,6 +6329,13 @@ CanvasRenderingContext2D::ShouldForceInactiveLayer(LayerManager* aManager)
   return !aManager->CanUseCanvasLayerForSize(GetSize());
 }
 
+void CanvasRenderingContext2D::SetWriteOnly() {
+  mWriteOnly = true;
+  if (mCanvasElement) {
+    mCanvasElement->SetWriteOnly();
+  }
+}
+
 NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(CanvasPath, AddRef)
 NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(CanvasPath, Release)
 
diff --git a/dom/canvas/CanvasRenderingContext2D.h b/dom/canvas/CanvasRenderingContext2D.h
index 848b3ee08..d4f295a03 100644
--- a/dom/canvas/CanvasRenderingContext2D.h
+++ b/dom/canvas/CanvasRenderingContext2D.h
@@ -40,6 +40,7 @@ class SourceSurface;
 namespace dom {
 class HTMLImageElementOrSVGImageElementOrHTMLCanvasElementOrHTMLVideoElementOrImageBitmap;
 typedef HTMLImageElementOrSVGImageElementOrHTMLCanvasElementOrHTMLVideoElementOrImageBitmap CanvasImageSource;
+class ImageBitmap;
 class ImageData;
 class StringOrCanvasGradientOrCanvasPattern;
 class OwningStringOrCanvasGradientOrCanvasPattern;
@@ -1151,6 +1152,17 @@ protected:
 
   friend struct CanvasBidiProcessor;
   friend class CanvasDrawObserver;
+  friend class ImageBitmap;
+
+  // For the origin-clean algorithm (mWriteOnly == !origin-clean)
+  // See https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html
+  void SetWriteOnly();
+
+  bool IsWriteOnly() const {
+    return mWriteOnly;
+  }
+
+  bool mWriteOnly;
 };
 
 } // namespace dom
diff --git a/dom/canvas/CanvasRenderingContextHelper.cpp b/dom/canvas/CanvasRenderingContextHelper.cpp
index 3000e59bd..61317fb51 100644
--- a/dom/canvas/CanvasRenderingContextHelper.cpp
+++ b/dom/canvas/CanvasRenderingContextHelper.cpp
@@ -7,7 +7,6 @@
 #include "ImageBitmapRenderingContext.h"
 #include "ImageEncoder.h"
 #include "mozilla/dom/CanvasRenderingContext2D.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/UniquePtr.h"
 #include "nsContentUtils.h"
 #include "nsDOMJSUtils.h"
@@ -138,13 +137,10 @@ CanvasRenderingContextHelper::CreateContextHelper(CanvasContextType aContextType
     break;
 
   case CanvasContextType::Canvas2D:
-    Telemetry::Accumulate(Telemetry::CANVAS_2D_USED, 1);
     ret = new CanvasRenderingContext2D(aCompositorBackend);
     break;
 
   case CanvasContextType::WebGL1:
-    Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_USED, 1);
-
     ret = WebGL1Context::Create();
     if (!ret)
       return nullptr;
@@ -152,8 +148,6 @@ CanvasRenderingContextHelper::CreateContextHelper(CanvasContextType aContextType
     break;
 
   case CanvasContextType::WebGL2:
-    Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_USED, 1);
-
     ret = WebGL2Context::Create();
     if (!ret)
       return nullptr;
@@ -205,16 +199,8 @@ CanvasRenderingContextHelper::GetContext(JSContext* aCx,
       // See bug 645792 and bug 1215072.
       // We want to throw only if dictionary initialization fails,
       // so only in case aRv has been set to some error value.
-      if (contextType == CanvasContextType::WebGL1)
-        Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_SUCCESS, 0);
-      else if (contextType == CanvasContextType::WebGL2)
-        Telemetry::Accumulate(Telemetry::CANVAS_WEBGL2_SUCCESS, 0);
       return nullptr;
     }
-    if (contextType == CanvasContextType::WebGL1)
-      Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_SUCCESS, 1);
-    else if (contextType == CanvasContextType::WebGL2)
-      Telemetry::Accumulate(Telemetry::CANVAS_WEBGL2_SUCCESS, 1);
   } else {
     // We already have a context of some type.
     if (contextType != mCurrentContextType)
diff --git a/dom/canvas/ImageBitmap.cpp b/dom/canvas/ImageBitmap.cpp
index e45cdfc6f..6efe1b318 100644
--- a/dom/canvas/ImageBitmap.cpp
+++ b/dom/canvas/ImageBitmap.cpp
@@ -351,29 +351,27 @@ CheckSecurityForHTMLElements(const nsLayoutUtils::SurfaceFromElementResult& aRes
  */
 template<class HTMLElementType>
 static already_AddRefed<SourceSurface>
-GetSurfaceFromElement(nsIGlobalObject* aGlobal, HTMLElementType& aElement, ErrorResult& aRv)
+GetSurfaceFromElement(nsIGlobalObject* aGlobal, HTMLElementType& aElement,
+                      bool* aWriteOnly, ErrorResult& aRv)
 {
   nsLayoutUtils::SurfaceFromElementResult res =
     nsLayoutUtils::SurfaceFromElement(&aElement, nsLayoutUtils::SFE_WANT_FIRST_FRAME);
 
-  // check origin-clean
-  if (!CheckSecurityForHTMLElements(res)) {
-    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
-    return nullptr;
-  }
-
   RefPtr<SourceSurface> surface = res.GetSourceSurface();
 
   if (NS_WARN_IF(!surface)) {
-    aRv.Throw(NS_ERROR_NOT_AVAILABLE);
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
     return nullptr;
   }
+  
+  // Check origin-clean and pass back
+  *aWriteOnly = !CheckSecurityForHTMLElements(res);
 
   return surface.forget();
 }
 
 /*
- * The specification doesn't allow to create an ImegeBitmap from a vector image.
+ * The specification doesn't allow to create an ImageBitmap from a vector image.
  * This function is used to check if the given HTMLImageElement contains a
  * raster image.
  */
@@ -398,7 +396,7 @@ HasRasterImage(HTMLImageElement& aImageEl)
 }
 
 ImageBitmap::ImageBitmap(nsIGlobalObject* aGlobal, layers::Image* aData,
-                         bool aIsPremultipliedAlpha /* = true */)
+                         bool aWriteOnly, bool aIsPremultipliedAlpha /* = true */)
   : mParent(aGlobal)
   , mData(aData)
   , mSurface(nullptr)
@@ -406,6 +404,7 @@ ImageBitmap::ImageBitmap(nsIGlobalObject* aGlobal, layers::Image* aData,
   , mPictureRect(0, 0, aData->GetSize().width, aData->GetSize().height)
   , mIsPremultipliedAlpha(aIsPremultipliedAlpha)
   , mIsCroppingAreaOutSideOfSourceImage(false)
+  , mWriteOnly(aWriteOnly)
 {
   MOZ_ASSERT(aData, "aData is null in ImageBitmap constructor.");
 }
@@ -698,6 +697,7 @@ ImageBitmap::ToCloneData() const
   RefPtr<SourceSurface> surface = mData->GetAsSourceSurface();
   result->mSurface = surface->GetDataSurface();
   MOZ_ASSERT(result->mSurface);
+  result->mWriteOnly = mWriteOnly;
 
   return Move(result);
 }
@@ -708,7 +708,7 @@ ImageBitmap::CreateFromCloneData(nsIGlobalObject* aGlobal,
 {
   RefPtr<layers::Image> data = CreateImageFromSurface(aData->mSurface);
 
-  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data,
+  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, aData->mWriteOnly,
                                             aData->mIsPremultipliedAlpha);
 
   ret->mIsCroppingAreaOutSideOfSourceImage =
@@ -724,11 +724,8 @@ ImageBitmap::CreateFromOffscreenCanvas(nsIGlobalObject* aGlobal,
                                        OffscreenCanvas& aOffscreenCanvas,
                                        ErrorResult& aRv)
 {
-  // Check origin-clean.
-  if (aOffscreenCanvas.IsWriteOnly()) {
-    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
-    return nullptr;
-  }
+  // Check origin-clean
+  bool writeOnly = aOffscreenCanvas.IsWriteOnly();
 
   nsLayoutUtils::SurfaceFromElementResult res =
     nsLayoutUtils::SurfaceFromOffscreenCanvas(&aOffscreenCanvas,
@@ -744,7 +741,7 @@ ImageBitmap::CreateFromOffscreenCanvas(nsIGlobalObject* aGlobal,
   RefPtr<layers::Image> data =
     CreateImageFromSurface(surface);
 
-  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data);
+  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, writeOnly);
   return ret.forget();
 }
 
@@ -757,16 +754,19 @@ ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, HTMLImageElement& aImageEl
     aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
     return nullptr;
   }
-
+  
   // Check if the image element is a bitmap (e.g. it's a vector graphic) or not.
   if (!HasRasterImage(aImageEl)) {
     aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
     return nullptr;
   }
 
+  bool writeOnly = true;
+
   // Get the SourceSurface out from the image element and then do security
   // checking.
-  RefPtr<SourceSurface> surface = GetSurfaceFromElement(aGlobal, aImageEl, aRv);
+  RefPtr<SourceSurface> surface = GetSurfaceFromElement(aGlobal, aImageEl,
+                                                        &writeOnly, aRv);
 
   if (NS_WARN_IF(aRv.Failed())) {
     return nullptr;
@@ -780,7 +780,7 @@ ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, HTMLImageElement& aImageEl
     return nullptr;
   }
 
-  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data);
+  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, writeOnly);
 
   // Set the picture rectangle.
   if (ret && aCropRect.isSome()) {
@@ -812,13 +812,13 @@ ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, HTMLVideoElement& aVideoEl
     return nullptr;
   }
 
+  bool writeOnly = true;
+  
   // Check security.
   nsCOMPtr<nsIPrincipal> principal = aVideoEl.GetCurrentVideoPrincipal();
   bool CORSUsed = aVideoEl.GetCORSMode() != CORS_NONE;
-  if (!CheckSecurityForHTMLElements(false, CORSUsed, principal)) {
-    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
-    return nullptr;
-  }
+
+  writeOnly = !CheckSecurityForHTMLElements(false, CORSUsed, principal);
 
   // Create ImageBitmap.
   ImageContainer *container = aVideoEl.GetImageContainer();
@@ -834,7 +834,7 @@ ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, HTMLVideoElement& aVideoEl
     aRv.Throw(NS_ERROR_NOT_AVAILABLE);
     return nullptr;
   }
-  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data);
+  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, writeOnly);
 
   // Set the picture rectangle.
   if (ret && aCropRect.isSome()) {
@@ -856,12 +856,18 @@ ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, HTMLCanvasElement& aCanvas
     return nullptr;
   }
 
-  RefPtr<SourceSurface> surface = GetSurfaceFromElement(aGlobal, aCanvasEl, aRv);
+  bool writeOnly = true;
+  
+  RefPtr<SourceSurface> surface = GetSurfaceFromElement(aGlobal, aCanvasEl, &writeOnly, aRv);
 
   if (NS_WARN_IF(aRv.Failed())) {
     return nullptr;
   }
 
+  if (!writeOnly) {
+    writeOnly = aCanvasEl.IsWriteOnly();
+  }
+
   // Crop the source surface if needed.
   RefPtr<SourceSurface> croppedSurface;
   IntRect cropRect = aCropRect.valueOr(IntRect());
@@ -874,8 +880,7 @@ ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, HTMLCanvasElement& aCanvas
       aCropRect.isSome()) {
     // The _surface_ must be a DataSourceSurface.
     MOZ_ASSERT(surface->GetType() == SurfaceType::DATA,
-               "The snapshot SourceSurface from WebGL rendering contest is not \
-               DataSourceSurface.");
+               "The snapshot SourceSurface from WebGL rendering contest is not DataSourceSurface.");
     RefPtr<DataSourceSurface> dataSurface = surface->GetDataSurface();
     croppedSurface = CropAndCopyDataSourceSurface(dataSurface, cropRect);
     cropRect.MoveTo(0, 0);
@@ -897,7 +902,7 @@ ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, HTMLCanvasElement& aCanvas
     return nullptr;
   }
 
-  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data);
+  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, writeOnly);
 
   // Set the picture rectangle.
   if (ret && aCropRect.isSome()) {
@@ -958,9 +963,12 @@ ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, ImageData& aImageData,
     return nullptr;
   }
 
-  // Create an ImageBimtap.
+  // Create an ImageBitmap.
   // ImageData's underlying data is not alpha-premultiplied.
-  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, false);
+  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal,
+                                            data,
+                                            false /* write-only */,
+                                            false /* alpha-premult */);
 
   // The cropping information has been handled in the CreateImageFromRawData()
   // function.
@@ -975,11 +983,8 @@ ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, ImageData& aImageData,
 ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, CanvasRenderingContext2D& aCanvasCtx,
                             const Maybe<IntRect>& aCropRect, ErrorResult& aRv)
 {
-  // Check origin-clean.
-  if (aCanvasCtx.GetCanvas()->IsWriteOnly()) {
-    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
-    return nullptr;
-  }
+  // Check origin-clean
+  bool writeOnly = aCanvasCtx.GetCanvas()->IsWriteOnly() || aCanvasCtx.IsWriteOnly();
 
   RefPtr<SourceSurface> surface = aCanvasCtx.GetSurfaceSnapshot();
 
@@ -1001,7 +1006,7 @@ ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, CanvasRenderingContext2D&
     return nullptr;
   }
 
-  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data);
+  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, writeOnly);
 
   // Set the picture rectangle.
   if (ret && aCropRect.isSome()) {
@@ -1024,7 +1029,10 @@ ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, ImageBitmap& aImageBitmap,
   }
 
   RefPtr<layers::Image> data = aImageBitmap.mData;
-  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, aImageBitmap.mIsPremultipliedAlpha);
+  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal,
+                                            data,
+                                            aImageBitmap.mWriteOnly,
+                                            aImageBitmap.mIsPremultipliedAlpha);
 
   // Set the picture rectangle.
   if (ret && aCropRect.isSome()) {
@@ -1295,7 +1303,7 @@ private:
     }
 
     // Create ImageBitmap object.
-    RefPtr<ImageBitmap> imageBitmap = new ImageBitmap(mGlobalObject, data);
+    RefPtr<ImageBitmap> imageBitmap = new ImageBitmap(mGlobalObject, data, false /* write-only */);
 
     // Set mIsCroppingAreaOutSideOfSourceImage.
     imageBitmap->SetIsCroppingAreaOutSideOfSourceImage(sourceSize, originalCropRect);
@@ -1391,7 +1399,7 @@ private:
     }
 
     // Create ImageBitmap object.
-    RefPtr<ImageBitmap> imageBitmap = new ImageBitmap(mGlobalObject, data);
+    RefPtr<ImageBitmap> imageBitmap = new ImageBitmap(mGlobalObject, data, false /* write-only */);
 
     // Set mIsCroppingAreaOutSideOfSourceImage.
     imageBitmap->SetIsCroppingAreaOutSideOfSourceImage(sourceSize, originalCropRect);
@@ -1486,14 +1494,19 @@ ImageBitmap::ReadStructuredClone(JSContext* aCx,
   uint32_t picRectHeight_;
   uint32_t isPremultipliedAlpha_;
   uint32_t isCroppingAreaOutSideOfSourceImage_;
+  uint32_t writeOnly;
+  uint32_t dummy;
 
   if (!JS_ReadUint32Pair(aReader, &picRectX_, &picRectY_) ||
       !JS_ReadUint32Pair(aReader, &picRectWidth_, &picRectHeight_) ||
       !JS_ReadUint32Pair(aReader, &isPremultipliedAlpha_,
-                                  &isCroppingAreaOutSideOfSourceImage_)) {
+                                  &isCroppingAreaOutSideOfSourceImage_) ||
+      !JS_ReadUint32Pair(aReader, &writeOnly, &dummy)) {
     return nullptr;
   }
 
+  MOZ_ASSERT(dummy == 0);
+  
   int32_t picRectX = BitwiseCast<int32_t>(picRectX_);
   int32_t picRectY = BitwiseCast<int32_t>(picRectY_);
   int32_t picRectWidth = BitwiseCast<int32_t>(picRectWidth_);
@@ -1512,7 +1525,7 @@ ImageBitmap::ReadStructuredClone(JSContext* aCx,
   {
     RefPtr<layers::Image> img = CreateImageFromSurface(aClonedSurfaces[aIndex]);
     RefPtr<ImageBitmap> imageBitmap =
-      new ImageBitmap(aParent, img, isPremultipliedAlpha_);
+      new ImageBitmap(aParent, img, !!writeOnly, isPremultipliedAlpha_);
 
     imageBitmap->mIsCroppingAreaOutSideOfSourceImage =
       isCroppingAreaOutSideOfSourceImage_;
@@ -1547,6 +1560,7 @@ ImageBitmap::WriteStructuredClone(JSStructuredCloneWriter* aWriter,
   const uint32_t picRectHeight = BitwiseCast<uint32_t>(aImageBitmap->mPictureRect.height);
   const uint32_t isPremultipliedAlpha = aImageBitmap->mIsPremultipliedAlpha ? 1 : 0;
   const uint32_t isCroppingAreaOutSideOfSourceImage = aImageBitmap->mIsCroppingAreaOutSideOfSourceImage ? 1 : 0;
+  const uint32_t isWriteOnly = aImageBitmap->mWriteOnly ? 1 : 0;
 
   // Indexing the cloned surfaces and send the index to the receiver.
   uint32_t index = aClonedSurfaces.Length();
@@ -1555,7 +1569,8 @@ ImageBitmap::WriteStructuredClone(JSStructuredCloneWriter* aWriter,
       NS_WARN_IF(!JS_WriteUint32Pair(aWriter, picRectX, picRectY)) ||
       NS_WARN_IF(!JS_WriteUint32Pair(aWriter, picRectWidth, picRectHeight)) ||
       NS_WARN_IF(!JS_WriteUint32Pair(aWriter, isPremultipliedAlpha,
-                                              isCroppingAreaOutSideOfSourceImage))) {
+                                              isCroppingAreaOutSideOfSourceImage)) ||
+      NS_WARN_IF(!JS_WriteUint32Pair(aWriter, isWriteOnly, 0))) {
     return false;
   }
 
diff --git a/dom/canvas/ImageBitmap.h b/dom/canvas/ImageBitmap.h
index 2119c6bda..25084b6ac 100644
--- a/dom/canvas/ImageBitmap.h
+++ b/dom/canvas/ImageBitmap.h
@@ -65,6 +65,7 @@ struct ImageBitmapCloneData final
   gfx::IntRect mPictureRect;
   bool mIsPremultipliedAlpha;
   bool mIsCroppingAreaOutSideOfSourceImage;
+  bool mWriteOnly;
 };
 
 /*
@@ -161,6 +162,10 @@ public:
   template<typename T>
   friend class MapDataIntoBufferSource;
 
+  bool IsWriteOnly() const {
+    return mWriteOnly;
+  }
+
   // Mozilla Extensions
   ImageBitmapFormat
   FindOptimalFormat(const Optional<Sequence<ImageBitmapFormat>>& aPossibleFormats,
@@ -197,6 +202,7 @@ protected:
    * CreateInternal(from ImageData) method.
    */
   ImageBitmap(nsIGlobalObject* aGlobal, layers::Image* aData,
+              bool aWriteOnly,
               bool aIsPremultipliedAlpha = true);
 
   virtual ~ImageBitmap();
@@ -280,6 +286,12 @@ protected:
    */
   bool mIsCroppingAreaOutSideOfSourceImage;
 
+  /*
+   * Write-Only flag is set to true if this image has been generated from a
+   * cross-origin source. This is the opposite of what is called 'origin-clean'
+   * in the spec.
+   */
+  bool mWriteOnly;
 };
 
 } // namespace dom
diff --git a/dom/canvas/ImageBitmapRenderingContext.cpp b/dom/canvas/ImageBitmapRenderingContext.cpp
index 8f5074554..ad313906a 100644
--- a/dom/canvas/ImageBitmapRenderingContext.cpp
+++ b/dom/canvas/ImageBitmapRenderingContext.cpp
@@ -63,6 +63,11 @@ ImageBitmapRenderingContext::TransferFromImageBitmap(ImageBitmap& aImageBitmap)
   if (!mImage) {
     return;
   }
+  
+  // Check if ImageBitmap is tainted, and if so flag the canvas tainted too.
+  if (aImageBitmap.IsWriteOnly() && mCanvasElement) {
+    mCanvasElement->SetWriteOnly();
+  }
 
   Redraw(gfxRect(0, 0, mWidth, mHeight));
 }
diff --git a/dom/canvas/ImageData.cpp b/dom/canvas/ImageData.cpp
index b201fa279..d24fbca95 100644
--- a/dom/canvas/ImageData.cpp
+++ b/dom/canvas/ImageData.cpp
@@ -29,7 +29,6 @@ NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ImageData)
 NS_IMPL_CYCLE_COLLECTION_TRACE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ImageData)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ImageData)
diff --git a/dom/canvas/WebGL1Context.cpp b/dom/canvas/WebGL1Context.cpp
index c1818a3f9..e82cafbe5 100644
--- a/dom/canvas/WebGL1Context.cpp
+++ b/dom/canvas/WebGL1Context.cpp
@@ -6,7 +6,6 @@
 #include "WebGL1Context.h"
 
 #include "mozilla/dom/WebGLRenderingContextBinding.h"
-#include "mozilla/Telemetry.h"
 #include "WebGLFormats.h"
 
 namespace mozilla {
@@ -43,8 +42,6 @@ WebGL1Context::WrapObject(JSContext* cx, JS::Handle<JSObject*> givenProto)
 nsresult
 NS_NewCanvasRenderingContextWebGL(nsIDOMWebGLRenderingContext** out_result)
 {
-    mozilla::Telemetry::Accumulate(mozilla::Telemetry::CANVAS_WEBGL_USED, 1);
-
     nsIDOMWebGLRenderingContext* ctx = mozilla::WebGL1Context::Create();
 
     NS_ADDREF(*out_result = ctx);
diff --git a/dom/canvas/WebGLContext.cpp b/dom/canvas/WebGLContext.cpp
index 32eed6354..e2e05e5fd 100644
--- a/dom/canvas/WebGLContext.cpp
+++ b/dom/canvas/WebGLContext.cpp
@@ -47,7 +47,6 @@
 #include "nsSVGEffects.h"
 #include "prenv.h"
 #include "ScopedGLHelpers.h"
-#include "VRManagerChild.h"
 #include "mozilla/layers/TextureClientSharedSurface.h"
 
 // Local
@@ -825,10 +824,6 @@ NS_IMETHODIMP
 WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
 {
     if (signedWidth < 0 || signedHeight < 0) {
-        if (!gl) {
-            Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_FAILURE_ID,
-                                  NS_LITERAL_CSTRING("FEATURE_FAILURE_WEBGL_SIZE"));
-        }
         GenerateWarning("Canvas size is too large (seems like a negative value wrapped)");
         return NS_ERROR_OUT_OF_MEMORY;
     }
@@ -884,12 +879,6 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
         return NS_OK;
     }
 
-    nsCString failureId = NS_LITERAL_CSTRING("FEATURE_FAILURE_WEBGL_UNKOWN");
-    auto autoTelemetry = mozilla::MakeScopeExit([&] {
-        Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_FAILURE_ID,
-                              failureId);
-    });
-
     // End of early return cases.
     // At this point we know that we're not just resizing an existing context,
     // we are initializing a new context.
@@ -911,7 +900,6 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
     // resource handles created from older context generations.
     if (!(mGeneration + 1).isValid()) {
         // exit without changing the value of mGeneration
-        failureId = NS_LITERAL_CSTRING("FEATURE_FAILURE_WEBGL_TOO_MANY");
         const nsLiteralCString text("Too many WebGL contexts created this run.");
         ThrowEvent_WebGLContextCreationError(text);
         return NS_ERROR_FAILURE;
@@ -928,11 +916,6 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
     disabled |= gfxPlatform::InSafeMode();
 
     if (disabled) {
-        if (gfxPlatform::InSafeMode()) {
-            failureId = NS_LITERAL_CSTRING("FEATURE_FAILURE_WEBGL_SAFEMODE");
-        } else {
-            failureId = NS_LITERAL_CSTRING("FEATURE_FAILURE_WEBGL_DISABLED");
-        }
         const nsLiteralCString text("WebGL is currently disabled.");
         ThrowEvent_WebGLContextCreationError(text);
         return NS_ERROR_FAILURE;
@@ -945,7 +928,6 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
     if (mOptions.failIfMajorPerformanceCaveat) {
         nsCOMPtr<nsIGfxInfo> gfxInfo = services::GetGfxInfo();
         if (!HasAcceleratedLayers(gfxInfo)) {
-            failureId = NS_LITERAL_CSTRING("FEATURE_FAILURE_WEBGL_PERF_CAVEAT");
             const nsLiteralCString text("failIfMajorPerformanceCaveat: Compositor is not"
                                         " hardware-accelerated.");
             ThrowEvent_WebGLContextCreationError(text);
@@ -961,12 +943,9 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
     if (!CreateAndInitGL(forceEnabled, &failReasons)) {
         nsCString text("WebGL creation failed: ");
         for (const auto& cur : failReasons) {
-            Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_FAILURE_ID, cur.key);
-
             text.AppendASCII("\n* ");
             text.Append(cur.info);
         }
-        failureId = NS_LITERAL_CSTRING("FEATURE_FAILURE_REASON");
         ThrowEvent_WebGLContextCreationError(text);
         return NS_ERROR_FAILURE;
     }
@@ -978,7 +957,6 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
             DestroyResourcesAndContext();
             MOZ_ASSERT(!gl);
 
-            failureId = NS_LITERAL_CSTRING("FEATURE_FAILURE_WEBGL_PERF_WARP");
             const nsLiteralCString text("failIfMajorPerformanceCaveat: Driver is not"
                                         " hardware-accelerated.");
             ThrowEvent_WebGLContextCreationError(text);
@@ -992,7 +970,6 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
             DestroyResourcesAndContext();
             MOZ_ASSERT(!gl);
 
-            failureId = NS_LITERAL_CSTRING("FEATURE_FAILURE_WEBGL_DXGL_INTEROP2");
             const nsLiteralCString text("Caveat: WGL without DXGLInterop2.");
             ThrowEvent_WebGLContextCreationError(text);
             return NS_ERROR_FAILURE;
@@ -1001,7 +978,6 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
     }
 
     if (!ResizeBackbuffer(width, height)) {
-        failureId = NS_LITERAL_CSTRING("FEATURE_FAILURE_WEBGL_BACKBUFFER");
         const nsLiteralCString text("Initializing WebGL backbuffer failed.");
         ThrowEvent_WebGLContextCreationError(text);
         return NS_ERROR_FAILURE;
@@ -1085,7 +1061,6 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
 
     //////
 
-    failureId = NS_LITERAL_CSTRING("SUCCESS");
     return NS_OK;
 }
 
@@ -2263,84 +2238,6 @@ WebGLContext::GetUnpackSize(bool isFunc3D, uint32_t width, uint32_t height,
     return totalBytes;
 }
 
-already_AddRefed<layers::SharedSurfaceTextureClient>
-WebGLContext::GetVRFrame()
-{
-    if (!mLayerIsMirror) {
-        /**
-         * Do not allow VR frame submission until a mirroring canvas layer has
-         * been returned by GetCanvasLayer
-         */
-        return nullptr;
-    }
-
-    VRManagerChild* vrmc = VRManagerChild::Get();
-    if (!vrmc) {
-        return nullptr;
-    }
-
-    /**
-     * Swap buffers as though composition has occurred.
-     * We will then share the resulting front buffer to be submitted to the VR
-     * compositor.
-     */
-    BeginComposition();
-    EndComposition();
-
-    gl::GLScreenBuffer* screen = gl->Screen();
-    if (!screen) {
-        return nullptr;
-    }
-
-    RefPtr<SharedSurfaceTextureClient> sharedSurface = screen->Front();
-    if (!sharedSurface) {
-        return nullptr;
-    }
-
-    if (sharedSurface && sharedSurface->GetAllocator() != vrmc) {
-        RefPtr<SharedSurfaceTextureClient> dest =
-        screen->Factory()->NewTexClient(sharedSurface->GetSize());
-        if (!dest) {
-            return nullptr;
-        }
-        gl::SharedSurface* destSurf = dest->Surf();
-        destSurf->ProducerAcquire();
-        SharedSurface::ProdCopy(sharedSurface->Surf(), dest->Surf(),
-                                screen->Factory());
-        destSurf->ProducerRelease();
-
-        return dest.forget();
-    }
-
-  return sharedSurface.forget();
-}
-
-bool
-WebGLContext::StartVRPresentation()
-{
-    VRManagerChild* vrmc = VRManagerChild::Get();
-    if (!vrmc) {
-        return false;
-    }
-    gl::GLScreenBuffer* screen = gl->Screen();
-    if (!screen) {
-        return false;
-    }
-    gl::SurfaceCaps caps = screen->mCaps;
-
-    UniquePtr<gl::SurfaceFactory> factory =
-        gl::GLScreenBuffer::CreateFactory(gl,
-            caps,
-            vrmc,
-            vrmc->GetBackendType(),
-            TextureFlags::ORIGIN_BOTTOM_LEFT);
-
-    if (factory) {
-        screen->Morph(Move(factory));
-    }
-    return true;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 
 static inline size_t
diff --git a/dom/canvas/WebGLContext.h b/dom/canvas/WebGLContext.h
index b4d416a33..8a20237ff 100644
--- a/dom/canvas/WebGLContext.h
+++ b/dom/canvas/WebGLContext.h
@@ -275,8 +275,9 @@ struct TexImageSourceAdapter final : public TexImageSource
         mPboOffset = pboOffset;
     }
 
-    TexImageSourceAdapter(const dom::ImageBitmap* imageBitmap, ErrorResult*) {
+    TexImageSourceAdapter(const dom::ImageBitmap* imageBitmap, ErrorResult* out_error) {
         mImageBitmap = imageBitmap;
+        mOut_error = out_error;
     }
 
     TexImageSourceAdapter(const dom::ImageData* imageData, ErrorResult*) {
@@ -656,9 +657,6 @@ public:
     void PixelStorei(GLenum pname, GLint param);
     void PolygonOffset(GLfloat factor, GLfloat units);
 
-    already_AddRefed<layers::SharedSurfaceTextureClient> GetVRFrame();
-    bool StartVRPresentation();
-
     ////
 
     webgl::PackingInfo
diff --git a/dom/canvas/WebGLTextureUpload.cpp b/dom/canvas/WebGLTextureUpload.cpp
index 612d5889d..3839b5d5e 100644
--- a/dom/canvas/WebGLTextureUpload.cpp
+++ b/dom/canvas/WebGLTextureUpload.cpp
@@ -12,6 +12,7 @@
 #include "GLBlitHelper.h"
 #include "GLContext.h"
 #include "mozilla/gfx/2D.h"
+#include "mozilla/dom/HTMLCanvasElement.h"
 #include "mozilla/dom/HTMLVideoElement.h"
 #include "mozilla/dom/ImageBitmap.h"
 #include "mozilla/dom/ImageData.h"
@@ -214,9 +215,18 @@ FromPboOffset(WebGLContext* webgl, const char* funcName, TexImageTarget target,
 static UniquePtr<webgl::TexUnpackBlob>
 FromImageBitmap(WebGLContext* webgl, const char* funcName, TexImageTarget target,
               uint32_t width, uint32_t height, uint32_t depth,
-              const dom::ImageBitmap& imageBitmap)
+              const dom::ImageBitmap& imageBitmap, ErrorResult* aRv)
 {
+    if (imageBitmap.IsWriteOnly()) {
+        aRv->Throw(NS_ERROR_DOM_SECURITY_ERR);
+        return nullptr;
+    }
+
     UniquePtr<dom::ImageBitmapCloneData> cloneData = Move(imageBitmap.ToCloneData());
+    if (!cloneData) {
+        return nullptr;
+    }
+    
     const RefPtr<gfx::DataSourceSurface> surf = cloneData->mSurface;
 
     ////
@@ -293,6 +303,14 @@ WebGLContext::FromDomElem(const char* funcName, TexImageTarget target, uint32_t
                           uint32_t height, uint32_t depth, const dom::Element& elem,
                           ErrorResult* const out_error)
 {
+    if (elem.IsHTMLElement(nsGkAtoms::canvas)) {

+        const dom::HTMLCanvasElement* canvas = static_cast<const dom::HTMLCanvasElement*>(&elem);

+        if (canvas->IsWriteOnly()) {

+            out_error->Throw(NS_ERROR_DOM_SECURITY_ERR);

+            return nullptr;

+        }

+    }

+
     uint32_t flags = nsLayoutUtils::SFE_WANT_IMAGE_SURFACE |
                      nsLayoutUtils::SFE_USE_ELEMENT_SIZE_IF_VECTOR;
 
@@ -412,7 +430,7 @@ WebGLContext::From(const char* funcName, TexImageTarget target, GLsizei rawWidth
 
     if (src.mImageBitmap) {
         return FromImageBitmap(this, funcName, target, width, height, depth,
-                               *(src.mImageBitmap));
+                               *(src.mImageBitmap), src.mOut_error);
     }
 
     if (src.mImageData) {
diff --git a/dom/canvas/test/test_imagebitmap.html b/dom/canvas/test/test_imagebitmap.html
index b3d3c08ad..3b74970ac 100644
--- a/dom/canvas/test/test_imagebitmap.html
+++ b/dom/canvas/test/test_imagebitmap.html
@@ -270,13 +270,22 @@ function testSecurityErrors() {
   }
 
   function checkPromiseFailedWithSecurityError(p) {
-    return p.then( function(reason) { ok(false, "Did not get SecurityError with unclean source. ImageBitmap was created successfully."); },
-                   function(reason) { if (reason == "SecurityError: The operation is insecure.") {
-                                        ok(true, reason);
-                                      }
-                                      else {
-                                        ok(false, "Did not get SecurityError with unclean source. Error Message: " + reason);
-                                      }});
+    return p.then(imageBitmap => {
+      ok(!!imageBitmap, "ImageBitmaps are always created");
+      const context = document.createElement("canvas").getContext("2d");
+      context.drawImage(imageBitmap, 0, 0);
+      try {
+        context.getImageData(0, 0, 1, 1);
+        ok(false, "Did not get SecurityError with unclean source. ImageBitmap was created successfully.");
+      } catch (ex) {
+        if (ex == "SecurityError: The operation is insecure.") {
+          ok(true, ex);
+        }
+        else {
+          ok(false, "Did not get SecurityError with unclean source. Error Message: " + ex);
+        }
+      }
+    });
   }
 
   return Promise.all([
diff --git a/dom/console/Console.cpp b/dom/console/Console.cpp
index ff5a92167..b174172e0 100755
--- a/dom/console/Console.cpp
+++ b/dom/console/Console.cpp
@@ -797,7 +797,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Console)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWindow)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mConsoleEventNotifier)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Console)
diff --git a/dom/crypto/WebCryptoTask.cpp b/dom/crypto/WebCryptoTask.cpp
index f5fc7b5bc..e5f5882e9 100644
--- a/dom/crypto/WebCryptoTask.cpp
+++ b/dom/crypto/WebCryptoTask.cpp
@@ -452,7 +452,6 @@ void
 WebCryptoTask::FailWithError(nsresult aRv)
 {
   MOZ_ASSERT(IsOnOriginalThread());
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_RESOLVED, false);
 
   // Blindly convert nsresult to DOMException
   // Individual tasks must ensure they pass the right values
@@ -491,7 +490,6 @@ WebCryptoTask::CallCallback(nsresult rv)
   }
 
   Resolve();
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_RESOLVED, true);
 
   // Manually release mResultPromise while we're on the main thread
   mResultPromise = nullptr;
@@ -586,7 +584,7 @@ public:
 
       mMechanism = CKM_AES_CBC_PAD;
       telemetryAlg = TA_AES_CBC;
-      AesCbcParams params;
+      RootedDictionary<AesCbcParams> params(aCx);
       nsresult rv = Coerce(aCx, params, aAlgorithm);
       if (NS_FAILED(rv)) {
         mEarlyRv = NS_ERROR_DOM_INVALID_ACCESS_ERR;
@@ -603,7 +601,7 @@ public:
 
       mMechanism = CKM_AES_CTR;
       telemetryAlg = TA_AES_CTR;
-      AesCtrParams params;
+      RootedDictionary<AesCtrParams> params(aCx);
       nsresult rv = Coerce(aCx, params, aAlgorithm);
       if (NS_FAILED(rv)) {
         mEarlyRv = NS_ERROR_DOM_SYNTAX_ERR;
@@ -622,7 +620,7 @@ public:
 
       mMechanism = CKM_AES_GCM;
       telemetryAlg = TA_AES_GCM;
-      AesGcmParams params;
+      RootedDictionary<AesGcmParams> params(aCx);
       nsresult rv = Coerce(aCx, params, aAlgorithm);
       if (NS_FAILED(rv)) {
         mEarlyRv = NS_ERROR_DOM_SYNTAX_ERR;
@@ -650,7 +648,6 @@ public:
       mEarlyRv = NS_ERROR_DOM_NOT_SUPPORTED_ERR;
       return;
     }
-    Telemetry::Accumulate(Telemetry::WEBCRYPTO_ALG, telemetryAlg);
   }
 
 private:
@@ -794,7 +791,6 @@ public:
       return;
     }
 
-    Telemetry::Accumulate(Telemetry::WEBCRYPTO_ALG, TA_AES_KW);
   }
 
 private:
@@ -908,8 +904,6 @@ public:
   void Init(JSContext* aCx, const ObjectOrString& aAlgorithm,
             CryptoKey& aKey, bool aEncrypt)
   {
-    Telemetry::Accumulate(Telemetry::WEBCRYPTO_ALG, TA_RSA_OAEP);
-
     CHECK_KEY_ALGORITHM(aKey.Algorithm(), WEBCRYPTO_ALG_RSA_OAEP);
 
     if (mEncrypt) {
@@ -1049,7 +1043,6 @@ public:
       case CKM_SHA512_HMAC: telemetryAlg = TA_HMAC_SHA_512; break;
       default:              telemetryAlg = TA_UNKNOWN;
     }
-    Telemetry::Accumulate(Telemetry::WEBCRYPTO_ALG, telemetryAlg);
   }
 
 private:
@@ -1158,12 +1151,10 @@ public:
 
     if (algName.EqualsLiteral(WEBCRYPTO_ALG_RSASSA_PKCS1)) {
       mAlgorithm = Algorithm::RSA_PKCS1;
-      Telemetry::Accumulate(Telemetry::WEBCRYPTO_ALG, TA_RSASSA_PKCS1);
       CHECK_KEY_ALGORITHM(aKey.Algorithm(), WEBCRYPTO_ALG_RSASSA_PKCS1);
       hashAlgName = aKey.Algorithm().mRsa.mHash.mName;
     } else if (algName.EqualsLiteral(WEBCRYPTO_ALG_RSA_PSS)) {
       mAlgorithm = Algorithm::RSA_PSS;
-      Telemetry::Accumulate(Telemetry::WEBCRYPTO_ALG, TA_RSA_PSS);
       CHECK_KEY_ALGORITHM(aKey.Algorithm(), WEBCRYPTO_ALG_RSA_PSS);
 
       KeyAlgorithm& hashAlg = aKey.Algorithm().mRsa.mHash;
@@ -1188,7 +1179,6 @@ public:
       mSaltLength = params.mSaltLength;
     } else if (algName.EqualsLiteral(WEBCRYPTO_ALG_ECDSA)) {
       mAlgorithm = Algorithm::ECDSA;
-      Telemetry::Accumulate(Telemetry::WEBCRYPTO_ALG, TA_ECDSA);
       CHECK_KEY_ALGORITHM(aKey.Algorithm(), WEBCRYPTO_ALG_ECDSA);
 
       // For ECDSA, the hash name comes from the algorithm parameter
@@ -1356,7 +1346,6 @@ public:
       mEarlyRv = NS_ERROR_DOM_SYNTAX_ERR;
       return;
     }
-    Telemetry::Accumulate(Telemetry::WEBCRYPTO_ALG, telemetryAlg);
     mOidTag = MapHashAlgorithmNameToOID(algName);
   }
 
@@ -2656,7 +2645,6 @@ public:
   void Init(JSContext* aCx, const ObjectOrString& aAlgorithm, CryptoKey& aKey,
             uint32_t aLength)
   {
-    Telemetry::Accumulate(Telemetry::WEBCRYPTO_ALG, TA_HKDF);
     CHECK_KEY_ALGORITHM(aKey.Algorithm(), WEBCRYPTO_ALG_HKDF);
 
     // Check that we have a key.
@@ -2806,7 +2794,6 @@ public:
   void Init(JSContext* aCx, const ObjectOrString& aAlgorithm, CryptoKey& aKey,
             uint32_t aLength)
   {
-    Telemetry::Accumulate(Telemetry::WEBCRYPTO_ALG, TA_PBKDF2);
     CHECK_KEY_ALGORITHM(aKey.Algorithm(), WEBCRYPTO_ALG_PBKDF2);
 
     // Check that we got a symmetric key
@@ -2981,7 +2968,6 @@ public:
 
   void Init(JSContext* aCx, const ObjectOrString& aAlgorithm, CryptoKey& aKey)
   {
-    Telemetry::Accumulate(Telemetry::WEBCRYPTO_ALG, TA_ECDH);
     CHECK_KEY_ALGORITHM(aKey.Algorithm(), WEBCRYPTO_ALG_ECDH);
 
     // Check that we have a private key.
@@ -3277,10 +3263,6 @@ WebCryptoTask::CreateEncryptDecryptTask(JSContext* aCx,
                                         const CryptoOperationData& aData,
                                         bool aEncrypt)
 {
-  TelemetryMethod method = (aEncrypt)? TM_ENCRYPT : TM_DECRYPT;
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_METHOD, method);
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_EXTRACTABLE_ENC, aKey.Extractable());
-
   // Ensure key is usable for this operation
   if ((aEncrypt  && !aKey.HasUsage(CryptoKey::ENCRYPT)) ||
       (!aEncrypt && !aKey.HasUsage(CryptoKey::DECRYPT))) {
@@ -3312,10 +3294,6 @@ WebCryptoTask::CreateSignVerifyTask(JSContext* aCx,
                                     const CryptoOperationData& aData,
                                     bool aSign)
 {
-  TelemetryMethod method = (aSign)? TM_SIGN : TM_VERIFY;
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_METHOD, method);
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_EXTRACTABLE_SIG, aKey.Extractable());
-
   // Ensure key is usable for this operation
   if ((aSign  && !aKey.HasUsage(CryptoKey::SIGN)) ||
       (!aSign && !aKey.HasUsage(CryptoKey::VERIFY))) {
@@ -3345,8 +3323,6 @@ WebCryptoTask::CreateDigestTask(JSContext* aCx,
                                 const ObjectOrString& aAlgorithm,
                                 const CryptoOperationData& aData)
 {
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_METHOD, TM_DIGEST);
-
   nsString algName;
   nsresult rv = GetAlgorithmName(aCx, aAlgorithm, algName);
   if (NS_FAILED(rv)) {
@@ -3372,9 +3348,6 @@ WebCryptoTask::CreateImportKeyTask(nsIGlobalObject* aGlobal,
                                    bool aExtractable,
                                    const Sequence<nsString>& aKeyUsages)
 {
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_METHOD, TM_IMPORTKEY);
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_EXTRACTABLE_IMPORT, aExtractable);
-
   // Verify that the format is recognized
   if (!aFormat.EqualsLiteral(WEBCRYPTO_KEY_FORMAT_RAW) &&
       !aFormat.EqualsLiteral(WEBCRYPTO_KEY_FORMAT_SPKI) &&
@@ -3426,8 +3399,6 @@ WebCryptoTask*
 WebCryptoTask::CreateExportKeyTask(const nsAString& aFormat,
                                    CryptoKey& aKey)
 {
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_METHOD, TM_EXPORTKEY);
-
   // Verify that the format is recognized
   if (!aFormat.EqualsLiteral(WEBCRYPTO_KEY_FORMAT_RAW) &&
       !aFormat.EqualsLiteral(WEBCRYPTO_KEY_FORMAT_SPKI) &&
@@ -3470,9 +3441,6 @@ WebCryptoTask::CreateGenerateKeyTask(nsIGlobalObject* aGlobal,
                                      bool aExtractable,
                                      const Sequence<nsString>& aKeyUsages)
 {
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_METHOD, TM_GENERATEKEY);
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_EXTRACTABLE_GENERATE, aExtractable);
-
   // Verify that aKeyUsages does not contain an unrecognized value
   // SPEC-BUG: Spec says that this should be InvalidAccessError, but that
   // is inconsistent with other analogous points in the spec
@@ -3515,8 +3483,6 @@ WebCryptoTask::CreateDeriveKeyTask(nsIGlobalObject* aGlobal,
                                    bool aExtractable,
                                    const Sequence<nsString>& aKeyUsages)
 {
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_METHOD, TM_DERIVEKEY);
-
   // Ensure baseKey is usable for this operation
   if (!aBaseKey.HasUsage(CryptoKey::DERIVEKEY)) {
     return new FailureTask(NS_ERROR_DOM_INVALID_ACCESS_ERR);
@@ -3560,8 +3526,6 @@ WebCryptoTask::CreateDeriveBitsTask(JSContext* aCx,
                                     CryptoKey& aKey,
                                     uint32_t aLength)
 {
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_METHOD, TM_DERIVEBITS);
-
   // Ensure baseKey is usable for this operation
   if (!aKey.HasUsage(CryptoKey::DERIVEBITS)) {
     return new FailureTask(NS_ERROR_DOM_INVALID_ACCESS_ERR);
@@ -3599,8 +3563,6 @@ WebCryptoTask::CreateWrapKeyTask(JSContext* aCx,
                                  CryptoKey& aWrappingKey,
                                  const ObjectOrString& aWrapAlgorithm)
 {
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_METHOD, TM_WRAPKEY);
-
   // Verify that the format is recognized
   if (!aFormat.EqualsLiteral(WEBCRYPTO_KEY_FORMAT_RAW) &&
       !aFormat.EqualsLiteral(WEBCRYPTO_KEY_FORMAT_SPKI) &&
@@ -3652,8 +3614,6 @@ WebCryptoTask::CreateUnwrapKeyTask(nsIGlobalObject* aGlobal,
                                    bool aExtractable,
                                    const Sequence<nsString>& aKeyUsages)
 {
-  Telemetry::Accumulate(Telemetry::WEBCRYPTO_METHOD, TM_UNWRAPKEY);
-
   // Ensure key is usable for this operation
   if (!aUnwrappingKey.HasUsage(CryptoKey::UNWRAPKEY)) {
     return new FailureTask(NS_ERROR_DOM_INVALID_ACCESS_ERR);
diff --git a/dom/events/DOMEventTargetHelper.cpp b/dom/events/DOMEventTargetHelper.cpp
index f8a5227d6..dd9a01d8d 100644
--- a/dom/events/DOMEventTargetHelper.cpp
+++ b/dom/events/DOMEventTargetHelper.cpp
@@ -43,7 +43,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(DOMEventTargetHelper)
     NS_IMPL_CYCLE_COLLECTION_DESCRIBE(DOMEventTargetHelper, tmp->mRefCnt.get())
   }
 
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mListenerManager)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
diff --git a/dom/events/DataTransfer.cpp b/dom/events/DataTransfer.cpp
index 45c72e662..40a0f42e6 100644
--- a/dom/events/DataTransfer.cpp
+++ b/dom/events/DataTransfer.cpp
@@ -57,7 +57,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DataTransfer)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mItems)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDragTarget)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDragImage)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(DataTransfer)
 
diff --git a/dom/events/Event.cpp b/dom/events/Event.cpp
index f33bfa5a8..280e40ad5 100755
--- a/dom/events/Event.cpp
+++ b/dom/events/Event.cpp
@@ -231,7 +231,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Event)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPresContext)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mExplicitOriginalTarget)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 
diff --git a/dom/events/EventDispatcher.cpp b/dom/events/EventDispatcher.cpp
index 65f01844b..1d4dfd7d9 100644
--- a/dom/events/EventDispatcher.cpp
+++ b/dom/events/EventDispatcher.cpp
@@ -858,63 +858,46 @@ EventDispatcher::CreateEvent(EventTarget* aOwner,
 
   // And if we didn't get an event, check the type argument.
 
-#define LOG_EVENT_CREATION(name) mozilla::Telemetry::Accumulate( \
-    mozilla::Telemetry::CREATE_EVENT_##name, true);
-
   if (aEventType.LowerCaseEqualsLiteral("mouseevent")) {
-    LOG_EVENT_CREATION(MOUSEEVENT);
     return NS_NewDOMMouseEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("mouseevents")) {
-    LOG_EVENT_CREATION(MOUSEEVENTS);
     return NS_NewDOMMouseEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("popupevents")) {
-    LOG_EVENT_CREATION(POPUPEVENTS);
     return NS_NewDOMMouseEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("mousescrollevents")) {
-    LOG_EVENT_CREATION(MOUSESCROLLEVENTS);
     return NS_NewDOMMouseScrollEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("dragevent")) {
-    LOG_EVENT_CREATION(DRAGEVENT);
     return NS_NewDOMDragEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("dragevents")) {
-    LOG_EVENT_CREATION(DRAGEVENTS);
     return NS_NewDOMDragEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("keyboardevent")) {
-    LOG_EVENT_CREATION(KEYBOARDEVENT);
     return NS_NewDOMKeyboardEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("keyevents")) {
-    LOG_EVENT_CREATION(KEYEVENTS);
     return NS_NewDOMKeyboardEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("compositionevent")) {
-    LOG_EVENT_CREATION(COMPOSITIONEVENT);
     return NS_NewDOMCompositionEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("textevent")) {
-    LOG_EVENT_CREATION(TEXTEVENT);
     return NS_NewDOMCompositionEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("textevents")) {
-    LOG_EVENT_CREATION(TEXTEVENTS);
     return NS_NewDOMCompositionEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("mutationevent")) {
-    LOG_EVENT_CREATION(MUTATIONEVENT);
     return NS_NewDOMMutationEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("mutationevents")) {
-    LOG_EVENT_CREATION(MUTATIONEVENTS);
     return NS_NewDOMMutationEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("deviceorientationevent")) {
-    LOG_EVENT_CREATION(DEVICEORIENTATIONEVENT);
     DeviceOrientationEventInit init;
     RefPtr<Event> event =
       DeviceOrientationEvent::Constructor(aOwner, EmptyString(), init);
@@ -922,97 +905,74 @@ EventDispatcher::CreateEvent(EventTarget* aOwner,
     return event.forget();
   }
   if (aEventType.LowerCaseEqualsLiteral("devicemotionevent")) {
-    LOG_EVENT_CREATION(DEVICEMOTIONEVENT);
     return NS_NewDOMDeviceMotionEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("uievent")) {
-    LOG_EVENT_CREATION(UIEVENT);
     return NS_NewDOMUIEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("uievents")) {
-    LOG_EVENT_CREATION(UIEVENTS);
     return NS_NewDOMUIEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("event")) {
-    LOG_EVENT_CREATION(EVENT);
     return NS_NewDOMEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("events")) {
-    LOG_EVENT_CREATION(EVENTS);
     return NS_NewDOMEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("htmlevents")) {
-    LOG_EVENT_CREATION(HTMLEVENTS);
     return NS_NewDOMEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("svgevent")) {
-    LOG_EVENT_CREATION(SVGEVENT);
     return NS_NewDOMEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("svgevents")) {
-    LOG_EVENT_CREATION(SVGEVENTS);
     return NS_NewDOMEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("svgzoomevent")) {
-    LOG_EVENT_CREATION(SVGZOOMEVENT);
     return NS_NewDOMSVGZoomEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("svgzoomevents")) {
-    LOG_EVENT_CREATION(SVGZOOMEVENTS);
     return NS_NewDOMSVGZoomEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("timeevent")) {
-    LOG_EVENT_CREATION(TIMEEVENT);
     return NS_NewDOMTimeEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("timeevents")) {
-    LOG_EVENT_CREATION(TIMEEVENTS);
     return NS_NewDOMTimeEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("xulcommandevent")) {
-    LOG_EVENT_CREATION(XULCOMMANDEVENT);
     return NS_NewDOMXULCommandEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("xulcommandevents")) {
-    LOG_EVENT_CREATION(XULCOMMANDEVENTS);
     return NS_NewDOMXULCommandEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("commandevent")) {
-    LOG_EVENT_CREATION(COMMANDEVENT);
     return NS_NewDOMCommandEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("commandevents")) {
-    LOG_EVENT_CREATION(COMMANDEVENTS);
     return NS_NewDOMCommandEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("datacontainerevent")) {
-    LOG_EVENT_CREATION(DATACONTAINEREVENT);
     return NS_NewDOMDataContainerEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("datacontainerevents")) {
-    LOG_EVENT_CREATION(DATACONTAINEREVENTS);
     return NS_NewDOMDataContainerEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("messageevent")) {
-    LOG_EVENT_CREATION(MESSAGEEVENT);
     RefPtr<Event> event = new MessageEvent(aOwner, aPresContext, nullptr);
     return event.forget();
   }
   if (aEventType.LowerCaseEqualsLiteral("notifypaintevent")) {
-    LOG_EVENT_CREATION(NOTIFYPAINTEVENT);
     return NS_NewDOMNotifyPaintEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("simplegestureevent")) {
-    LOG_EVENT_CREATION(SIMPLEGESTUREEVENT);
     return NS_NewDOMSimpleGestureEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("beforeunloadevent")) {
-    LOG_EVENT_CREATION(BEFOREUNLOADEVENT);
     return NS_NewDOMBeforeUnloadEvent(aOwner, aPresContext, nullptr);
   }
   // XXXkhuey this is broken
   if (aEventType.LowerCaseEqualsLiteral("pagetransition")) {
-    LOG_EVENT_CREATION(PAGETRANSITION);
     PageTransitionEventInit init;
     RefPtr<Event> event =
       PageTransitionEvent::Constructor(aOwner, EmptyString(), init);
@@ -1020,14 +980,12 @@ EventDispatcher::CreateEvent(EventTarget* aOwner,
     return event.forget();
   }
   if (aEventType.LowerCaseEqualsLiteral("scrollareaevent")) {
-    LOG_EVENT_CREATION(SCROLLAREAEVENT);
     return NS_NewDOMScrollAreaEvent(aOwner, aPresContext, nullptr);
   }
   // XXXkhuey Chrome supports popstateevent here, even though it provides no
   // initPopStateEvent method.  This is nuts ... but copying it is unlikely to
   // break the web.
   if (aEventType.LowerCaseEqualsLiteral("popstateevent")) {
-    LOG_EVENT_CREATION(POPSTATEEVENT);
     AutoJSContext cx;
     RootedDictionary<PopStateEventInit> init(cx);
     RefPtr<Event> event =
@@ -1037,11 +995,9 @@ EventDispatcher::CreateEvent(EventTarget* aOwner,
   }
   if (aEventType.LowerCaseEqualsLiteral("touchevent") &&
       TouchEvent::PrefEnabled(nsContentUtils::GetDocShellForEventTarget(aOwner))) {
-    LOG_EVENT_CREATION(TOUCHEVENT);
     return NS_NewDOMTouchEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("hashchangeevent")) {
-    LOG_EVENT_CREATION(HASHCHANGEEVENT);
     HashChangeEventInit init;
     RefPtr<Event> event =
       HashChangeEvent::Constructor(aOwner, EmptyString(), init);
@@ -1049,11 +1005,9 @@ EventDispatcher::CreateEvent(EventTarget* aOwner,
     return event.forget();
   }
   if (aEventType.LowerCaseEqualsLiteral("customevent")) {
-    LOG_EVENT_CREATION(CUSTOMEVENT);
     return NS_NewDOMCustomEvent(aOwner, aPresContext, nullptr);
   }
   if (aEventType.LowerCaseEqualsLiteral("storageevent")) {
-    LOG_EVENT_CREATION(STORAGEEVENT);
     return NS_NewDOMStorageEvent(aOwner);
   }
   if (aEventType.LowerCaseEqualsLiteral("focusevent")) {
@@ -1062,8 +1016,6 @@ EventDispatcher::CreateEvent(EventTarget* aOwner,
     return event.forget();
   }
 
-#undef LOG_EVENT_CREATION
-
   // NEW EVENT TYPES SHOULD NOT BE ADDED HERE; THEY SHOULD USE ONLY EVENT
   // CONSTRUCTORS
 
diff --git a/dom/events/EventStateManager.cpp b/dom/events/EventStateManager.cpp
index 7bbfe21b7..e16d68c81 100644
--- a/dom/events/EventStateManager.cpp
+++ b/dom/events/EventStateManager.cpp
@@ -3240,6 +3240,12 @@ EventStateManager::PostHandleEvent(nsPresContext* aPresContext,
         action = WheelPrefs::GetInstance()->ComputeActionFor(wheelEvent);
       }
       switch (action) {
+        case WheelPrefs::ACTION_HSCROLL: {
+          // Swap axes and fall through
+          double deltaX = wheelEvent->mDeltaX;
+          wheelEvent->mDeltaX = wheelEvent->mDeltaY;
+          wheelEvent->mDeltaY = deltaX;
+        }
         case WheelPrefs::ACTION_SCROLL: {
           // For scrolling of default action, we should honor the mouse wheel
           // transaction.
diff --git a/dom/events/EventStateManager.h b/dom/events/EventStateManager.h
index d0461e7fa..95ce9a907 100644
--- a/dom/events/EventStateManager.h
+++ b/dom/events/EventStateManager.h
@@ -513,7 +513,8 @@ protected:
       ACTION_SCROLL,
       ACTION_HISTORY,
       ACTION_ZOOM,
-      ACTION_LAST = ACTION_ZOOM,
+      ACTION_HSCROLL,
+      ACTION_LAST = ACTION_HSCROLL,
       // Following actions are used only by internal processing.  So, cannot
       // specified by prefs.
       ACTION_SEND_TO_PLUGIN
diff --git a/dom/events/JSEventHandler.cpp b/dom/events/JSEventHandler.cpp
index 4b1b33313..b9e7c4d84 100644
--- a/dom/events/JSEventHandler.cpp
+++ b/dom/events/JSEventHandler.cpp
@@ -63,7 +63,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(JSEventHandler)
     NS_IMPL_CYCLE_COLLECTION_DESCRIBE(JSEventHandler, tmp->mRefCnt.get())
   }
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mTypedHandler.Ptr())
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(JSEventHandler)
diff --git a/dom/fetch/Fetch.cpp b/dom/fetch/Fetch.cpp
index 5c05f3602..f944352e3 100644
--- a/dom/fetch/Fetch.cpp
+++ b/dom/fetch/Fetch.cpp
@@ -38,7 +38,6 @@
 #include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/dom/URLSearchParams.h"
 #include "mozilla/dom/workers/ServiceWorkerManager.h"
-#include "mozilla/Telemetry.h"
 
 #include "InternalRequest.h"
 #include "InternalResponse.h"
@@ -237,8 +236,6 @@ FetchRequest(nsIGlobalObject* aGlobal, const RequestOrUSVString& aInput,
       }
     }
 
-    Telemetry::Accumulate(Telemetry::FETCH_IS_MAINTHREAD, 1);
-
     RefPtr<MainThreadFetchResolver> resolver = new MainThreadFetchResolver(p);
     RefPtr<FetchDriver> fetch = new FetchDriver(r, principal, loadGroup);
     fetch->SetDocument(doc);
@@ -251,8 +248,6 @@ FetchRequest(nsIGlobalObject* aGlobal, const RequestOrUSVString& aInput,
     WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
     MOZ_ASSERT(worker);
 
-    Telemetry::Accumulate(Telemetry::FETCH_IS_MAINTHREAD, 0);
-
     if (worker->IsServiceWorker()) {
       r->SetSkipServiceWorker();
     }
@@ -265,7 +260,7 @@ FetchRequest(nsIGlobalObject* aGlobal, const RequestOrUSVString& aInput,
     }
 
     RefPtr<MainThreadFetchRunnable> run = new MainThreadFetchRunnable(resolver, r);
-    worker->DispatchToMainThread(run.forget());
+    MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(run));
   }
 
   return p.forget();
diff --git a/dom/fetch/FetchConsumer.cpp b/dom/fetch/FetchConsumer.cpp
index 42dfcbaba..e82e5ec51 100644
--- a/dom/fetch/FetchConsumer.cpp
+++ b/dom/fetch/FetchConsumer.cpp
@@ -339,11 +339,7 @@ FetchBodyConsumer<Derived>::Create(nsIGlobalObject* aGlobal,
 
   nsCOMPtr<nsIRunnable> r = new BeginConsumeBodyRunnable<Derived>(consumer);
 
-  if (workerPrivate) {
-    aRv = workerPrivate->DispatchToMainThread(r.forget());
-  } else {
-    aRv = NS_DispatchToMainThread(r.forget());
-  }
+  aRv = NS_DispatchToMainThread(r.forget());
 
   if (NS_WARN_IF(aRv.Failed())) {
     return nullptr;
@@ -655,9 +651,7 @@ FetchBodyConsumer<Derived>::ShutDownMainThreadConsuming()
     nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
       [self] () { self->ShutDownMainThreadConsuming(); });
 
-    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
-    MOZ_ASSERT(workerPrivate);
-    workerPrivate->DispatchToMainThread(r.forget());
+    MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(r.forget()));
     return;
   }
 
diff --git a/dom/fetch/FetchDriver.cpp b/dom/fetch/FetchDriver.cpp
index aac79b829..6294b0dc5 100644
--- a/dom/fetch/FetchDriver.cpp
+++ b/dom/fetch/FetchDriver.cpp
@@ -77,9 +77,6 @@ FetchDriver::Fetch(FetchDriverObserver* aObserver)
 
   mObserver = aObserver;
 
-  Telemetry::Accumulate(Telemetry::SERVICE_WORKER_REQUEST_PASSTHROUGH,
-                        mRequest->WasCreatedByFetchEvent());
-
   // FIXME(nsm): Deal with HSTS.
 
   MOZ_RELEASE_ASSERT(!mRequest->IsSynchronous(),
@@ -906,11 +903,7 @@ FetchDriver::SetRequestHeaders(nsIHttpChannel* aChannel) const
 
   AutoTArray<InternalHeaders::Entry, 5> headers;
   mRequest->Headers()->GetEntries(headers);
-  bool hasAccept = false;
   for (uint32_t i = 0; i < headers.Length(); ++i) {
-    if (!hasAccept && headers[i].mName.EqualsLiteral("accept")) {
-      hasAccept = true;
-    }
     if (headers[i].mValue.IsEmpty()) {
       aChannel->SetEmptyRequestHeader(headers[i].mName);
     } else {
@@ -918,12 +911,6 @@ FetchDriver::SetRequestHeaders(nsIHttpChannel* aChannel) const
     }
   }
 
-  if (!hasAccept) {
-    aChannel->SetRequestHeader(NS_LITERAL_CSTRING("accept"),
-                               NS_LITERAL_CSTRING("*/*"),
-                               false /* merge */);
-  }
-
   if (mRequest->ForceOriginHeader()) {
     nsAutoString origin;
     if (NS_SUCCEEDED(nsContentUtils::GetUTFOrigin(mPrincipal, origin))) {
diff --git a/dom/fetch/Headers.cpp b/dom/fetch/Headers.cpp
index 1e1a46c62..ca5aa57a6 100644
--- a/dom/fetch/Headers.cpp
+++ b/dom/fetch/Headers.cpp
@@ -25,7 +25,7 @@ NS_INTERFACE_MAP_END
 // static
 already_AddRefed<Headers>
 Headers::Constructor(const GlobalObject& aGlobal,
-                     const Optional<HeadersOrByteStringSequenceSequenceOrByteStringMozMap>& aInit,
+                     const Optional<HeadersOrByteStringSequenceSequenceOrByteStringByteStringRecord>& aInit,
                      ErrorResult& aRv)
 {
   RefPtr<InternalHeaders> ih = new InternalHeaders();
@@ -39,8 +39,8 @@ Headers::Constructor(const GlobalObject& aGlobal,
     ih->Fill(*aInit.Value().GetAsHeaders().mInternalHeaders, aRv);
   } else if (aInit.Value().IsByteStringSequenceSequence()) {
     ih->Fill(aInit.Value().GetAsByteStringSequenceSequence(), aRv);
-  } else if (aInit.Value().IsByteStringMozMap()) {
-    ih->Fill(aInit.Value().GetAsByteStringMozMap(), aRv);
+  } else if (aInit.Value().IsByteStringByteStringRecord()) {
+    ih->Fill(aInit.Value().GetAsByteStringByteStringRecord(), aRv);
   }
 
   if (aRv.Failed()) {
@@ -53,7 +53,7 @@ Headers::Constructor(const GlobalObject& aGlobal,
 // static
 already_AddRefed<Headers>
 Headers::Constructor(const GlobalObject& aGlobal,
-                     const OwningHeadersOrByteStringSequenceSequenceOrByteStringMozMap& aInit,
+                     const OwningHeadersOrByteStringSequenceSequenceOrByteStringByteStringRecord& aInit,
                      ErrorResult& aRv)
 {
   nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
@@ -62,7 +62,7 @@ Headers::Constructor(const GlobalObject& aGlobal,
 
 /* static */ already_AddRefed<Headers>
 Headers::Create(nsIGlobalObject* aGlobal,
-                const OwningHeadersOrByteStringSequenceSequenceOrByteStringMozMap& aInit,
+                const OwningHeadersOrByteStringSequenceSequenceOrByteStringByteStringRecord& aInit,
                 ErrorResult& aRv)
 {
   RefPtr<InternalHeaders> ih = new InternalHeaders();
@@ -72,8 +72,8 @@ Headers::Create(nsIGlobalObject* aGlobal,
     ih->Fill(*(aInit.GetAsHeaders().get()->mInternalHeaders), aRv);
   } else if (aInit.IsByteStringSequenceSequence()) {
     ih->Fill(aInit.GetAsByteStringSequenceSequence(), aRv);
-  } else if (aInit.IsByteStringMozMap()) {
-    ih->Fill(aInit.GetAsByteStringMozMap(), aRv);
+  } else if (aInit.IsByteStringByteStringRecord()) {
+    ih->Fill(aInit.GetAsByteStringByteStringRecord(), aRv);
   }
 
   if (NS_WARN_IF(aRv.Failed())) {
diff --git a/dom/fetch/Headers.h b/dom/fetch/Headers.h
index b603dc836..1dd92f779 100644
--- a/dom/fetch/Headers.h
+++ b/dom/fetch/Headers.h
@@ -20,9 +20,9 @@ class ErrorResult;
 
 namespace dom {
 
-template<typename T> class MozMap;
-class HeadersOrByteStringSequenceSequenceOrByteStringMozMap;
-class OwningHeadersOrByteStringSequenceSequenceOrByteStringMozMap;
+template<typename K, typename V> class Record;
+class HeadersOrByteStringSequenceSequenceOrByteStringByteStringRecord;
+class OwningHeadersOrByteStringSequenceSequenceOrByteStringByteStringRecord;
 
 /**
  * This Headers class is only used to represent the content facing Headers
@@ -57,17 +57,17 @@ public:
 
   static already_AddRefed<Headers>
   Constructor(const GlobalObject& aGlobal,
-              const Optional<HeadersOrByteStringSequenceSequenceOrByteStringMozMap>& aInit,
+              const Optional<HeadersOrByteStringSequenceSequenceOrByteStringByteStringRecord>& aInit,
               ErrorResult& aRv);
 
   static already_AddRefed<Headers>
   Constructor(const GlobalObject& aGlobal,
-              const OwningHeadersOrByteStringSequenceSequenceOrByteStringMozMap& aInit,
+              const OwningHeadersOrByteStringSequenceSequenceOrByteStringByteStringRecord& aInit,
               ErrorResult& aRv);
 
   static already_AddRefed<Headers>
   Create(nsIGlobalObject* aGlobalObject,
-         const OwningHeadersOrByteStringSequenceSequenceOrByteStringMozMap& aInit,
+         const OwningHeadersOrByteStringSequenceSequenceOrByteStringByteStringRecord& aInit,
          ErrorResult& aRv);
 
   void Append(const nsACString& aName, const nsACString& aValue,
diff --git a/dom/fetch/InternalHeaders.cpp b/dom/fetch/InternalHeaders.cpp
index 11585615e..f66221d42 100644
--- a/dom/fetch/InternalHeaders.cpp
+++ b/dom/fetch/InternalHeaders.cpp
@@ -314,12 +314,13 @@ InternalHeaders::Fill(const Sequence<Sequence<nsCString>>& aInit, ErrorResult& a
 }
 
 void
-InternalHeaders::Fill(const MozMap<nsCString>& aInit, ErrorResult& aRv)
+InternalHeaders::Fill(const Record<nsCString, nsCString>& aInit, ErrorResult& aRv)
 {
-  nsTArray<nsString> keys;
-  aInit.GetKeys(keys);
-  for (uint32_t i = 0; i < keys.Length() && !aRv.Failed(); ++i) {
-    Append(NS_ConvertUTF16toUTF8(keys[i]), aInit.Get(keys[i]), aRv);
+  for (auto& entry : aInit.Entries()) {
+    Append(entry.mKey, entry.mValue, aRv);
+    if (aRv.Failed()) {
+      return;
+    }
   }
 }
 
diff --git a/dom/fetch/InternalHeaders.h b/dom/fetch/InternalHeaders.h
index 9a6d6dae7..98046f0ef 100644
--- a/dom/fetch/InternalHeaders.h
+++ b/dom/fetch/InternalHeaders.h
@@ -20,7 +20,7 @@ class ErrorResult;
 
 namespace dom {
 
-template<typename T> class MozMap;
+template<typename K, typename V> class Record;
 class HeadersEntry;
 
 class InternalHeaders final
@@ -113,7 +113,7 @@ public:
 
   void Fill(const InternalHeaders& aInit, ErrorResult& aRv);
   void Fill(const Sequence<Sequence<nsCString>>& aInit, ErrorResult& aRv);
-  void Fill(const MozMap<nsCString>& aInit, ErrorResult& aRv);
+  void Fill(const Record<nsCString, nsCString>& aInit, ErrorResult& aRv);
 
   bool HasOnlySimpleHeaders() const;
 
diff --git a/dom/filesystem/Directory.cpp b/dom/filesystem/Directory.cpp
index 59c78fb2c..5e8a4a745 100644
--- a/dom/filesystem/Directory.cpp
+++ b/dom/filesystem/Directory.cpp
@@ -36,7 +36,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Directory)
     tmp->mFileSystem->Traverse(cb);
   }
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(Directory)
diff --git a/dom/gamepad/GamepadManager.cpp b/dom/gamepad/GamepadManager.cpp
index dde71dd0a..e17829652 100644
--- a/dom/gamepad/GamepadManager.cpp
+++ b/dom/gamepad/GamepadManager.cpp
@@ -28,7 +28,6 @@
 #include "nsIObserverService.h"
 #include "nsIServiceManager.h"
 #include "nsThreadUtils.h"
-#include "VRManagerChild.h"
 #include "mozilla/Services.h"
 #include "mozilla/Unused.h"
 
@@ -110,11 +109,6 @@ GamepadManager::StopMonitoring()
   }
   mChannelChildren.Clear();
   mGamepads.Clear();
-
-#if defined(XP_WIN) || defined(XP_MACOSX) || defined(XP_LINUX)
-  mVRChannelChild = gfx::VRManagerChild::Get();
-  mVRChannelChild->SendControllerListenerRemoved();
-#endif
 }
 
 void
@@ -211,11 +205,6 @@ uint32_t GamepadManager::GetGamepadIndexWithServiceType(uint32_t aIndex,
      newIndex = aIndex;
      break;
     }
-    case GamepadServiceType::VR:
-    {
-     newIndex = aIndex + VR_GAMEPAD_IDX_OFFSET;
-     break;
-    }
     default:
      MOZ_ASSERT(false);
      break;
@@ -679,13 +668,6 @@ GamepadManager::ActorCreated(PBackgroundChild *aActor)
   MOZ_ASSERT(initedChild == child);
   child->SendGamepadListenerAdded();
   mChannelChildren.AppendElement(child);
-
-#if defined(XP_WIN) || defined(XP_MACOSX) || defined(XP_LINUX)
-  // Construct VRManagerChannel and ask adding the connected
-  // VR controllers to GamepadManager
-  mVRChannelChild = gfx::VRManagerChild::Get();
-  mVRChannelChild->SendControllerListenerAdded();
-#endif
 }
 
 //Override nsIIPCBackgroundChildCreateCallback
diff --git a/dom/gamepad/GamepadManager.h b/dom/gamepad/GamepadManager.h
index 1bb437d8f..a772221ca 100644
--- a/dom/gamepad/GamepadManager.h
+++ b/dom/gamepad/GamepadManager.h
@@ -16,9 +16,6 @@
 class nsGlobalWindow;
 
 namespace mozilla {
-namespace gfx {
-class VRManagerChild;
-} // namespace gfx
 namespace dom {
 
 class EventTarget;
@@ -123,7 +120,6 @@ class GamepadManager final : public nsIObserver,
   // will be destroyed during the IPDL shutdown chain, so we
   // don't need to refcount it here.
   nsTArray<GamepadEventChannelChild *> mChannelChildren;
-  gfx::VRManagerChild* mVRChannelChild;
 
  private:
 
@@ -138,8 +134,6 @@ class GamepadManager final : public nsIObserver,
   // Indicate that a window has received data from a gamepad.
   void SetWindowHasSeenGamepad(nsGlobalWindow* aWindow, uint32_t aIndex,
                                bool aHasSeen = true);
-  // Our gamepad index has VR_GAMEPAD_IDX_OFFSET while GamepadChannelType
-  // is from VRManager.
   uint32_t GetGamepadIndexWithServiceType(uint32_t aIndex, GamepadServiceType aServiceType);
 
   // Gamepads connected to the system. Copies of these are handed out
diff --git a/dom/gamepad/GamepadServiceTest.cpp b/dom/gamepad/GamepadServiceTest.cpp
index a6fde58f0..89429b52a 100644
--- a/dom/gamepad/GamepadServiceTest.cpp
+++ b/dom/gamepad/GamepadServiceTest.cpp
@@ -35,7 +35,6 @@ NS_IMPL_CYCLE_COLLECTION_CLASS(GamepadServiceTest)
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(GamepadServiceTest,
                                                   DOMEventTargetHelper)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWindow)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
diff --git a/dom/gamepad/ipc/GamepadServiceType.h b/dom/gamepad/ipc/GamepadServiceType.h
index acc0967d1..6200cdfa9 100644
--- a/dom/gamepad/ipc/GamepadServiceType.h
+++ b/dom/gamepad/ipc/GamepadServiceType.h
@@ -6,11 +6,9 @@ namespace mozilla{
 namespace dom{
 
 // Standard channel is used for managing gamepads that
-// are from GamepadPlatformService. VR channel
-// is for gamepads that are from VRManagerChild.
+// are from GamepadPlatformService.
 enum class GamepadServiceType : uint16_t {
   Standard,
-  VR,
   NumGamepadServiceType
 };
 
diff --git a/dom/geolocation/nsGeolocation.cpp b/dom/geolocation/nsGeolocation.cpp
index 2d84a3e11..846e7fff4 100644
--- a/dom/geolocation/nsGeolocation.cpp
+++ b/dom/geolocation/nsGeolocation.cpp
@@ -7,7 +7,6 @@
 #include "nsXULAppAPI.h"
 
 #include "mozilla/dom/ContentChild.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/UniquePtr.h"
 
 #include "nsGeolocation.h"
@@ -70,7 +69,6 @@ class nsGeolocationRequest final
                        GeoPositionCallback aCallback,
                        GeoPositionErrorCallback aErrorCallback,
                        UniquePtr<PositionOptions>&& aOptions,
-                       uint8_t aProtocolType,
                        bool aWatchPositionRequest = false,
                        int32_t aWatchId = 0);
 
@@ -119,7 +117,6 @@ class nsGeolocationRequest final
   int32_t mWatchId;
   bool mShutdown;
   nsCOMPtr<nsIContentPermissionRequester> mRequester;
-  uint8_t mProtocolType;
 };
 
 static UniquePtr<PositionOptions>
@@ -287,7 +284,6 @@ nsGeolocationRequest::nsGeolocationRequest(Geolocation* aLocator,
                                            GeoPositionCallback aCallback,
                                            GeoPositionErrorCallback aErrorCallback,
                                            UniquePtr<PositionOptions>&& aOptions,
-                                           uint8_t aProtocolType,
                                            bool aWatchPositionRequest,
                                            int32_t aWatchId)
   : mIsWatchPositionRequest(aWatchPositionRequest),
@@ -296,8 +292,7 @@ nsGeolocationRequest::nsGeolocationRequest(Geolocation* aLocator,
     mOptions(Move(aOptions)),
     mLocator(aLocator),
     mWatchId(aWatchId),
-    mShutdown(false),
-    mProtocolType(aProtocolType)
+    mShutdown(false)
 {
   if (nsCOMPtr<nsPIDOMWindowInner> win =
       do_QueryReferent(mLocator->GetOwner())) {
@@ -382,13 +377,6 @@ nsGeolocationRequest::GetElement(nsIDOMElement * *aRequestingElement)
 NS_IMETHODIMP
 nsGeolocationRequest::Cancel()
 {
-  if (mRequester) {
-    // Record the number of denied requests for regular web content.
-    // This method is only called when the user explicitly denies the request,
-    // and is not called when the page is simply unloaded, or similar.
-    Telemetry::Accumulate(Telemetry::GEOLOCATION_REQUEST_GRANTED, mProtocolType);
-  }
-
   if (mLocator->ClearPendingRequest(this)) {
     return NS_OK;
   }
@@ -402,27 +390,6 @@ nsGeolocationRequest::Allow(JS::HandleValue aChoices)
 {
   MOZ_ASSERT(aChoices.isUndefined());
 
-  if (mRequester) {
-    // Record the number of granted requests for regular web content.
-    Telemetry::Accumulate(Telemetry::GEOLOCATION_REQUEST_GRANTED, mProtocolType + 10);
-
-    // Record whether a location callback is fulfilled while the owner window
-    // is not visible.
-    bool isVisible = false;
-    nsCOMPtr<nsPIDOMWindowInner> window = mLocator->GetParentObject();
-
-    if (window) {
-      nsCOMPtr<nsIDocument> doc = window->GetDoc();
-      isVisible = doc && !doc->Hidden();
-    }
-
-    if (IsWatch()) {
-      mozilla::Telemetry::Accumulate(mozilla::Telemetry::GEOLOCATION_WATCHPOSITION_VISIBLE, isVisible);
-    } else {
-      mozilla::Telemetry::Accumulate(mozilla::Telemetry::GEOLOCATION_GETCURRENTPOSITION_VISIBLE, isVisible);
-    }
-  }
-
   if (mLocator->ClearPendingRequest(this)) {
     return NS_OK;
   }
@@ -977,8 +944,7 @@ NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Geolocation,
                                       mPendingRequests)
 
 Geolocation::Geolocation()
-: mProtocolType(ProtocolType::OTHER)
-, mLastWatchId(0)
+: mLastWatchId(0)
 {
 }
 
@@ -1010,23 +976,6 @@ Geolocation::Init(nsPIDOMWindowInner* aContentDom)
     nsCOMPtr<nsIURI> uri;
     nsresult rv = mPrincipal->GetURI(getter_AddRefs(uri));
     NS_ENSURE_SUCCESS(rv, rv);
-
-    if (uri) {
-      bool isHttp;
-      rv = uri->SchemeIs("http", &isHttp);
-      NS_ENSURE_SUCCESS(rv, rv);
-
-      bool isHttps;
-      rv = uri->SchemeIs("https", &isHttps);
-      NS_ENSURE_SUCCESS(rv, rv);
-
-      // Store the protocol to send via telemetry later.
-      if (isHttp) {
-        mProtocolType = ProtocolType::HTTP;
-      } else if (isHttps) {
-        mProtocolType = ProtocolType::HTTPS;
-      }
-    }
   }
 
   // If no aContentDom was passed into us, we are being used
@@ -1110,7 +1059,6 @@ Geolocation::Update(nsIDOMGeoPosition *aSomewhere)
     if (coords) {
       double accuracy = -1;
       coords->GetAccuracy(&accuracy);
-      mozilla::Telemetry::Accumulate(mozilla::Telemetry::GEOLOCATION_ACCURACY_EXPONENTIAL, accuracy);
     }
   }
 
@@ -1135,8 +1083,6 @@ Geolocation::NotifyError(uint16_t aErrorCode)
     return NS_OK;
   }
 
-  mozilla::Telemetry::Accumulate(mozilla::Telemetry::GEOLOCATION_ERROR, true);
-
   for (uint32_t i = mPendingCallbacks.Length(); i > 0; i--) {
     mPendingCallbacks[i-1]->NotifyErrorAndShutdown(aErrorCode);
     //NotifyErrorAndShutdown() removes the request from the array
@@ -1214,13 +1160,9 @@ Geolocation::GetCurrentPosition(GeoPositionCallback callback,
 
   // After this we hand over ownership of options to our nsGeolocationRequest.
 
-  // Count the number of requests per protocol/scheme.
-  Telemetry::Accumulate(Telemetry::GEOLOCATION_GETCURRENTPOSITION_SECURE_ORIGIN,
-                        static_cast<uint8_t>(mProtocolType));
-
   RefPtr<nsGeolocationRequest> request =
     new nsGeolocationRequest(this, Move(callback), Move(errorCallback),
-                             Move(options), static_cast<uint8_t>(mProtocolType),
+                             Move(options),
                              false);
 
   if (!sGeoEnabled) {
@@ -1292,17 +1234,13 @@ Geolocation::WatchPosition(GeoPositionCallback aCallback,
     return NS_ERROR_NOT_AVAILABLE;
   }
 
-  // Count the number of requests per protocol/scheme.
-  Telemetry::Accumulate(Telemetry::GEOLOCATION_WATCHPOSITION_SECURE_ORIGIN,
-                        static_cast<uint8_t>(mProtocolType));
-
   // The watch ID:
   *aRv = mLastWatchId++;
 
   RefPtr<nsGeolocationRequest> request =
     new nsGeolocationRequest(this, Move(aCallback), Move(aErrorCallback),
                              Move(aOptions),
-                             static_cast<uint8_t>(mProtocolType), true, *aRv);
+                             true, *aRv);
 
   if (!sGeoEnabled) {
     nsCOMPtr<nsIRunnable> ev = new RequestAllowEvent(false, request);
diff --git a/dom/geolocation/nsGeolocation.h b/dom/geolocation/nsGeolocation.h
index 0bc527e34..0bcc587e4 100644
--- a/dom/geolocation/nsGeolocation.h
+++ b/dom/geolocation/nsGeolocation.h
@@ -202,12 +202,6 @@ private:
   // where the content was loaded from
   nsCOMPtr<nsIPrincipal> mPrincipal;
 
-  // the protocols we want to measure
-  enum class ProtocolType: uint8_t { OTHER, HTTP, HTTPS };
-
-  // the protocol used to load the content
-  ProtocolType mProtocolType;
-
   // owning back pointer.
   RefPtr<nsGeolocationService> mService;
 
diff --git a/dom/html/HTMLCanvasElement.cpp b/dom/html/HTMLCanvasElement.cpp
index 88b41bce0..a01795d9e 100644
--- a/dom/html/HTMLCanvasElement.cpp
+++ b/dom/html/HTMLCanvasElement.cpp
@@ -42,7 +42,6 @@
 #include "nsRefreshDriver.h"
 #include "nsStreamUtils.h"
 #include "ActiveLayerTracker.h"
-#include "VRManagerChild.h"
 #include "WebGL1Context.h"
 #include "WebGL2Context.h"
 
@@ -358,7 +357,6 @@ NS_IMPL_ISUPPORTS(HTMLCanvasElementObserver, nsIObserver)
 HTMLCanvasElement::HTMLCanvasElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
   : nsGenericHTMLElement(aNodeInfo),
     mResetLayer(true) ,
-    mVRPresentationActive(false),
     mWriteOnly(false)
 {}
 
@@ -1002,7 +1000,7 @@ HTMLCanvasElement::GetSize()
 }
 
 bool
-HTMLCanvasElement::IsWriteOnly()
+HTMLCanvasElement::IsWriteOnly() const
 {
   return mWriteOnly;
 }
@@ -1111,7 +1109,7 @@ HTMLCanvasElement::GetCanvasLayer(nsDisplayListBuilder* aBuilder,
   static uint8_t sOffscreenCanvasLayerUserDataDummy = 0;
 
   if (mCurrentContext) {
-    return mCurrentContext->GetCanvasLayer(aBuilder, aOldLayer, aManager, mVRPresentationActive);
+    return mCurrentContext->GetCanvasLayer(aBuilder, aOldLayer, aManager);
   }
 
   if (mOffscreenCanvas) {
@@ -1441,42 +1439,5 @@ HTMLCanvasElement::InvalidateFromAsyncCanvasRenderer(AsyncCanvasRenderer *aRende
   element->InvalidateCanvasContent(nullptr);
 }
 
-void
-HTMLCanvasElement::StartVRPresentation()
-{
-  WebGLContext* webgl = static_cast<WebGLContext*>(GetContextAtIndex(0));
-  if (!webgl) {
-    return;
-  }
-
-  if (!webgl->StartVRPresentation()) {
-    return;
-  }
-
-  mVRPresentationActive = true;
-}
-
-void
-HTMLCanvasElement::StopVRPresentation()
-{
-  mVRPresentationActive = false;
-}
-
-already_AddRefed<layers::SharedSurfaceTextureClient>
-HTMLCanvasElement::GetVRFrame()
-{
-  if (GetCurrentContextType() != CanvasContextType::WebGL1 &&
-      GetCurrentContextType() != CanvasContextType::WebGL2) {
-    return nullptr;
-  }
-
-  WebGLContext* webgl = static_cast<WebGLContext*>(GetContextAtIndex(0));
-  if (!webgl) {
-    return nullptr;
-  }
-
-  return webgl->GetVRFrame();
-}
-
 } // namespace dom
 } // namespace mozilla
diff --git a/dom/html/HTMLCanvasElement.h b/dom/html/HTMLCanvasElement.h
index 81c141d3c..e77db6ff1 100644
--- a/dom/html/HTMLCanvasElement.h
+++ b/dom/html/HTMLCanvasElement.h
@@ -224,9 +224,9 @@ public:
   nsIntSize GetSize();
 
   /**
-   * Determine whether the canvas is write-only.
+   * Determine whether the canvas is write-only (tainted).
    */
-  bool IsWriteOnly();
+  bool IsWriteOnly() const;
 
   /**
    * Force the canvas to be write-only.
@@ -350,10 +350,6 @@ public:
   static void SetAttrFromAsyncCanvasRenderer(AsyncCanvasRenderer *aRenderer);
   static void InvalidateFromAsyncCanvasRenderer(AsyncCanvasRenderer *aRenderer);
 
-  void StartVRPresentation();
-  void StopVRPresentation();
-  already_AddRefed<layers::SharedSurfaceTextureClient> GetVRFrame();
-
 protected:
   virtual ~HTMLCanvasElement();
 
diff --git a/dom/html/HTMLFormControlsCollection.cpp b/dom/html/HTMLFormControlsCollection.cpp
index d91a6b5de..77fafae99 100644
--- a/dom/html/HTMLFormControlsCollection.cpp
+++ b/dom/html/HTMLFormControlsCollection.cpp
@@ -134,7 +134,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(HTMLFormControlsCollection)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(HTMLFormControlsCollection)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNameLookupTable)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(HTMLFormControlsCollection)
   NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
diff --git a/dom/html/HTMLFormElement.cpp b/dom/html/HTMLFormElement.cpp
index 5164391f8..6bea19a2b 100644
--- a/dom/html/HTMLFormElement.cpp
+++ b/dom/html/HTMLFormElement.cpp
@@ -38,7 +38,6 @@
 // form submission
 #include "HTMLFormSubmissionConstants.h"
 #include "mozilla/dom/FormData.h"
-#include "mozilla/Telemetry.h"
 #include "nsIFormSubmitObserver.h"
 #include "nsIObserverService.h"
 #include "nsICategoryManager.h"
@@ -52,7 +51,6 @@
 #include "nsIWebProgress.h"
 #include "nsIDocShell.h"
 #include "nsIPrompt.h"
-#include "nsISecurityUITelemetry.h"
 #include "nsIStringBundle.h"
 
 // radio buttons
@@ -955,15 +953,6 @@ HTMLFormElement::DoSecureToInsecureSubmitCheck(nsIURI* aActionURL,
     return rv;
   }
   *aCancelSubmit = (buttonPressed == 1);
-  uint32_t telemetryBucket =
-    nsISecurityUITelemetry::WARNING_CONFIRM_POST_TO_INSECURE_FROM_SECURE;
-  mozilla::Telemetry::Accumulate(mozilla::Telemetry::SECURITY_UI,
-                                 telemetryBucket);
-  if (!*aCancelSubmit) {
-    // The user opted to continue, so note that in the next telemetry bucket.
-    mozilla::Telemetry::Accumulate(mozilla::Telemetry::SECURITY_UI,
-                                   telemetryBucket + 1);
-  }
   return NS_OK;
 }
 
diff --git a/dom/html/HTMLImageElement.cpp b/dom/html/HTMLImageElement.cpp
index 4b2e7a07b..fab1cdef4 100644
--- a/dom/html/HTMLImageElement.cpp
+++ b/dom/html/HTMLImageElement.cpp
@@ -1345,8 +1345,6 @@ HTMLImageElement::FlushUseCounters()
 
   nsCOMPtr<imgIContainer> container;
   request->GetImage(getter_AddRefs(container));
-
-  static_cast<image::Image*>(container.get())->ReportUseCounters();
 }
 
 } // namespace dom
diff --git a/dom/html/HTMLInputElement.cpp b/dom/html/HTMLInputElement.cpp
index e9086933b..0b879bb9b 100644
--- a/dom/html/HTMLInputElement.cpp
+++ b/dom/html/HTMLInputElement.cpp
@@ -24,7 +24,6 @@
 #include "nsIPhonetic.h"
 
 #include "HTMLFormSubmissionConstants.h"
-#include "mozilla/Telemetry.h"
 #include "nsIControllers.h"
 #include "nsIStringBundle.h"
 #include "nsFocusManager.h"
@@ -1275,10 +1274,6 @@ HTMLInputElement::BeforeSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
         container->RadioRequiredWillChange(name, !!aValue);
       }
     }
-
-    if (aName == nsGkAtoms::webkitdirectory) {
-      Telemetry::Accumulate(Telemetry::WEBKIT_DIRECTORY_USED, true);
-    }
   }
 
   return nsGenericHTMLFormElementWithState::BeforeSetAttr(aNameSpaceID, aName,
@@ -4989,10 +4984,6 @@ HTMLInputElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
                                  true);
       dispatcher->PostDOMEvent();
     }
-
-#ifdef EARLY_BETA_OR_EARLIER
-    Telemetry::Accumulate(Telemetry::PWMGR_PASSWORD_INPUT_IN_FORM, !!mForm);
-#endif
   }
 
   return rv;
@@ -8863,7 +8854,6 @@ HTMLInputElement::UpdateEntries(const nsTArray<OwningFileOrDirectory>& aFilesOrD
 void
 HTMLInputElement::GetWebkitEntries(nsTArray<RefPtr<FileSystemEntry>>& aSequence)
 {
-  Telemetry::Accumulate(Telemetry::BLINK_FILESYSTEM_USED, true);
   aSequence.AppendElements(mEntries);
 }
 
diff --git a/dom/html/HTMLMediaElement.cpp b/dom/html/HTMLMediaElement.cpp
index 3954e6208..050d1ac69 100644
--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -92,7 +92,6 @@
 #include "mozilla/dom/VideoTrackList.h"
 #include "mozilla/dom/TextTrack.h"
 #include "nsIContentPolicy.h"
-#include "mozilla/Telemetry.h"
 #include "DecoderDoctorDiagnostics.h"
 #include "DecoderTraits.h"
 #include "MediaContentType.h"
@@ -1038,14 +1037,6 @@ void HTMLMediaElement::ShutdownDecoder()
 
 void HTMLMediaElement::AbortExistingLoads()
 {
-#ifdef MOZ_EME
-  // If there is no existing decoder then we don't have anything to
-  // report. This prevents reporting the initial load from an
-  // empty video element as a failed EME load.
-  if (mDecoder) {
-    ReportEMETelemetry();
-  }
-#endif
   // Abort any already-running instance of the resource selection algorithm.
   mLoadWaitStatus = NOT_WAITING;
 
@@ -1901,8 +1892,6 @@ NS_IMETHODIMP HTMLMediaElement::GetCurrentTime(double* aCurrentTime)
 void
 HTMLMediaElement::FastSeek(double aTime, ErrorResult& aRv)
 {
-  LOG(LogLevel::Debug, ("Reporting telemetry VIDEO_FASTSEEK_USED"));
-  Telemetry::Accumulate(Telemetry::VIDEO_FASTSEEK_USED, 1);
   RefPtr<Promise> tobeDropped = Seek(aTime, SeekTarget::PrevSyncPoint, aRv);
 }
 
@@ -3156,10 +3145,6 @@ HTMLMediaElement::~HTMLMediaElement()
   if (mProgressTimer) {
     StopProgress();
   }
-  if (mVideoDecodeSuspendTimer) {
-    mVideoDecodeSuspendTimer->Cancel();
-    mVideoDecodeSuspendTimer = nullptr;
-  }
   if (mSrcStream) {
     EndSrcMediaStreamPlayback();
   }
@@ -3650,228 +3635,6 @@ nsresult HTMLMediaElement::BindToTree(nsIDocument* aDocument, nsIContent* aParen
   return rv;
 }
 
-/* static */
-void HTMLMediaElement::VideoDecodeSuspendTimerCallback(nsITimer* aTimer, void* aClosure)
-{
-  MOZ_ASSERT(NS_IsMainThread());
-  auto element = static_cast<HTMLMediaElement*>(aClosure);
-  element->mVideoDecodeSuspendTime.Start();
-  element->mVideoDecodeSuspendTimer = nullptr;
-}
-
-void HTMLMediaElement::HiddenVideoStart()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-  mHiddenPlayTime.Start();
-  if (mVideoDecodeSuspendTimer) {
-    // Already started, just keep it running.
-    return;
-  }
-  mVideoDecodeSuspendTimer = do_CreateInstance("@mozilla.org/timer;1");
-  mVideoDecodeSuspendTimer->InitWithNamedFuncCallback(
-    VideoDecodeSuspendTimerCallback, this,
-    MediaPrefs::MDSMSuspendBackgroundVideoDelay(), nsITimer::TYPE_ONE_SHOT,
-    "HTMLMediaElement::VideoDecodeSuspendTimerCallback");
-}
-
-void HTMLMediaElement::HiddenVideoStop()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-  mHiddenPlayTime.Pause();
-  mVideoDecodeSuspendTime.Pause();
-  if (!mVideoDecodeSuspendTimer) {
-    return;
-  }
-  mVideoDecodeSuspendTimer->Cancel();
-  mVideoDecodeSuspendTimer = nullptr;
-}
-
-#ifdef MOZ_EME
-void
-HTMLMediaElement::ReportEMETelemetry()
-{
-  // Report telemetry for EME videos when a page is unloaded.
-  NS_ASSERTION(NS_IsMainThread(), "Should be on main thread.");
-  if (mIsEncrypted && Preferences::GetBool("media.eme.enabled")) {
-    Telemetry::Accumulate(Telemetry::VIDEO_EME_PLAY_SUCCESS, mLoadedDataFired);
-    LOG(LogLevel::Debug, ("%p VIDEO_EME_PLAY_SUCCESS = %s",
-                       this, mLoadedDataFired ? "true" : "false"));
-  }
-}
-#endif
-
-void
-HTMLMediaElement::ReportTelemetry()
-{
-  // Report telemetry for videos when a page is unloaded. We
-  // want to know data on what state the video is at when
-  // the user has exited.
-  enum UnloadedState {
-    ENDED = 0,
-    PAUSED = 1,
-    STALLED = 2,
-    SEEKING = 3,
-    OTHER = 4
-  };
-
-  UnloadedState state = OTHER;
-  if (Seeking()) {
-    state = SEEKING;
-  }
-  else if (Ended()) {
-    state = ENDED;
-  }
-  else if (Paused()) {
-    state = PAUSED;
-  }
-  else {
-    // For buffering we check if the current playback position is at the end
-    // of a buffered range, within a margin of error. We also consider to be
-    // buffering if the last frame status was buffering and the ready state is
-    // HAVE_CURRENT_DATA to account for times where we are in a buffering state
-    // regardless of what actual data we have buffered.
-    bool stalled = false;
-    RefPtr<TimeRanges> ranges = Buffered();
-    const double errorMargin = 0.05;
-    double t = CurrentTime();
-    TimeRanges::index_type index = ranges->Find(t, errorMargin);
-    ErrorResult ignore;
-    stalled = index != TimeRanges::NoIndex &&
-              (ranges->End(index, ignore) - t) < errorMargin;
-    stalled |= mDecoder && NextFrameStatus() == MediaDecoderOwner::NEXT_FRAME_UNAVAILABLE_BUFFERING &&
-               mReadyState == HTMLMediaElement::HAVE_CURRENT_DATA;
-    if (stalled) {
-      state = STALLED;
-    }
-  }
-
-  Telemetry::Accumulate(Telemetry::VIDEO_UNLOAD_STATE, state);
-  LOG(LogLevel::Debug, ("%p VIDEO_UNLOAD_STATE = %d", this, state));
-
-  FrameStatisticsData data;
-
-  if (HTMLVideoElement* vid = HTMLVideoElement::FromContentOrNull(this)) {
-    FrameStatistics* stats = vid->GetFrameStatistics();
-    if (stats) {
-      data = stats->GetFrameStatisticsData();
-      if (data.mParsedFrames) {
-        MOZ_ASSERT(data.mDroppedFrames <= data.mParsedFrames);
-        // Dropped frames <= total frames, so 'percentage' cannot be higher than
-        // 100 and therefore can fit in a uint32_t (that Telemetry takes).
-        uint32_t percentage = 100 * data.mDroppedFrames / data.mParsedFrames;
-        LOG(LogLevel::Debug,
-            ("Reporting telemetry DROPPED_FRAMES_IN_VIDEO_PLAYBACK"));
-        Telemetry::Accumulate(Telemetry::VIDEO_DROPPED_FRAMES_PROPORTION,
-                              percentage);
-      }
-    }
-  }
-
-  if (mMediaInfo.HasVideo() &&
-      mMediaInfo.mVideo.mImage.height > 0) {
-    // We have a valid video.
-    double playTime = mPlayTime.Total();
-    double hiddenPlayTime = mHiddenPlayTime.Total();
-    double videoDecodeSuspendTime = mVideoDecodeSuspendTime.Total();
-
-    Telemetry::Accumulate(Telemetry::VIDEO_PLAY_TIME_MS, SECONDS_TO_MS(playTime));
-    LOG(LogLevel::Debug, ("%p VIDEO_PLAY_TIME_MS = %f", this, playTime));
-
-    Telemetry::Accumulate(Telemetry::VIDEO_HIDDEN_PLAY_TIME_MS, SECONDS_TO_MS(hiddenPlayTime));
-    LOG(LogLevel::Debug, ("%p VIDEO_HIDDEN_PLAY_TIME_MS = %f", this, hiddenPlayTime));
-
-    if (playTime > 0.0) {
-      // We have actually played something -> Report some valid-video telemetry.
-
-      // Keyed by audio+video or video alone, and by a resolution range.
-      nsCString key(mMediaInfo.HasAudio() ? "AV," : "V,");
-      static const struct { int32_t mH; const char* mRes; } sResolutions[] = {
-        {  240, "0<h<=240" },
-        {  480, "240<h<=480" },
-        {  576, "480<h<=576" },
-        {  720, "576<h<=720" },
-        { 1080, "720<h<=1080" },
-        { 2160, "1080<h<=2160" }
-      };
-      const char* resolution = "h>2160";
-      int32_t height = mMediaInfo.mVideo.mImage.height;
-      for (const auto& res : sResolutions) {
-        if (height <= res.mH) {
-          resolution = res.mRes;
-          break;
-        }
-      }
-      key.AppendASCII(resolution);
-
-      uint32_t hiddenPercentage = uint32_t(hiddenPlayTime / playTime * 100.0 + 0.5);
-      Telemetry::Accumulate(Telemetry::VIDEO_HIDDEN_PLAY_TIME_PERCENTAGE,
-                            key,
-                            hiddenPercentage);
-      // Also accumulate all percentages in an "All" key.
-      Telemetry::Accumulate(Telemetry::VIDEO_HIDDEN_PLAY_TIME_PERCENTAGE,
-                            NS_LITERAL_CSTRING("All"),
-                            hiddenPercentage);
-      LOG(LogLevel::Debug, ("%p VIDEO_HIDDEN_PLAY_TIME_PERCENTAGE = %u, keys: '%s' and 'All'",
-                            this, hiddenPercentage, key.get()));
-
-      uint32_t videoDecodeSuspendPercentage =
-        uint32_t(videoDecodeSuspendTime / playTime * 100.0 + 0.5);
-      Telemetry::Accumulate(Telemetry::VIDEO_INFERRED_DECODE_SUSPEND_PERCENTAGE,
-                            key,
-                            videoDecodeSuspendPercentage);
-      Telemetry::Accumulate(Telemetry::VIDEO_INFERRED_DECODE_SUSPEND_PERCENTAGE,
-                            NS_LITERAL_CSTRING("All"),
-                            videoDecodeSuspendPercentage);
-      LOG(LogLevel::Debug, ("%p VIDEO_INFERRED_DECODE_SUSPEND_PERCENTAGE = %u, keys: '%s' and 'All'",
-                            this, videoDecodeSuspendPercentage, key.get()));
-
-      if (data.mInterKeyframeCount != 0) {
-        uint32_t average_ms =
-          uint32_t(std::min<uint64_t>(double(data.mInterKeyframeSum_us)
-                                      / double(data.mInterKeyframeCount)
-                                      / 1000.0
-                                      + 0.5,
-                                      UINT32_MAX));
-        Telemetry::Accumulate(Telemetry::VIDEO_INTER_KEYFRAME_AVERAGE_MS,
-                              key,
-                              average_ms);
-        Telemetry::Accumulate(Telemetry::VIDEO_INTER_KEYFRAME_AVERAGE_MS,
-                              NS_LITERAL_CSTRING("All"),
-                              average_ms);
-        LOG(LogLevel::Debug, ("%p VIDEO_INTER_KEYFRAME_AVERAGE_MS = %u, keys: '%s' and 'All'",
-                              this, average_ms, key.get()));
-
-        uint32_t max_ms =
-          uint32_t(std::min<uint64_t>((data.mInterKeyFrameMax_us + 500) / 1000,
-                                      UINT32_MAX));
-        Telemetry::Accumulate(Telemetry::VIDEO_INTER_KEYFRAME_MAX_MS,
-                              key,
-                              max_ms);
-        Telemetry::Accumulate(Telemetry::VIDEO_INTER_KEYFRAME_MAX_MS,
-                              NS_LITERAL_CSTRING("All"),
-                              max_ms);
-        LOG(LogLevel::Debug, ("%p VIDEO_INTER_KEYFRAME_MAX_MS = %u, keys: '%s' and 'All'",
-                              this, max_ms, key.get()));
-      } else {
-        // Here, we have played *some* of the video, but didn't get more than 1
-        // keyframe. Report '0' if we have played for longer than the video-
-        // decode-suspend delay (showing recovery would be difficult).
-        uint32_t suspendDelay_ms = MediaPrefs::MDSMSuspendBackgroundVideoDelay();
-        if (uint32_t(playTime * 1000.0) > suspendDelay_ms) {
-          Telemetry::Accumulate(Telemetry::VIDEO_INTER_KEYFRAME_MAX_MS,
-                                key,
-                                0);
-          Telemetry::Accumulate(Telemetry::VIDEO_INTER_KEYFRAME_MAX_MS,
-                                NS_LITERAL_CSTRING("All"),
-                                0);
-          LOG(LogLevel::Debug, ("%p VIDEO_INTER_KEYFRAME_MAX_MS = 0 (only 1 keyframe), keys: '%s' and 'All'",
-                                this, key.get()));
-        }
-      }
-    }
-  }
-}
-
 void HTMLMediaElement::UnbindFromTree(bool aDeep,
                                       bool aNullParent)
 {
@@ -5351,19 +5114,6 @@ nsresult HTMLMediaElement::DispatchAsyncEvent(const nsAString& aName)
   nsCOMPtr<nsIRunnable> event = new nsAsyncEventRunner(aName, this);
   NS_DispatchToMainThread(event);
 
-  if ((aName.EqualsLiteral("play") || aName.EqualsLiteral("playing"))) {
-    mPlayTime.Start();
-    if (IsHidden()) {
-      HiddenVideoStart();
-    }
-  } else if (aName.EqualsLiteral("waiting")) {
-    mPlayTime.Pause();
-    HiddenVideoStop();
-  } else if (aName.EqualsLiteral("pause")) {
-    mPlayTime.Pause();
-    HiddenVideoStop();
-  }
-
   return NS_OK;
 }
 
@@ -5489,11 +5239,6 @@ void HTMLMediaElement::SuspendOrResumeElement(bool aPauseElement, bool aSuspendE
     UpdateSrcMediaStreamPlaying();
     UpdateAudioChannelPlayingState();
     if (aPauseElement) {
-      ReportTelemetry();
-#ifdef MOZ_EME
-      ReportEMETelemetry();
-#endif
-
 #ifdef MOZ_EME
       // For EME content, we may force destruction of the CDM client (and CDM
       // instance if this is the last client for that CDM instance) and
@@ -5545,13 +5290,6 @@ bool HTMLMediaElement::IsBeingDestroyed()
 void HTMLMediaElement::NotifyOwnerDocumentActivityChanged()
 {
   bool visible = !IsHidden();
-  if (visible) {
-    // Visible -> Just pause hidden play time (no-op if already paused).
-    HiddenVideoStop();
-  } else if (mPlayTime.IsStarted()) {
-    // Not visible, play time is running -> Start hidden play time if needed.
-    HiddenVideoStart();
-  }
 
   if (mDecoder && !IsBeingDestroyed()) {
     mDecoder->NotifyOwnerActivityChanged(visible);
@@ -6327,18 +6065,10 @@ HTMLMediaElement::OnVisibilityChange(Visibility aNewVisibility)
         break;
     }
     case Visibility::APPROXIMATELY_NONVISIBLE: {
-      if (mPlayTime.IsStarted()) {
-        // Not visible, play time is running -> Start hidden play time if needed.
-        HiddenVideoStart();
-      }
-
       mDecoder->NotifyOwnerActivityChanged(false);
       break;
     }
     case Visibility::APPROXIMATELY_VISIBLE: {
-      // Visible -> Just pause hidden play time (no-op if already paused).
-      HiddenVideoStop();
-
       mDecoder->NotifyOwnerActivityChanged(true);
       break;
     }
@@ -6860,97 +6590,6 @@ HTMLMediaElement::MarkAsContentSource(CallerAPI aAPI)
 {
   const bool isVisible = mVisibilityState != Visibility::APPROXIMATELY_NONVISIBLE;
 
-  if (isVisible) {
-    // 0 = ALL_VISIBLE
-    Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE, 0);
-  } else {
-    // 1 = ALL_INVISIBLE
-    Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE, 1);
-
-    if (IsInUncomposedDoc()) {
-      // 0 = ALL_IN_TREE
-      Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE_IN_TREE_OR_NOT, 0);
-    } else {
-      // 1 = ALL_NOT_IN_TREE
-      Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE_IN_TREE_OR_NOT, 1);
-    }
-  }
-
-  switch (aAPI) {
-    case CallerAPI::DRAW_IMAGE: {
-      if (isVisible) {
-        // 2 = drawImage_VISIBLE
-        Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE, 2);
-      } else {
-        // 3 = drawImage_INVISIBLE
-        Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE, 3);
-
-        if (IsInUncomposedDoc()) {
-          // 2 = drawImage_IN_TREE
-          Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE_IN_TREE_OR_NOT, 2);
-        } else {
-          // 3 = drawImage_NOT_IN_TREE
-          Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE_IN_TREE_OR_NOT, 3);
-        }
-      }
-      break;
-    }
-    case CallerAPI::CREATE_PATTERN: {
-      if (isVisible) {
-        // 4 = createPattern_VISIBLE
-        Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE, 4);
-      } else {
-        // 5 = createPattern_INVISIBLE
-        Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE, 5);
-
-        if (IsInUncomposedDoc()) {
-          // 4 = createPattern_IN_TREE
-          Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE_IN_TREE_OR_NOT, 4);
-        } else {
-          // 5 = createPattern_NOT_IN_TREE
-          Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE_IN_TREE_OR_NOT, 5);
-        }
-      }
-      break;
-    }
-    case CallerAPI::CREATE_IMAGEBITMAP: {
-      if (isVisible) {
-        // 6 = createImageBitmap_VISIBLE
-        Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE, 6);
-      } else {
-        // 7 = createImageBitmap_INVISIBLE
-        Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE, 7);
-
-        if (IsInUncomposedDoc()) {
-          // 6 = createImageBitmap_IN_TREE
-          Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE_IN_TREE_OR_NOT, 6);
-        } else {
-          // 7 = createImageBitmap_NOT_IN_TREE
-          Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE_IN_TREE_OR_NOT, 7);
-        }
-      }
-      break;
-    }
-    case CallerAPI::CAPTURE_STREAM: {
-      if (isVisible) {
-        // 8 = captureStream_VISIBLE
-        Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE, 8);
-      } else {
-        // 9 = captureStream_INVISIBLE
-        Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE, 9);
-
-        if (IsInUncomposedDoc()) {
-          // 8 = captureStream_IN_TREE
-          Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE_IN_TREE_OR_NOT, 8);
-        } else {
-          // 9 = captureStream_NOT_IN_TREE
-          Telemetry::Accumulate(Telemetry::VIDEO_AS_CONTENT_SOURCE_IN_TREE_OR_NOT, 9);
-        }
-      }
-      break;
-    }
-  }
-
   LOG(LogLevel::Debug,
       ("%p Log VIDEO_AS_CONTENT_SOURCE: visibility = %u, API: '%d' and 'All'",
        this, isVisible, aAPI));
diff --git a/dom/html/HTMLMediaElement.h b/dom/html/HTMLMediaElement.h
index af944a318..899e8449a 100644
--- a/dom/html/HTMLMediaElement.h
+++ b/dom/html/HTMLMediaElement.h
@@ -1195,29 +1195,6 @@ protected:
     return isPaused;
   }
 
-  /**
-   * Video has been playing while hidden and, if feature was enabled, would
-   * trigger suspending decoder.
-   * Used to track hidden-video-decode-suspend telemetry.
-   */
-  static void VideoDecodeSuspendTimerCallback(nsITimer* aTimer, void* aClosure);
-  /**
-   * Video is now both: playing and hidden.
-   * Used to track hidden-video telemetry.
-   */
-  void HiddenVideoStart();
-  /**
-   * Video is not playing anymore and/or has become visible.
-   * Used to track hidden-video telemetry.
-   */
-  void HiddenVideoStop();
-
-#ifdef MOZ_EME
-  void ReportEMETelemetry();
-#endif
-
-  void ReportTelemetry();
-
   // Check the permissions for audiochannel.
   bool CheckAudioChannelPermissions(const nsAString& aType);
 
@@ -1484,9 +1461,6 @@ protected:
   // Timer used for updating progress events.
   nsCOMPtr<nsITimer> mProgressTimer;
 
-  // Timer used to simulate video-suspend.
-  nsCOMPtr<nsITimer> mVideoDecodeSuspendTimer;
-
 #ifdef MOZ_EME
   // Encrypted Media Extension media keys.
   RefPtr<MediaKeys> mMediaKeys;
@@ -1688,65 +1662,7 @@ protected:
   // before attaching to the DOM tree.
   bool mUnboundFromTree = false;
 
-public:
-  // Helper class to measure times for MSE telemetry stats
-  class TimeDurationAccumulator
-  {
-  public:
-    TimeDurationAccumulator()
-      : mCount(0)
-    {}
-    void Start()
-    {
-      if (IsStarted()) {
-        return;
-      }
-      mStartTime = TimeStamp::Now();
-    }
-    void Pause()
-    {
-      if (!IsStarted()) {
-        return;
-      }
-      mSum += (TimeStamp::Now() - mStartTime);
-      mCount++;
-      mStartTime = TimeStamp();
-    }
-    bool IsStarted() const
-    {
-      return !mStartTime.IsNull();
-    }
-    double Total() const
-    {
-      if (!IsStarted()) {
-        return mSum.ToSeconds();
-      }
-      // Add current running time until now, but keep it running.
-      return (mSum + (TimeStamp::Now() - mStartTime)).ToSeconds();
-    }
-    uint32_t Count() const
-    {
-      if (!IsStarted()) {
-        return mCount;
-      }
-      // Count current run in this report, without increasing the stored count.
-      return mCount + 1;
-    }
-  private:
-    TimeStamp mStartTime;
-    TimeDuration mSum;
-    uint32_t mCount;
-  };
 private:
-  // Total time a video has spent playing.
-  TimeDurationAccumulator mPlayTime;
-
-  // Total time a video has spent playing while hidden.
-  TimeDurationAccumulator mHiddenPlayTime;
-
-  // Total time a video has (or would have) spent in video-decode-suspend mode.
-  TimeDurationAccumulator mVideoDecodeSuspendTime;
-
   // Indicates if user has interacted with the element.
   // Used to block autoplay when disabled.
   bool mHasUserInteraction;
diff --git a/dom/html/HTMLOptionsCollection.cpp b/dom/html/HTMLOptionsCollection.cpp
index 294493c0c..67de97fc4 100644
--- a/dom/html/HTMLOptionsCollection.cpp
+++ b/dom/html/HTMLOptionsCollection.cpp
@@ -35,23 +35,8 @@ namespace mozilla {
 namespace dom {
 
 HTMLOptionsCollection::HTMLOptionsCollection(HTMLSelectElement* aSelect)
-{
-  // Do not maintain a reference counted reference. When
-  // the select goes away, it will let us know.
-  mSelect = aSelect;
-}
-
-HTMLOptionsCollection::~HTMLOptionsCollection()
-{
-  DropReference();
-}
-
-void
-HTMLOptionsCollection::DropReference()
-{
-  // Drop our (non ref-counted) reference
-  mSelect = nullptr;
-}
+  : mSelect(aSelect)
+{}
 
 nsresult
 HTMLOptionsCollection::GetOptionIndex(Element* aOption,
@@ -88,7 +73,9 @@ HTMLOptionsCollection::GetOptionIndex(Element* aOption,
 }
 
 
-NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(HTMLOptionsCollection, mElements)
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(HTMLOptionsCollection,
+                                      mElements,
+                                      mSelect)
 
 // nsISupports
 
@@ -124,10 +111,6 @@ HTMLOptionsCollection::GetLength(uint32_t* aLength)
 NS_IMETHODIMP
 HTMLOptionsCollection::SetLength(uint32_t aLength)
 {
-  if (!mSelect) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
   return mSelect->SetLength(aLength);
 }
 
@@ -135,10 +118,6 @@ NS_IMETHODIMP
 HTMLOptionsCollection::SetOption(uint32_t aIndex,
                                  nsIDOMHTMLOptionElement* aOption)
 {
-  if (!mSelect) {
-    return NS_OK;
-  }
-
   // if the new option is null, just remove this option.  Note that it's safe
   // to pass a too-large aIndex in here.
   if (!aOption) {
@@ -187,11 +166,6 @@ HTMLOptionsCollection::SetOption(uint32_t aIndex,
 int32_t
 HTMLOptionsCollection::GetSelectedIndex(ErrorResult& aError)
 {
-  if (!mSelect) {
-    aError.Throw(NS_ERROR_UNEXPECTED);
-    return 0;
-  }
-
   int32_t selectedIndex;
   aError = mSelect->GetSelectedIndex(&selectedIndex);
   return selectedIndex;
@@ -209,11 +183,6 @@ void
 HTMLOptionsCollection::SetSelectedIndex(int32_t aSelectedIndex,
                                         ErrorResult& aError)
 {
-  if (!mSelect) {
-    aError.Throw(NS_ERROR_UNEXPECTED);
-    return;
-  }
-
   aError = mSelect->SetSelectedIndex(aSelectedIndex);
 }
 
@@ -339,22 +308,12 @@ HTMLOptionsCollection::Add(const HTMLOptionOrOptGroupElement& aElement,
                            const Nullable<HTMLElementOrLong>& aBefore,
                            ErrorResult& aError)
 {
-  if (!mSelect) {
-    aError.Throw(NS_ERROR_NOT_INITIALIZED);
-    return;
-  }
-
   mSelect->Add(aElement, aBefore, aError);
 }
 
 void
 HTMLOptionsCollection::Remove(int32_t aIndex, ErrorResult& aError)
 {
-  if (!mSelect) {
-    aError.Throw(NS_ERROR_UNEXPECTED);
-    return;
-  }
-
   uint32_t len = 0;
   mSelect->GetLength(&len);
   if (aIndex < 0 || (uint32_t)aIndex >= len)
diff --git a/dom/html/HTMLOptionsCollection.h b/dom/html/HTMLOptionsCollection.h
index 21123b3d2..496919555 100644
--- a/dom/html/HTMLOptionsCollection.h
+++ b/dom/html/HTMLOptionsCollection.h
@@ -46,7 +46,7 @@ public:
   using nsWrapperCache::GetWrapper;
   virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
 protected:
-  virtual ~HTMLOptionsCollection();
+  virtual ~HTMLOptionsCollection() = default;
 
   virtual JSObject* GetWrapperPreserveColorInternal() override
   {
@@ -113,11 +113,6 @@ public:
   }
 
   /**
-   * Drop the reference to the select.  Called during select destruction.
-   */
-  void DropReference();
-
-  /**
    * Finds the index of a given option element.
    * If the option isn't part of the collection, return NS_ERROR_FAILURE
    * without setting aIndex.
@@ -161,7 +156,7 @@ private:
    * various members such as InsertOptionAt are also infallible. */
   nsTArray<RefPtr<mozilla::dom::HTMLOptionElement> > mElements;
   /** The select element that contains this array */
-  HTMLSelectElement* mSelect;
+  RefPtr<HTMLSelectElement> mSelect;
 };
 
 } // namespace dom
diff --git a/dom/html/HTMLSelectElement.cpp b/dom/html/HTMLSelectElement.cpp
index 53f42317a..9ba0a1efe 100644
--- a/dom/html/HTMLSelectElement.cpp
+++ b/dom/html/HTMLSelectElement.cpp
@@ -130,11 +130,6 @@ HTMLSelectElement::HTMLSelectElement(already_AddRefed<mozilla::dom::NodeInfo>& a
                     NS_EVENT_STATE_VALID);
 }
 
-HTMLSelectElement::~HTMLSelectElement()
-{
-  mOptions->DropReference();
-}
-
 // ISupports
 
 NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLSelectElement)
diff --git a/dom/html/HTMLSelectElement.h b/dom/html/HTMLSelectElement.h
index 8a25385de..dc1075cd7 100644
--- a/dom/html/HTMLSelectElement.h
+++ b/dom/html/HTMLSelectElement.h
@@ -436,7 +436,7 @@ public:
   void SetOpenInParentProcess(bool aVal);
 
 protected:
-  virtual ~HTMLSelectElement();
+  virtual ~HTMLSelectElement() = default;
 
   friend class SafeOptionListMutation;
 
diff --git a/dom/html/HTMLTableElement.cpp b/dom/html/HTMLTableElement.cpp
index ec1b7cecb..c5b7696cf 100644
--- a/dom/html/HTMLTableElement.cpp
+++ b/dom/html/HTMLTableElement.cpp
@@ -421,11 +421,10 @@ HTMLTableElement::CreateTHead()
 void
 HTMLTableElement::DeleteTHead()
 {
-  HTMLTableSectionElement* tHead = GetTHead();
+  RefPtr<HTMLTableSectionElement> tHead = GetTHead();
   if (tHead) {
-    mozilla::ErrorResult rv;
+    mozilla::IgnoredErrorResult rv;
     nsINode::RemoveChild(*tHead, rv);
-    MOZ_ASSERT(!rv.Failed());
   }
 }
 
@@ -452,11 +451,10 @@ HTMLTableElement::CreateTFoot()
 void
 HTMLTableElement::DeleteTFoot()
 {
-  HTMLTableSectionElement* tFoot = GetTFoot();
+  RefPtr<HTMLTableSectionElement> tFoot = GetTFoot();
   if (tFoot) {
-    mozilla::ErrorResult rv;
+    mozilla::IgnoredErrorResult rv;
     nsINode::RemoveChild(*tFoot, rv);
-    MOZ_ASSERT(!rv.Failed());
   }
 }
 
@@ -483,11 +481,10 @@ HTMLTableElement::CreateCaption()
 void
 HTMLTableElement::DeleteCaption()
 {
-  HTMLTableCaptionElement* caption = GetCaption();
+  RefPtr<HTMLTableCaptionElement> caption = GetCaption();
   if (caption) {
-    mozilla::ErrorResult rv;
+    mozilla::IgnoredErrorResult rv;
     nsINode::RemoveChild(*caption, rv);
-    MOZ_ASSERT(!rv.Failed());
   }
 }
 
diff --git a/dom/html/HTMLTableSectionElement.cpp b/dom/html/HTMLTableSectionElement.cpp
index c7b0665dd..e99597636 100644
--- a/dom/html/HTMLTableSectionElement.cpp
+++ b/dom/html/HTMLTableSectionElement.cpp
@@ -122,7 +122,7 @@ HTMLTableSectionElement::DeleteRow(int32_t aValue, ErrorResult& aError)
     refIndex = (uint32_t)aValue;
   }
 
-  nsINode* row = rows->Item(refIndex);
+  nsCOMPtr<nsINode> row = rows->Item(refIndex);
   if (!row) {
     aError.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
     return;
diff --git a/dom/html/ImageDocument.cpp b/dom/html/ImageDocument.cpp
index 200bb5d46..f83a804be 100644
--- a/dom/html/ImageDocument.cpp
+++ b/dom/html/ImageDocument.cpp
@@ -40,12 +40,14 @@
 #include "nsThreadUtils.h"
 #include "nsIScrollableFrame.h"
 #include "nsContentUtils.h"
+#include "nsCSSParser.h" // for CSS colors on the background
 #include "mozilla/dom/Element.h"
 #include "mozilla/Preferences.h"
 #include <algorithm>
 
 #define AUTOMATIC_IMAGE_RESIZING_PREF "browser.enable_automatic_image_resizing"
 #define CLICK_IMAGE_RESIZING_PREF "browser.enable_click_image_resizing"
+#define STANDALONE_IMAGE_BACKGROUND_COLOR_PREF "browser.display.standalone_images.background_color"
 //XXX A hack needed for Firefox's site specific zoom.
 #define SITE_SPECIFIC_ZOOM "browser.zoom.siteSpecific"
 
@@ -170,6 +172,8 @@ ImageDocument::Init()
   mClickResizingEnabled = Preferences::GetBool(CLICK_IMAGE_RESIZING_PREF);
   mShouldResize = mResizeImageByDefault;
   mFirstResize = true;
+  
+  mBackgroundColor = Preferences::GetString(STANDALONE_IMAGE_BACKGROUND_COLOR_PREF);
 
   return NS_OK;
 }
@@ -682,9 +686,22 @@ ImageDocument::CreateSyntheticDocument()
   mImageContent->SetAttr(kNameSpaceID_None, nsGkAtoms::src, srcString, false);
   mImageContent->SetAttr(kNameSpaceID_None, nsGkAtoms::alt, srcString, false);
 
+  // Implement mechanism for custom background color from pref.
+  if (!mBackgroundColor.IsEmpty()) {
+    nsCSSValue color;
+    nsCSSParser parser;
+    if (parser.ParseColorString(mBackgroundColor, nullptr, 0, color)) {
+      nsAutoString styleAttr(NS_LITERAL_STRING("background-color: "));
+      styleAttr.Append(mBackgroundColor);
+      body->SetAttr(kNameSpaceID_None, nsGkAtoms::style, styleAttr, false);
+    }
+  }
+
   body->AppendChildTo(mImageContent, false);
   imageLoader->SetLoadingEnabled(true);
 
+  UpdateTitleAndCharset();
+  
   return NS_OK;
 }
 
diff --git a/dom/html/ImageDocument.h b/dom/html/ImageDocument.h
index fdf2a00a8..945317314 100644
--- a/dom/html/ImageDocument.h
+++ b/dom/html/ImageDocument.h
@@ -112,6 +112,9 @@ protected:
   float                         mVisibleHeight;
   int32_t                       mImageWidth;
   int32_t                       mImageHeight;
+  
+  // Holds the custom background color for stand-alone images
+  nsAutoString                  mBackgroundColor;
 
   bool                          mResizeImageByDefault;
   bool                          mClickResizingEnabled;
diff --git a/dom/html/TextTrackManager.cpp b/dom/html/TextTrackManager.cpp
index 8110dab29..7f9d32794 100644
--- a/dom/html/TextTrackManager.cpp
+++ b/dom/html/TextTrackManager.cpp
@@ -12,7 +12,6 @@
 #include "mozilla/dom/TextTrackCue.h"
 #include "mozilla/dom/Event.h"
 #include "mozilla/ClearOnShutdown.h"
-#include "mozilla/Telemetry.h"
 #include "nsComponentManagerUtils.h"
 #include "nsVariant.h"
 #include "nsVideoFrame.h"
@@ -30,6 +29,13 @@ namespace dom {
 
 NS_IMPL_ISUPPORTS(TextTrackManager::ShutdownObserverProxy, nsIObserver);
 
+void
+TextTrackManager::ShutdownObserverProxy::Unregister()
+{
+  nsContentUtils::UnregisterShutdownObserver(this);
+  mManager = nullptr;
+}
+
 CompareTextTracks::CompareTextTracks(HTMLMediaElement* aMediaElement)
 {
   mMediaElement = aMediaElement;
@@ -112,7 +118,6 @@ TextTrackManager::TextTrackManager(HTMLMediaElement *aMediaElement)
   , mTimeMarchesOnDispatched(false)
   , mUpdateCueDisplayDispatched(false)
   , performedTrackSelection(false)
-  , mCueTelemetryReported(false)
   , mShutdown(false)
 {
   nsISupports* parentObject =
@@ -138,7 +143,7 @@ TextTrackManager::TextTrackManager(HTMLMediaElement *aMediaElement)
 TextTrackManager::~TextTrackManager()
 {
   WEBVTT_LOG("%p ~TextTrackManager",this);
-  nsContentUtils::UnregisterShutdownObserver(mShutdownProxy);
+  mShutdownProxy->Unregister();
 }
 
 TextTrackList*
@@ -164,7 +169,6 @@ TextTrackManager::AddTextTrack(TextTrackKind aKind, const nsAString& aLabel,
     mTextTracks->AddTextTrack(aKind, aLabel, aLanguage, aMode, aReadyState,
                               aTextTrackSource, CompareTextTracks(mMediaElement));
   AddCues(track);
-  ReportTelemetryForTrack(track);
 
   if (aTextTrackSource == TextTrackSource::Track) {
     RefPtr<nsIRunnable> task =
@@ -184,7 +188,6 @@ TextTrackManager::AddTextTrack(TextTrack* aTextTrack)
   WEBVTT_LOG("%p AddTextTrack TextTrack %p",this, aTextTrack);
   mTextTracks->AddTextTrack(aTextTrack, CompareTextTracks(mMediaElement));
   AddCues(aTextTrack);
-  ReportTelemetryForTrack(aTextTrack);
 
   if (aTextTrack->GetTextTrackSource() == TextTrackSource::Track) {
     RefPtr<nsIRunnable> task =
@@ -303,7 +306,6 @@ TextTrackManager::NotifyCueAdded(TextTrackCue& aCue)
     mNewCues->AddCue(aCue);
   }
   DispatchTimeMarchesOn();
-  ReportTelemetryForCue();
 }
 
 void
@@ -821,28 +823,5 @@ TextTrackManager::NotifyReset()
   mLastTimeMarchesOnCalled = 0.0;
 }
 
-void
-TextTrackManager::ReportTelemetryForTrack(TextTrack* aTextTrack) const
-{
-  MOZ_ASSERT(NS_IsMainThread());
-  MOZ_ASSERT(aTextTrack);
-  MOZ_ASSERT(mTextTracks->Length() > 0);
-
-  TextTrackKind kind = aTextTrack->Kind();
-  Telemetry::Accumulate(Telemetry::WEBVTT_TRACK_KINDS, uint32_t(kind));
-}
-
-void
-TextTrackManager::ReportTelemetryForCue()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-  MOZ_ASSERT(!mNewCues->IsEmpty() || !mLastActiveCues->IsEmpty());
-
-  if (!mCueTelemetryReported) {
-    Telemetry::Accumulate(Telemetry::WEBVTT_USED_VTT_CUES, 1);
-    mCueTelemetryReported = true;
-  }
-}
-
 } // namespace dom
 } // namespace mozilla
diff --git a/dom/html/TextTrackManager.h b/dom/html/TextTrackManager.h
index d20707346..2375aa4bb 100644
--- a/dom/html/TextTrackManager.h
+++ b/dom/html/TextTrackManager.h
@@ -148,13 +148,6 @@ private:
                            nsTArray<TextTrack*>& aTextTracks);
   bool TrackIsDefault(TextTrack* aTextTrack);
 
-  void ReportTelemetryForTrack(TextTrack* aTextTrack) const;
-  void ReportTelemetryForCue();
-
-  // If there is at least one cue has been added to the cue list once, we would
-  // report the usage of cue to Telemetry.
-  bool mCueTelemetryReported;
-
   class ShutdownObserverProxy final : public nsIObserver
   {
     NS_DECL_ISUPPORTS
@@ -170,11 +163,15 @@ private:
     {
       MOZ_ASSERT(NS_IsMainThread());
       if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
-        nsContentUtils::UnregisterShutdownObserver(this);
-        mManager->NotifyShutdown();
+        if (mManager) {
+          mManager->NotifyShutdown();
+        }
+        Unregister();
       }
       return NS_OK;
     }
+    
+    void Unregister();
 
   private:
     ~ShutdownObserverProxy() {};
diff --git a/dom/html/nsDOMStringMap.cpp b/dom/html/nsDOMStringMap.cpp
index 42725bc6f..6d2bc424d 100644
--- a/dom/html/nsDOMStringMap.cpp
+++ b/dom/html/nsDOMStringMap.cpp
@@ -19,7 +19,6 @@ using namespace mozilla::dom;
 NS_IMPL_CYCLE_COLLECTION_CLASS(nsDOMStringMap)
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMStringMap)
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
diff --git a/dom/html/nsGenericHTMLElement.h b/dom/html/nsGenericHTMLElement.h
index 0635c27e1..24a7a3652 100644
--- a/dom/html/nsGenericHTMLElement.h
+++ b/dom/html/nsGenericHTMLElement.h
@@ -396,13 +396,6 @@ public:
   }
   NS_IMETHOD InsertAdjacentHTML(const nsAString& position,
                                 const nsAString& text) final override;
-  NS_IMETHOD ScrollIntoView(bool top, uint8_t _argc) final override {
-    if (!_argc) {
-      top = true;
-    }
-    mozilla::dom::Element::ScrollIntoView(top);
-    return NS_OK;
-  }
   NS_IMETHOD GetOffsetParent(nsIDOMElement** aOffsetParent)
     final override {
     mozilla::dom::Element* offsetParent = GetOffsetParent();
diff --git a/dom/html/nsTextEditorState.cpp b/dom/html/nsTextEditorState.cpp
index 187afb66d..25be6016c 100644
--- a/dom/html/nsTextEditorState.cpp
+++ b/dom/html/nsTextEditorState.cpp
@@ -47,7 +47,6 @@
 #include "mozilla/dom/HTMLInputElement.h"
 #include "nsNumberControlFrame.h"
 #include "nsFrameSelection.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/layers/ScrollInputMethods.h"
 
 using namespace mozilla;
@@ -585,9 +584,6 @@ nsTextInputSelectionImpl::CompleteScroll(bool aForward)
   if (!mScrollFrame)
     return NS_ERROR_NOT_INITIALIZED;
 
-  mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
-      (uint32_t) ScrollInputMethod::MainThreadCompleteScroll);
-
   mScrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
                          nsIScrollableFrame::WHOLE,
                          nsIScrollableFrame::INSTANT);
@@ -640,9 +636,6 @@ nsTextInputSelectionImpl::ScrollPage(bool aForward)
   if (!mScrollFrame)
     return NS_ERROR_NOT_INITIALIZED;
 
-  mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
-      (uint32_t) ScrollInputMethod::MainThreadScrollPage);
-
   mScrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
                          nsIScrollableFrame::PAGES,
                          nsIScrollableFrame::SMOOTH);
@@ -655,9 +648,6 @@ nsTextInputSelectionImpl::ScrollLine(bool aForward)
   if (!mScrollFrame)
     return NS_ERROR_NOT_INITIALIZED;
 
-  mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
-      (uint32_t) ScrollInputMethod::MainThreadScrollLine);
-
   mScrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
                          nsIScrollableFrame::LINES,
                          nsIScrollableFrame::SMOOTH);
@@ -670,9 +660,6 @@ nsTextInputSelectionImpl::ScrollCharacter(bool aRight)
   if (!mScrollFrame)
     return NS_ERROR_NOT_INITIALIZED;
 
-  mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
-      (uint32_t) ScrollInputMethod::MainThreadScrollCharacter);
-
   mScrollFrame->ScrollBy(nsIntPoint(aRight ? 1 : -1, 0),
                          nsIScrollableFrame::LINES,
                          nsIScrollableFrame::SMOOTH);
@@ -2268,7 +2255,11 @@ nsTextEditorState::UpdatePlaceholderText(bool aNotify)
 
   nsCOMPtr<nsIContent> content = do_QueryInterface(mTextCtrlElement);
   content->GetAttr(kNameSpaceID_None, nsGkAtoms::placeholder, placeholderValue);
-  nsContentUtils::RemoveNewlines(placeholderValue);
+  if (mTextCtrlElement->IsTextArea()) { // <textarea>s preserve newlines...
+    nsContentUtils::PlatformToDOMLineBreaks(placeholderValue);
+  } else { // ...<input>s don't
+    nsContentUtils::RemoveNewlines(placeholderValue);
+  }
   NS_ASSERTION(mPlaceholderDiv->GetFirstChild(), "placeholder div has no child");
   mPlaceholderDiv->GetFirstChild()->SetText(placeholderValue, aNotify);
 }
diff --git a/dom/indexedDB/ActorsChild.cpp b/dom/indexedDB/ActorsChild.cpp
index 3e8f97348..c4fcceb90 100644
--- a/dom/indexedDB/ActorsChild.cpp
+++ b/dom/indexedDB/ActorsChild.cpp
@@ -3456,6 +3456,8 @@ BackgroundCursorChild::RecvResponse(const CursorResponse& aResponse)
 
   RefPtr<IDBCursor> cursor;
   mStrongCursor.swap(cursor);
+  
+  RefPtr<IDBTransaction> transaction = mTransaction;
 
   switch (aResponse.type()) {
     case CursorResponse::Tnsresult:
@@ -3486,7 +3488,7 @@ BackgroundCursorChild::RecvResponse(const CursorResponse& aResponse)
       MOZ_CRASH("Should never get here!");
   }
 
-  mTransaction->OnRequestFinished(/* aActorDestroyedNormally */ true);
+  transaction->OnRequestFinished(/* aActorDestroyedNormally */ true);
 
   return true;
 }
diff --git a/dom/indexedDB/ActorsParent.cpp b/dom/indexedDB/ActorsParent.cpp
index e6fe9e2a8..38621cee3 100644
--- a/dom/indexedDB/ActorsParent.cpp
+++ b/dom/indexedDB/ActorsParent.cpp
@@ -23,6 +23,7 @@
 #include "mozilla/AppProcessChecker.h"
 #include "mozilla/AutoRestore.h"
 #include "mozilla/Casting.h"
+#include "mozilla/CheckedInt.h"
 #include "mozilla/EndianUtils.h"
 #include "mozilla/ErrorNames.h"
 #include "mozilla/LazyIdleThread.h"
@@ -249,8 +250,6 @@ const char kSQLiteJournalSuffix[] = ".sqlite-journal";
 const char kSQLiteSHMSuffix[] = ".sqlite-shm";
 const char kSQLiteWALSuffix[] = ".sqlite-wal";
 
-const char kPrefIndexedDBEnabled[] = "dom.indexedDB.enabled";
-
 const char kPrefFileHandleEnabled[] = "dom.fileHandle.enabled";
 
 #define IDB_PREFIX "indexedDB"
@@ -784,29 +783,25 @@ MakeCompressedIndexDataValues(
 
     MOZ_ASSERT(!keyBuffer.IsEmpty());
 
-    // Don't let |infoLength| overflow.
-    if (NS_WARN_IF(UINT32_MAX - keyBuffer.Length() <
-                   CompressedByteCountForIndexId(info.mIndexId) +
-                   CompressedByteCountForNumber(keyBufferLength) +
-                   CompressedByteCountForNumber(sortKeyBufferLength))) {
-      IDB_REPORT_INTERNAL_ERR();
-      return NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;
-    }
-
-    const uint32_t infoLength =
-      CompressedByteCountForIndexId(info.mIndexId) +
+    const CheckedUint32 infoLength =
+      CheckedUint32(CompressedByteCountForIndexId(info.mIndexId)) +
       CompressedByteCountForNumber(keyBufferLength) +
       CompressedByteCountForNumber(sortKeyBufferLength) +
       keyBufferLength +
       sortKeyBufferLength;
+    // Don't let |infoLength| overflow.
+    if (NS_WARN_IF(!infoLength.isValid())) {
+      IDB_REPORT_INTERNAL_ERR();
+      return NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;
+    }
 
     // Don't let |blobDataLength| overflow.
-    if (NS_WARN_IF(UINT32_MAX - infoLength < blobDataLength)) {
+    if (NS_WARN_IF(UINT32_MAX - infoLength.value() < blobDataLength)) {
       IDB_REPORT_INTERNAL_ERR();
       return NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;
     }
 
-    blobDataLength += infoLength;
+    blobDataLength += infoLength.value();
   }
 
   UniqueFreePtr<uint8_t> blobData(
@@ -4134,7 +4129,6 @@ GetDatabaseFileURL(nsIFile* aDatabaseFile,
                    PersistenceType aPersistenceType,
                    const nsACString& aGroup,
                    const nsACString& aOrigin,
-                   uint32_t aTelemetryId,
                    nsIFileURL** aResult)
 {
   MOZ_ASSERT(aDatabaseFile);
@@ -4166,18 +4160,10 @@ GetDatabaseFileURL(nsIFile* aDatabaseFile,
   nsAutoCString type;
   PersistenceTypeToText(aPersistenceType, type);
 
-  nsAutoCString telemetryFilenameClause;
-  if (aTelemetryId) {
-    telemetryFilenameClause.AssignLiteral("&telemetryFilename=indexedDB-");
-    telemetryFilenameClause.AppendInt(aTelemetryId);
-    telemetryFilenameClause.AppendLiteral(".sqlite");
-  }
-
   rv = fileUrl->SetQuery(NS_LITERAL_CSTRING("persistenceType=") + type +
                          NS_LITERAL_CSTRING("&group=") + aGroup +
                          NS_LITERAL_CSTRING("&origin=") + aOrigin +
-                         NS_LITERAL_CSTRING("&cache=private") +
-                         telemetryFilenameClause);
+                         NS_LITERAL_CSTRING("&cache=private"));
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }
@@ -4427,7 +4413,6 @@ CreateStorageConnection(nsIFile* aDBFile,
                         PersistenceType aPersistenceType,
                         const nsACString& aGroup,
                         const nsACString& aOrigin,
-                        uint32_t aTelemetryId,
                         mozIStorageConnection** aConnection)
 {
   AssertIsOnIOThread();
@@ -4459,7 +4444,6 @@ CreateStorageConnection(nsIFile* aDBFile,
                           aPersistenceType,
                           aGroup,
                           aOrigin,
-                          aTelemetryId,
                           getter_AddRefs(dbFileUrl));
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
@@ -4895,7 +4879,6 @@ GetStorageConnection(nsIFile* aDatabaseFile,
                      PersistenceType aPersistenceType,
                      const nsACString& aGroup,
                      const nsACString& aOrigin,
-                     uint32_t aTelemetryId,
                      mozIStorageConnection** aConnection)
 {
   MOZ_ASSERT(!NS_IsMainThread());
@@ -4923,7 +4906,6 @@ GetStorageConnection(nsIFile* aDatabaseFile,
                           aPersistenceType,
                           aGroup,
                           aOrigin,
-                          aTelemetryId,
                           getter_AddRefs(dbFileUrl));
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
@@ -4960,7 +4942,6 @@ GetStorageConnection(const nsAString& aDatabaseFilePath,
                      PersistenceType aPersistenceType,
                      const nsACString& aGroup,
                      const nsACString& aOrigin,
-                     uint32_t aTelemetryId,
                      mozIStorageConnection** aConnection)
 {
   MOZ_ASSERT(!NS_IsMainThread());
@@ -4979,7 +4960,6 @@ GetStorageConnection(const nsAString& aDatabaseFilePath,
                               aPersistenceType,
                               aGroup,
                               aOrigin,
-                              aTelemetryId,
                               aConnection);
 }
 
@@ -6301,7 +6281,6 @@ private:
   const nsCString mId;
   const nsString mFilePath;
   uint32_t mActiveMutableFileCount;
-  const uint32_t mTelemetryId;
   const PersistenceType mPersistenceType;
   const bool mFileHandleDisabled;
   const bool mChromeWriteAccessAllowed;
@@ -6318,7 +6297,6 @@ public:
            const Maybe<ContentParentId>& aOptionalContentParentId,
            const nsACString& aGroup,
            const nsACString& aOrigin,
-           uint32_t aTelemetryId,
            FullDatabaseMetadata* aMetadata,
            FileManager* aFileManager,
            already_AddRefed<DirectoryLock> aDirectoryLock,
@@ -6377,12 +6355,6 @@ public:
     return mId;
   }
 
-  uint32_t
-  TelemetryId() const
-  {
-    return mTelemetryId;
-  }
-
   PersistenceType
   Type() const
   {
@@ -7678,8 +7650,6 @@ class OpenDatabaseOp final
   // cycles.
   VersionChangeOp* mVersionChangeOp;
 
-  uint32_t mTelemetryId;
-
 public:
   OpenDatabaseOp(Factory* aFactory,
                  already_AddRefed<ContentParent> aContentParent,
@@ -10307,13 +10277,6 @@ typedef nsDataHashtable<nsIDHashKey, DatabaseLoggingInfo*>
 
 StaticAutoPtr<DatabaseLoggingInfoHashtable> gLoggingInfoHashtable;
 
-typedef nsDataHashtable<nsUint32HashKey, uint32_t> TelemetryIdHashtable;
-
-StaticAutoPtr<TelemetryIdHashtable> gTelemetryIdHashtable;
-
-// Protects all reads and writes to gTelemetryIdHashtable.
-StaticAutoPtr<Mutex> gTelemetryIdMutex;
-
 #ifdef DEBUG
 
 StaticRefPtr<DEBUGThreadSlower> gDEBUGThreadSlower;
@@ -10409,88 +10372,6 @@ DecreaseBusyCount()
   }
 }
 
-uint32_t
-TelemetryIdForFile(nsIFile* aFile)
-{
-  // May be called on any thread!
-
-  MOZ_ASSERT(aFile);
-  MOZ_ASSERT(gTelemetryIdMutex);
-
-  // The storage directory is structured like this:
-  //
-  //   <profile>/storage/<persistence>/<origin>/idb/<filename>.sqlite
-  //
-  // For the purposes of this function we're only concerned with the
-  // <persistence>, <origin>, and <filename> pieces.
-
-  nsString filename;
-  MOZ_ALWAYS_SUCCEEDS(aFile->GetLeafName(filename));
-
-  // Make sure we were given a database file.
-  NS_NAMED_LITERAL_STRING(sqliteExtension, ".sqlite");
-
-  MOZ_ASSERT(StringEndsWith(filename, sqliteExtension));
-
-  filename.Truncate(filename.Length() - sqliteExtension.Length());
-
-  // Get the "idb" directory.
-  nsCOMPtr<nsIFile> idbDirectory;
-  MOZ_ALWAYS_SUCCEEDS(aFile->GetParent(getter_AddRefs(idbDirectory)));
-
-  DebugOnly<nsString> idbLeafName;
-  MOZ_ASSERT(NS_SUCCEEDED(idbDirectory->GetLeafName(idbLeafName)));
-  MOZ_ASSERT(static_cast<nsString&>(idbLeafName).EqualsLiteral("idb"));
-
-  // Get the <origin> directory.
-  nsCOMPtr<nsIFile> originDirectory;
-  MOZ_ALWAYS_SUCCEEDS(
-    idbDirectory->GetParent(getter_AddRefs(originDirectory)));
-
-  nsString origin;
-  MOZ_ALWAYS_SUCCEEDS(originDirectory->GetLeafName(origin));
-
-  // Any databases in these directories are owned by the application and should
-  // not have their filenames masked. Hopefully they also appear in the
-  // Telemetry.cpp whitelist.
-  if (origin.EqualsLiteral("chrome") ||
-      origin.EqualsLiteral("moz-safe-about+home")) {
-    return 0;
-  }
-
-  // Get the <persistence> directory.
-  nsCOMPtr<nsIFile> persistenceDirectory;
-  MOZ_ALWAYS_SUCCEEDS(
-    originDirectory->GetParent(getter_AddRefs(persistenceDirectory)));
-
-  nsString persistence;
-  MOZ_ALWAYS_SUCCEEDS(persistenceDirectory->GetLeafName(persistence));
-
-  NS_NAMED_LITERAL_STRING(separator, "*");
-
-  uint32_t hashValue = HashString(persistence + separator +
-                                  origin + separator +
-                                  filename);
-
-  MutexAutoLock lock(*gTelemetryIdMutex);
-
-  if (!gTelemetryIdHashtable) {
-    gTelemetryIdHashtable = new TelemetryIdHashtable();
-  }
-
-  uint32_t id;
-  if (!gTelemetryIdHashtable->Get(hashValue, &id)) {
-    static uint32_t sNextId = 1;
-
-    // We're locked, no need for atomics.
-    id = sNextId++;
-
-    gTelemetryIdHashtable->Put(hashValue, id);
-  }
-
-  return id;
-}
-
 } // namespace
 
 /*******************************************************************************
@@ -12270,7 +12151,6 @@ ConnectionPool::GetOrCreateConnection(const Database* aDatabase,
                            aDatabase->Type(),
                            aDatabase->Group(),
                            aDatabase->Origin(),
-                           aDatabase->TelemetryId(),
                            getter_AddRefs(storageConnection));
     if (NS_WARN_IF(NS_FAILED(rv))) {
       return rv;
@@ -14139,7 +14019,6 @@ Database::Database(Factory* aFactory,
                    const Maybe<ContentParentId>& aOptionalContentParentId,
                    const nsACString& aGroup,
                    const nsACString& aOrigin,
-                   uint32_t aTelemetryId,
                    FullDatabaseMetadata* aMetadata,
                    FileManager* aFileManager,
                    already_AddRefed<DirectoryLock> aDirectoryLock,
@@ -14156,7 +14035,6 @@ Database::Database(Factory* aFactory,
   , mId(aMetadata->mDatabaseId)
   , mFilePath(aMetadata->mFilePath)
   , mActiveMutableFileCount(0)
-  , mTelemetryId(aTelemetryId)
   , mPersistenceType(aMetadata->mCommonMetadata.persistenceType())
   , mFileHandleDisabled(aFileHandleDisabled)
   , mChromeWriteAccessAllowed(aChromeWriteAccessAllowed)
@@ -17396,8 +17274,7 @@ FileManager::InitDirectory(nsIFile* aDirectory,
                            nsIFile* aDatabaseFile,
                            PersistenceType aPersistenceType,
                            const nsACString& aGroup,
-                           const nsACString& aOrigin,
-                           uint32_t aTelemetryId)
+                           const nsACString& aOrigin)
 {
   AssertIsOnIOThread();
   MOZ_ASSERT(aDirectory);
@@ -17469,7 +17346,6 @@ FileManager::InitDirectory(nsIFile* aDirectory,
                                    aPersistenceType,
                                    aGroup,
                                    aOrigin,
-                                   aTelemetryId,
                                    getter_AddRefs(connection));
       if (NS_WARN_IF(NS_FAILED(rv))) {
         return rv;
@@ -17653,11 +17529,6 @@ QuotaClient::QuotaClient()
 {
   AssertIsOnBackgroundThread();
   MOZ_ASSERT(!sInstance, "We expect this to be a singleton!");
-  MOZ_ASSERT(!gTelemetryIdMutex);
-
-  // Always create this so that later access to gTelemetryIdHashtable can be
-  // properly synchronized.
-  gTelemetryIdMutex = new Mutex("IndexedDB gTelemetryIdMutex");
 
   sInstance = this;
 }
@@ -17666,14 +17537,8 @@ QuotaClient::~QuotaClient()
 {
   AssertIsOnBackgroundThread();
   MOZ_ASSERT(sInstance == this, "We expect this to be a singleton!");
-  MOZ_ASSERT(gTelemetryIdMutex);
   MOZ_ASSERT(!mMaintenanceThreadPool);
 
-  // No one else should be able to touch gTelemetryIdHashtable now that the
-  // QuotaClient has gone away.
-  gTelemetryIdHashtable = nullptr;
-  gTelemetryIdMutex = nullptr;
-
   sInstance = nullptr;
 }
 
@@ -17947,8 +17812,7 @@ QuotaClient::InitOrigin(PersistenceType aPersistenceType,
                                     initInfo.mDatabaseFile,
                                     aPersistenceType,
                                     aGroup,
-                                    aOrigin,
-                                    TelemetryIdForFile(initInfo.mDatabaseFile));
+                                    aOrigin);
     if (NS_WARN_IF(NS_FAILED(rv))) {
       return rv;
     }
@@ -19041,7 +18905,6 @@ DatabaseMaintenance::PerformMaintenanceOnDatabase()
                                      mPersistenceType,
                                      mGroup,
                                      mOrigin,
-                                     TelemetryIdForFile(databaseFile),
                                      getter_AddRefs(connection));
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return;
@@ -21172,16 +21035,6 @@ FactoryOp::CheckPermission(ContentParent* aContentParent,
       return NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR;
     }
 
-    if (NS_WARN_IF(!Preferences::GetBool(kPrefIndexedDBEnabled, false))) {
-      if (aContentParent) {
-        // The DOM in the other process should have kept us from receiving any
-        // indexedDB messages so assume that the child is misbehaving.
-        aContentParent->KillHard("IndexedDB CheckPermission 1");
-      }
-
-      return NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR;
-    }
-
     const ContentPrincipalInfo& contentPrincipalInfo =
       principalInfo.get_ContentPrincipalInfo();
     if (contentPrincipalInfo.attrs().mPrivateBrowsingId != 0) {
@@ -21668,7 +21521,6 @@ OpenDatabaseOp::OpenDatabaseOp(Factory* aFactory,
   , mMetadata(new FullDatabaseMetadata(aParams.metadata()))
   , mRequestedVersion(aParams.metadata().version())
   , mVersionChangeOp(nullptr)
-  , mTelemetryId(0)
 {
   if (mContentParent) {
     // This is a little scary but it looks safe to call this off the main thread
@@ -21777,8 +21629,6 @@ OpenDatabaseOp::DoDatabaseWork()
     return rv;
   }
 
-  mTelemetryId = TelemetryIdForFile(dbFile);
-
 #ifdef DEBUG
   nsString databaseFilePath;
   rv = dbFile->GetPath(databaseFilePath);
@@ -21809,7 +21659,6 @@ OpenDatabaseOp::DoDatabaseWork()
                                persistenceType,
                                mGroup,
                                mOrigin,
-                               mTelemetryId,
                                getter_AddRefs(connection));
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
@@ -22692,7 +22541,6 @@ OpenDatabaseOp::EnsureDatabaseActor()
                            mOptionalContentParentId,
                            mGroup,
                            mOrigin,
-                           mTelemetryId,
                            mMetadata,
                            mFileManager,
                            mDirectoryLock.forget(),
diff --git a/dom/indexedDB/FileManager.h b/dom/indexedDB/FileManager.h
index da917f431..0fba46ec0 100644
--- a/dom/indexedDB/FileManager.h
+++ b/dom/indexedDB/FileManager.h
@@ -58,8 +58,7 @@ public:
                 nsIFile* aDatabaseFile,
                 PersistenceType aPersistenceType,
                 const nsACString& aGroup,
-                const nsACString& aOrigin,
-                uint32_t aTelemetryId);
+                const nsACString& aOrigin);
 
   static nsresult
   GetUsage(nsIFile* aDirectory, uint64_t* aUsage);
diff --git a/dom/indexedDB/IDBCursor.cpp b/dom/indexedDB/IDBCursor.cpp
index 7ae35e981..af88742f0 100644
--- a/dom/indexedDB/IDBCursor.cpp
+++ b/dom/indexedDB/IDBCursor.cpp
@@ -948,7 +948,6 @@ NS_INTERFACE_MAP_END
 NS_IMPL_CYCLE_COLLECTION_CLASS(IDBCursor)
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(IDBCursor)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRequest)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSourceObjectStore)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSourceIndex)
diff --git a/dom/indexedDB/IDBFactory.cpp b/dom/indexedDB/IDBFactory.cpp
index 663828978..c1ef6353d 100644
--- a/dom/indexedDB/IDBFactory.cpp
+++ b/dom/indexedDB/IDBFactory.cpp
@@ -47,12 +47,6 @@ namespace dom {
 using namespace mozilla::dom::quota;
 using namespace mozilla::ipc;
 
-namespace {
-
-const char kPrefIndexedDBEnabled[] = "dom.indexedDB.enabled";
-
-} // namespace
-
 class IDBFactory::BackgroundCreateCallback final
   : public nsIIPCBackgroundChildCreateCallback
 {
@@ -130,12 +124,6 @@ IDBFactory::CreateForWindow(nsPIDOMWindowInner* aWindow,
   nsCOMPtr<nsIPrincipal> principal;
   nsresult rv = AllowedForWindowInternal(aWindow, getter_AddRefs(principal));
 
-  if (!(NS_SUCCEEDED(rv) && nsContentUtils::IsSystemPrincipal(principal)) &&
-      NS_WARN_IF(!Preferences::GetBool(kPrefIndexedDBEnabled, false))) {
-    *aFactory = nullptr;
-    return NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR;
-  }
-
   if (rv == NS_ERROR_DOM_NOT_SUPPORTED_ERR) {
     NS_WARNING("IndexedDB is not permitted in a third-party window.");
     *aFactory = nullptr;
@@ -246,12 +234,6 @@ IDBFactory::CreateForMainThreadJSInternal(
   MOZ_ASSERT(NS_IsMainThread());
   MOZ_ASSERT(aPrincipalInfo);
 
-  if (aPrincipalInfo->type() != PrincipalInfo::TSystemPrincipalInfo &&
-      NS_WARN_IF(!Preferences::GetBool(kPrefIndexedDBEnabled, false))) {
-    *aFactory = nullptr;
-    return NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR;
-  }
-
   IndexedDatabaseManager* mgr = IndexedDatabaseManager::GetOrCreate();
   if (NS_WARN_IF(!mgr)) {
     IDB_REPORT_INTERNAL_ERR();
@@ -883,7 +865,6 @@ NS_INTERFACE_MAP_END
 NS_IMPL_CYCLE_COLLECTION_CLASS(IDBFactory)
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(IDBFactory)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWindow)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
diff --git a/dom/indexedDB/IDBIndex.cpp b/dom/indexedDB/IDBIndex.cpp
index 657e744c9..af50926e6 100644
--- a/dom/indexedDB/IDBIndex.cpp
+++ b/dom/indexedDB/IDBIndex.cpp
@@ -652,7 +652,6 @@ NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(IDBIndex)
 NS_IMPL_CYCLE_COLLECTION_TRACE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(IDBIndex)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mObjectStore)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
diff --git a/dom/indexedDB/IDBKeyRange.cpp b/dom/indexedDB/IDBKeyRange.cpp
index 2de48a70c..e61c80617 100644
--- a/dom/indexedDB/IDBKeyRange.cpp
+++ b/dom/indexedDB/IDBKeyRange.cpp
@@ -239,7 +239,6 @@ NS_IMPL_CYCLE_COLLECTION_CLASS(IDBKeyRange)
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(IDBKeyRange)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mGlobal)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(IDBKeyRange)
diff --git a/dom/indexedDB/IDBObjectStore.cpp b/dom/indexedDB/IDBObjectStore.cpp
index 8a0b292ad..756792741 100644
--- a/dom/indexedDB/IDBObjectStore.cpp
+++ b/dom/indexedDB/IDBObjectStore.cpp
@@ -1758,7 +1758,6 @@ NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(IDBObjectStore)
 NS_IMPL_CYCLE_COLLECTION_TRACE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(IDBObjectStore)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTransaction)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mIndexes)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDeletedIndexes)
diff --git a/dom/indexedDB/IDBRequest.cpp b/dom/indexedDB/IDBRequest.cpp
index 919d3adc7..e0e318059 100644
--- a/dom/indexedDB/IDBRequest.cpp
+++ b/dom/indexedDB/IDBRequest.cpp
@@ -417,8 +417,6 @@ IDBRequest::GetError(ErrorResult& aRv)
 NS_IMPL_CYCLE_COLLECTION_CLASS(IDBRequest)
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(IDBRequest, IDBWrapperCache)
-  // Don't need NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS because
-  // DOMEventTargetHelper does it for us.
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSourceAsObjectStore)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSourceAsIndex)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSourceAsCursor)
diff --git a/dom/indexedDB/IDBWrapperCache.cpp b/dom/indexedDB/IDBWrapperCache.cpp
index df62514c8..ccc2bb43e 100644
--- a/dom/indexedDB/IDBWrapperCache.cpp
+++ b/dom/indexedDB/IDBWrapperCache.cpp
@@ -18,8 +18,6 @@ NS_IMPL_CYCLE_COLLECTION_CLASS(IDBWrapperCache)
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(IDBWrapperCache,
                                                   DOMEventTargetHelper)
-  // Don't need NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS because
-  // DOMEventTargetHelper does it for us.
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(IDBWrapperCache,
diff --git a/dom/indexedDB/KeyPath.cpp b/dom/indexedDB/KeyPath.cpp
index dc8d10668..30edd8cd7 100644
--- a/dom/indexedDB/KeyPath.cpp
+++ b/dom/indexedDB/KeyPath.cpp
@@ -14,6 +14,7 @@
 #include "xpcpublic.h"
 
 #include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/BlobBinding.h"
 #include "mozilla/dom/IDBObjectStoreBinding.h"
 
 namespace mozilla {
@@ -100,7 +101,6 @@ GetJSValFromKeyPathString(JSContext* aCx,
     const char16_t* keyPathChars = token.BeginReading();
     const size_t keyPathLen = token.Length();
 
-    bool hasProp;
     if (!targetObject) {
       // We're still walking the chain of existing objects
       // http://w3c.github.io/IndexedDB/#dfn-evaluate-a-key-path-on-a-value
@@ -116,16 +116,77 @@ GetJSValFromKeyPathString(JSContext* aCx,
       }
       obj = &currentVal.toObject();
 
-      bool ok = JS_HasUCProperty(aCx, obj, keyPathChars, keyPathLen,
-                                 &hasProp);
+      // We call JS_GetOwnUCPropertyDescriptor on purpose (as opposed to
+      // JS_GetUCPropertyDescriptor) to avoid searching the prototype chain.
+      JS::Rooted<JS::PropertyDescriptor> desc(aCx);
+      bool ok = JS_GetOwnUCPropertyDescriptor(aCx, obj, keyPathChars,
+                                              keyPathLen, &desc);
       IDB_ENSURE_TRUE(ok, NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
 
-      if (hasProp) {
-        // Get if the property exists...
-        JS::Rooted<JS::Value> intermediate(aCx);
-        bool ok = JS_GetUCProperty(aCx, obj, keyPathChars, keyPathLen, &intermediate);
-        IDB_ENSURE_TRUE(ok, NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
+      JS::Rooted<JS::Value> intermediate(aCx);
+      bool hasProp = false;
+
+      if (desc.object()) {
+        intermediate = desc.value();
+        hasProp = true;
+      } else {
+        // If we get here it means the object doesn't have the property or the
+        // property is available throuch a getter. We don't want to call any
+        // getters to avoid potential re-entrancy.
+        // The blob object is special since its properties are available
+        // only through getters but we still want to support them for key
+        // extraction. So they need to be handled manually.
+        Blob* blob;
+        if (NS_SUCCEEDED(UNWRAP_OBJECT(Blob, &obj, blob))) {
+          if (token.EqualsLiteral("size")) {
+            ErrorResult rv;
+            uint64_t size = blob->GetSize(rv);
+            MOZ_ALWAYS_TRUE(!rv.Failed());
+
+            intermediate = JS_NumberValue(size);
+            hasProp = true;
+          } else if (token.EqualsLiteral("type")) {
+            nsString type;
+            blob->GetType(type);
+
+            JSString* string =
+              JS_NewUCStringCopyN(aCx, type.get(), type.Length());
+
+            intermediate = JS::StringValue(string);
+            hasProp = true;
+          } else {
+            RefPtr<File> file = blob->ToFile();
+            if (file) {
+              if (token.EqualsLiteral("name")) {
+                nsString name;
+                file->GetName(name);
+
+                JSString* string =
+                  JS_NewUCStringCopyN(aCx, name.get(), name.Length());
+
+                intermediate = JS::StringValue(string);
+                hasProp = true;
+              } else if (token.EqualsLiteral("lastModified")) {
+                ErrorResult rv;
+                int64_t lastModifiedDate = file->GetLastModified(rv);
+                MOZ_ALWAYS_TRUE(!rv.Failed());
+
+                intermediate = JS_NumberValue(lastModifiedDate);
+                hasProp = true;
+              } else if (token.EqualsLiteral("lastModifiedDate")) {
+                ErrorResult rv;
+                Date lastModifiedDate = file->GetLastModifiedDate(rv);
+                MOZ_ALWAYS_TRUE(!rv.Failed());
+
+                lastModifiedDate.ToDateObject(aCx, &intermediate);
+                hasProp = true;
+              }
+            }
+          }
+        }
+      }
 
+      if (hasProp) {
         // Treat explicitly undefined as an error.
         if (intermediate.isUndefined()) {
           return NS_ERROR_DOM_INDEXEDDB_DATA_ERR;
diff --git a/dom/interfaces/html/nsIDOMHTMLElement.idl b/dom/interfaces/html/nsIDOMHTMLElement.idl
index 63a1f9572..686475f04 100644
--- a/dom/interfaces/html/nsIDOMHTMLElement.idl
+++ b/dom/interfaces/html/nsIDOMHTMLElement.idl
@@ -58,7 +58,6 @@ interface nsIDOMHTMLElement : nsIDOMElement
 
 
   // CSSOM View
-  [optional_argc] void scrollIntoView([optional] in boolean top);
   readonly attribute nsIDOMElement    offsetParent;
   readonly attribute long             offsetTop;
   readonly attribute long             offsetLeft;
diff --git a/dom/ipc/ContentChild.cpp b/dom/ipc/ContentChild.cpp
index fc288e2c5..fdf0fcf3e 100644
--- a/dom/ipc/ContentChild.cpp
+++ b/dom/ipc/ContentChild.cpp
@@ -171,7 +171,6 @@
 #include "GMPServiceChild.h"
 #include "gfxPlatform.h"
 #include "nscore.h" // for NS_FREE_PERMANENT_DATA
-#include "VRManagerChild.h"
 
 using namespace mozilla;
 using namespace mozilla::docshell;
@@ -1148,7 +1147,6 @@ ContentChild::RecvGMPsChanged(nsTArray<GMPCapabilityData>&& capabilities)
 bool
 ContentChild::RecvInitRendering(Endpoint<PCompositorBridgeChild>&& aCompositor,
                                 Endpoint<PImageBridgeChild>&& aImageBridge,
-                                Endpoint<PVRManagerChild>&& aVRBridge,
                                 Endpoint<PVideoDecoderManagerChild>&& aVideoManager)
 {
   if (!CompositorBridgeChild::InitForContent(Move(aCompositor))) {
@@ -1157,9 +1155,6 @@ ContentChild::RecvInitRendering(Endpoint<PCompositorBridgeChild>&& aCompositor,
   if (!ImageBridgeChild::InitForContent(Move(aImageBridge))) {
     return false;
   }
-  if (!gfx::VRManagerChild::InitForContent(Move(aVRBridge))) {
-    return false;
-  }
   VideoDecoderManagerChild::InitForContent(Move(aVideoManager));
   return true;
 }
@@ -1167,7 +1162,6 @@ ContentChild::RecvInitRendering(Endpoint<PCompositorBridgeChild>&& aCompositor,
 bool
 ContentChild::RecvReinitRendering(Endpoint<PCompositorBridgeChild>&& aCompositor,
                                   Endpoint<PImageBridgeChild>&& aImageBridge,
-                                  Endpoint<PVRManagerChild>&& aVRBridge,
                                   Endpoint<PVideoDecoderManagerChild>&& aVideoManager)
 {
   nsTArray<RefPtr<TabChild>> tabs = TabChild::GetAll();
@@ -1186,9 +1180,6 @@ ContentChild::RecvReinitRendering(Endpoint<PCompositorBridgeChild>&& aCompositor
   if (!ImageBridgeChild::ReinitForContent(Move(aImageBridge))) {
     return false;
   }
-  if (!gfx::VRManagerChild::ReinitForContent(Move(aVRBridge))) {
-    return false;
-  }
 
   // Establish new PLayerTransactions.
   for (const auto& tabChild : tabs) {
diff --git a/dom/ipc/ContentChild.h b/dom/ipc/ContentChild.h
index ba590b58e..4c8f15cc0 100644
--- a/dom/ipc/ContentChild.h
+++ b/dom/ipc/ContentChild.h
@@ -152,14 +152,12 @@ public:
   RecvInitRendering(
     Endpoint<PCompositorBridgeChild>&& aCompositor,
     Endpoint<PImageBridgeChild>&& aImageBridge,
-    Endpoint<PVRManagerChild>&& aVRBridge,
     Endpoint<PVideoDecoderManagerChild>&& aVideoManager) override;
 
   bool
   RecvReinitRendering(
     Endpoint<PCompositorBridgeChild>&& aCompositor,
     Endpoint<PImageBridgeChild>&& aImageBridge,
-    Endpoint<PVRManagerChild>&& aVRBridge,
     Endpoint<PVideoDecoderManagerChild>&& aVideoManager) override;
 
   PProcessHangMonitorChild*
diff --git a/dom/ipc/ContentParent.cpp b/dom/ipc/ContentParent.cpp
index 0a07147bf..79446151c 100644
--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -84,7 +84,6 @@
 #include "mozilla/ScopeExit.h"
 #include "mozilla/Services.h"
 #include "mozilla/StaticPtr.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/WebBrowserPersistDocumentParent.h"
 #include "mozilla/Unused.h"
 #include "nsAnonymousTemporaryFile.h"
@@ -1718,9 +1717,6 @@ ContentParent::ActorDestroy(ActorDestroyReason why)
     props->SetPropertyAsUint64(NS_LITERAL_STRING("childID"), mChildID);
 
     if (AbnormalShutdown == why) {
-      Telemetry::Accumulate(Telemetry::SUBPROCESS_ABNORMAL_ABORT,
-                            NS_LITERAL_CSTRING("content"), 1);
-
       props->SetPropertyAsBool(NS_LITERAL_STRING("abnormal"), true);
     }
     nsAutoString cpId;
@@ -2076,21 +2072,18 @@ ContentParent::InitInternal(ProcessPriority aInitialPriority,
 
       Endpoint<PCompositorBridgeChild> compositor;
       Endpoint<PImageBridgeChild> imageBridge;
-      Endpoint<PVRManagerChild> vrBridge;
       Endpoint<PVideoDecoderManagerChild> videoManager;
 
       DebugOnly<bool> opened = gpm->CreateContentBridges(
         OtherPid(),
         &compositor,
         &imageBridge,
-        &vrBridge,
         &videoManager);
       MOZ_ASSERT(opened);
 
       Unused << SendInitRendering(
         Move(compositor),
         Move(imageBridge),
-        Move(vrBridge),
         Move(videoManager));
 
       gpm->AddListener(this);
@@ -2204,21 +2197,18 @@ ContentParent::OnCompositorUnexpectedShutdown()
 
   Endpoint<PCompositorBridgeChild> compositor;
   Endpoint<PImageBridgeChild> imageBridge;
-  Endpoint<PVRManagerChild> vrBridge;
   Endpoint<PVideoDecoderManagerChild> videoManager;
 
   DebugOnly<bool> opened = gpm->CreateContentBridges(
     OtherPid(),
     &compositor,
     &imageBridge,
-    &vrBridge,
     &videoManager);
   MOZ_ASSERT(opened);
 
   Unused << SendReinitRendering(
     Move(compositor),
     Move(imageBridge),
-    Move(vrBridge),
     Move(videoManager));
 }
 
@@ -3373,17 +3363,6 @@ ContentParent::RecvIsSecureURI(const uint32_t& type,
 }
 
 bool
-ContentParent::RecvAccumulateMixedContentHSTS(const URIParams& aURI, const bool& aActive)
-{
-  nsCOMPtr<nsIURI> ourURI = DeserializeURI(aURI);
-  if (!ourURI) {
-    return false;
-  }
-  nsMixedContentBlocker::AccumulateMixedContentHSTS(ourURI, aActive);
-  return true;
-}
-
-bool
 ContentParent::RecvLoadURIExternal(const URIParams& uri,
                                    PBrowserParent* windowContext)
 {
@@ -4773,19 +4752,3 @@ ContentParent::ForceTabPaint(TabParent* aTabParent, uint64_t aLayerObserverEpoch
   }
   ProcessHangMonitor::ForcePaint(mHangMonitorActor, aTabParent, aLayerObserverEpoch);
 }
-
-bool
-ContentParent::RecvAccumulateChildHistogram(
-                InfallibleTArray<Accumulation>&& aAccumulations)
-{
-  Telemetry::AccumulateChild(GeckoProcessType_Content, aAccumulations);
-  return true;
-}
-
-bool
-ContentParent::RecvAccumulateChildKeyedHistogram(
-                InfallibleTArray<KeyedAccumulation>&& aAccumulations)
-{
-  Telemetry::AccumulateChildKeyed(GeckoProcessType_Content, aAccumulations);
-  return true;
-}
diff --git a/dom/ipc/ContentParent.h b/dom/ipc/ContentParent.h
index abcea0b65..26b5c44ac 100644
--- a/dom/ipc/ContentParent.h
+++ b/dom/ipc/ContentParent.h
@@ -741,9 +741,6 @@ private:
   virtual bool RecvIsSecureURI(const uint32_t& aType, const URIParams& aURI,
                                const uint32_t& aFlags, bool* aIsSecureURI) override;
 
-  virtual bool RecvAccumulateMixedContentHSTS(const URIParams& aURI,
-                                              const bool& aActive) override;
-
   virtual bool DeallocPHalParent(PHalParent*) override;
 
   virtual bool
@@ -1044,10 +1041,6 @@ private:
 
   virtual bool RecvDeleteGetFilesRequest(const nsID& aID) override;
 
-  virtual bool RecvAccumulateChildHistogram(
-                  InfallibleTArray<Accumulation>&& aAccumulations) override;
-  virtual bool RecvAccumulateChildKeyedHistogram(
-                  InfallibleTArray<KeyedAccumulation>&& aAccumulations) override;
 public:
   void SendGetFilesResponseAndForget(const nsID& aID,
                                      const GetFilesResponseResult& aResult);
diff --git a/dom/ipc/PContent.ipdl b/dom/ipc/PContent.ipdl
index c01ad59c1..e8fb25aec 100644
--- a/dom/ipc/PContent.ipdl
+++ b/dom/ipc/PContent.ipdl
@@ -44,7 +44,6 @@ include protocol PRemoteSpellcheckEngine;
 include protocol PWebBrowserPersistDocument;
 include protocol PWebrtcGlobal;
 include protocol PPresentation;
-include protocol PVRManager;
 include protocol PVideoDecoderManager;
 include protocol PFlyWebPublishedServer;
 include DOMTypes;
@@ -90,8 +89,6 @@ using mozilla::DataStorageType from "ipc/DataStorageIPCUtils.h";
 using mozilla::DocShellOriginAttributes from "mozilla/ipc/BackgroundUtils.h";
 using struct mozilla::layers::TextureFactoryIdentifier from "mozilla/layers/CompositorTypes.h";
 using struct mozilla::dom::FlyWebPublishOptions from "mozilla/dom/FlyWebPublishOptionsIPCSerializer.h";
-using mozilla::Telemetry::Accumulation from "mozilla/TelemetryComms.h";
-using mozilla::Telemetry::KeyedAccumulation from "mozilla/TelemetryComms.h";
 
 union ChromeRegistryItem
 {
@@ -311,7 +308,6 @@ child:
     async InitRendering(
       Endpoint<PCompositorBridgeChild> compositor,
       Endpoint<PImageBridgeChild> imageBridge,
-      Endpoint<PVRManagerChild> vr,
       Endpoint<PVideoDecoderManagerChild> video);
 
     // Re-create the rendering stack using the given endpoints. This is sent
@@ -320,7 +316,6 @@ child:
     async ReinitRendering(
       Endpoint<PCompositorBridgeChild> compositor,
       Endpoint<PImageBridgeChild> bridge,
-      Endpoint<PVRManagerChild> vr,
       Endpoint<PVideoDecoderManagerChild> video);
 
     /**
@@ -661,8 +656,6 @@ parent:
     sync IsSecureURI(uint32_t type, URIParams uri, uint32_t flags)
         returns (bool isSecureURI);
 
-    async AccumulateMixedContentHSTS(URIParams uri, bool active);
-
     sync GetLookAndFeelCache()
         returns (LookAndFeelInt[] lookAndFeelIntCache);
 
@@ -1025,12 +1018,6 @@ parent:
 
      async UnstoreAndBroadcastBlobURLUnregistration(nsCString url);
 
-    /**
-     * Messages for communicating child Telemetry to the parent process
-     */
-    async AccumulateChildHistogram(Accumulation[] accumulations);
-    async AccumulateChildKeyedHistogram(KeyedAccumulation[] accumulations);
-
     sync GetA11yContentId() returns (uint32_t aContentId);
 
 both:
diff --git a/dom/ipc/TabChild.cpp b/dom/ipc/TabChild.cpp
index 705799c54..e1355adee 100644
--- a/dom/ipc/TabChild.cpp
+++ b/dom/ipc/TabChild.cpp
@@ -107,7 +107,6 @@
 #include "nsDeviceContext.h"
 #include "nsSandboxFlags.h"
 #include "FrameLayerBuilder.h"
-#include "VRManagerChild.h"
 #include "nsICommandParams.h"
 #include "nsISHistory.h"
 #include "nsQueryObject.h"
@@ -177,7 +176,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(TabChildBase)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTabChildGlobal)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mGlobal)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWebBrowserChrome)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
@@ -2395,7 +2393,6 @@ TabChild::RecvSetDocShellIsActive(const bool& aIsActive,
         root->SchedulePaint();
       }
 
-      Telemetry::AutoTimer<Telemetry::TABCHILD_PAINT_TIME> timer;
       // If we need to repaint, let's do that right away. No sense waiting until
       // we get back to the event loop again. We suppress the display port so that
       // we only paint what's visible. This ensures that the tab we're switching
@@ -2566,7 +2563,6 @@ TabChild::InitRenderingState(const TextureFactoryIdentifier& aTextureFactoryIden
       lf->SetShadowManager(shadowManager);
       lf->IdentifyTextureHost(mTextureFactoryIdentifier);
       ImageBridgeChild::IdentifyCompositorTextureHost(mTextureFactoryIdentifier);
-      gfx::VRManagerChild::IdentifyTextureHost(mTextureFactoryIdentifier);
     }
 
     mRemoteFrame = remoteFrame;
diff --git a/dom/locales/en-US/chrome/security/security.properties b/dom/locales/en-US/chrome/security/security.properties
index 8efdb0a6d..2be56fb9d 100644
--- a/dom/locales/en-US/chrome/security/security.properties
+++ b/dom/locales/en-US/chrome/security/security.properties
@@ -85,3 +85,5 @@ BlockScriptWithWrongMimeType=Script from “%1$S” was blocked because of a dis
 
 # LOCALIZATION NOTE: Do not translate "data: URI".
 BlockTopLevelDataURINavigation=Navigation to toplevel data: URI not allowed (Blocked loading of: “%1$S”)
+
+BlockSubresourceFTP=Loading FTP subresource within http(s) page not allowed (Blocked loading of: “%1$S”)
diff --git a/dom/media/AudioStream.cpp b/dom/media/AudioStream.cpp
index 54cf7b965..4b1d82c37 100644
--- a/dom/media/AudioStream.cpp
+++ b/dom/media/AudioStream.cpp
@@ -14,7 +14,6 @@
 #include "mozilla/Mutex.h"
 #include "mozilla/Sprintf.h"
 #include <algorithm>
-#include "mozilla/Telemetry.h"
 #include "CubebUtils.h"
 #include "nsPrintfCString.h"
 #include "gfxPrefs.h"
@@ -346,7 +345,6 @@ AudioStream::Init(uint32_t aNumChannels, uint32_t aRate,
   cubeb* cubebContext = CubebUtils::GetCubebContext();
   if (!cubebContext) {
     NS_WARNING("Can't get cubeb context!");
-    CubebUtils::ReportCubebStreamInitFailure(true);
     return NS_ERROR_DOM_MEDIA_CUBEB_INITIALIZATION_ERR;
   }
 
@@ -368,18 +366,14 @@ AudioStream::OpenCubeb(cubeb* aContext, cubeb_stream_params& aParams,
                         latency_frames,
                         DataCallback_S, StateCallback_S, this) == CUBEB_OK) {
     mCubebStream.reset(stream);
-    CubebUtils::ReportCubebBackendUsed();
   } else {
     NS_WARNING(nsPrintfCString("AudioStream::OpenCubeb() %p failed to init cubeb", this).get());
-    CubebUtils::ReportCubebStreamInitFailure(aIsFirst);
     return NS_ERROR_FAILURE;
   }
 
   TimeDuration timeDelta = TimeStamp::Now() - aStartTime;
   LOG("creation time %sfirst: %u ms", aIsFirst ? "" : "not ",
       (uint32_t) timeDelta.ToMilliseconds());
-  Telemetry::Accumulate(aIsFirst ? Telemetry::AUDIOSTREAM_FIRST_OPEN_MS :
-      Telemetry::AUDIOSTREAM_LATER_OPEN_MS, timeDelta.ToMilliseconds());
 
   return NS_OK;
 }
diff --git a/dom/media/Benchmark.cpp b/dom/media/Benchmark.cpp
index fdbedeca5..7394f8036 100644
--- a/dom/media/Benchmark.cpp
+++ b/dom/media/Benchmark.cpp
@@ -11,7 +11,6 @@
 #include "PDMFactory.h"
 #include "WebMDemuxer.h"
 #include "mozilla/Preferences.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/dom/ContentChild.h"
 
 #ifndef MOZ_WIDGET_ANDROID
@@ -68,7 +67,6 @@ VP9Benchmark::IsVP9DecodeFast()
           Preferences::SetUint(sBenchmarkFpsPref, aDecodeFps);
           Preferences::SetUint(sBenchmarkFpsVersionCheck, sBenchmarkVersionID);
         }
-        Telemetry::Accumulate(Telemetry::ID::VIDEO_VP9_BENCHMARK_FPS, aDecodeFps);
       },
       []() { });
   }
diff --git a/dom/media/CubebUtils.cpp b/dom/media/CubebUtils.cpp
index fe94264ee..0f0167d9c 100644
--- a/dom/media/CubebUtils.cpp
+++ b/dom/media/CubebUtils.cpp
@@ -239,39 +239,6 @@ cubeb* GetCubebContextUnlocked()
   return sCubebContext;
 }
 
-void ReportCubebBackendUsed()
-{
-  StaticMutexAutoLock lock(sMutex);
-
-  sAudioStreamInitEverSucceeded = true;
-
-  bool foundBackend = false;
-  for (uint32_t i = 0; i < ArrayLength(AUDIOSTREAM_BACKEND_ID_STR); i++) {
-    if (!strcmp(cubeb_get_backend_id(sCubebContext), AUDIOSTREAM_BACKEND_ID_STR[i])) {
-      Telemetry::Accumulate(Telemetry::AUDIOSTREAM_BACKEND_USED, i);
-      foundBackend = true;
-    }
-  }
-  if (!foundBackend) {
-    Telemetry::Accumulate(Telemetry::AUDIOSTREAM_BACKEND_USED,
-                          CUBEB_BACKEND_UNKNOWN);
-  }
-}
-
-void ReportCubebStreamInitFailure(bool aIsFirst)
-{
-  StaticMutexAutoLock lock(sMutex);
-  if (!aIsFirst && !sAudioStreamInitEverSucceeded) {
-    // This machine has no audio hardware, or it's in really bad shape, don't
-    // send this info, since we want CUBEB_BACKEND_INIT_FAILURE_OTHER to detect
-    // failures to open multiple streams in a process over time.
-    return;
-  }
-  Telemetry::Accumulate(Telemetry::AUDIOSTREAM_BACKEND_USED,
-                        aIsFirst ? CUBEB_BACKEND_INIT_FAILURE_FIRST
-                                 : CUBEB_BACKEND_INIT_FAILURE_OTHER);
-}
-
 uint32_t GetCubebPlaybackLatencyInMilliseconds()
 {
   StaticMutexAutoLock lock(sMutex);
diff --git a/dom/media/CubebUtils.h b/dom/media/CubebUtils.h
index fa5fc2294..f43492374 100644
--- a/dom/media/CubebUtils.h
+++ b/dom/media/CubebUtils.h
@@ -35,8 +35,6 @@ double GetVolumeScale();
 bool GetFirstStream();
 cubeb* GetCubebContext();
 cubeb* GetCubebContextUnlocked();
-void ReportCubebStreamInitFailure(bool aIsFirstStream);
-void ReportCubebBackendUsed();
 uint32_t GetCubebPlaybackLatencyInMilliseconds();
 Maybe<uint32_t> GetCubebMSGLatencyInFrames();
 bool CubebLatencyPrefSet();
diff --git a/dom/media/DecoderTraits.cpp b/dom/media/DecoderTraits.cpp
index ddd35fe0d..6aa44f3e5 100644
--- a/dom/media/DecoderTraits.cpp
+++ b/dom/media/DecoderTraits.cpp
@@ -10,7 +10,6 @@
 #include "nsCharSeparatedTokenizer.h"
 #include "nsMimeTypes.h"
 #include "mozilla/Preferences.h"
-#include "mozilla/Telemetry.h"
 
 #include "OggDecoder.h"
 #include "OggDemuxer.h"
@@ -18,15 +17,6 @@
 #include "WebMDecoder.h"
 #include "WebMDemuxer.h"
 
-#ifdef MOZ_ANDROID_OMX
-#include "AndroidMediaDecoder.h"
-#include "AndroidMediaReader.h"
-#include "AndroidMediaPluginHost.h"
-#endif
-#ifdef MOZ_DIRECTSHOW
-#include "DirectShowDecoder.h"
-#include "DirectShowReader.h"
-#endif
 #ifdef MOZ_FMP4
 #include "MP4Decoder.h"
 #include "MP4Demuxer.h"
@@ -94,45 +84,6 @@ DecoderTraits::IsWebMAudioType(const nsACString& aType)
   return aType.EqualsASCII("audio/webm");
 }
 
-static char const *const gHttpLiveStreamingTypes[] = {
-  // For m3u8.
-  // https://tools.ietf.org/html/draft-pantos-http-live-streaming-19#section-10
-  "application/vnd.apple.mpegurl",
-  // Some sites serve these as the informal m3u type.
-  "application/x-mpegurl",
-  "audio/x-mpegurl",
-  nullptr
-};
-
-static bool
-IsHttpLiveStreamingType(const nsACString& aType)
-{
-  return CodecListContains(gHttpLiveStreamingTypes, aType);
-}
-
-#ifdef MOZ_ANDROID_OMX
-static bool
-IsAndroidMediaType(const nsACString& aType)
-{
-  if (!MediaDecoder::IsAndroidMediaPluginEnabled()) {
-    return false;
-  }
-
-  static const char* supportedTypes[] = {
-    "audio/mpeg", "audio/mp4", "video/mp4", "video/x-m4v", nullptr
-  };
-  return CodecListContains(supportedTypes, aType);
-}
-#endif
-
-#ifdef MOZ_DIRECTSHOW
-static bool
-IsDirectShowSupportedType(const nsACString& aType)
-{
-  return DirectShowDecoder::GetSupportedCodecs(aType, nullptr);
-}
-#endif
-
 #ifdef MOZ_FMP4
 static bool
 IsMP4SupportedType(const MediaContentType& aParsedType,
@@ -247,14 +198,6 @@ CanHandleCodecsType(const MediaContentType& aType,
   if (IsFlacSupportedType(aType.GetMIMEType(), aType.GetCodecs())) {
     return CANPLAY_YES;
   }
-#ifdef MOZ_DIRECTSHOW
-  DirectShowDecoder::GetSupportedCodecs(aType.GetMIMEType(), &codecList);
-#endif
-#ifdef MOZ_ANDROID_OMX
-  if (MediaDecoder::IsAndroidMediaPluginEnabled()) {
-    EnsureAndroidMediaPluginHost()->FindDecoder(aType.GetMIMEType(), &codecList);
-  }
-#endif
   if (!codecList) {
     return CANPLAY_MAYBE;
   }
@@ -287,10 +230,6 @@ CanHandleMediaType(const MediaContentType& aType,
 {
   MOZ_ASSERT(NS_IsMainThread());
 
-  if (IsHttpLiveStreamingType(aType.GetMIMEType())) {
-    Telemetry::Accumulate(Telemetry::MEDIA_HLS_CANPLAY_REQUESTED, true);
-  }
-
   if (aType.HaveCodecs()) {
     CanPlayStatus result = CanHandleCodecsType(aType, aDiagnostics);
     if (result == CANPLAY_NO || result == CANPLAY_YES) {
@@ -320,17 +259,6 @@ CanHandleMediaType(const MediaContentType& aType,
   if (IsFlacSupportedType(aType.GetMIMEType())) {
     return CANPLAY_MAYBE;
   }
-#ifdef MOZ_DIRECTSHOW
-  if (DirectShowDecoder::GetSupportedCodecs(aType.GetMIMEType(), nullptr)) {
-    return CANPLAY_MAYBE;
-  }
-#endif
-#ifdef MOZ_ANDROID_OMX
-  if (MediaDecoder::IsAndroidMediaPluginEnabled() &&
-      EnsureAndroidMediaPluginHost()->FindDecoder(aType.GetMIMEType(), nullptr)) {
-    return CANPLAY_MAYBE;
-  }
-#endif
   return CANPLAY_NO;
 }
 
@@ -411,33 +339,12 @@ InstantiateDecoder(const nsACString& aType,
     decoder = new FlacDecoder(aOwner);
     return decoder.forget();
   }
-#ifdef MOZ_ANDROID_OMX
-  if (MediaDecoder::IsAndroidMediaPluginEnabled() &&
-      EnsureAndroidMediaPluginHost()->FindDecoder(aType, nullptr)) {
-    decoder = new AndroidMediaDecoder(aOwner, aType);
-    return decoder.forget();
-  }
-#endif
 
   if (IsWebMSupportedType(aType)) {
     decoder = new WebMDecoder(aOwner);
     return decoder.forget();
   }
 
-#ifdef MOZ_DIRECTSHOW
-  // Note: DirectShow should come before WMF, so that we prefer DirectShow's
-  // MP3 support over WMF's.
-  if (IsDirectShowSupportedType(aType)) {
-    decoder = new DirectShowDecoder(aOwner);
-    return decoder.forget();
-  }
-#endif
-
-  if (IsHttpLiveStreamingType(aType)) {
-    // We don't have an HLS decoder.
-    Telemetry::Accumulate(Telemetry::MEDIA_HLS_DECODER_SUCCESS, false);
-  }
-
   return nullptr;
 }
 
@@ -466,7 +373,7 @@ MediaDecoderReader* DecoderTraits::CreateReader(const nsACString& aType, Abstrac
   } else
 #endif
   if (IsMP3SupportedType(aType)) {
-    decoderReader = new MediaFormatReader(aDecoder, new mp3::MP3Demuxer(aDecoder->GetResource()));
+    decoderReader = new MediaFormatReader(aDecoder, new MP3Demuxer(aDecoder->GetResource()));
   } else
   if (IsAACSupportedType(aType)) {
     decoderReader = new MediaFormatReader(aDecoder, new ADTSDemuxer(aDecoder->GetResource()));
@@ -480,22 +387,10 @@ MediaDecoderReader* DecoderTraits::CreateReader(const nsACString& aType, Abstrac
   if (IsOggSupportedType(aType)) {
     decoderReader = new MediaFormatReader(aDecoder, new OggDemuxer(aDecoder->GetResource()));
   } else
-#ifdef MOZ_ANDROID_OMX
-  if (MediaDecoder::IsAndroidMediaPluginEnabled() &&
-      EnsureAndroidMediaPluginHost()->FindDecoder(aType, nullptr)) {
-    decoderReader = new AndroidMediaReader(aDecoder, aType);
-  } else
-#endif
   if (IsWebMSupportedType(aType)) {
     decoderReader =
       new MediaFormatReader(aDecoder, new WebMDemuxer(aDecoder->GetResource()));
-  } else
-#ifdef MOZ_DIRECTSHOW
-  if (IsDirectShowSupportedType(aType)) {
-    decoderReader = new DirectShowReader(aDecoder);
-  } else
-#endif
-  if (false) {} // dummy if to take care of the dangling else
+  }
 
   return decoderReader;
 }
@@ -514,18 +409,12 @@ bool DecoderTraits::IsSupportedInVideoDocument(const nsACString& aType)
   return
     IsOggSupportedType(aType) ||
     IsWebMSupportedType(aType) ||
-#ifdef MOZ_ANDROID_OMX
-    (MediaDecoder::IsAndroidMediaPluginEnabled() && IsAndroidMediaType(aType)) ||
-#endif
 #ifdef MOZ_FMP4
     IsMP4SupportedType(aType, /* DecoderDoctorDiagnostics* */ nullptr) ||
 #endif
     IsMP3SupportedType(aType) ||
     IsAACSupportedType(aType) ||
     IsFlacSupportedType(aType) ||
-#ifdef MOZ_DIRECTSHOW
-    IsDirectShowSupportedType(aType) ||
-#endif
     false;
 }
 
diff --git a/dom/media/GraphDriver.cpp b/dom/media/GraphDriver.cpp
index cae15eb8c..37c692a4b 100644
--- a/dom/media/GraphDriver.cpp
+++ b/dom/media/GraphDriver.cpp
@@ -200,7 +200,7 @@ public:
     STREAM_LOG(LogLevel::Debug, ("Starting system thread"));
     profiler_register_thread("MediaStreamGraph", &aLocal);
     LIFECYCLE_LOG("Starting a new system driver for graph %p\n",
-                  mDriver->mGraphImpl);
+                  mDriver->mGraphImpl.get());
 
     RefPtr<GraphDriver> previousDriver;
     {
@@ -236,7 +236,7 @@ private:
 void
 ThreadedDriver::Start()
 {
-  LIFECYCLE_LOG("Starting thread for a SystemClockDriver  %p\n", mGraphImpl);
+  LIFECYCLE_LOG("Starting thread for a SystemClockDriver  %p\n", mGraphImpl.get());
   Unused << NS_WARN_IF(mThread);
   if (!mThread) { // Ensure we haven't already started it
     nsCOMPtr<nsIRunnable> event = new MediaStreamGraphInitThreadRunnable(this);
@@ -623,16 +623,12 @@ AudioCallbackDriver::Init()
   cubeb* cubebContext = CubebUtils::GetCubebContext();
   if (!cubebContext) {
     NS_WARNING("Could not get cubeb context.");
-    if (!mFromFallback) {
-      CubebUtils::ReportCubebStreamInitFailure(true);
-    }
     return;
   }
 
   cubeb_stream_params output;
   cubeb_stream_params input;
   uint32_t latency_frames;
-  bool firstStream = CubebUtils::GetFirstStream();
 
   MOZ_ASSERT(!NS_IsMainThread(),
       "This is blocking and should never run on the main thread.");
@@ -710,18 +706,11 @@ AudioCallbackDriver::Init()
       NS_WARNING_ASSERTION(
         rv == CUBEB_OK,
         "Could not set the audio stream volume in GraphDriver.cpp");
-      CubebUtils::ReportCubebBackendUsed();
     } else {
 #ifdef MOZ_WEBRTC
       StaticMutexAutoUnlock unlock(AudioInputCubeb::Mutex());
 #endif
       NS_WARNING("Could not create a cubeb stream for MediaStreamGraph, falling back to a SystemClockDriver");
-      // Only report failures when we're not coming from a driver that was
-      // created itself as a fallback driver because of a previous audio driver
-      // failure.
-      if (!mFromFallback) {
-        CubebUtils::ReportCubebStreamInitFailure(firstStream);
-      }
       // Fall back to a driver using a normal thread. If needed,
       // the graph will try to re-open an audio stream later.
       MonitorAutoLock lock(GraphImpl()->GetMonitor());
@@ -761,7 +750,7 @@ AudioCallbackDriver::Destroy()
 void
 AudioCallbackDriver::Resume()
 {
-  STREAM_LOG(LogLevel::Debug, ("Resuming audio threads for MediaStreamGraph %p", mGraphImpl));
+  STREAM_LOG(LogLevel::Debug, ("Resuming audio threads for MediaStreamGraph %p", mGraphImpl.get()));
   if (cubeb_stream_start(mAudioStream) != CUBEB_OK) {
     NS_WARNING("Could not start cubeb stream for MSG.");
   }
@@ -830,7 +819,9 @@ AudioCallbackDriver::Revive()
     mGraphImpl->SetCurrentDriver(NextDriver());
     NextDriver()->Start();
   } else {
-    STREAM_LOG(LogLevel::Debug, ("Starting audio threads for MediaStreamGraph %p from a new thread.", mGraphImpl));
+    STREAM_LOG(LogLevel::Debug,
+               ("Starting audio threads for MediaStreamGraph %p from a new thread.",
+                mGraphImpl.get()));
     RefPtr<AsyncCubebTask> initEvent =
       new AsyncCubebTask(this, AsyncCubebOperation::INIT);
     initEvent->Dispatch();
diff --git a/dom/media/GraphDriver.h b/dom/media/GraphDriver.h
index 411e175d3..bb4f2689b 100644
--- a/dom/media/GraphDriver.h
+++ b/dom/media/GraphDriver.h
@@ -210,10 +210,8 @@ protected:
   // Time of the end of this graph iteration. This must be accessed while having
   // the monitor.
   GraphTime mIterationEnd;
-  // The MediaStreamGraphImpl that owns this driver. This has a lifetime longer
-  // than the driver, and will never be null. Hence, it can be accesed without
-  // monitor.
-  MediaStreamGraphImpl* mGraphImpl;
+  // The MediaStreamGraphImpl associated with this driver.
+  const RefPtr<MediaStreamGraphImpl> mGraphImpl;
 
   // This enum specifies the wait state of the driver.
   enum WaitState {
diff --git a/dom/media/MP3FrameParser.cpp b/dom/media/MP3FrameParser.cpp
deleted file mode 100644
index 242e3df00..000000000
--- a/dom/media/MP3FrameParser.cpp
+++ /dev/null
@@ -1,591 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include <algorithm>
-
-#include "nsMemory.h"
-#include "MP3FrameParser.h"
-#include "VideoUtils.h"
-
-
-#define FROM_BIG_ENDIAN(X) ((uint32_t)((uint8_t)(X)[0] << 24 | (uint8_t)(X)[1] << 16 | \
-                                       (uint8_t)(X)[2] << 8 | (uint8_t)(X)[3]))
-
-
-namespace mozilla {
-
-/*
- * Following code taken from http://www.hydrogenaudio.org/forums/index.php?showtopic=85125
- * with permission from the author, Nick Wallette <sirnickity@gmail.com>.
- */
-
-/* BEGIN shameless copy and paste */
-
-// Bitrates - use [version][layer][bitrate]
-const uint16_t mpeg_bitrates[4][4][16] = {
-  { // Version 2.5
-    { 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0, 0 }, // Reserved
-    { 0,   8,  16,  24,  32,  40,  48,  56,  64,  80,  96, 112, 128, 144, 160, 0 }, // Layer 3
-    { 0,   8,  16,  24,  32,  40,  48,  56,  64,  80,  96, 112, 128, 144, 160, 0 }, // Layer 2
-    { 0,  32,  48,  56,  64,  80,  96, 112, 128, 144, 160, 176, 192, 224, 256, 0 }  // Layer 1
-  },
-  { // Reserved
-    { 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0, 0 }, // Invalid
-    { 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0, 0 }, // Invalid
-    { 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0, 0 }, // Invalid
-    { 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0, 0 }  // Invalid
-  },
-  { // Version 2
-    { 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0, 0 }, // Reserved
-    { 0,   8,  16,  24,  32,  40,  48,  56,  64,  80,  96, 112, 128, 144, 160, 0 }, // Layer 3
-    { 0,   8,  16,  24,  32,  40,  48,  56,  64,  80,  96, 112, 128, 144, 160, 0 }, // Layer 2
-    { 0,  32,  48,  56,  64,  80,  96, 112, 128, 144, 160, 176, 192, 224, 256, 0 }  // Layer 1
-  },
-  { // Version 1
-    { 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0, 0 }, // Reserved
-    { 0,  32,  40,  48,  56,  64,  80,  96, 112, 128, 160, 192, 224, 256, 320, 0 }, // Layer 3
-    { 0,  32,  48,  56,  64,  80,  96, 112, 128, 160, 192, 224, 256, 320, 384, 0 }, // Layer 2
-    { 0,  32,  64,  96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 0 }, // Layer 1
-  }
-};
-
-// Sample rates - use [version][srate]
-const uint16_t mpeg_srates[4][4] = {
-    { 11025, 12000,  8000, 0 }, // MPEG 2.5
-    {     0,     0,     0, 0 }, // Reserved
-    { 22050, 24000, 16000, 0 }, // MPEG 2
-    { 44100, 48000, 32000, 0 }  // MPEG 1
-};
-
-// Samples per frame - use [version][layer]
-const uint16_t mpeg_frame_samples[4][4] = {
-//    Rsvd     3     2     1  < Layer  v Version
-    {    0,  576, 1152,  384 }, //       2.5
-    {    0,    0,    0,    0 }, //       Reserved
-    {    0,  576, 1152,  384 }, //       2
-    {    0, 1152, 1152,  384 }  //       1
-};
-
-// Slot size (MPEG unit of measurement) - use [layer]
-const uint8_t mpeg_slot_size[4] = { 0, 1, 1, 4 }; // Rsvd, 3, 2, 1
-
-uint16_t
-MP3Frame::CalculateLength()
-{
-  // Lookup real values of these fields
-  uint32_t  bitrate   = mpeg_bitrates[mVersion][mLayer][mBitrate] * 1000;
-  uint32_t  samprate  = mpeg_srates[mVersion][mSampleRate];
-  uint16_t  samples   = mpeg_frame_samples[mVersion][mLayer];
-  uint8_t   slot_size = mpeg_slot_size[mLayer];
-
-  // In-between calculations
-  float     bps       = (float)samples / 8.0;
-  float     fsize     = ( (bps * (float)bitrate) / (float)samprate )
-    + ( (mPad) ? slot_size : 0 );
-
-  // Frame sizes are truncated integers
-  return (uint16_t)fsize;
-}
-
-/* END shameless copy and paste */
-
-
-/** MP3Parser methods **/
-
-MP3Parser::MP3Parser()
-  : mCurrentChar(0)
-{ }
-
-void
-MP3Parser::Reset()
-{
-  mCurrentChar = 0;
-}
-
-uint16_t
-MP3Parser::ParseFrameLength(uint8_t ch)
-{
-  mData.mRaw[mCurrentChar] = ch;
-
-  MP3Frame &frame = mData.mFrame;
-
-  // Validate MP3 header as we read. We can't mistake the start of an MP3 frame
-  // for the middle of another frame due to the sync byte at the beginning
-  // of the frame.
-
-  // The only valid position for an all-high byte is the sync byte at the
-  // beginning of the frame.
-  if (ch == 0xff) {
-    mCurrentChar = 0;
-  }
-
-  // Make sure the current byte is valid in context. If not, reset the parser.
-  if (mCurrentChar == 2) {
-    if (frame.mBitrate == 0x0f) {
-      goto fail;
-    }
-  } else if (mCurrentChar == 1) {
-    if (frame.mSync2 != 0x07
-        || frame.mVersion == 0x01
-        || frame.mLayer == 0x00) {
-      goto fail;
-    }
-  }
-
-  // The only valid character at the beginning of the header is 0xff. Fail if
-  // it's different.
-  if (mCurrentChar == 0 && frame.mSync1 != 0xff) {
-    // Couldn't find the sync byte. Fail.
-    return 0;
-  }
-
-  mCurrentChar++;
-  MOZ_ASSERT(mCurrentChar <= sizeof(MP3Frame));
-
-  // Don't have a full header yet.
-  if (mCurrentChar < sizeof(MP3Frame)) {
-    return 0;
-  }
-
-  // Woo, valid header. Return the length.
-  mCurrentChar = 0;
-  return frame.CalculateLength();
-
-fail:
-  Reset();
-  return 0;
-}
-
-uint32_t
-MP3Parser::GetSampleRate()
-{
-  MP3Frame &frame = mData.mFrame;
-  return mpeg_srates[frame.mVersion][frame.mSampleRate];
-}
-
-uint32_t
-MP3Parser::GetSamplesPerFrame()
-{
-  MP3Frame &frame = mData.mFrame;
-  return mpeg_frame_samples[frame.mVersion][frame.mLayer];
-}
-
-
-/** ID3Parser methods **/
-
-const char sID3Head[3] = { 'I', 'D', '3' };
-const uint32_t ID3_HEADER_LENGTH = 10;
-const uint32_t ID3_FOOTER_LENGTH = 10;
-const uint8_t ID3_FOOTER_PRESENT = 0x10;
-
-ID3Parser::ID3Parser()
-  : mCurrentChar(0)
-  , mVersion(0)
-  , mFlags(0)
-  , mHeaderLength(0)
-{ }
-
-void
-ID3Parser::Reset()
-{
-  mCurrentChar = mVersion = mFlags = mHeaderLength = 0;
-}
-
-bool
-ID3Parser::ParseChar(char ch)
-{
-  switch (mCurrentChar) {
-    // The first three bytes of an ID3v2 header must match the string "ID3".
-    case 0: case 1: case 2:
-      if (ch != sID3Head[mCurrentChar]) {
-        goto fail;
-      }
-      break;
-    // The fourth and fifth bytes give the version, between 2 and 4.
-    case 3:
-      if (ch < '\2' || ch > '\4') {
-        goto fail;
-      }
-      mVersion = uint8_t(ch);
-      break;
-    case 4:
-      if (ch != '\0') {
-        goto fail;
-      }
-      break;
-    // The sixth byte gives the flags; valid flags depend on the version.
-    case 5:
-      if ((ch & (0xff >> mVersion)) != '\0') {
-        goto fail;
-      }
-      mFlags = uint8_t(ch);
-      break;
-    // Bytes seven through ten give the sum of the byte length of the extended
-    // header, the padding and the frames after unsynchronisation.
-    // These bytes form a 28-bit integer, with the high bit of each byte unset.
-    case 6: case 7: case 8: case 9:
-      if (ch & 0x80) {
-        goto fail;
-      }
-      mHeaderLength <<= 7;
-      mHeaderLength |= ch;
-      if (mCurrentChar == 9) {
-        mHeaderLength += ID3_HEADER_LENGTH;
-        mHeaderLength += (mFlags & ID3_FOOTER_PRESENT) ? ID3_FOOTER_LENGTH : 0;
-      }
-      break;
-    default:
-      MOZ_CRASH("Header already fully parsed!");
-  }
-
-  mCurrentChar++;
-
-  return IsParsed();
-
-fail:
-  if (mCurrentChar) {
-    Reset();
-    return ParseChar(ch);
-  }
-  Reset();
-  return false;
-}
-
-bool
-ID3Parser::IsParsed() const
-{
-  return mCurrentChar >= ID3_HEADER_LENGTH;
-}
-
-uint32_t
-ID3Parser::GetHeaderLength() const
-{
-  MOZ_ASSERT(IsParsed(),
-             "Queried length of ID3 header before parsing finished.");
-  return mHeaderLength;
-}
-
-
-/** VBR header helper stuff **/
-
-// Helper function to find a VBR header in an MP3 frame.
-// Based on information from
-// http://www.codeproject.com/Articles/8295/MPEG-Audio-Frame-Header
-
-const uint32_t VBRI_TAG = FROM_BIG_ENDIAN("VBRI");
-const uint32_t VBRI_OFFSET = 32 - sizeof(MP3Frame);
-const uint32_t VBRI_FRAME_COUNT_OFFSET = VBRI_OFFSET + 14;
-const uint32_t VBRI_MIN_FRAME_SIZE = VBRI_OFFSET + 26;
-
-const uint32_t XING_TAG = FROM_BIG_ENDIAN("Xing");
-enum XingFlags {
-  XING_HAS_NUM_FRAMES = 0x01,
-  XING_HAS_NUM_BYTES = 0x02,
-  XING_HAS_TOC = 0x04,
-  XING_HAS_VBR_SCALE = 0x08
-};
-
-static int64_t
-ParseXing(const char *aBuffer)
-{
-  uint32_t flags = FROM_BIG_ENDIAN(aBuffer + 4);
-
-  if (!(flags & XING_HAS_NUM_FRAMES)) {
-    NS_WARNING("VBR file without frame count. Duration estimation likely to "
-               "be totally wrong.");
-    return -1;
-  }
-
-  int64_t numFrames = -1;
-  if (flags & XING_HAS_NUM_FRAMES) {
-    numFrames = FROM_BIG_ENDIAN(aBuffer + 8);
-  }
-
-  return numFrames;
-}
-
-static int64_t
-FindNumVBRFrames(const nsCString& aFrame)
-{
-  const char *buffer = aFrame.get();
-  const char *bufferEnd = aFrame.get() + aFrame.Length();
-
-  // VBRI header is nice and well-defined; let's try to find that first.
-  if (aFrame.Length() > VBRI_MIN_FRAME_SIZE &&
-      FROM_BIG_ENDIAN(buffer + VBRI_OFFSET) == VBRI_TAG) {
-    return FROM_BIG_ENDIAN(buffer + VBRI_FRAME_COUNT_OFFSET);
-  }
-
-  // We have to search for the Xing header as its position can change.
-  for (; buffer + sizeof(XING_TAG) < bufferEnd; buffer++) {
-    if (FROM_BIG_ENDIAN(buffer) == XING_TAG) {
-      return ParseXing(buffer);
-    }
-  }
-
-  return -1;
-}
-
-
-/** MP3FrameParser methods **/
-
-// Some MP3's have large ID3v2 tags, up to 150KB, so we allow lots of
-// skipped bytes to be read, just in case, before we give up and assume
-// we're not parsing an MP3 stream.
-static const uint32_t MAX_SKIPPED_BYTES = 4096;
-
-enum {
-  MP3_HEADER_LENGTH   = 4,
-};
-
-MP3FrameParser::MP3FrameParser(int64_t aLength)
-: mLock("MP3FrameParser.mLock"),
-  mTotalID3Size(0),
-  mTotalFrameSize(0),
-  mFrameCount(0),
-  mOffset(0),
-  mLength(aLength),
-  mMP3Offset(-1),
-  mSamplesPerSecond(0),
-  mFirstFrameEnd(-1),
-  mIsMP3(MAYBE_MP3)
-{ }
-
-nsresult MP3FrameParser::ParseBuffer(const uint8_t* aBuffer,
-                                     uint32_t aLength,
-                                     int64_t aStreamOffset,
-                                     uint32_t* aOutBytesRead)
-{
-  // Iterate forwards over the buffer, looking for ID3 tag, or MP3
-  // Frame headers.
-  const uint8_t *buffer = aBuffer;
-  const uint8_t *bufferEnd = aBuffer + aLength;
-
-  // If we haven't found any MP3 frame data yet, there might be ID3 headers
-  // we can skip over.
-  if (mMP3Offset < 0) {
-    for (const uint8_t *ch = buffer; ch < bufferEnd; ch++) {
-      if (mID3Parser.ParseChar(*ch)) {
-        // Found an ID3 header. We don't care about the body of the header, so
-        // just skip past.
-        buffer = ch + mID3Parser.GetHeaderLength() - (ID3_HEADER_LENGTH - 1);
-
-        if (buffer <= ch) {
-          return NS_ERROR_FAILURE;
-        }
-
-        ch = buffer;
-
-        mTotalID3Size += mID3Parser.GetHeaderLength();
-
-        // Yes, this is an MP3!
-        mIsMP3 = DEFINITELY_MP3;
-
-        mID3Parser.Reset();
-      }
-    }
-  }
-
-  // The first MP3 frame in a variable bitrate stream can contain metadata
-  // for duration estimation and seeking, so we buffer that first frame here.
-  if (aStreamOffset < mFirstFrameEnd) {
-    uint64_t copyLen = std::min((int64_t)aLength, mFirstFrameEnd - aStreamOffset);
-    mFirstFrame.Append((const char *)buffer, copyLen);
-    buffer += copyLen;
-  }
-
-  while (buffer < bufferEnd) {
-    uint16_t frameLen = mMP3Parser.ParseFrameLength(*buffer);
-
-    if (frameLen) {
-      // We've found an MP3 frame!
-      // This is the first frame (and the only one we'll bother parsing), so:
-      // * Mark this stream as MP3;
-      // * Store the offset at which the MP3 data started; and
-      // * Start buffering the frame, as it might contain handy metadata.
-
-      // We're now sure this is an MP3 stream.
-      mIsMP3 = DEFINITELY_MP3;
-
-      // We need to know these to convert the number of frames in the stream
-      // to the length of the stream in seconds.
-      mSamplesPerSecond = mMP3Parser.GetSampleRate();
-      mSamplesPerFrame = mMP3Parser.GetSamplesPerFrame();
-
-      // If the stream has a constant bitrate, we should only need the length
-      // of the first frame and the length (in bytes) of the stream to
-      // estimate the length (in seconds).
-      mTotalFrameSize += frameLen;
-      mFrameCount++;
-
-      // If |mMP3Offset| isn't set then this is the first MP3 frame we have
-      // seen in the stream, which is useful for duration estimation.
-      if (mMP3Offset > -1) {
-        uint16_t skip = frameLen - sizeof(MP3Frame);
-        buffer += skip ? skip : 1;
-        continue;
-      }
-
-      // Remember the offset of the MP3 stream.
-      // We're at the last byte of an MP3Frame, so MP3 data started
-      // sizeof(MP3Frame) - 1 bytes ago.
-      mMP3Offset = aStreamOffset
-        + (buffer - aBuffer)
-        - (sizeof(MP3Frame) - 1);
-
-      buffer++;
-
-      // If the stream has a variable bitrate, the first frame has metadata
-      // we need for duration estimation and seeking. Start buffering it so we
-      // can parse it later.
-      mFirstFrameEnd = mMP3Offset + frameLen;
-      uint64_t currOffset = buffer - aBuffer + aStreamOffset;
-      uint64_t copyLen = std::min(mFirstFrameEnd - currOffset,
-                                  (uint64_t)(bufferEnd - buffer));
-      mFirstFrame.Append((const char *)buffer, copyLen);
-
-      buffer += copyLen;
-
-    } else {
-      // Nothing to see here. Move along.
-      buffer++;
-    }
-  }
-
-  *aOutBytesRead = buffer - aBuffer;
-
-  if (mFirstFrameEnd > -1 && mFirstFrameEnd <= aStreamOffset + buffer - aBuffer) {
-    // We have our whole first frame. Try to find a VBR header.
-    mNumFrames = FindNumVBRFrames(mFirstFrame);
-    mFirstFrameEnd = -1;
-  }
-
-  return NS_OK;
-}
-
-void MP3FrameParser::Parse(const uint8_t* aBuffer, uint32_t aLength, uint64_t aOffset)
-{
-  MutexAutoLock mon(mLock);
-
-  if (HasExactDuration()) {
-    // We know the duration; nothing to do here.
-    return;
-  }
-
-  const uint8_t* buffer = aBuffer;
-  int32_t length = aLength;
-  uint64_t offset = aOffset;
-
-  // Got some data we have seen already. Skip forward to what we need.
-  if (aOffset < mOffset) {
-    buffer += mOffset - aOffset;
-    length -= mOffset - aOffset;
-    offset = mOffset;
-
-    if (length <= 0) {
-      return;
-    }
-  }
-
-  // If there is a discontinuity in the input stream, reset the state of the
-  // parsers so we don't get any partial headers.
-  if (mOffset < aOffset) {
-    if (!mID3Parser.IsParsed()) {
-      // Only reset this if it hasn't finished yet.
-      mID3Parser.Reset();
-    }
-
-    if (mFirstFrameEnd > -1) {
-      NS_WARNING("Discontinuity in input while buffering first frame.");
-      mFirstFrameEnd = -1;
-    }
-
-    mMP3Parser.Reset();
-  }
-
-  uint32_t bytesRead = 0;
-  if (NS_FAILED(ParseBuffer(buffer,
-                            length,
-                            offset,
-                            &bytesRead))) {
-    return;
-  }
-
-  MOZ_ASSERT(length <= (int)bytesRead, "All bytes should have been consumed");
-
-  // Update next data offset
-  mOffset = offset + bytesRead;
-
-  // If we've parsed lots of data and we still have nothing, just give up.
-  // We don't count ID3 headers towards the skipped bytes count, as MP3 files
-  // can have massive ID3 sections.
-  if (!mID3Parser.IsParsed() && mMP3Offset < 0 &&
-      mOffset - mTotalID3Size > MAX_SKIPPED_BYTES) {
-    mIsMP3 = NOT_MP3;
-  }
-}
-
-int64_t MP3FrameParser::GetDuration()
-{
-  MutexAutoLock mon(mLock);
-
-  if (!ParsedHeaders() || !mSamplesPerSecond) {
-    // Not a single frame decoded yet.
-    return -1;
-  }
-
-  MOZ_ASSERT(mFrameCount > 0 && mTotalFrameSize > 0,
-             "Frame parser should have seen at least one MP3 frame of positive length.");
-
-  if (!mFrameCount || !mTotalFrameSize) {
-    // This should never happen.
-    return -1;
-  }
-
-  double frames;
-  if (mNumFrames < 0) {
-    // Estimate the number of frames in the stream based on the average frame
-    // size and the length of the MP3 file.
-    double frameSize = (double)mTotalFrameSize / mFrameCount;
-    frames = (double)(mLength - mMP3Offset) / frameSize;
-  } else {
-    // We know the exact number of frames from the VBR header.
-    frames = mNumFrames;
-  }
-
-  // The duration of each frame is constant over a given stream.
-  double usPerFrame = USECS_PER_S * mSamplesPerFrame / mSamplesPerSecond;
-
-  return frames * usPerFrame;
-}
-
-int64_t MP3FrameParser::GetMP3Offset()
-{
-  MutexAutoLock mon(mLock);
-  return mMP3Offset;
-}
-
-bool MP3FrameParser::ParsedHeaders()
-{
-  // We have seen both the beginning and the end of the first MP3 frame in the
-  // stream.
-  return mMP3Offset > -1 && mFirstFrameEnd < 0;
-}
-
-bool MP3FrameParser::HasExactDuration()
-{
-  return ParsedHeaders() && mNumFrames > -1;
-}
-
-bool MP3FrameParser::NeedsData()
-{
-  // If we don't know the duration exactly then either:
-  //  - we're still waiting for a VBR header; or
-  //  - we look at all frames to constantly update our duration estimate.
-  return IsMP3() && !HasExactDuration();
-}
-
-} // namespace mozilla
diff --git a/dom/media/MP3FrameParser.h b/dom/media/MP3FrameParser.h
deleted file mode 100644
index d2ba791fd..000000000
--- a/dom/media/MP3FrameParser.h
+++ /dev/null
@@ -1,219 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef MP3FrameParser_h
-#define MP3FrameParser_h
-
-#include <stdint.h>
-
-#include "mozilla/Mutex.h"
-#include "nsString.h"
-#include "Intervals.h"
-
-namespace mozilla {
-
-// Simple parser to tell whether we've found an ID3 header and how long it is,
-// so that we can skip it.
-// XXX maybe actually parse this stuff?
-class ID3Parser
-{
-public:
-  ID3Parser();
-
-  void Reset();
-  bool ParseChar(char ch);
-  bool IsParsed() const;
-  uint32_t GetHeaderLength() const;
-
-private:
-  uint32_t mCurrentChar;
-  uint8_t mVersion;
-  uint8_t mFlags;
-  uint32_t mHeaderLength;
-};
-
-struct MP3Frame {
-  uint16_t mSync1 : 8;      // Always all set
-  uint16_t mProtected : 1;  // Ignored
-  uint16_t mLayer : 2;
-  uint16_t mVersion : 2;
-  uint16_t mSync2 : 3;      // Always all set
-  uint16_t mPrivate : 1;    // Ignored
-  uint16_t mPad : 1;
-  uint16_t mSampleRate : 2; // Index into mpeg_srates above
-  uint16_t mBitrate : 4;    // Index into mpeg_bitrates above
-
-  uint16_t CalculateLength();
-};
-
-// Buffering parser for MP3 frames.
-class MP3Parser
-{
-public:
-  MP3Parser();
-
-  // Forget all data the parser has seen so far.
-  void Reset();
-
-  // Parse the given byte. If we have found a frame header, return the length of
-  // the frame.
-  uint16_t ParseFrameLength(uint8_t ch);
-
-  // Get the sample rate from the current header.
-  uint32_t GetSampleRate();
-
-  // Get the number of samples per frame.
-  uint32_t GetSamplesPerFrame();
-
-private:
-  uint32_t mCurrentChar;
-  union {
-    uint8_t mRaw[3];
-    MP3Frame mFrame;
-  } mData;
-};
-
-
-// A description of the MP3 format and its extensions is available at
-//
-//  http://www.codeproject.com/Articles/8295/MPEG-Audio-Frame-Header
-//
-// The data in MP3 streams is split into small frames, with each frame
-// containing a fixed number of samples. The duration of a frame depends
-// on the frame's bit rate and sample rate. Both values can vary among
-// frames, so it is necessary to examine each individual frame of an MP3
-// stream to calculate the stream's overall duration.
-//
-// The MP3 frame parser extracts information from an MP3 data stream. It
-// accepts a range of frames of an MP3 stream as input, and parses all
-// frames for their duration. Callers can query the stream's overall
-// duration from the parser.
-//
-// Call the methods NotifyDataArrived or Parse to add new data. If you added
-// information for a certain stream position, you cannot go back to previous
-// positions. The parser will simply ignore the input. If you skip stream
-// positions, the duration of the related MP3 frames will be estimated from
-// the stream's average.
-//
-// The method GetDuration returns calculated duration of the stream, including
-// estimates for skipped ranges.
-//
-// All public methods are thread-safe.
-
-class MP3FrameParser
-{
-public:
-  explicit MP3FrameParser(int64_t aLength=-1);
-
-  bool IsMP3() {
-    MutexAutoLock mon(mLock);
-    return mIsMP3 != NOT_MP3;
-  }
-
-  void Parse(const uint8_t* aBuffer, uint32_t aLength, uint64_t aStreamOffset);
-
-  // Returns the duration, in microseconds. If the entire stream has not
-  // been parsed yet, this is an estimate based on the bitrate of the
-  // frames parsed so far.
-  int64_t GetDuration();
-
-  // Returns the offset of the first MP3 frame in the stream, or -1 of
-  // no MP3 frame has been detected yet.
-  int64_t GetMP3Offset();
-
-  // Returns true if we've seen the whole first frame of the MP3 stream, and
-  // therefore can make an estimate on the stream duration.
-  // Otherwise, returns false.
-  bool ParsedHeaders();
-
-  // Returns true if we know the exact duration of the MP3 stream;
-  // false otherwise.
-  bool HasExactDuration();
-
-  // Returns true if the parser needs more data for duration estimation.
-  bool NeedsData();
-  // Assign the total lenght of this mp3 stream
-  void SetLength(int64_t aLength) {
-    MutexAutoLock mon(mLock);
-    mLength = aLength;
-  }
-private:
-
-  // Parses aBuffer, starting at offset 0. Returns the number of bytes
-  // parsed, relative to the start of the buffer. Note this may be
-  // greater than aLength if the headers in the buffer indicate that
-  // the frame or ID3 tag extends outside of aBuffer. Returns failure
-  // if too many non-MP3 bytes are parsed.
-  nsresult ParseBuffer(const uint8_t* aBuffer,
-                       uint32_t aLength,
-                       int64_t aStreamOffset,
-                       uint32_t* aOutBytesRead);
-
-  // A low-contention lock for protecting the parser results
-  Mutex mLock;
-
-  // ID3 header parser. Keeps state between reads in case the header falls
-  // in between.
-  ID3Parser mID3Parser;
-
-  // MP3 frame header parser.
-  MP3Parser mMP3Parser;
-
-  // If we read |MAX_SKIPPED_BYTES| from the stream without finding any MP3
-  // frames, we give up and report |NOT_MP3|. Here we track the cumulative size
-  // of any ID3 headers we've seen so big ID3 sections aren't counted towards
-  // skipped bytes.
-  uint32_t mTotalID3Size;
-
-  // All fields below are protected by mLock
-
-  // We keep stats on the size of all the frames we've seen, as well as how many
-  // so that we can estimate the duration of the rest of the stream.
-  uint64_t mTotalFrameSize;
-  uint64_t mFrameCount;
-
-  // Offset of the last data parsed. This is the end offset of the last data
-  // block parsed, so it's the start offset we expect to get on the next
-  // call to Parse().
-  uint64_t mOffset;
-
-  // Total length of the stream in bytes.
-  int64_t mLength;
-
-  // Offset of first MP3 frame in the bitstream. Has value -1 until the
-  // first MP3 frame is found.
-  int64_t mMP3Offset;
-
-  // The exact number of frames in this stream, if we know it. -1 otherwise.
-  int64_t mNumFrames;
-
-  // Number of audio samples per second and per frame. Fixed through the whole
-  // file. If we know these variables as well as the number of frames in the
-  // file, we can get an exact duration for the stream.
-  uint16_t mSamplesPerSecond;
-  uint16_t mSamplesPerFrame;
-
-  // If the MP3 has a variable bitrate, then there *should* be metadata about
-  // the encoding in the first frame. We buffer the first frame here.
-  nsCString mFirstFrame;
-
-  // While we are reading the first frame, this is the stream offset of the
-  // last byte of that frame. -1 at all other times.
-  int64_t mFirstFrameEnd;
-
-  enum eIsMP3 {
-    MAYBE_MP3, // We're giving the stream the benefit of the doubt...
-    DEFINITELY_MP3, // We've hit at least one ID3 tag or MP3 frame.
-    NOT_MP3 // Not found any evidence of the stream being MP3.
-  };
-
-  eIsMP3 mIsMP3;
-
-};
-
-} // namespace mozilla
-
-#endif
diff --git a/dom/media/MediaData.h b/dom/media/MediaData.h
index a79aac6ed..905b4c1d9 100644
--- a/dom/media/MediaData.h
+++ b/dom/media/MediaData.h
@@ -14,6 +14,7 @@
 #include "nsIMemoryReporter.h"
 #include "SharedBuffer.h"
 #include "mozilla/RefPtr.h"
+#include "mozilla/Span.h"
 #include "mozilla/UniquePtr.h"
 #include "mozilla/UniquePtrExtensions.h"
 #include "nsTArray.h"
@@ -631,6 +632,8 @@ public:
   {
     return sizeof(*this) + mBuffer.ComputedSizeOfExcludingThis();
   }
+  // Access the buffer as a Span.
+  operator Span<const uint8_t>() { return MakeSpan(Data(), Size()); }
 
   const CryptoSample& mCrypto;
   RefPtr<MediaByteBuffer> mExtraData;
diff --git a/dom/media/MediaDecoder.cpp b/dom/media/MediaDecoder.cpp
index 9334d1bcb..223c59c3b 100644
--- a/dom/media/MediaDecoder.cpp
+++ b/dom/media/MediaDecoder.cpp
@@ -30,15 +30,10 @@
 #include "mozilla/dom/VideoTrack.h"
 #include "mozilla/dom/VideoTrackList.h"
 #include "nsPrintfCString.h"
-#include "mozilla/Telemetry.h"
 #include "GMPService.h"
 #include "Layers.h"
 #include "mozilla/layers/ShadowLayers.h"
 
-#ifdef MOZ_ANDROID_OMX
-#include "AndroidBridge.h"
-#endif
-
 using namespace mozilla::dom;
 using namespace mozilla::layers;
 using namespace mozilla::media;
@@ -425,7 +420,6 @@ MediaDecoder::MediaDecoder(MediaDecoderOwner* aOwner)
   , INIT_CANONICAL(mPlaybackRateReliable, true)
   , INIT_CANONICAL(mDecoderPosition, 0)
   , INIT_CANONICAL(mIsVisible, !aOwner->IsHidden())
-  , mTelemetryReported(false)
 {
   MOZ_COUNT_CTOR(MediaDecoder);
   MOZ_ASSERT(NS_IsMainThread());
@@ -845,42 +839,6 @@ MediaDecoder::MetadataLoaded(nsAutoPtr<MediaInfo> aInfo,
   // So we call Invalidate() after calling mOwner->MetadataLoaded to ensure
   // the media element has the latest dimensions.
   Invalidate();
-
-  EnsureTelemetryReported();
-}
-
-void
-MediaDecoder::EnsureTelemetryReported()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-
-  if (mTelemetryReported || !mInfo) {
-    // Note: sometimes we get multiple MetadataLoaded calls (for example
-    // for chained ogg). So we ensure we don't report duplicate results for
-    // these resources.
-    return;
-  }
-
-  nsTArray<nsCString> codecs;
-  if (mInfo->HasAudio() && !mInfo->mAudio.GetAsAudioInfo()->mMimeType.IsEmpty()) {
-    codecs.AppendElement(mInfo->mAudio.GetAsAudioInfo()->mMimeType);
-  }
-  if (mInfo->HasVideo() && !mInfo->mVideo.GetAsVideoInfo()->mMimeType.IsEmpty()) {
-    codecs.AppendElement(mInfo->mVideo.GetAsVideoInfo()->mMimeType);
-  }
-  if (codecs.IsEmpty()) {
-    if (mResource->GetContentType().IsEmpty()) {
-      NS_WARNING("Somehow the resource's content type is empty");
-      return;
-    }
-    codecs.AppendElement(nsPrintfCString("resource; %s", mResource->GetContentType().get()));
-  }
-  for (const nsCString& codec : codecs) {
-    DECODER_LOG("Telemetry MEDIA_CODEC_USED= '%s'", codec.get());
-    Telemetry::Accumulate(Telemetry::ID::MEDIA_CODEC_USED, codec);
-  }
-
-  mTelemetryReported = true;
 }
 
 const char*
@@ -1618,16 +1576,6 @@ MediaDecoder::IsWebMEnabled()
   return Preferences::GetBool("media.webm.enabled");
 }
 
-#ifdef MOZ_ANDROID_OMX
-bool
-MediaDecoder::IsAndroidMediaPluginEnabled()
-{
-  return AndroidBridge::Bridge() &&
-         AndroidBridge::Bridge()->GetAPIVersion() < 16 &&
-         Preferences::GetBool("media.plugins.enabled");
-}
-#endif
-
 NS_IMETHODIMP
 MediaMemoryTracker::CollectReports(nsIHandleReportCallback* aHandleReport,
                                    nsISupports* aData, bool aAnonymize)
diff --git a/dom/media/MediaDecoder.h b/dom/media/MediaDecoder.h
index a4edcbe72..05e88db8b 100644
--- a/dom/media/MediaDecoder.h
+++ b/dom/media/MediaDecoder.h
@@ -440,17 +440,11 @@ private:
 
   void SetCDMProxy(CDMProxy* aProxy);
 
-  void EnsureTelemetryReported();
-
   static bool IsOggEnabled();
   static bool IsOpusEnabled();
   static bool IsWaveEnabled();
   static bool IsWebMEnabled();
 
-#ifdef MOZ_ANDROID_OMX
-  static bool IsAndroidMediaPluginEnabled();
-#endif
-
 #ifdef MOZ_WMF
   static bool IsWMFEnabled();
 #endif
@@ -856,8 +850,6 @@ private:
   // download has ended. Called on the main thread only. aStatus is
   // the result from OnStopRequest.
   void NotifyDownloadEnded(nsresult aStatus);
-
-  bool mTelemetryReported;
 };
 
 } // namespace mozilla
diff --git a/dom/media/MediaDecoderStateMachine.cpp b/dom/media/MediaDecoderStateMachine.cpp
index c586139ad..2ed1956c9 100644
--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -1173,60 +1173,12 @@ StateObject::HandleShutdown()
   return SetState<ShutdownState>();
 }
 
-static void
-ReportRecoveryTelemetry(const TimeStamp& aRecoveryStart,
-                        const MediaInfo& aMediaInfo,
-                        bool aIsHardwareAccelerated)
-{
-  MOZ_ASSERT(NS_IsMainThread());
-  if (!aMediaInfo.HasVideo()) {
-    return;
-  }
-
-  // Keyed by audio+video or video alone, hardware acceleration,
-  // and by a resolution range.
-  nsCString key(aMediaInfo.HasAudio() ? "AV" : "V");
-  key.AppendASCII(aIsHardwareAccelerated ? "(hw)," : ",");
-  static const struct { int32_t mH; const char* mRes; } sResolutions[] = {
-    {  240, "0-240" },
-    {  480, "241-480" },
-    {  720, "481-720" },
-    { 1080, "721-1080" },
-    { 2160, "1081-2160" }
-  };
-  const char* resolution = "2161+";
-  int32_t height = aMediaInfo.mVideo.mImage.height;
-  for (const auto& res : sResolutions) {
-    if (height <= res.mH) {
-      resolution = res.mRes;
-      break;
-    }
-  }
-  key.AppendASCII(resolution);
-
-  TimeDuration duration = TimeStamp::Now() - aRecoveryStart;
-  double duration_ms = duration.ToMilliseconds();
-  Telemetry::Accumulate(Telemetry::VIDEO_SUSPEND_RECOVERY_TIME_MS,
-                        key,
-                        uint32_t(duration_ms + 0.5));
-  Telemetry::Accumulate(Telemetry::VIDEO_SUSPEND_RECOVERY_TIME_MS,
-                        NS_LITERAL_CSTRING("All"),
-                        uint32_t(duration_ms + 0.5));
-}
-
 void
 MediaDecoderStateMachine::
 StateObject::HandleResumeVideoDecoding()
 {
   MOZ_ASSERT(mMaster->mVideoDecodeSuspended);
 
-  // Start counting recovery time from right now.
-  TimeStamp start = TimeStamp::Now();
-
-  // Local reference to mInfo, so that it will be copied in the lambda below.
-  auto& info = Info();
-  bool hw = Reader()->VideoIsHardwareAccelerated();
-
   // Start video-only seek to the current time.
   SeekJob seekJob;
 
@@ -1238,10 +1190,7 @@ StateObject::HandleResumeVideoDecoding()
                                type,
                                true /* aVideoOnly */);
 
-  SetState<SeekingState>(Move(seekJob), EventVisibility::Suppressed)->Then(
-    AbstractThread::MainThread(), __func__,
-    [start, info, hw](){ ReportRecoveryTelemetry(start, info, hw); },
-    [](){});
+  SetState<SeekingState>(Move(seekJob), EventVisibility::Suppressed);
 }
 
 void
diff --git a/dom/media/MediaFormatReader.cpp b/dom/media/MediaFormatReader.cpp
index 06e8b963b..773434710 100644
--- a/dom/media/MediaFormatReader.cpp
+++ b/dom/media/MediaFormatReader.cpp
@@ -32,6 +32,10 @@ using mozilla::layers::Image;
 using mozilla::layers::LayerManager;
 using mozilla::layers::LayersBackend;
 
+// avoid redefined macro warning in unified builds
+#undef LOG
+#undef LOGV
+
 static mozilla::LazyLogModule sFormatDecoderLog("MediaFormatReader");
 mozilla::LazyLogModule gMediaDemuxerLog("MediaDemuxer");
 
diff --git a/dom/media/MediaManager.cpp b/dom/media/MediaManager.cpp
index ba6b4cd47..979cb64c7 100644
--- a/dom/media/MediaManager.cpp
+++ b/dom/media/MediaManager.cpp
@@ -32,7 +32,6 @@
 #include "nsAppDirectoryServiceDefs.h"
 #include "nsIInputStream.h"
 #include "nsILineInputStream.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/Types.h"
 #include "mozilla/PeerIdentity.h"
 #include "mozilla/dom/ContentChild.h"
@@ -2034,7 +2033,6 @@ MediaManager::GetUserMedia(nsPIDOMWindowInner* aWindow,
   }
 
   // Determine permissions early (while we still have a stack).
-
   nsIURI* docURI = aWindow->GetDocumentURI();
   if (!docURI) {
     return NS_ERROR_UNEXPECTED;
@@ -2044,48 +2042,23 @@ MediaManager::GetUserMedia(nsPIDOMWindowInner* aWindow,
       Preferences::GetBool("media.navigator.permission.disabled", false);
   bool isHTTPS = false;
   docURI->SchemeIs("https", &isHTTPS);
-  nsCString host;
-  nsresult rv = docURI->GetHost(host);
-  // Test for some other schemes that ServiceWorker recognizes
-  bool isFile;
-  docURI->SchemeIs("file", &isFile);
-  bool isApp;
-  docURI->SchemeIs("app", &isApp);
-  // Same localhost check as ServiceWorkers uses
-  // (see IsOriginPotentiallyTrustworthy())
-  bool isLocalhost = NS_SUCCEEDED(rv) &&
-                     (host.LowerCaseEqualsLiteral("localhost") ||
-                      host.LowerCaseEqualsLiteral("127.0.0.1") ||
-                      host.LowerCaseEqualsLiteral("::1"));
-
-  // Record telemetry about whether the source of the call was secure, i.e.,
-  // privileged or HTTPS.  We may handle other cases
-if (privileged) {
-    Telemetry::Accumulate(Telemetry::WEBRTC_GET_USER_MEDIA_SECURE_ORIGIN,
-                          (uint32_t) GetUserMediaSecurityState::Privileged);
-  } else if (isHTTPS) {
-    Telemetry::Accumulate(Telemetry::WEBRTC_GET_USER_MEDIA_SECURE_ORIGIN,
-                          (uint32_t) GetUserMediaSecurityState::HTTPS);
-  } else if (isFile) {
-    Telemetry::Accumulate(Telemetry::WEBRTC_GET_USER_MEDIA_SECURE_ORIGIN,
-                          (uint32_t) GetUserMediaSecurityState::File);
-  } else if (isApp) {
-    Telemetry::Accumulate(Telemetry::WEBRTC_GET_USER_MEDIA_SECURE_ORIGIN,
-                          (uint32_t) GetUserMediaSecurityState::App);
-  } else if (isLocalhost) {
-    Telemetry::Accumulate(Telemetry::WEBRTC_GET_USER_MEDIA_SECURE_ORIGIN,
-                          (uint32_t) GetUserMediaSecurityState::Localhost);
-  } else {
-    Telemetry::Accumulate(Telemetry::WEBRTC_GET_USER_MEDIA_SECURE_ORIGIN,
-                          (uint32_t) GetUserMediaSecurityState::Other);
-  }
 
   nsCString origin;
-  rv = nsPrincipal::GetOriginForURI(docURI, origin);
+  nsresult rv = nsPrincipal::GetOriginForURI(docURI, origin);
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }
 
+  // Disallow access to null principal pages
+  nsCOMPtr<nsIPrincipal> principal = aWindow->GetExtantDoc()->NodePrincipal();
+  if (principal->GetIsNullPrincipal()) {
+    RefPtr<MediaStreamError> error =
+        new MediaStreamError(aWindow,
+                             NS_LITERAL_STRING("NotAllowedError"));
+    onFailure->OnError(error);
+    return NS_OK;
+  }
+  
   if (!Preferences::GetBool("media.navigator.video.enabled", true)) {
     c.mVideo.SetAsBoolean() = false;
   }
@@ -2098,8 +2071,6 @@ if (privileged) {
     videoType = StringToEnum(dom::MediaSourceEnumValues::strings,
                              vc.mMediaSource,
                              MediaSourceEnum::Other);
-    Telemetry::Accumulate(Telemetry::WEBRTC_GET_USER_MEDIA_TYPE,
-                          (uint32_t) videoType);
     switch (videoType) {
       case MediaSourceEnum::Camera:
         break;
@@ -2182,8 +2153,6 @@ if (privileged) {
       ac.mMediaSource.AssignASCII(EnumToASCII(dom::MediaSourceEnumValues::strings,
                                               audioType));
     }
-    Telemetry::Accumulate(Telemetry::WEBRTC_GET_USER_MEDIA_TYPE,
-                          (uint32_t) audioType);
 
     switch (audioType) {
       case MediaSourceEnum::Microphone:
@@ -2229,7 +2198,6 @@ if (privileged) {
   StreamListeners* listeners = AddWindowID(windowID);
 
   // Create a disabled listener to act as a placeholder
-  nsIPrincipal* principal = aWindow->GetExtantDoc()->NodePrincipal();
   RefPtr<GetUserMediaCallbackMediaStreamListener> listener =
     new GetUserMediaCallbackMediaStreamListener(mMediaThread, windowID,
                                                 MakePrincipalHandle(principal));
diff --git a/dom/media/MediaPrefs.h b/dom/media/MediaPrefs.h
index b237ecd3d..c67a89989 100644
--- a/dom/media/MediaPrefs.h
+++ b/dom/media/MediaPrefs.h
@@ -105,9 +105,6 @@ private:
   DECL_MEDIA_PREF("media.eme.enabled",                        EMEEnabled, bool, false);
   DECL_MEDIA_PREF("media.use-blank-decoder",                  PDMUseBlankDecoder, bool, false);
   DECL_MEDIA_PREF("media.gpu-process-decoder",                PDMUseGPUDecoder, bool, false);
-#ifdef MOZ_GONK_MEDIACODEC
-  DECL_MEDIA_PREF("media.gonk.enabled",                       PDMGonkDecoderEnabled, bool, true);
-#endif
 #ifdef MOZ_WIDGET_ANDROID
   DECL_MEDIA_PREF("media.android-media-codec.enabled",        PDMAndroidMediaCodecEnabled, bool, false);
   DECL_MEDIA_PREF("media.android-media-codec.preferred",      PDMAndroidMediaCodecPreferred, bool, false);
@@ -120,6 +117,9 @@ private:
 #ifdef MOZ_FFVPX
   DECL_MEDIA_PREF("media.ffvpx.enabled",                      PDMFFVPXEnabled, bool, true);
 #endif
+#ifdef MOZ_AV1
+  DECL_MEDIA_PREF("media.av1.enabled",                        AV1Enabled, bool, false);
+#endif
 #ifdef XP_WIN
   DECL_MEDIA_PREF("media.wmf.enabled",                        PDMWMFEnabled, bool, true);
   DECL_MEDIA_PREF("media.wmf.skip-blacklist",                 PDMWMFSkipBlacklist, bool, false);
diff --git a/dom/media/MediaStreamGraph.cpp b/dom/media/MediaStreamGraph.cpp
index e2934cbb2..1b9e4f674 100644
--- a/dom/media/MediaStreamGraph.cpp
+++ b/dom/media/MediaStreamGraph.cpp
@@ -3371,7 +3371,8 @@ MediaStreamGraphImpl::Destroy()
   // First unregister from memory reporting.
   UnregisterWeakMemoryReporter(this);
 
-  // Clear the self reference which will destroy this instance.
+  // Clear the self reference which will destroy this instance if all
+  // associated GraphDrivers are destroyed.
   mSelfRef = nullptr;
 }
 
diff --git a/dom/media/ThreadPoolCOMListener.h b/dom/media/ThreadPoolCOMListener.h
index 881013a78..424ca65d2 100644
--- a/dom/media/ThreadPoolCOMListener.h
+++ b/dom/media/ThreadPoolCOMListener.h
@@ -13,8 +13,8 @@
 namespace mozilla {
 
 // Thread pool listener which ensures that MSCOM is initialized and
-// deinitialized on the thread pool thread. We may call into WMF or
-// DirectShow on this thread, so we need MSCOM working.
+// deinitialized on the thread pool thread. We may call into WMF on
+// this thread, so we need MSCOM working.
 class MSCOMInitThreadPoolListener final : public nsIThreadPoolListener {
   ~MSCOMInitThreadPoolListener() {}
   public:
diff --git a/dom/media/VideoFrameContainer.cpp b/dom/media/VideoFrameContainer.cpp
index 2b1965766..56aea9d27 100644
--- a/dom/media/VideoFrameContainer.cpp
+++ b/dom/media/VideoFrameContainer.cpp
@@ -61,7 +61,7 @@ void VideoFrameContainer::UpdatePrincipalHandleForFrameIDLocked(const PrincipalH
   mFrameIDForPendingPrincipalHandle = aFrameID;
 }
 
-static void
+static bool
 SetImageToBlackPixel(PlanarYCbCrImage* aImage)
 {
   uint8_t blackPixel[] = { 0x10, 0x80, 0x80 };
@@ -72,7 +72,7 @@ SetImageToBlackPixel(PlanarYCbCrImage* aImage)
   data.mCrChannel = blackPixel + 2;
   data.mYStride = data.mCbCrStride = 1;
   data.mPicSize = data.mYSize = data.mCbCrSize = gfx::IntSize(1, 1);
-  aImage->CopyData(data);
+  return aImage->CopyData(data);
 }
 
 class VideoFrameContainerInvalidateRunnable : public Runnable {
@@ -122,11 +122,13 @@ void VideoFrameContainer::SetCurrentFrames(const VideoSegment& aSegment)
 
     if (frame->GetForceBlack()) {
       if (!mBlackImage) {
-        mBlackImage = GetImageContainer()->CreatePlanarYCbCrImage();
-        if (mBlackImage) {
+        RefPtr<Image> blackImage = GetImageContainer()->CreatePlanarYCbCrImage();
+        if (blackImage) {
           // Sets the image to a single black pixel, which will be scaled to
           // fill the rendered size.
-          SetImageToBlackPixel(mBlackImage->AsPlanarYCbCrImage());
+          if (SetImageToBlackPixel(blackImage->AsPlanarYCbCrImage())) { 
+            mBlackImage = blackImage;
+          }
         }
       }
       if (mBlackImage) {
diff --git a/dom/media/VideoUtils.cpp b/dom/media/VideoUtils.cpp
index 5c00e54bc..c06ba9070 100644
--- a/dom/media/VideoUtils.cpp
+++ b/dom/media/VideoUtils.cpp
@@ -6,7 +6,6 @@
 
 #include "mozilla/Base64.h"
 #include "mozilla/TaskQueue.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/Function.h"
 
 #include "MediaContentType.h"
@@ -208,8 +207,20 @@ already_AddRefed<SharedThreadPool> GetMediaThreadPool(MediaThreadType aType)
       name = "MediaPlayback";
       break;
   }
-  return SharedThreadPool::
+  RefPtr<SharedThreadPool> pool = SharedThreadPool::
     Get(nsDependentCString(name), MediaPrefs::MediaThreadPoolDefaultCount());
+
+  // Ensure a larger stack for platform decoder threads
+  if (aType == MediaThreadType::PLATFORM_DECODER) {
+    const uint32_t minStackSize = 512*1024;
+    uint32_t stackSize;
+    MOZ_ALWAYS_SUCCEEDS(pool->GetThreadStackSize(&stackSize));
+    if (stackSize < minStackSize) {
+      MOZ_ALWAYS_SUCCEEDS(pool->SetThreadStackSize(minStackSize));
+    }
+  }
+
+  return pool.forget();
 }
 
 bool
@@ -248,24 +259,6 @@ ExtractH264CodecDetails(const nsAString& aCodec,
     aLevel *= 10;
   }
 
-  // Capture the constraint_set flag value for the purpose of Telemetry.
-  // We don't NS_ENSURE_SUCCESS here because ExtractH264CodecDetails doesn't
-  // care about this, but we make sure constraints is above 4 (constraint_set5_flag)
-  // otherwise collect 0 for unknown.
-  uint8_t constraints = PromiseFlatString(Substring(aCodec, 7, 2)).ToInteger(&rv, 16);
-  Telemetry::Accumulate(Telemetry::VIDEO_CANPLAYTYPE_H264_CONSTRAINT_SET_FLAG,
-                        constraints >= 4 ? constraints : 0);
-
-  // 244 is the highest meaningful profile value (High 4:4:4 Intra Profile)
-  // that can be represented as single hex byte, otherwise collect 0 for unknown.
-  Telemetry::Accumulate(Telemetry::VIDEO_CANPLAYTYPE_H264_PROFILE,
-                        aProfile <= 244 ? aProfile : 0);
-
-  // Make sure aLevel represents a value between levels 1 and 5.2,
-  // otherwise collect 0 for unknown.
-  Telemetry::Accumulate(Telemetry::VIDEO_CANPLAYTYPE_H264_LEVEL,
-                        (aLevel >= 10 && aLevel <= 52) ? aLevel : 0);
-
   return true;
 }
 
@@ -445,6 +438,16 @@ ParseMIMETypeString(const nsAString& aMIMEType,
   return ParseCodecsString(codecsStr, aOutCodecs);
 }
 
+template <int N>
+static bool
+StartsWith(const nsACString& string, const char (&prefix)[N])
+{
+    if (N - 1 > string.Length()) {
+      return false;
+    }
+    return memcmp(string.Data(), prefix, N - 1) == 0;
+}
+
 bool
 IsH264CodecString(const nsAString& aCodec)
 {
@@ -477,15 +480,14 @@ IsVP9CodecString(const nsAString& aCodec)
          aCodec.EqualsLiteral("vp9.0");
 }
 
-template <int N>
-static bool
-StartsWith(const nsACString& string, const char (&prefix)[N])
+#ifdef MOZ_AV1
+bool
+IsAV1CodecString(const nsAString& aCodec)
 {
-    if (N - 1 > string.Length()) {
-      return false;
-    }
-    return memcmp(string.Data(), prefix, N - 1) == 0;
+  return aCodec.EqualsLiteral("av1") ||
+    StartsWith(NS_ConvertUTF16toUTF8(aCodec), "av01");
 }
+#endif
 
 UniquePtr<TrackInfo>
 CreateTrackInfoWithMIMEType(const nsACString& aCodecMIMEType)
diff --git a/dom/media/VideoUtils.h b/dom/media/VideoUtils.h
index 441b63792..aaf0e9903 100644
--- a/dom/media/VideoUtils.h
+++ b/dom/media/VideoUtils.h
@@ -345,6 +345,11 @@ IsVP8CodecString(const nsAString& aCodec);
 bool
 IsVP9CodecString(const nsAString& aCodec);
 
+#ifdef MOZ_AV1
+bool
+IsAV1CodecString(const nsAString& aCodec);
+#endif
+
 // Try and create a TrackInfo with a given codec MIME type.
 UniquePtr<TrackInfo>
 CreateTrackInfoWithMIMEType(const nsACString& aCodecMIMEType);
diff --git a/dom/media/WebVTTListener.h b/dom/media/WebVTTListener.h
index 67271664a..461d7f00d 100644
--- a/dom/media/WebVTTListener.h
+++ b/dom/media/WebVTTListener.h
@@ -10,6 +10,7 @@
 #include "nsIStreamListener.h"
 #include "nsIChannelEventSink.h"
 #include "nsIInterfaceRequestor.h"
+#include "nsCOMPtr.h"
 #include "nsCycleCollectionParticipant.h"
 
 class nsIWebVTTParserWrapper;
diff --git a/dom/media/android/AndroidMediaDecoder.cpp b/dom/media/android/AndroidMediaDecoder.cpp
deleted file mode 100644
index 41ef3fcb0..000000000
--- a/dom/media/android/AndroidMediaDecoder.cpp
+++ /dev/null
@@ -1,25 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "MediaDecoderStateMachine.h"
-#include "AndroidMediaDecoder.h"
-#include "AndroidMediaReader.h"
-
-namespace mozilla {
-
-AndroidMediaDecoder::AndroidMediaDecoder(MediaDecoderOwner* aOwner,
-                                         const nsACString& aType)
-  : MediaDecoder(aOwner), mType(aType)
-{
-}
-
-MediaDecoderStateMachine* AndroidMediaDecoder::CreateStateMachine()
-{
-  return new MediaDecoderStateMachine(this, new AndroidMediaReader(this, mType));
-}
-
-} // namespace mozilla
-
diff --git a/dom/media/android/AndroidMediaDecoder.h b/dom/media/android/AndroidMediaDecoder.h
deleted file mode 100644
index 88b5a243f..000000000
--- a/dom/media/android/AndroidMediaDecoder.h
+++ /dev/null
@@ -1,28 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-#if !defined(AndroidMediaDecoder_h_)
-#define AndroidMediaDecoder_h_
-
-#include "MediaDecoder.h"
-#include "AndroidMediaDecoder.h"
-
-namespace mozilla {
-
-class AndroidMediaDecoder : public MediaDecoder
-{
-  nsCString mType;
-public:
-  AndroidMediaDecoder(MediaDecoderOwner* aOwner, const nsACString& aType);
-
-  MediaDecoder* Clone(MediaDecoderOwner* aOwner) override {
-    return new AndroidMediaDecoder(aOwner, mType);
-  }
-  MediaDecoderStateMachine* CreateStateMachine() override;
-};
-
-} // namespace mozilla
-
-#endif
diff --git a/dom/media/android/AndroidMediaPluginHost.cpp b/dom/media/android/AndroidMediaPluginHost.cpp
deleted file mode 100644
index d4c4fc59e..000000000
--- a/dom/media/android/AndroidMediaPluginHost.cpp
+++ /dev/null
@@ -1,305 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-#include "mozilla/Preferences.h"
-#include "MediaResource.h"
-#include "mozilla/dom/HTMLMediaElement.h"
-#include "mozilla/Services.h"
-#include "AndroidMediaPluginHost.h"
-#include "nsAutoPtr.h"
-#include "nsXPCOMStrings.h"
-#include "nsISeekableStream.h"
-#include "nsIGfxInfo.h"
-#include "prmem.h"
-#include "prlink.h"
-#include "AndroidMediaResourceServer.h"
-#include "nsServiceManagerUtils.h"
-
-#include "MPAPI.h"
-
-#include "nsIPropertyBag2.h"
-
-#if defined(ANDROID)
-#include "android/log.h"
-#define ALOG(args...)  __android_log_print(ANDROID_LOG_INFO, "AndroidMediaPluginHost" , ## args)
-#else
-#define ALOG(args...) /* do nothing */
-#endif
-
-using namespace MPAPI;
-
-Decoder::Decoder() :
-  mResource(nullptr), mPrivate(nullptr)
-{
-}
-
-namespace mozilla {
-
-static char* GetResource(Decoder *aDecoder)
-{
-  return static_cast<char*>(aDecoder->mResource);
-}
-
-class GetIntPrefEvent : public Runnable {
-public:
-  GetIntPrefEvent(const char* aPref, int32_t* aResult)
-    : mPref(aPref), mResult(aResult) {}
-  NS_IMETHOD Run() override {
-    return Preferences::GetInt(mPref, mResult);
-  }
-private:
-  const char* mPref;
-  int32_t*    mResult;
-};
-
-static bool GetIntPref(const char* aPref, int32_t* aResult)
-{
-  // GetIntPref() is called on the decoder thread, but the Preferences API
-  // can only be called on the main thread. Post a runnable and wait.
-  NS_ENSURE_TRUE(aPref, false);
-  NS_ENSURE_TRUE(aResult, false);
-  nsCOMPtr<nsIRunnable> event = new GetIntPrefEvent(aPref, aResult);
-  return NS_SUCCEEDED(NS_DispatchToMainThread(event, NS_DISPATCH_SYNC));
-}
-
-static bool
-GetSystemInfoString(const char *aKey, char *aResult, size_t aResultLength)
-{
-  NS_ENSURE_TRUE(aKey, false);
-  NS_ENSURE_TRUE(aResult, false);
-
-  nsCOMPtr<nsIPropertyBag2> infoService = do_GetService("@mozilla.org/system-info;1");
-  NS_ASSERTION(infoService, "Could not find a system info service");
-
-  nsAutoCString key(aKey);
-  nsAutoCString info;
-  nsresult rv = infoService->GetPropertyAsACString(NS_ConvertUTF8toUTF16(key),
-                                                  info);
-
-  NS_ENSURE_SUCCESS(rv, false);
-
-  strncpy(aResult, info.get(), aResultLength);
-
-  return true;
-}
-
-static PluginHost sPluginHost = {
-  nullptr,
-  nullptr,
-  nullptr,
-  nullptr,
-  GetIntPref,
-  GetSystemInfoString
-};
-
-// Return true if Omx decoding is supported on the device. This checks the
-// built in whitelist/blacklist and preferences to see if that is overridden.
-static bool IsOmxSupported()
-{
-  bool forceEnabled =
-      Preferences::GetBool("stagefright.force-enabled", false);
-  bool disabled =
-      Preferences::GetBool("stagefright.disabled", false);
-
-  if (disabled) {
-    NS_WARNING("XXX stagefright disabled\n");
-    return false;
-  }
-
-  if (!forceEnabled) {
-    nsCOMPtr<nsIGfxInfo> gfxInfo = services::GetGfxInfo();
-    if (gfxInfo) {
-      int32_t status;
-      nsCString discardFailure;
-      if (NS_SUCCEEDED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_STAGEFRIGHT, discardFailure, &status))) {
-        if (status != nsIGfxInfo::FEATURE_STATUS_OK) {
-          NS_WARNING("XXX stagefright blacklisted\n");
-          return false;
-        }
-      }
-    }
-  }
-
-  return true;
-}
-
-// Return the name of the shared library that implements Omx based decoding. This varies
-// depending on libstagefright version installed on the device and whether it is B2G vs Android.
-// nullptr is returned if Omx decoding is not supported on the device,
-static const char* GetOmxLibraryName()
-{
-#if defined(ANDROID)
-  nsCOMPtr<nsIPropertyBag2> infoService = do_GetService("@mozilla.org/system-info;1");
-  NS_ASSERTION(infoService, "Could not find a system info service");
-
-  int32_t version;
-  nsresult rv = infoService->GetPropertyAsInt32(NS_LITERAL_STRING("version"), &version);
-  if (NS_SUCCEEDED(rv)) {
-    ALOG("Android Version is: %d", version);
-  }
-
-  nsAutoString release_version;
-  rv = infoService->GetPropertyAsAString(NS_LITERAL_STRING("release_version"), release_version);
-  if (NS_SUCCEEDED(rv)) {
-    ALOG("Android Release Version is: %s", NS_LossyConvertUTF16toASCII(release_version).get());
-  }
-
-  nsAutoString device;
-  rv = infoService->GetPropertyAsAString(NS_LITERAL_STRING("device"), device);
-  if (NS_SUCCEEDED(rv)) {
-    ALOG("Android Device is: %s", NS_LossyConvertUTF16toASCII(device).get());
-  }
-
-  nsAutoString manufacturer;
-  rv = infoService->GetPropertyAsAString(NS_LITERAL_STRING("manufacturer"), manufacturer);
-  if (NS_SUCCEEDED(rv)) {
-    ALOG("Android Manufacturer is: %s", NS_LossyConvertUTF16toASCII(manufacturer).get());
-  }
-
-  nsAutoString hardware;
-  rv = infoService->GetPropertyAsAString(NS_LITERAL_STRING("hardware"), hardware);
-  if (NS_SUCCEEDED(rv)) {
-    ALOG("Android Hardware is: %s", NS_LossyConvertUTF16toASCII(hardware).get());
-  }
-#endif
-
-  if (!IsOmxSupported())
-    return nullptr;
-
-#if defined(ANDROID)
-  if (version >= 17) {
-    return "libomxpluginkk.so";
-  }
-
-  // Ice Cream Sandwich and Jellybean
-  return "libomxplugin.so";
-
-#else
-  return nullptr;
-#endif
-}
-
-AndroidMediaPluginHost::AndroidMediaPluginHost() {
-  MOZ_COUNT_CTOR(AndroidMediaPluginHost);
-  MOZ_ASSERT(NS_IsMainThread());
-
-  mResourceServer = AndroidMediaResourceServer::Start();
-
-  const char* name = GetOmxLibraryName();
-  ALOG("Loading OMX Plugin: %s", name ? name : "nullptr");
-  if (name) {
-    char *path = PR_GetLibraryFilePathname("libxul.so", (PRFuncPtr) GetOmxLibraryName);
-    PRLibrary *lib = nullptr;
-    if (path) {
-      nsAutoCString libpath(path);
-      PR_Free(path);
-      int32_t slash = libpath.RFindChar('/');
-      if (slash != kNotFound) {
-        libpath.Truncate(slash + 1);
-        libpath.Append(name);
-        lib = PR_LoadLibrary(libpath.get());
-      }
-    }
-    if (!lib)
-      lib = PR_LoadLibrary(name);
-
-    if (lib) {
-      Manifest *manifest = static_cast<Manifest *>(PR_FindSymbol(lib, "MPAPI_MANIFEST"));
-      if (manifest) {
-        mPlugins.AppendElement(manifest);
-        ALOG("OMX plugin successfully loaded");
-     }
-    }
-  }
-}
-
-AndroidMediaPluginHost::~AndroidMediaPluginHost() {
-  mResourceServer->Stop();
-  MOZ_COUNT_DTOR(AndroidMediaPluginHost);
-}
-
-bool AndroidMediaPluginHost::FindDecoder(const nsACString& aMimeType, const char* const** aCodecs)
-{
-  const char *chars;
-  size_t len = NS_CStringGetData(aMimeType, &chars, nullptr);
-  for (size_t n = 0; n < mPlugins.Length(); ++n) {
-    Manifest *plugin = mPlugins[n];
-    const char* const *codecs;
-    if (plugin->CanDecode(chars, len, &codecs)) {
-      if (aCodecs)
-        *aCodecs = codecs;
-      return true;
-    }
-  }
-  return false;
-}
-
-MPAPI::Decoder *AndroidMediaPluginHost::CreateDecoder(MediaResource *aResource, const nsACString& aMimeType)
-{
-  NS_ENSURE_TRUE(aResource, nullptr);
-
-  nsAutoPtr<Decoder> decoder(new Decoder());
-  if (!decoder) {
-    return nullptr;
-  }
-
-  const char *chars;
-  size_t len = NS_CStringGetData(aMimeType, &chars, nullptr);
-  for (size_t n = 0; n < mPlugins.Length(); ++n) {
-    Manifest *plugin = mPlugins[n];
-    const char* const *codecs;
-    if (!plugin->CanDecode(chars, len, &codecs)) {
-      continue;
-    }
-
-    nsCString url;
-    nsresult rv = mResourceServer->AddResource(aResource, url);
-    if (NS_FAILED (rv)) continue;
-
-    decoder->mResource = strdup(url.get());
-    if (plugin->CreateDecoder(&sPluginHost, decoder, chars, len)) {
-      return decoder.forget();
-    }
-  }
-
-  return nullptr;
-}
-
-void AndroidMediaPluginHost::DestroyDecoder(Decoder *aDecoder)
-{
-  aDecoder->DestroyDecoder(aDecoder);
-  char* resource = GetResource(aDecoder);
-  if (resource) {
-    // resource *shouldn't* be null, but check anyway just in case the plugin
-    // decoder does something stupid.
-    mResourceServer->RemoveResource(nsCString(resource));
-    free(resource);
-  }
-  delete aDecoder;
-}
-
-AndroidMediaPluginHost *sAndroidMediaPluginHost = nullptr;
-AndroidMediaPluginHost *EnsureAndroidMediaPluginHost()
-{
-  MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
-  if (!sAndroidMediaPluginHost) {
-    sAndroidMediaPluginHost = new AndroidMediaPluginHost();
-  }
-  return sAndroidMediaPluginHost;
-}
-
-AndroidMediaPluginHost *GetAndroidMediaPluginHost()
-{
-  MOZ_ASSERT(sAndroidMediaPluginHost);
-  return sAndroidMediaPluginHost;
-}
-
-void AndroidMediaPluginHost::Shutdown()
-{
-  delete sAndroidMediaPluginHost;
-  sAndroidMediaPluginHost = nullptr;
-}
-
-} // namespace mozilla
diff --git a/dom/media/android/AndroidMediaPluginHost.h b/dom/media/android/AndroidMediaPluginHost.h
deleted file mode 100644
index 854b7f21e..000000000
--- a/dom/media/android/AndroidMediaPluginHost.h
+++ /dev/null
@@ -1,41 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-#if !defined(AndroidMediaPluginHost_h_)
-#define AndroidMediaPluginHost_h_
-
-#include "nsTArray.h"
-#include "MediaResource.h"
-#include "MPAPI.h"
-#include "AndroidMediaResourceServer.h"
-
-namespace mozilla {
-
-class AndroidMediaPluginHost {
-  RefPtr<AndroidMediaResourceServer> mResourceServer;
-  nsTArray<MPAPI::Manifest *> mPlugins;
-
-  MPAPI::Manifest *FindPlugin(const nsACString& aMimeType);
-public:
-  AndroidMediaPluginHost();
-  ~AndroidMediaPluginHost();
-
-  static void Shutdown();
-
-  bool FindDecoder(const nsACString& aMimeType, const char* const** aCodecs);
-  MPAPI::Decoder *CreateDecoder(mozilla::MediaResource *aResource, const nsACString& aMimeType);
-  void DestroyDecoder(MPAPI::Decoder *aDecoder);
-};
-
-// Must be called on the main thread. Creates the plugin host if it doesn't
-// already exist.
-AndroidMediaPluginHost *EnsureAndroidMediaPluginHost();
-
-// May be called on any thread after EnsureAndroidMediaPluginHost has been called.
-AndroidMediaPluginHost *GetAndroidMediaPluginHost();
-
-} // namespace mozilla
-
-#endif
diff --git a/dom/media/android/AndroidMediaReader.cpp b/dom/media/android/AndroidMediaReader.cpp
deleted file mode 100644
index 12afacbc9..000000000
--- a/dom/media/android/AndroidMediaReader.cpp
+++ /dev/null
@@ -1,449 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-#include "AndroidMediaReader.h"
-#include "mozilla/TimeStamp.h"
-#include "mozilla/gfx/Point.h"
-#include "MediaResource.h"
-#include "VideoUtils.h"
-#include "AndroidMediaDecoder.h"
-#include "AndroidMediaPluginHost.h"
-#include "MediaDecoderStateMachine.h"
-#include "ImageContainer.h"
-#include "AbstractMediaDecoder.h"
-#include "gfx2DGlue.h"
-#include "VideoFrameContainer.h"
-#include "mozilla/CheckedInt.h"
-
-namespace mozilla {
-
-using namespace mozilla::gfx;
-using namespace mozilla::media;
-
-typedef mozilla::layers::Image Image;
-typedef mozilla::layers::PlanarYCbCrImage PlanarYCbCrImage;
-
-AndroidMediaReader::AndroidMediaReader(AbstractMediaDecoder *aDecoder,
-                                       const nsACString& aContentType) :
-  MediaDecoderReader(aDecoder),
-  mType(aContentType),
-  mPlugin(nullptr),
-  mHasAudio(false),
-  mHasVideo(false),
-  mVideoSeekTimeUs(-1),
-  mAudioSeekTimeUs(-1)
-{
-}
-
-nsresult AndroidMediaReader::ReadMetadata(MediaInfo* aInfo,
-                                          MetadataTags** aTags)
-{
-  MOZ_ASSERT(OnTaskQueue());
-
-  if (!mPlugin) {
-    mPlugin = GetAndroidMediaPluginHost()->CreateDecoder(mDecoder->GetResource(), mType);
-    if (!mPlugin) {
-      return NS_ERROR_FAILURE;
-    }
-  }
-
-  // Set the total duration (the max of the audio and video track).
-  int64_t durationUs;
-  mPlugin->GetDuration(mPlugin, &durationUs);
-  if (durationUs) {
-    mInfo.mMetadataDuration.emplace(TimeUnit::FromMicroseconds(durationUs));
-  }
-
-  if (mPlugin->HasVideo(mPlugin)) {
-    int32_t width, height;
-    mPlugin->GetVideoParameters(mPlugin, &width, &height);
-    nsIntRect pictureRect(0, 0, width, height);
-
-    // Validate the container-reported frame and pictureRect sizes. This ensures
-    // that our video frame creation code doesn't overflow.
-    nsIntSize displaySize(width, height);
-    nsIntSize frameSize(width, height);
-    if (!IsValidVideoRegion(frameSize, pictureRect, displaySize)) {
-      return NS_ERROR_FAILURE;
-    }
-
-    // Video track's frame sizes will not overflow. Activate the video track.
-    mHasVideo = true;
-    mInfo.mVideo.mDisplay = displaySize;
-    mPicture = pictureRect;
-    mInitialFrame = frameSize;
-    VideoFrameContainer* container = mDecoder->GetVideoFrameContainer();
-    if (container) {
-      container->ClearCurrentFrame(IntSize(displaySize.width, displaySize.height));
-    }
-  }
-
-  if (mPlugin->HasAudio(mPlugin)) {
-    int32_t numChannels, sampleRate;
-    mPlugin->GetAudioParameters(mPlugin, &numChannels, &sampleRate);
-    mHasAudio = true;
-    mInfo.mAudio.mChannels = numChannels;
-    mInfo.mAudio.mRate = sampleRate;
-  }
-
- *aInfo = mInfo;
- *aTags = nullptr;
-  return NS_OK;
-}
-
-RefPtr<ShutdownPromise>
-AndroidMediaReader::Shutdown()
-{
-  ResetDecode();
-  if (mPlugin) {
-    GetAndroidMediaPluginHost()->DestroyDecoder(mPlugin);
-    mPlugin = nullptr;
-  }
-
-  return MediaDecoderReader::Shutdown();
-}
-
-// Resets all state related to decoding, emptying all buffers etc.
-nsresult AndroidMediaReader::ResetDecode(TrackSet aTracks)
-{
-  if (mLastVideoFrame) {
-    mLastVideoFrame = nullptr;
-  }
-  mSeekRequest.DisconnectIfExists();
-  mSeekPromise.RejectIfExists(NS_OK, __func__);
-  return MediaDecoderReader::ResetDecode(aTracks);
-}
-
-bool AndroidMediaReader::DecodeVideoFrame(bool &aKeyframeSkip,
-                                          int64_t aTimeThreshold)
-{
-  // Record number of frames decoded and parsed. Automatically update the
-  // stats counters using the AutoNotifyDecoded stack-based class.
-  AbstractMediaDecoder::AutoNotifyDecoded a(mDecoder);
-
-  // Throw away the currently buffered frame if we are seeking.
-  if (mLastVideoFrame && mVideoSeekTimeUs != -1) {
-    mLastVideoFrame = nullptr;
-  }
-
-  ImageBufferCallback bufferCallback(mDecoder->GetImageContainer());
-  RefPtr<Image> currentImage;
-
-  // Read next frame
-  while (true) {
-    MPAPI::VideoFrame frame;
-    if (!mPlugin->ReadVideo(mPlugin, &frame, mVideoSeekTimeUs, &bufferCallback)) {
-      // We reached the end of the video stream. If we have a buffered
-      // video frame, push it the video queue using the total duration
-      // of the video as the end time.
-      if (mLastVideoFrame) {
-        int64_t durationUs;
-        mPlugin->GetDuration(mPlugin, &durationUs);
-        durationUs = std::max<int64_t>(durationUs - mLastVideoFrame->mTime, 0);
-        RefPtr<VideoData> data = VideoData::ShallowCopyUpdateDuration(mLastVideoFrame,
-                                                                        durationUs);
-        mVideoQueue.Push(data);
-        mLastVideoFrame = nullptr;
-      }
-      return false;
-    }
-    mVideoSeekTimeUs = -1;
-
-    if (aKeyframeSkip) {
-      // Disable keyframe skipping for now as
-      // stagefright doesn't seem to be telling us
-      // when a frame is a keyframe.
-#if 0
-      if (!frame.mKeyFrame) {
-        ++a.mStats.mParsedFrames;
-        ++a.mStats.mDroppedFrames;
-        continue;
-      }
-#endif
-      aKeyframeSkip = false;
-    }
-
-    if (frame.mSize == 0)
-      return true;
-
-    currentImage = bufferCallback.GetImage();
-    int64_t pos = mDecoder->GetResource()->Tell();
-    IntRect picture = mPicture;
-
-    RefPtr<VideoData> v;
-    if (currentImage) {
-      gfx::IntSize frameSize = currentImage->GetSize();
-      if (frameSize.width != mInitialFrame.width ||
-          frameSize.height != mInitialFrame.height) {
-        // Frame size is different from what the container reports. This is legal,
-        // and we will preserve the ratio of the crop rectangle as it
-        // was reported relative to the picture size reported by the container.
-        picture.x = (mPicture.x * frameSize.width) / mInitialFrame.width;
-        picture.y = (mPicture.y * frameSize.height) / mInitialFrame.height;
-        picture.width = (frameSize.width * mPicture.width) / mInitialFrame.width;
-        picture.height = (frameSize.height * mPicture.height) / mInitialFrame.height;
-      }
-
-      v = VideoData::CreateFromImage(mInfo.mVideo,
-                                     pos,
-                                     frame.mTimeUs,
-                                     1, // We don't know the duration yet.
-                                     currentImage,
-                                     frame.mKeyFrame,
-                                     -1,
-                                     picture);
-    } else {
-      // Assume YUV
-      VideoData::YCbCrBuffer b;
-      b.mPlanes[0].mData = static_cast<uint8_t *>(frame.Y.mData);
-      b.mPlanes[0].mStride = frame.Y.mStride;
-      b.mPlanes[0].mHeight = frame.Y.mHeight;
-      b.mPlanes[0].mWidth = frame.Y.mWidth;
-      b.mPlanes[0].mOffset = frame.Y.mOffset;
-      b.mPlanes[0].mSkip = frame.Y.mSkip;
-
-      b.mPlanes[1].mData = static_cast<uint8_t *>(frame.Cb.mData);
-      b.mPlanes[1].mStride = frame.Cb.mStride;
-      b.mPlanes[1].mHeight = frame.Cb.mHeight;
-      b.mPlanes[1].mWidth = frame.Cb.mWidth;
-      b.mPlanes[1].mOffset = frame.Cb.mOffset;
-      b.mPlanes[1].mSkip = frame.Cb.mSkip;
-
-      b.mPlanes[2].mData = static_cast<uint8_t *>(frame.Cr.mData);
-      b.mPlanes[2].mStride = frame.Cr.mStride;
-      b.mPlanes[2].mHeight = frame.Cr.mHeight;
-      b.mPlanes[2].mWidth = frame.Cr.mWidth;
-      b.mPlanes[2].mOffset = frame.Cr.mOffset;
-      b.mPlanes[2].mSkip = frame.Cr.mSkip;
-
-      if (frame.Y.mWidth != mInitialFrame.width ||
-          frame.Y.mHeight != mInitialFrame.height) {
-
-        // Frame size is different from what the container reports. This is legal,
-        // and we will preserve the ratio of the crop rectangle as it
-        // was reported relative to the picture size reported by the container.
-        picture.x = (mPicture.x * frame.Y.mWidth) / mInitialFrame.width;
-        picture.y = (mPicture.y * frame.Y.mHeight) / mInitialFrame.height;
-        picture.width = (frame.Y.mWidth * mPicture.width) / mInitialFrame.width;
-        picture.height = (frame.Y.mHeight * mPicture.height) / mInitialFrame.height;
-      }
-
-      // This is the approximate byte position in the stream.
-      v = VideoData::CreateAndCopyData(mInfo.mVideo,
-                                       mDecoder->GetImageContainer(),
-                                       pos,
-                                       frame.mTimeUs,
-                                       1, // We don't know the duration yet.
-                                       b,
-                                       frame.mKeyFrame,
-                                       -1,
-                                       picture);
-    }
-
-    if (!v) {
-      return false;
-    }
-    a.mStats.mParsedFrames++;
-    a.mStats.mDecodedFrames++;
-    NS_ASSERTION(a.mStats.mDecodedFrames <= a.mStats.mParsedFrames, "Expect to decode fewer frames than parsed in AndroidMedia...");
-
-    // Since MPAPI doesn't give us the end time of frames, we keep one frame
-    // buffered in AndroidMediaReader and push it into the queue as soon
-    // we read the following frame so we can use that frame's start time as
-    // the end time of the buffered frame.
-    if (!mLastVideoFrame) {
-      mLastVideoFrame = v;
-      continue;
-    }
-
-    // Calculate the duration as the timestamp of the current frame minus the
-    // timestamp of the previous frame. We can then return the previously
-    // decoded frame, and it will have a valid timestamp.
-    int64_t duration = v->mTime - mLastVideoFrame->mTime;
-    mLastVideoFrame = VideoData::ShallowCopyUpdateDuration(mLastVideoFrame, duration);
-
-    // We have the start time of the next frame, so we can push the previous
-    // frame into the queue, except if the end time is below the threshold,
-    // in which case it wouldn't be displayed anyway.
-    if (mLastVideoFrame->GetEndTime() < aTimeThreshold) {
-      mLastVideoFrame = nullptr;
-      continue;
-    }
-
-    // Buffer the current frame we just decoded.
-    mVideoQueue.Push(mLastVideoFrame);
-    mLastVideoFrame = v;
-
-    break;
-  }
-
-  return true;
-}
-
-bool AndroidMediaReader::DecodeAudioData()
-{
-  MOZ_ASSERT(OnTaskQueue());
-
-  // This is the approximate byte position in the stream.
-  int64_t pos = mDecoder->GetResource()->Tell();
-
-  // Read next frame
-  MPAPI::AudioFrame source;
-  if (!mPlugin->ReadAudio(mPlugin, &source, mAudioSeekTimeUs)) {
-    return false;
-  }
-  mAudioSeekTimeUs = -1;
-
-  // Ignore empty buffers which stagefright media read will sporadically return
-  if (source.mSize == 0)
-    return true;
-
-  uint32_t frames = source.mSize / (source.mAudioChannels *
-                                    sizeof(AudioDataValue));
-
-  typedef AudioCompactor::NativeCopy MPCopy;
-  return mAudioCompactor.Push(pos,
-                              source.mTimeUs,
-                              source.mAudioSampleRate,
-                              frames,
-                              source.mAudioChannels,
-                              MPCopy(static_cast<uint8_t *>(source.mData),
-                                     source.mSize,
-                                     source.mAudioChannels));
-}
-
-RefPtr<MediaDecoderReader::SeekPromise>
-AndroidMediaReader::Seek(SeekTarget aTarget, int64_t aEndTime)
-{
-  MOZ_ASSERT(OnTaskQueue());
-
-  RefPtr<SeekPromise> p = mSeekPromise.Ensure(__func__);
-  if (mHasAudio && mHasVideo) {
-    // The decoder seeks/demuxes audio and video streams separately. So if
-    // we seek both audio and video to aTarget, the audio stream can typically
-    // seek closer to the seek target, since typically every audio block is
-    // a sync point, whereas for video there are only keyframes once every few
-    // seconds. So if we have both audio and video, we must seek the video
-    // stream to the preceeding keyframe first, get the stream time, and then
-    // seek the audio stream to match the video stream's time. Otherwise, the
-    // audio and video streams won't be in sync after the seek.
-    mVideoSeekTimeUs = aTarget.GetTime().ToMicroseconds();
-
-    RefPtr<AndroidMediaReader> self = this;
-    mSeekRequest.Begin(DecodeToFirstVideoData()->Then(OwnerThread(), __func__, [self] (MediaData* v) {
-      self->mSeekRequest.Complete();
-      self->mAudioSeekTimeUs = v->mTime;
-      self->mSeekPromise.Resolve(media::TimeUnit::FromMicroseconds(self->mAudioSeekTimeUs), __func__);
-    }, [self, aTarget] () {
-      self->mSeekRequest.Complete();
-      self->mAudioSeekTimeUs = aTarget.GetTime().ToMicroseconds();
-      self->mSeekPromise.Resolve(aTarget.GetTime(), __func__);
-    }));
-  } else {
-    mAudioSeekTimeUs = mVideoSeekTimeUs = aTarget.GetTime().ToMicroseconds();
-    mSeekPromise.Resolve(aTarget.GetTime(), __func__);
-  }
-
-  return p;
-}
-
-AndroidMediaReader::ImageBufferCallback::ImageBufferCallback(mozilla::layers::ImageContainer *aImageContainer) :
-  mImageContainer(aImageContainer)
-{
-}
-
-void *
-AndroidMediaReader::ImageBufferCallback::operator()(size_t aWidth, size_t aHeight,
-                                                    MPAPI::ColorFormat aColorFormat)
-{
-  if (!mImageContainer) {
-    NS_WARNING("No image container to construct an image");
-    return nullptr;
-  }
-
-  RefPtr<Image> image;
-  switch(aColorFormat) {
-    case MPAPI::RGB565:
-      image = mozilla::layers::CreateSharedRGBImage(mImageContainer,
-                                                    nsIntSize(aWidth, aHeight),
-                                                    SurfaceFormat::R5G6B5_UINT16);
-      if (!image) {
-        NS_WARNING("Could not create rgb image");
-        return nullptr;
-      }
-
-      mImage = image;
-      return image->GetBuffer();
-    case MPAPI::I420:
-      return CreateI420Image(aWidth, aHeight);
-    default:
-      NS_NOTREACHED("Color format not supported");
-      return nullptr;
-  }
-}
-
-uint8_t *
-AndroidMediaReader::ImageBufferCallback::CreateI420Image(size_t aWidth,
-                                                         size_t aHeight)
-{
-  RefPtr<PlanarYCbCrImage> yuvImage = mImageContainer->CreatePlanarYCbCrImage();
-  mImage = yuvImage;
-
-  if (!yuvImage) {
-    NS_WARNING("Could not create I420 image");
-    return nullptr;
-  }
-
-  // Use uint32_t throughout to match AllocateAndGetNewBuffer's param
-  const auto checkedFrameSize =
-    CheckedInt<uint32_t>(aWidth) * aHeight;
-
-  // Allocate enough for one full resolution Y plane
-  // and two quarter resolution Cb/Cr planes.
-  const auto checkedBufferSize =
-    checkedFrameSize + checkedFrameSize / 2;
-
-  if (!checkedBufferSize.isValid()) { // checks checkedFrameSize too
-    NS_WARNING("Could not create I420 image");
-    return nullptr;
-  }
-
-  const auto frameSize = checkedFrameSize.value();
-
-  uint8_t *buffer =
-    yuvImage->AllocateAndGetNewBuffer(checkedBufferSize.value());
-
-  mozilla::layers::PlanarYCbCrData frameDesc;
-
-  frameDesc.mYChannel = buffer;
-  frameDesc.mCbChannel = buffer + frameSize;
-  frameDesc.mCrChannel = frameDesc.mCbChannel + frameSize / 4;
-
-  frameDesc.mYSize = IntSize(aWidth, aHeight);
-  frameDesc.mCbCrSize = IntSize(aWidth / 2, aHeight / 2);
-
-  frameDesc.mYStride = aWidth;
-  frameDesc.mCbCrStride = aWidth / 2;
-
-  frameDesc.mYSkip = 0;
-  frameDesc.mCbSkip = 0;
-  frameDesc.mCrSkip = 0;
-
-  frameDesc.mPicX = 0;
-  frameDesc.mPicY = 0;
-  frameDesc.mPicSize = IntSize(aWidth, aHeight);
-
-  yuvImage->AdoptData(frameDesc);
-
-  return buffer;
-}
-
-already_AddRefed<Image>
-AndroidMediaReader::ImageBufferCallback::GetImage()
-{
-  return mImage.forget();
-}
-
-} // namespace mozilla
diff --git a/dom/media/android/AndroidMediaReader.h b/dom/media/android/AndroidMediaReader.h
deleted file mode 100644
index def85a343..000000000
--- a/dom/media/android/AndroidMediaReader.h
+++ /dev/null
@@ -1,75 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-#if !defined(AndroidMediaReader_h_)
-#define AndroidMediaReader_h_
-
-#include "mozilla/Attributes.h"
-#include "MediaResource.h"
-#include "MediaDecoderReader.h"
-#include "ImageContainer.h"
-#include "mozilla/layers/SharedRGBImage.h"
-
-#include "MPAPI.h"
-
-class nsACString;
-
-namespace mozilla {
-
-class AbstractMediaDecoder;
-
-namespace layers {
-class ImageContainer;
-}
-
-class AndroidMediaReader : public MediaDecoderReader
-{
-  nsCString mType;
-  MPAPI::Decoder *mPlugin;
-  bool mHasAudio;
-  bool mHasVideo;
-  nsIntRect mPicture;
-  nsIntSize mInitialFrame;
-  int64_t mVideoSeekTimeUs;
-  int64_t mAudioSeekTimeUs;
-  RefPtr<VideoData> mLastVideoFrame;
-  MozPromiseHolder<MediaDecoderReader::SeekPromise> mSeekPromise;
-  MozPromiseRequestHolder<MediaDecoderReader::MediaDataPromise> mSeekRequest;
-public:
-  AndroidMediaReader(AbstractMediaDecoder* aDecoder,
-                     const nsACString& aContentType);
-
-  nsresult ResetDecode(TrackSet aTracks = TrackSet(TrackInfo::kAudioTrack,
-                                                   TrackInfo::kVideoTrack)) override;
-
-  bool DecodeAudioData() override;
-  bool DecodeVideoFrame(bool &aKeyframeSkip, int64_t aTimeThreshold) override;
-
-  nsresult ReadMetadata(MediaInfo* aInfo, MetadataTags** aTags) override;
-  RefPtr<SeekPromise> Seek(SeekTarget aTarget, int64_t aEndTime) override;
-
-  RefPtr<ShutdownPromise> Shutdown() override;
-
-  class ImageBufferCallback : public MPAPI::BufferCallback {
-    typedef mozilla::layers::Image Image;
-
-  public:
-    ImageBufferCallback(mozilla::layers::ImageContainer *aImageContainer);
-    void *operator()(size_t aWidth, size_t aHeight,
-                     MPAPI::ColorFormat aColorFormat) override;
-    already_AddRefed<Image> GetImage();
-
-  private:
-    uint8_t *CreateI420Image(size_t aWidth, size_t aHeight);
-
-    mozilla::layers::ImageContainer *mImageContainer;
-    RefPtr<Image> mImage;
-  };
-
-};
-
-} // namespace mozilla
-
-#endif
diff --git a/dom/media/android/AndroidMediaResourceServer.cpp b/dom/media/android/AndroidMediaResourceServer.cpp
deleted file mode 100644
index bd76a8c68..000000000
--- a/dom/media/android/AndroidMediaResourceServer.cpp
+++ /dev/null
@@ -1,503 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-#include "mozilla/Assertions.h"
-#include "mozilla/Base64.h"
-#include "mozilla/IntegerPrintfMacros.h"
-#include "mozilla/UniquePtr.h"
-#include "nsThreadUtils.h"
-#include "nsIServiceManager.h"
-#include "nsISocketTransport.h"
-#include "nsIOutputStream.h"
-#include "nsIInputStream.h"
-#include "nsIRandomGenerator.h"
-#include "nsReadLine.h"
-#include "nsNetCID.h"
-#include "VideoUtils.h"
-#include "MediaResource.h"
-#include "AndroidMediaResourceServer.h"
-
-#if defined(_MSC_VER)
-#define strtoll _strtoi64
-#endif
-
-using namespace mozilla;
-
-/*
-  ReadCRLF is a variant of NS_ReadLine from nsReadLine.h that deals
-  with the carriage return/line feed requirements of HTTP requests.
-*/
-template<typename CharT, class StreamType, class StringType>
-nsresult
-ReadCRLF (StreamType* aStream, nsLineBuffer<CharT> * aBuffer,
-          StringType & aLine, bool *aMore)
-{
-  // eollast is true if the last character in the buffer is a '\r',
-  // signaling a potential '\r\n' sequence split between reads.
-  bool eollast = false;
-
-  aLine.Truncate();
-
-  while (1) { // will be returning out of this loop on eol or eof
-    if (aBuffer->start == aBuffer->end) { // buffer is empty.  Read into it.
-      uint32_t bytesRead;
-      nsresult rv = aStream->Read(aBuffer->buf, kLineBufferSize, &bytesRead);
-      if (NS_FAILED(rv) || bytesRead == 0) {
-        *aMore = false;
-        return rv;
-      }
-      aBuffer->start = aBuffer->buf;
-      aBuffer->end = aBuffer->buf + bytesRead;
-      *(aBuffer->end) = '\0';
-    }
-
-    /*
-     * Walk the buffer looking for an end-of-line.
-     * There are 4 cases to consider:
-     *  1. the CR char is the last char in the buffer
-     *  2. the CRLF sequence are the last characters in the buffer
-     *  3. the CRLF sequence + one or more chars at the end of the buffer
-     *      we need at least one char after the first CRLF sequence to
-     *      set |aMore| correctly.
-     *  4. The LF character is the first char in the buffer when eollast is
-     *      true.
-     */
-    CharT* current = aBuffer->start;
-    if (eollast) { // Case 4
-      if (*current == '\n') {
-        aBuffer->start = ++current;
-        *aMore = true;
-        return NS_OK;
-      }
-      else {
-        eollast = false;
-        aLine.Append('\r');
-      }
-    }
-    // Cases 2 and 3
-    for ( ; current < aBuffer->end-1; ++current) {
-      if (*current == '\r' && *(current+1) == '\n') {
-        *current++ = '\0';
-        *current++ = '\0';
-        aLine.Append(aBuffer->start);
-        aBuffer->start = current;
-        *aMore = true;
-        return NS_OK;
-      }
-    }
-    // Case 1
-    if (*current == '\r') {
-      eollast = true;
-      *current++ = '\0';
-    }
-
-    aLine.Append(aBuffer->start);
-    aBuffer->start = aBuffer->end; // mark the buffer empty
-  }
-}
-
-// Each client HTTP request results in a thread being spawned to process it.
-// That thread has a single event dispatched to it which handles the HTTP
-// protocol. It parses the headers and forwards data from the MediaResource
-// associated with the URL back to client. When the request is complete it will
-// shutdown the thread.
-class ServeResourceEvent : public Runnable {
-private:
-  // Reading from this reads the data sent from the client.
-  nsCOMPtr<nsIInputStream> mInput;
-
-  // Writing to this sends data to the client.
-  nsCOMPtr<nsIOutputStream> mOutput;
-
-  // The AndroidMediaResourceServer that owns the MediaResource instances
-  // served. This is used to lookup the MediaResource from the URL.
-  RefPtr<AndroidMediaResourceServer> mServer;
-
-  // Write 'aBufferLength' bytes from 'aBuffer' to 'mOutput'. This
-  // method ensures all the data is written by checking the number
-  // of bytes returned from the output streams 'Write' method and
-  // looping until done.
-  nsresult WriteAll(char const* aBuffer, int32_t aBufferLength);
-
-public:
-  ServeResourceEvent(nsIInputStream* aInput, nsIOutputStream* aOutput,
-                     AndroidMediaResourceServer* aServer)
-    : mInput(aInput), mOutput(aOutput), mServer(aServer) {}
-
-  // This method runs on the thread and exits when it has completed the
-  // HTTP request.
-  NS_IMETHOD Run();
-
-  // Given the first line of an HTTP request, parse the URL requested and
-  // return the MediaResource for that URL.
-  already_AddRefed<MediaResource> GetMediaResource(nsCString const& aHTTPRequest);
-
-  // Gracefully shutdown the thread and cleanup resources
-  void Shutdown();
-};
-
-nsresult
-ServeResourceEvent::WriteAll(char const* aBuffer, int32_t aBufferLength)
-{
-  while (aBufferLength > 0) {
-    uint32_t written = 0;
-    nsresult rv = mOutput->Write(aBuffer, aBufferLength, &written);
-    if (NS_FAILED (rv)) return rv;
-
-    aBufferLength -= written;
-    aBuffer += written;
-  }
-
-  return NS_OK;
-}
-
-already_AddRefed<MediaResource>
-ServeResourceEvent::GetMediaResource(nsCString const& aHTTPRequest)
-{
-  // Check that the HTTP method is GET
-  const char* HTTP_METHOD = "GET ";
-  if (strncmp(aHTTPRequest.get(), HTTP_METHOD, strlen(HTTP_METHOD)) != 0) {
-    return nullptr;
-  }
-
-  const char* url_start = strchr(aHTTPRequest.get(), ' ');
-  if (!url_start) {
-    return nullptr;
-  }
-
-  const char* url_end = strrchr(++url_start, ' ');
-  if (!url_end) {
-    return nullptr;
-  }
-
-  // The path extracted from the HTTP request is used as a key in hash
-  // table. It is not related to retrieving data from the filesystem so
-  // we don't need to do any sanity checking on ".." paths and similar
-  // exploits.
-  nsCString relative(url_start, url_end - url_start);
-  RefPtr<MediaResource> resource =
-    mServer->GetResource(mServer->GetURLPrefix() + relative);
-  return resource.forget();
-}
-
-NS_IMETHODIMP
-ServeResourceEvent::Run() {
-  bool more = false; // Are there HTTP headers to read after the first line
-  nsCString line;    // Contains the current line read from input stream
-  nsLineBuffer<char>* buffer = new nsLineBuffer<char>();
-  nsresult rv = ReadCRLF(mInput.get(), buffer, line, &more);
-  if (NS_FAILED(rv)) { Shutdown(); return rv; }
-
-  // First line contains the HTTP GET request. Extract the URL and obtain
-  // the MediaResource for it.
-  RefPtr<MediaResource> resource = GetMediaResource(line);
-  if (!resource) {
-    const char* response_404 = "HTTP/1.1 404 Not Found\r\n"
-                               "Content-Length: 0\r\n\r\n";
-    rv = WriteAll(response_404, strlen(response_404));
-    Shutdown();
-    return rv;
-  }
-
-  // Offset in bytes to start reading from resource.
-  // This is zero by default but can be set to another starting value if
-  // this HTTP request includes a byte range request header.
-  int64_t start = 0;
-
-  // Keep reading lines until we get a zero length line, which is the HTTP
-  // protocol's way of signifying the end of headers and start of body, or
-  // until we have no more data to read.
-  while (more && line.Length() > 0) {
-    rv = ReadCRLF(mInput.get(), buffer, line, &more);
-    if (NS_FAILED(rv)) { Shutdown(); return rv; }
-
-    // Look for a byte range request header. If there is one, set the
-    // media resource offset to start from to that requested. Here we
-    // only check for the range request format used by Android rather
-    // than implementing all possibilities in the HTTP specification.
-    // That is, the range request is of the form:
-    //   Range: bytes=nnnn-
-    // Were 'nnnn' is an integer number.
-    // The end of the range is not checked, instead we return up to
-    // the end of the resource and the client is informed of this via
-    // the content-range header.
-    NS_NAMED_LITERAL_CSTRING(byteRange, "Range: bytes=");
-    const char* s = strstr(line.get(), byteRange.get());
-    if (s) {
-      start = strtoll(s+byteRange.Length(), nullptr, 10);
-
-      // Clamp 'start' to be between 0 and the resource length.
-      start = std::max(int64_t(0), std::min(resource->GetLength(), start));
-    }
-  }
-
-  // HTTP response to use if this is a non byte range request
-  const char* response_normal = "HTTP/1.1 200 OK\r\n";
-
-  // HTTP response to use if this is a byte range request
-  const char* response_range = "HTTP/1.1 206 Partial Content\r\n";
-
-  // End of HTTP reponse headers is indicated by an empty line.
-  const char* response_end = "\r\n";
-
-  // If the request was a byte range request, we need to read from the
-  // requested offset. If the resource is non-seekable, or the seek
-  // fails, then the start offset is set back to zero. This results in all
-  // HTTP response data being as if the byte range request was not made.
-  if (start > 0 && !resource->IsTransportSeekable()) {
-    start = 0;
-  }
-
-  const char* response_line = start > 0 ?
-                                response_range :
-                                response_normal;
-  rv = WriteAll(response_line, strlen(response_line));
-  if (NS_FAILED(rv)) { Shutdown(); return NS_OK; }
-
-  // Buffer used for reading from the input stream and writing to
-  // the output stream. The buffer size should be big enough for the
-  // HTTP response headers sent below. A static_assert ensures
-  // this where the buffer is used.
-  const int buffer_size = 32768;
-  auto b = MakeUnique<char[]>(buffer_size);
-
-  // If we know the length of the resource, send a Content-Length header.
-  int64_t contentlength = resource->GetLength() - start;
-  if (contentlength > 0) {
-    static_assert (buffer_size > 1024,
-                   "buffer_size must be large enough "
-                   "to hold response headers");
-    snprintf(b.get(), buffer_size, "Content-Length: %" PRId64 "\r\n", contentlength);
-    rv = WriteAll(b.get(), strlen(b.get()));
-    if (NS_FAILED(rv)) { Shutdown(); return NS_OK; }
-  }
-
-  // If the request was a byte range request, respond with a Content-Range
-  // header which details the extent of the data returned.
-  if (start > 0) {
-    static_assert (buffer_size > 1024,
-                   "buffer_size must be large enough "
-                   "to hold response headers");
-    snprintf(b.get(), buffer_size, "Content-Range: "
-             "bytes %" PRId64 "-%" PRId64 "/%" PRId64 "\r\n",
-             start, resource->GetLength() - 1, resource->GetLength());
-    rv = WriteAll(b.get(), strlen(b.get()));
-    if (NS_FAILED(rv)) { Shutdown(); return NS_OK; }
-  }
-
-  rv = WriteAll(response_end, strlen(response_end));
-  if (NS_FAILED(rv)) { Shutdown(); return NS_OK; }
-
-  rv = mOutput->Flush();
-  if (NS_FAILED(rv)) { Shutdown(); return NS_OK; }
-
-  // Read data from media resource
-  uint32_t bytesRead = 0; // Number of bytes read/written to streams
-  rv = resource->ReadAt(start, b.get(), buffer_size, &bytesRead);
-  while (NS_SUCCEEDED(rv) && bytesRead != 0) {
-    // Keep track of what we think the starting position for the next read
-    // is. This is used in subsequent ReadAt calls to ensure we are reading
-    // from the correct offset in the case where another thread is reading
-    // from th same MediaResource.
-    start += bytesRead;
-
-    // Write data obtained from media resource to output stream
-    rv = WriteAll(b.get(), bytesRead);
-    if (NS_FAILED (rv)) break;
-
-    rv = resource->ReadAt(start, b.get(), 32768, &bytesRead);
-  }
-
-  Shutdown();
-  return NS_OK;
-}
-
-void
-ServeResourceEvent::Shutdown()
-{
-  // Cleanup resources and exit.
-  mInput->Close();
-  mOutput->Close();
-
-  // To shutdown the current thread we need to first exit this event.
-  // The Shutdown event below is posted to the main thread to do this.
-  nsCOMPtr<nsIRunnable> event = new ShutdownThreadEvent(NS_GetCurrentThread());
-  NS_DispatchToMainThread(event);
-}
-
-/*
-  This is the listener attached to the server socket. When an HTTP
-  request is made by the client the OnSocketAccepted method is
-  called. This method will spawn a thread to process the request.
-  The thread receives a single event which does the parsing of
-  the HTTP request and forwarding the data from the MediaResource
-  to the output stream of the request.
-
-  The MediaResource used for providing the request data is obtained
-  from the AndroidMediaResourceServer that created this listener, using the
-  URL the client requested.
-*/
-class ResourceSocketListener : public nsIServerSocketListener
-{
-public:
-  // The AndroidMediaResourceServer used to look up the MediaResource
-  // on requests.
-  RefPtr<AndroidMediaResourceServer> mServer;
-
-  NS_DECL_THREADSAFE_ISUPPORTS
-  NS_DECL_NSISERVERSOCKETLISTENER
-
-  ResourceSocketListener(AndroidMediaResourceServer* aServer) :
-    mServer(aServer)
-  {
-  }
-
-private:
-  virtual ~ResourceSocketListener() { }
-};
-
-NS_IMPL_ISUPPORTS(ResourceSocketListener, nsIServerSocketListener)
-
-NS_IMETHODIMP
-ResourceSocketListener::OnSocketAccepted(nsIServerSocket* aServ,
-                                         nsISocketTransport* aTrans)
-{
-  nsCOMPtr<nsIInputStream> input;
-  nsCOMPtr<nsIOutputStream> output;
-  nsresult rv;
-
-  rv = aTrans->OpenInputStream(nsITransport::OPEN_BLOCKING, 0, 0, getter_AddRefs(input));
-  if (NS_FAILED(rv)) return rv;
-
-  rv = aTrans->OpenOutputStream(nsITransport::OPEN_BLOCKING, 0, 0, getter_AddRefs(output));
-  if (NS_FAILED(rv)) return rv;
-
-  nsCOMPtr<nsIThread> thread;
-  rv = NS_NewThread(getter_AddRefs(thread));
-  if (NS_FAILED(rv)) return rv;
-
-  nsCOMPtr<nsIRunnable> event = new ServeResourceEvent(input.get(), output.get(), mServer);
-  return thread->Dispatch(event, NS_DISPATCH_NORMAL);
-}
-
-NS_IMETHODIMP
-ResourceSocketListener::OnStopListening(nsIServerSocket* aServ, nsresult aStatus)
-{
-  return NS_OK;
-}
-
-AndroidMediaResourceServer::AndroidMediaResourceServer() :
-  mMutex("AndroidMediaResourceServer")
-{
-}
-
-NS_IMETHODIMP
-AndroidMediaResourceServer::Run()
-{
-  MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
-  MutexAutoLock lock(mMutex);
-
-  nsresult rv;
-  mSocket = do_CreateInstance(NS_SERVERSOCKET_CONTRACTID, &rv);
-  if (NS_FAILED(rv)) return rv;
-
-  rv = mSocket->InitSpecialConnection(-1,
-                                      nsIServerSocket::LoopbackOnly
-                                      | nsIServerSocket::KeepWhenOffline,
-                                      -1);
-  if (NS_FAILED(rv)) return rv;
-
-  rv = mSocket->AsyncListen(new ResourceSocketListener(this));
-  if (NS_FAILED(rv)) return rv;
-
-  return NS_OK;
-}
-
-/* static */
-already_AddRefed<AndroidMediaResourceServer>
-AndroidMediaResourceServer::Start()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-  RefPtr<AndroidMediaResourceServer> server = new AndroidMediaResourceServer();
-  server->Run();
-  return server.forget();
-}
-
-void
-AndroidMediaResourceServer::Stop()
-{
-  MutexAutoLock lock(mMutex);
-  mSocket->Close();
-  mSocket = nullptr;
-}
-
-nsresult
-AndroidMediaResourceServer::AppendRandomPath(nsCString& aUrl)
-{
-  // Use a cryptographic quality PRNG to generate raw random bytes
-  // and convert that to a base64 string for use as an URL path. This
-  // is based on code from nsExternalAppHandler::SetUpTempFile.
-  nsresult rv;
-  nsAutoCString salt;
-  rv = GenerateRandomPathName(salt, 16);
-  if (NS_FAILED(rv)) return rv;
-  aUrl += "/";
-  aUrl += salt;
-  return NS_OK;
-}
-
-nsresult
-AndroidMediaResourceServer::AddResource(mozilla::MediaResource* aResource, nsCString& aUrl)
-{
-  nsCString url = GetURLPrefix();
-  nsresult rv = AppendRandomPath(url);
-  if (NS_FAILED (rv)) return rv;
-
-  {
-    MutexAutoLock lock(mMutex);
-
-    // Adding a resource URL that already exists is considered an error.
-    if (mResources.find(url) != mResources.end()) return NS_ERROR_FAILURE;
-    mResources[url] = aResource;
-  }
-
-  aUrl = url;
-
-  return NS_OK;
-}
-
-void
-AndroidMediaResourceServer::RemoveResource(nsCString const& aUrl)
-{
-  MutexAutoLock lock(mMutex);
-  mResources.erase(aUrl);
-}
-
-nsCString
-AndroidMediaResourceServer::GetURLPrefix()
-{
-  MutexAutoLock lock(mMutex);
-
-  int32_t port = 0;
-  nsresult rv = mSocket->GetPort(&port);
-  if (NS_FAILED (rv) || port < 0) {
-    return nsCString("");
-  }
-
-  char buffer[256];
-  snprintf(buffer, sizeof(buffer), "http://127.0.0.1:%d", port >= 0 ? port : 0);
-  return nsCString(buffer);
-}
-
-already_AddRefed<MediaResource>
-AndroidMediaResourceServer::GetResource(nsCString const& aUrl)
-{
-  MutexAutoLock lock(mMutex);
-  ResourceMap::const_iterator it = mResources.find(aUrl);
-  if (it == mResources.end()) return nullptr;
-
-  RefPtr<MediaResource> resource = it->second;
-  return resource.forget();
-}
diff --git a/dom/media/android/AndroidMediaResourceServer.h b/dom/media/android/AndroidMediaResourceServer.h
deleted file mode 100644
index 68200f9c0..000000000
--- a/dom/media/android/AndroidMediaResourceServer.h
+++ /dev/null
@@ -1,96 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-#if !defined(AndroidMediaResourceServer_h_)
-#define AndroidMediaResourceServer_h_
-
-#include <map>
-#include "nsIServerSocket.h"
-#include "MediaResource.h"
-
-namespace mozilla {
-
-class MediaResource;
-
-/*
-  AndroidMediaResourceServer instantiates a socket server that understands
-  HTTP requests for MediaResource instances. The server runs on an
-  automatically selected port and MediaResource instances are registered.
-  The registration returns a string URL than can be used to fetch the
-  resource. That URL contains a randomly generated path to make it
-  difficult for other local applications on the device to guess it.
-
-  The HTTP protocol is limited in that it supports only what the
-  Android DataSource implementation uses to fetch media. It
-  understands HTTP GET and byte range requests.
-
-  The intent of this class is to be used in Media backends that
-  have a system component that does its own network requests. These
-  requests are made against this server which then uses standard
-  Gecko network requests and media cache usage.
-
-  The AndroidMediaResourceServer can be instantiated on any thread and
-  its methods are threadsafe - they can be called on any thread.
-  The server socket itself is always run on the main thread and
-  this is done by the Start() static method by synchronously
-  dispatching to the main thread.
-*/
-class AndroidMediaResourceServer : public Runnable
-{
-private:
-  // Mutex protecting private members of AndroidMediaResourceServer.
-  // All member variables below this point in the class definition
-  // must acquire the mutex before access.
-  mozilla::Mutex mMutex;
-
-  // Server socket used to listen for incoming connections
-  nsCOMPtr<nsIServerSocket> mSocket;
-
-  // Mapping between MediaResource URL's to the MediaResource
-  // object served at that URL.
-  typedef std::map<nsCString,
-                  RefPtr<mozilla::MediaResource> > ResourceMap;
-  ResourceMap mResources;
-
-  // Create a AndroidMediaResourceServer that will listen on an automatically
-  // selected port when started. This is private as it should only be
-  // called internally from the public 'Start' method.
-  AndroidMediaResourceServer();
-  NS_IMETHOD Run();
-
-  // Append a random URL path to a string. This is used for creating a
-  // unique URl for a resource which helps prevent malicious software
-  // running on the same machine as the server from guessing the URL
-  // and accessing video data.
-  nsresult AppendRandomPath(nsCString& aURL);
-
-public:
-  // Create a AndroidMediaResourceServer and start it listening. This call will
-  // perform a synchronous request on the main thread.
-  static already_AddRefed<AndroidMediaResourceServer> Start();
-
-  // Stops the server from listening and accepting further connections.
-  void Stop();
-
-  // Add a MediaResource to be served by this server. Stores the
-  // absolute URL that can be used to access the resource in 'aUrl'.
-  nsresult AddResource(mozilla::MediaResource* aResource, nsCString& aUrl);
-
-  // Remove a MediaResource so it is no longer served by this server.
-  // The URL provided must match exactly that provided by a previous
-  // call to "AddResource".
-  void RemoveResource(nsCString const& aUrl);
-
-  // Returns the prefix for HTTP requests to the server. This plus
-  // the result of AddResource results in an Absolute URL.
-  nsCString GetURLPrefix();
-
-  // Returns the resource asociated with a given URL
-  already_AddRefed<mozilla::MediaResource> GetResource(nsCString const& aUrl);
-};
-
-} // namespace mozilla
-
-#endif
diff --git a/dom/media/android/MPAPI.h b/dom/media/android/MPAPI.h
deleted file mode 100644
index 9b289ca09..000000000
--- a/dom/media/android/MPAPI.h
+++ /dev/null
@@ -1,165 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-#if !defined(MPAPI_h_)
-#define MPAPI_h_
-
-#include <stdint.h>
-
-namespace MPAPI {
-
-enum ColorFormat {
-  I420,
-  RGB565
-};
-
-/*
- * A callback for the plugin to use to request a buffer owned by gecko. This can
- * save us a copy or two down the line.
- */
-class BufferCallback {
-public:
-  virtual void *operator()(size_t aWidth, size_t aHeight,
-                           ColorFormat aColorFormat) = 0;
-};
-
-struct VideoPlane {
-  VideoPlane() :
-    mData(0),
-    mStride(0),
-    mWidth(0),
-    mHeight(0),
-    mOffset(0),
-    mSkip(0)
-  {}
-
-  void *mData;
-  int32_t mStride;
-  int32_t mWidth;
-  int32_t mHeight;
-  int32_t mOffset;
-  int32_t mSkip;
-};
-
-struct VideoFrame {
-  int64_t mTimeUs;
-  bool mKeyFrame;
-  void *mData;
-  size_t mSize;
-  int32_t mStride;
-  int32_t mSliceHeight;
-  int32_t mRotation;
-  VideoPlane Y;
-  VideoPlane Cb;
-  VideoPlane Cr;
-
-  VideoFrame() :
-    mTimeUs(0),
-    mKeyFrame(false),
-    mData(0),
-    mSize(0),
-    mStride(0),
-    mSliceHeight(0),
-    mRotation(0)
-  {}
-
-  void Set(int64_t aTimeUs, bool aKeyFrame,
-           void *aData, size_t aSize, int32_t aStride, int32_t aSliceHeight, int32_t aRotation,
-           void *aYData, int32_t aYStride, int32_t aYWidth, int32_t aYHeight, int32_t aYOffset, int32_t aYSkip,
-           void *aCbData, int32_t aCbStride, int32_t aCbWidth, int32_t aCbHeight, int32_t aCbOffset, int32_t aCbSkip,
-           void *aCrData, int32_t aCrStride, int32_t aCrWidth, int32_t aCrHeight, int32_t aCrOffset, int32_t aCrSkip)
-  {
-    mTimeUs = aTimeUs;
-    mKeyFrame = aKeyFrame;
-    mData = aData;
-    mSize = aSize;
-    mStride = aStride;
-    mSliceHeight = aSliceHeight;
-    mRotation = aRotation;
-    Y.mData = aYData;
-    Y.mStride = aYStride;
-    Y.mWidth = aYWidth;
-    Y.mHeight = aYHeight;
-    Y.mOffset = aYOffset;
-    Y.mSkip = aYSkip;
-    Cb.mData = aCbData;
-    Cb.mStride = aCbStride;
-    Cb.mWidth = aCbWidth;
-    Cb.mHeight = aCbHeight;
-    Cb.mOffset = aCbOffset;
-    Cb.mSkip = aCbSkip;
-    Cr.mData = aCrData;
-    Cr.mStride = aCrStride;
-    Cr.mWidth = aCrWidth;
-    Cr.mHeight = aCrHeight;
-    Cr.mOffset = aCrOffset;
-    Cr.mSkip = aCrSkip;
-  }
-};
-
-struct AudioFrame {
-  int64_t mTimeUs;
-  void *mData; // 16PCM interleaved
-  size_t mSize; // Size of mData in bytes
-  int32_t mAudioChannels;
-  int32_t mAudioSampleRate;
-
-  AudioFrame() :
-    mTimeUs(0),
-    mData(0),
-    mSize(0),
-    mAudioChannels(0),
-    mAudioSampleRate(0)
-  {
-  }
-
-  void Set(int64_t aTimeUs,
-           void *aData, size_t aSize,
-           int32_t aAudioChannels, int32_t aAudioSampleRate)
-  {
-    mTimeUs = aTimeUs;
-    mData = aData;
-    mSize = aSize;
-    mAudioChannels = aAudioChannels;
-    mAudioSampleRate = aAudioSampleRate;
-  }
-};
-
-struct Decoder;
-
-struct PluginHost {
-  bool (*Read)(Decoder *aDecoder, char *aBuffer, int64_t aOffset, uint32_t aCount, uint32_t* aBytes);
-  uint64_t (*GetLength)(Decoder *aDecoder);
-  void (*SetMetaDataReadMode)(Decoder *aDecoder);
-  void (*SetPlaybackReadMode)(Decoder *aDecoder);
-  bool (*GetIntPref)(const char *aPref, int32_t *aResult);
-  bool (*GetSystemInfoString)(const char *aKey, char *aResult, size_t aResultLen);
-};
-
-struct Decoder {
-  void *mResource;
-  void *mPrivate;
-
-  Decoder();
-
-  void (*GetDuration)(Decoder *aDecoder, int64_t *durationUs);
-  void (*GetVideoParameters)(Decoder *aDecoder, int32_t *aWidth, int32_t *aHeight);
-  void (*GetAudioParameters)(Decoder *aDecoder, int32_t *aNumChannels, int32_t *aSampleRate);
-  bool (*HasVideo)(Decoder *aDecoder);
-  bool (*HasAudio)(Decoder *aDecoder);
-  bool (*ReadVideo)(Decoder *aDecoder, VideoFrame *aFrame, int64_t aSeekTimeUs, BufferCallback *aBufferCallback);
-  bool (*ReadAudio)(Decoder *aDecoder, AudioFrame *aFrame, int64_t aSeekTimeUs);
-  void (*DestroyDecoder)(Decoder *);
-};
-
-struct Manifest {
-  bool (*CanDecode)(const char *aMimeChars, size_t aMimeLen, const char* const**aCodecs);
-  bool (*CreateDecoder)(PluginHost *aPluginHost, Decoder *aDecoder,
-                        const char *aMimeChars, size_t aMimeLen);
-};
-
-}
-
-#endif
diff --git a/dom/media/android/moz.build b/dom/media/android/moz.build
deleted file mode 100644
index 3ad43cd50..000000000
--- a/dom/media/android/moz.build
+++ /dev/null
@@ -1,27 +0,0 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-EXPORTS += [
-    'AndroidMediaDecoder.h',
-    'AndroidMediaPluginHost.h',
-    'AndroidMediaReader.h',
-    'AndroidMediaResourceServer.h',
-    'MPAPI.h',
-]
-
-UNIFIED_SOURCES += [
-    'AndroidMediaDecoder.cpp',
-    'AndroidMediaPluginHost.cpp',
-    'AndroidMediaReader.cpp',
-    'AndroidMediaResourceServer.cpp',
-]
-
-LOCAL_INCLUDES += [
-    '/dom/base',
-    '/dom/html',
-]
-
-FINAL_LIBRARY = 'xul'
diff --git a/dom/media/directshow/AudioSinkFilter.cpp b/dom/media/directshow/AudioSinkFilter.cpp
deleted file mode 100644
index 9f23c0e00..000000000
--- a/dom/media/directshow/AudioSinkFilter.cpp
+++ /dev/null
@@ -1,285 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "SampleSink.h"
-#include "AudioSinkFilter.h"
-#include "AudioSinkInputPin.h"
-#include "VideoUtils.h"
-#include "mozilla/Logging.h"
-
-
-#include <initguid.h>
-#include <wmsdkidl.h>
-
-#define DELETE_RESET(p) { delete (p) ; (p) = nullptr ;}
-
-DEFINE_GUID(CLSID_MozAudioSinkFilter, 0x1872d8c8, 0xea8d, 0x4c34, 0xae, 0x96, 0x69, 0xde,
-            0xf1, 0x33, 0x7b, 0x33);
-
-using namespace mozilla::media;
-
-namespace mozilla {
-
-static LazyLogModule gDirectShowLog("DirectShowDecoder");
-#define LOG(...) MOZ_LOG(gDirectShowLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
-
-AudioSinkFilter::AudioSinkFilter(const wchar_t* aObjectName, HRESULT* aOutResult)
-  : BaseFilter(aObjectName, CLSID_MozAudioSinkFilter),
-    mFilterCritSec("AudioSinkFilter::mFilterCritSec")
-{
-  (*aOutResult) = S_OK;
-  mInputPin = new AudioSinkInputPin(L"AudioSinkInputPin",
-                                    this,
-                                    &mFilterCritSec,
-                                    aOutResult);
-}
-
-AudioSinkFilter::~AudioSinkFilter()
-{
-}
-
-int
-AudioSinkFilter::GetPinCount()
-{
-  return 1;
-}
-
-BasePin*
-AudioSinkFilter::GetPin(int aIndex)
-{
-  CriticalSectionAutoEnter lockFilter(mFilterCritSec);
-  return (aIndex == 0) ? static_cast<BasePin*>(mInputPin) : nullptr;
-}
-
-HRESULT
-AudioSinkFilter::Pause()
-{
-  CriticalSectionAutoEnter lockFilter(mFilterCritSec);
-  if (mState == State_Stopped) {
-    //  Change the state, THEN activate the input pin.
-    mState = State_Paused;
-    if (mInputPin && mInputPin->IsConnected()) {
-      mInputPin->Active();
-    }
-  } else if (mState == State_Running) {
-    mState = State_Paused;
-  }
-  return S_OK;
-}
-
-HRESULT
-AudioSinkFilter::Stop()
-{
-  CriticalSectionAutoEnter lockFilter(mFilterCritSec);
-  mState = State_Stopped;
-  if (mInputPin) {
-    mInputPin->Inactive();
-  }
-
-  GetSampleSink()->Flush();
-
-  return S_OK;
-}
-
-HRESULT
-AudioSinkFilter::Run(REFERENCE_TIME tStart)
-{
-  LOG("AudioSinkFilter::Run(%lld) [%4.2lf]",
-      RefTimeToUsecs(tStart),
-      double(RefTimeToUsecs(tStart)) / USECS_PER_S);
-  return media::BaseFilter::Run(tStart);
-}
-
-HRESULT
-AudioSinkFilter::GetClassID( OUT CLSID * pCLSID )
-{
-  (* pCLSID) = CLSID_MozAudioSinkFilter;
-  return S_OK;
-}
-
-HRESULT
-AudioSinkFilter::QueryInterface(REFIID aIId, void **aInterface)
-{
-  if (aIId == IID_IMediaSeeking) {
-    *aInterface = static_cast<IMediaSeeking*>(this);
-    AddRef();
-    return S_OK;
-  }
-  return mozilla::media::BaseFilter::QueryInterface(aIId, aInterface);
-}
-
-ULONG
-AudioSinkFilter::AddRef()
-{
-  return ::InterlockedIncrement(&mRefCnt);
-}
-
-ULONG
-AudioSinkFilter::Release()
-{
-  unsigned long newRefCnt = ::InterlockedDecrement(&mRefCnt);
-  if (!newRefCnt) {
-    delete this;
-  }
-  return newRefCnt;
-}
-
-SampleSink*
-AudioSinkFilter::GetSampleSink()
-{
-  return mInputPin->GetSampleSink();
-}
-
-
-// IMediaSeeking implementation.
-//
-// Calls to IMediaSeeking are forwarded to the output pin that the
-// AudioSinkInputPin is connected to, i.e. upstream towards the parser and
-// source filters, which actually implement seeking.
-#define ENSURE_CONNECTED_PIN_SEEKING \
-  if (!mInputPin) { \
-    return E_NOTIMPL; \
-  } \
-  RefPtr<IMediaSeeking> pinSeeking = mInputPin->GetConnectedPinSeeking(); \
-  if (!pinSeeking) { \
-    return E_NOTIMPL; \
-  }
-
-HRESULT
-AudioSinkFilter::GetCapabilities(DWORD* aCapabilities)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->GetCapabilities(aCapabilities);
-}
-
-HRESULT
-AudioSinkFilter::CheckCapabilities(DWORD* aCapabilities)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->CheckCapabilities(aCapabilities);
-}
-
-HRESULT
-AudioSinkFilter::IsFormatSupported(const GUID* aFormat)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->IsFormatSupported(aFormat);
-}
-
-HRESULT
-AudioSinkFilter::QueryPreferredFormat(GUID* aFormat)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->QueryPreferredFormat(aFormat);
-}
-
-HRESULT
-AudioSinkFilter::GetTimeFormat(GUID* aFormat)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->GetTimeFormat(aFormat);
-}
-
-HRESULT
-AudioSinkFilter::IsUsingTimeFormat(const GUID* aFormat)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->IsUsingTimeFormat(aFormat);
-}
-
-HRESULT
-AudioSinkFilter::SetTimeFormat(const GUID* aFormat)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->SetTimeFormat(aFormat);
-}
-
-HRESULT
-AudioSinkFilter::GetDuration(LONGLONG* aDuration)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->GetDuration(aDuration);
-}
-
-HRESULT
-AudioSinkFilter::GetStopPosition(LONGLONG* aStop)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->GetStopPosition(aStop);
-}
-
-HRESULT
-AudioSinkFilter::GetCurrentPosition(LONGLONG* aCurrent)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->GetCurrentPosition(aCurrent);
-}
-
-HRESULT
-AudioSinkFilter::ConvertTimeFormat(LONGLONG* aTarget,
-                                   const GUID* aTargetFormat,
-                                   LONGLONG aSource,
-                                   const GUID* aSourceFormat)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->ConvertTimeFormat(aTarget,
-                                       aTargetFormat,
-                                       aSource,
-                                       aSourceFormat);
-}
-
-HRESULT
-AudioSinkFilter::SetPositions(LONGLONG* aCurrent,
-                              DWORD aCurrentFlags,
-                              LONGLONG* aStop,
-                              DWORD aStopFlags)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->SetPositions(aCurrent,
-                                  aCurrentFlags,
-                                  aStop,
-                                  aStopFlags);
-}
-
-HRESULT
-AudioSinkFilter::GetPositions(LONGLONG* aCurrent,
-                              LONGLONG* aStop)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->GetPositions(aCurrent, aStop);
-}
-
-HRESULT
-AudioSinkFilter::GetAvailable(LONGLONG* aEarliest,
-                              LONGLONG* aLatest)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->GetAvailable(aEarliest, aLatest);
-}
-
-HRESULT
-AudioSinkFilter::SetRate(double aRate)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->SetRate(aRate);
-}
-
-HRESULT
-AudioSinkFilter::GetRate(double* aRate)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->GetRate(aRate);
-}
-
-HRESULT
-AudioSinkFilter::GetPreroll(LONGLONG* aPreroll)
-{
-  ENSURE_CONNECTED_PIN_SEEKING
-  return pinSeeking->GetPreroll(aPreroll);
-}
-
-} // namespace mozilla
-
diff --git a/dom/media/directshow/AudioSinkFilter.h b/dom/media/directshow/AudioSinkFilter.h
deleted file mode 100644
index 85abdfccf..000000000
--- a/dom/media/directshow/AudioSinkFilter.h
+++ /dev/null
@@ -1,95 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#if !defined(AudioSinkFilter_h_)
-#define AudioSinkFilter_h_
-
-#include "BaseFilter.h"
-#include "DirectShowUtils.h"
-#include "nsAutoPtr.h"
-#include "mozilla/RefPtr.h"
-
-namespace mozilla {
-
-class AudioSinkInputPin;
-class SampleSink;
-
-// Filter that acts as the end of the graph. Audio samples input into
-// this filter block the calling thread, and the calling thread is
-// unblocked when the decode thread extracts the sample. The samples
-// input into this filter are stored in the SampleSink, where the blocking
-// is implemented. The input pin owns the SampleSink.
-class AudioSinkFilter: public mozilla::media::BaseFilter,
-                       public IMediaSeeking
-{
-
-public:
-  AudioSinkFilter(const wchar_t* aObjectName, HRESULT* aOutResult);
-  virtual ~AudioSinkFilter();
-
-  // Gets the input pin's sample sink.
-  SampleSink* GetSampleSink();
-
-  // IUnknown implementation.
-  STDMETHODIMP QueryInterface(REFIID aIId, void **aInterface);
-  STDMETHODIMP_(ULONG) AddRef();
-  STDMETHODIMP_(ULONG) Release();
-
-  //  --------------------------------------------------------------------
-  //  CBaseFilter methods
-  int GetPinCount ();
-  mozilla::media::BasePin* GetPin ( IN int Index);
-  STDMETHODIMP Pause ();
-  STDMETHODIMP Stop ();
-  STDMETHODIMP GetClassID ( OUT CLSID * pCLSID);
-  STDMETHODIMP Run(REFERENCE_TIME tStart);
-  // IMediaSeeking Methods...
-
-  // We defer to SourceFilter, but we must expose the interface on
-  // the output pins. Seeking commands come upstream from the renderers,
-  // but they must be actioned at the source filters.
-  STDMETHODIMP GetCapabilities(DWORD* aCapabilities);
-  STDMETHODIMP CheckCapabilities(DWORD* aCapabilities);
-  STDMETHODIMP IsFormatSupported(const GUID* aFormat);
-  STDMETHODIMP QueryPreferredFormat(GUID* aFormat);
-  STDMETHODIMP GetTimeFormat(GUID* aFormat);
-  STDMETHODIMP IsUsingTimeFormat(const GUID* aFormat);
-  STDMETHODIMP SetTimeFormat(const GUID* aFormat);
-  STDMETHODIMP GetDuration(LONGLONG* pDuration);
-  STDMETHODIMP GetStopPosition(LONGLONG* pStop);
-  STDMETHODIMP GetCurrentPosition(LONGLONG* aCurrent);
-  STDMETHODIMP ConvertTimeFormat(LONGLONG* aTarget,
-                                 const GUID* aTargetFormat,
-                                 LONGLONG aSource,
-                                 const GUID* aSourceFormat);
-  STDMETHODIMP SetPositions(LONGLONG* aCurrent,
-                            DWORD aCurrentFlags,
-                            LONGLONG* aStop,
-                            DWORD aStopFlags);
-  STDMETHODIMP GetPositions(LONGLONG* aCurrent,
-                            LONGLONG* aStop);
-  STDMETHODIMP GetAvailable(LONGLONG* aEarliest,
-                            LONGLONG* aLatest);
-  STDMETHODIMP SetRate(double aRate);
-  STDMETHODIMP GetRate(double* aRate);
-  STDMETHODIMP GetPreroll(LONGLONG* aPreroll);
-
-  //  --------------------------------------------------------------------
-  //  class factory calls this
-  static IUnknown * CreateInstance (IN LPUNKNOWN punk, OUT HRESULT * phr);
-
-private:
-  CriticalSection mFilterCritSec;
-
-  // Note: The input pin defers its refcounting to the sink filter, so when
-  // the input pin is addrefed, what actually happens is the sink filter is
-  // addrefed.
-  nsAutoPtr<AudioSinkInputPin> mInputPin;
-};
-
-} // namespace mozilla
-
-#endif // AudioSinkFilter_h_
diff --git a/dom/media/directshow/AudioSinkInputPin.cpp b/dom/media/directshow/AudioSinkInputPin.cpp
deleted file mode 100644
index 85a6e3da3..000000000
--- a/dom/media/directshow/AudioSinkInputPin.cpp
+++ /dev/null
@@ -1,195 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "AudioSinkInputPin.h"
-#include "AudioSinkFilter.h"
-#include "SampleSink.h"
-#include "mozilla/Logging.h"
-
-#include <wmsdkidl.h>
-
-using namespace mozilla::media;
-
-namespace mozilla {
-
-static LazyLogModule gDirectShowLog("DirectShowDecoder");
-#define LOG(...) MOZ_LOG(gDirectShowLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
-
-AudioSinkInputPin::AudioSinkInputPin(wchar_t* aObjectName,
-                                     AudioSinkFilter* aFilter,
-                                     mozilla::CriticalSection* aLock,
-                                     HRESULT* aOutResult)
-  : BaseInputPin(aObjectName, aFilter, aLock, aOutResult, aObjectName),
-    mSegmentStartTime(0)
-{
-  MOZ_COUNT_CTOR(AudioSinkInputPin);
-  mSampleSink = new SampleSink();
-}
-
-AudioSinkInputPin::~AudioSinkInputPin()
-{
-  MOZ_COUNT_DTOR(AudioSinkInputPin);
-}
-
-HRESULT
-AudioSinkInputPin::GetMediaType(int aPosition, MediaType* aOutMediaType)
-{
-  NS_ENSURE_TRUE(aPosition >= 0, E_INVALIDARG);
-  NS_ENSURE_TRUE(aOutMediaType, E_POINTER);
-
-  if (aPosition > 0) {
-    return S_FALSE;
-  }
-
-  // Note: We set output as PCM, as IEEE_FLOAT only works when using the
-  // MP3 decoder as an MFT, and we can't do that while using DirectShow.
-  aOutMediaType->SetType(&MEDIATYPE_Audio);
-  aOutMediaType->SetSubtype(&MEDIASUBTYPE_PCM);
-  aOutMediaType->SetType(&FORMAT_WaveFormatEx);
-  aOutMediaType->SetTemporalCompression(FALSE);
-
-  return S_OK;
-}
-
-HRESULT
-AudioSinkInputPin::CheckMediaType(const MediaType* aMediaType)
-{
-  if (!aMediaType) {
-    return E_INVALIDARG;
-  }
-
-  GUID majorType = *aMediaType->Type();
-  if (majorType != MEDIATYPE_Audio && majorType != WMMEDIATYPE_Audio) {
-    return E_INVALIDARG;
-  }
-
-  if (*aMediaType->Subtype() != MEDIASUBTYPE_PCM) {
-    return E_INVALIDARG;
-  }
-
-  if (*aMediaType->FormatType() != FORMAT_WaveFormatEx) {
-    return E_INVALIDARG;
-  }
-
-  // We accept the media type, stash its layout format!
-  WAVEFORMATEX* wfx = (WAVEFORMATEX*)(aMediaType->pbFormat);
-  GetSampleSink()->SetAudioFormat(wfx);
-
-  return S_OK;
-}
-
-AudioSinkFilter*
-AudioSinkInputPin::GetAudioSinkFilter()
-{
-  return reinterpret_cast<AudioSinkFilter*>(mFilter);
-}
-
-SampleSink*
-AudioSinkInputPin::GetSampleSink()
-{
-  return mSampleSink;
-}
-
-HRESULT
-AudioSinkInputPin::SetAbsoluteMediaTime(IMediaSample* aSample)
-{
-  HRESULT hr;
-  REFERENCE_TIME start = 0, end = 0;
-  hr = aSample->GetTime(&start, &end);
-  NS_ENSURE_TRUE(SUCCEEDED(hr), E_FAIL);
-  {
-    CriticalSectionAutoEnter lock(*mLock);
-    start += mSegmentStartTime;
-    end += mSegmentStartTime;
-  }
-  hr = aSample->SetMediaTime(&start, &end);
-  NS_ENSURE_TRUE(SUCCEEDED(hr), E_FAIL);
-  return S_OK;
-}
-
-HRESULT
-AudioSinkInputPin::Receive(IMediaSample* aSample )
-{
-  HRESULT hr;
-  NS_ENSURE_TRUE(aSample, E_POINTER);
-
-  hr = BaseInputPin::Receive(aSample);
-  if (SUCCEEDED(hr) && hr != S_FALSE) { // S_FALSE == flushing
-    // Set the timestamp of the sample after being adjusted for
-    // seeking/segments in the "media time" attribute. When we seek,
-    // DirectShow starts a new "segment", and starts labeling samples
-    // from time=0 again, so we need to correct for this to get the
-    // actual timestamps after seeking.
-    hr = SetAbsoluteMediaTime(aSample);
-    NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
-    hr = GetSampleSink()->Receive(aSample);
-    NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
-  }
-  return S_OK;
-}
-
-already_AddRefed<IMediaSeeking>
-AudioSinkInputPin::GetConnectedPinSeeking()
-{
-  RefPtr<IPin> peer = GetConnected();
-  if (!peer)
-    return nullptr;
-  RefPtr<IMediaSeeking> seeking;
-  peer->QueryInterface(static_cast<IMediaSeeking**>(getter_AddRefs(seeking)));
-  return seeking.forget();
-}
-
-HRESULT
-AudioSinkInputPin::BeginFlush()
-{
-  HRESULT hr = media::BaseInputPin::BeginFlush();
-  NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
-
-  GetSampleSink()->Flush();
-
-  return S_OK;
-}
-
-HRESULT
-AudioSinkInputPin::EndFlush()
-{
-  HRESULT hr = media::BaseInputPin::EndFlush();
-  NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
-
-  // Reset the EOS flag, so that if we're called after a seek we still work.
-  GetSampleSink()->Reset();
-
-  return S_OK;
-}
-
-HRESULT
-AudioSinkInputPin::EndOfStream(void)
-{
-  HRESULT hr = media::BaseInputPin::EndOfStream();
-  if (FAILED(hr) || hr == S_FALSE) {
-    // Pin is stil flushing.
-    return hr;
-  }
-  GetSampleSink()->SetEOS();
-
-  return S_OK;
-}
-
-
-HRESULT
-AudioSinkInputPin::NewSegment(REFERENCE_TIME tStart,
-                              REFERENCE_TIME tStop,
-                              double dRate)
-{
-  CriticalSectionAutoEnter lock(*mLock);
-  // Record the start time of the new segment, so that we can store the
-  // correct absolute timestamp in the "media time" each incoming sample.
-  mSegmentStartTime = tStart;
-  return S_OK;
-}
-
-} // namespace mozilla
-
diff --git a/dom/media/directshow/AudioSinkInputPin.h b/dom/media/directshow/AudioSinkInputPin.h
deleted file mode 100644
index 80503c641..000000000
--- a/dom/media/directshow/AudioSinkInputPin.h
+++ /dev/null
@@ -1,76 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#if !defined(AudioSinkInputPin_h_)
-#define AudioSinkInputPin_h_
-
-#include "BaseInputPin.h"
-#include "DirectShowUtils.h"
-#include "mozilla/RefPtr.h"
-#include "nsAutoPtr.h"
-
-namespace mozilla {
-
-namespace media {
-  class MediaType;
-}
-
-class AudioSinkFilter;
-class SampleSink;
-
-
-// Input pin for capturing audio output of a DirectShow filter graph.
-// This is the input pin for the AudioSinkFilter.
-class AudioSinkInputPin: public mozilla::media::BaseInputPin
-{
-public:
-  AudioSinkInputPin(wchar_t* aObjectName,
-                    AudioSinkFilter* aFilter,
-                    mozilla::CriticalSection* aLock,
-                    HRESULT* aOutResult);
-  virtual ~AudioSinkInputPin();
-
-  HRESULT GetMediaType (IN int iPos, OUT mozilla::media::MediaType * pmt);
-  HRESULT CheckMediaType (IN const mozilla::media::MediaType * pmt);
-  STDMETHODIMP Receive (IN IMediaSample *);
-  STDMETHODIMP BeginFlush() override;
-  STDMETHODIMP EndFlush() override;
-
-  // Called when we start decoding a new segment, that happens directly after
-  // a seek. This captures the segment's start time. Samples decoded by the
-  // MP3 decoder have their timestamps offset from the segment start time.
-  // Storing the segment start time enables us to set each sample's MediaTime
-  // as an offset in the stream relative to the start of the stream, rather
-  // than the start of the segment, i.e. its absolute time in the stream.
-  STDMETHODIMP NewSegment(REFERENCE_TIME tStart,
-                          REFERENCE_TIME tStop,
-                          double dRate) override;
-
-  STDMETHODIMP EndOfStream() override;
-
-  // Returns the IMediaSeeking interface of the connected output pin.
-  // We forward seeking requests upstream from the sink to the source
-  // filters.
-  already_AddRefed<IMediaSeeking> GetConnectedPinSeeking();
-
-  SampleSink* GetSampleSink();
-
-private:
-  AudioSinkFilter* GetAudioSinkFilter();
-
-  // Sets the media time on the media sample, relative to the segment
-  // start time.
-  HRESULT SetAbsoluteMediaTime(IMediaSample* aSample);
-
-  nsAutoPtr<SampleSink> mSampleSink;
-
-  // Synchronized by the filter lock; BaseInputPin::mLock.
-  REFERENCE_TIME mSegmentStartTime;
-};
-
-} // namespace mozilla
-
-#endif // AudioSinkInputPin_h_
diff --git a/dom/media/directshow/DirectShowDecoder.cpp b/dom/media/directshow/DirectShowDecoder.cpp
deleted file mode 100644
index da68b4daa..000000000
--- a/dom/media/directshow/DirectShowDecoder.cpp
+++ /dev/null
@@ -1,65 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "DirectShowDecoder.h"
-#include "DirectShowReader.h"
-#include "DirectShowUtils.h"
-#include "MediaDecoderStateMachine.h"
-#include "mozilla/Preferences.h"
-#include "mozilla/WindowsVersion.h"
-
-namespace mozilla {
-
-MediaDecoderStateMachine* DirectShowDecoder::CreateStateMachine()
-{
-  return new MediaDecoderStateMachine(this, new DirectShowReader(this));
-}
-
-/* static */
-bool
-DirectShowDecoder::GetSupportedCodecs(const nsACString& aType,
-                                      char const *const ** aCodecList)
-{
-  if (!IsEnabled()) {
-    return false;
-  }
-
-  static char const *const mp3AudioCodecs[] = {
-    "mp3",
-    nullptr
-  };
-  if (aType.EqualsASCII("audio/mpeg") ||
-      aType.EqualsASCII("audio/mp3")) {
-    if (aCodecList) {
-      *aCodecList = mp3AudioCodecs;
-    }
-    return true;
-  }
-
-  return false;
-}
-
-/* static */
-bool
-DirectShowDecoder::IsEnabled()
-{
-  return CanDecodeMP3UsingDirectShow() &&
-         Preferences::GetBool("media.directshow.enabled");
-}
-
-DirectShowDecoder::DirectShowDecoder(MediaDecoderOwner* aOwner)
-  : MediaDecoder(aOwner)
-{
-  MOZ_COUNT_CTOR(DirectShowDecoder);
-}
-
-DirectShowDecoder::~DirectShowDecoder()
-{
-  MOZ_COUNT_DTOR(DirectShowDecoder);
-}
-
-} // namespace mozilla
-
diff --git a/dom/media/directshow/DirectShowDecoder.h b/dom/media/directshow/DirectShowDecoder.h
deleted file mode 100644
index c4d371fbf..000000000
--- a/dom/media/directshow/DirectShowDecoder.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#if !defined(DirectShowDecoder_h_)
-#define DirectShowDecoder_h_
-
-#include "MediaDecoder.h"
-
-namespace mozilla {
-
-// Decoder that uses DirectShow to playback MP3 files only.
-class DirectShowDecoder : public MediaDecoder
-{
-public:
-
-  explicit DirectShowDecoder(MediaDecoderOwner* aOwner);
-  virtual ~DirectShowDecoder();
-
-  MediaDecoder* Clone(MediaDecoderOwner* aOwner) override {
-    if (!IsEnabled()) {
-      return nullptr;
-    }
-    return new DirectShowDecoder(aOwner);
-  }
-
-  MediaDecoderStateMachine* CreateStateMachine() override;
-
-  // Returns true if aType is a MIME type that we render with the
-  // DirectShow backend. If aCodecList is non null,
-  // it is filled with a (static const) null-terminated list of strings
-  // denoting the codecs we'll playback. Note that playback is strictly
-  // limited to MP3 only.
-  static bool GetSupportedCodecs(const nsACString& aType,
-                                 char const *const ** aCodecList);
-
-  // Returns true if the DirectShow backend is preffed on.
-  static bool IsEnabled();
-};
-
-} // namespace mozilla
-
-#endif
diff --git a/dom/media/directshow/DirectShowReader.cpp b/dom/media/directshow/DirectShowReader.cpp
deleted file mode 100644
index cacf6f8de..000000000
--- a/dom/media/directshow/DirectShowReader.cpp
+++ /dev/null
@@ -1,360 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "DirectShowReader.h"
-#include "MediaDecoderReader.h"
-#include "mozilla/RefPtr.h"
-#include "DirectShowUtils.h"
-#include "AudioSinkFilter.h"
-#include "SourceFilter.h"
-#include "SampleSink.h"
-#include "VideoUtils.h"
-
-using namespace mozilla::media;
-
-namespace mozilla {
-
-// Windows XP's MP3 decoder filter. This is available on XP only, on Vista
-// and later we can use the DMO Wrapper filter and MP3 decoder DMO.
-const GUID DirectShowReader::CLSID_MPEG_LAYER_3_DECODER_FILTER =
-{ 0x38BE3000, 0xDBF4, 0x11D0, {0x86, 0x0E, 0x00, 0xA0, 0x24, 0xCF, 0xEF, 0x6D} };
-
-
-static LazyLogModule gDirectShowLog("DirectShowDecoder");
-#define LOG(...) MOZ_LOG(gDirectShowLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
-
-DirectShowReader::DirectShowReader(AbstractMediaDecoder* aDecoder)
-  : MediaDecoderReader(aDecoder),
-    mMP3FrameParser(aDecoder->GetResource()->GetLength()),
-#ifdef DIRECTSHOW_REGISTER_GRAPH
-    mRotRegister(0),
-#endif
-    mNumChannels(0),
-    mAudioRate(0),
-    mBytesPerSample(0)
-{
-  MOZ_ASSERT(NS_IsMainThread(), "Must be on main thread.");
-  MOZ_COUNT_CTOR(DirectShowReader);
-}
-
-DirectShowReader::~DirectShowReader()
-{
-  MOZ_ASSERT(NS_IsMainThread(), "Must be on main thread.");
-  MOZ_COUNT_DTOR(DirectShowReader);
-#ifdef DIRECTSHOW_REGISTER_GRAPH
-  if (mRotRegister) {
-    RemoveGraphFromRunningObjectTable(mRotRegister);
-  }
-#endif
-}
-
-// Try to parse the MP3 stream to make sure this is indeed an MP3, get the
-// estimated duration of the stream, and find the offset of the actual MP3
-// frames in the stream, as DirectShow doesn't like large ID3 sections.
-static nsresult
-ParseMP3Headers(MP3FrameParser *aParser, MediaResource *aResource)
-{
-  const uint32_t MAX_READ_SIZE = 4096;
-
-  uint64_t offset = 0;
-  while (aParser->NeedsData() && !aParser->ParsedHeaders()) {
-    uint32_t bytesRead;
-    char buffer[MAX_READ_SIZE];
-    nsresult rv = aResource->ReadAt(offset, buffer,
-                                    MAX_READ_SIZE, &bytesRead);
-    NS_ENSURE_SUCCESS(rv, rv);
-
-    if (!bytesRead) {
-      // End of stream.
-      return NS_ERROR_FAILURE;
-    }
-
-    aParser->Parse(reinterpret_cast<uint8_t*>(buffer), bytesRead, offset);
-    offset += bytesRead;
-  }
-
-  return aParser->IsMP3() ? NS_OK : NS_ERROR_FAILURE;
-}
-
-nsresult
-DirectShowReader::ReadMetadata(MediaInfo* aInfo,
-                               MetadataTags** aTags)
-{
-  MOZ_ASSERT(OnTaskQueue());
-  HRESULT hr;
-  nsresult rv;
-
-  // Create the filter graph, reference it by the GraphBuilder interface,
-  // to make graph building more convenient.
-  hr = CoCreateInstance(CLSID_FilterGraph,
-                        nullptr,
-                        CLSCTX_INPROC_SERVER,
-                        IID_IGraphBuilder,
-                        reinterpret_cast<void**>(static_cast<IGraphBuilder**>(getter_AddRefs(mGraph))));
-  NS_ENSURE_TRUE(SUCCEEDED(hr) && mGraph, NS_ERROR_FAILURE);
-
-  rv = ParseMP3Headers(&mMP3FrameParser, mDecoder->GetResource());
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  #ifdef DIRECTSHOW_REGISTER_GRAPH
-  hr = AddGraphToRunningObjectTable(mGraph, &mRotRegister);
-  NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-  #endif
-
-  // Extract the interface pointers we'll need from the filter graph.
-  hr = mGraph->QueryInterface(static_cast<IMediaControl**>(getter_AddRefs(mControl)));
-  NS_ENSURE_TRUE(SUCCEEDED(hr) && mControl, NS_ERROR_FAILURE);
-
-  hr = mGraph->QueryInterface(static_cast<IMediaSeeking**>(getter_AddRefs(mMediaSeeking)));
-  NS_ENSURE_TRUE(SUCCEEDED(hr) && mMediaSeeking, NS_ERROR_FAILURE);
-
-  // Build the graph. Create the filters we need, and connect them. We
-  // build the entire graph ourselves to prevent other decoders installed
-  // on the system being created and used.
-
-  // Our source filters, wraps the MediaResource.
-  mSourceFilter = new SourceFilter(MEDIATYPE_Stream, MEDIASUBTYPE_MPEG1Audio);
-  NS_ENSURE_TRUE(mSourceFilter, NS_ERROR_FAILURE);
-
-  rv = mSourceFilter->Init(mDecoder->GetResource(), mMP3FrameParser.GetMP3Offset());
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  hr = mGraph->AddFilter(mSourceFilter, L"MozillaDirectShowSource");
-  NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-
-  // The MPEG demuxer.
-  RefPtr<IBaseFilter> demuxer;
-  hr = CreateAndAddFilter(mGraph,
-                          CLSID_MPEG1Splitter,
-                          L"MPEG1Splitter",
-                          getter_AddRefs(demuxer));
-  NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-
-  // Platform MP3 decoder.
-  RefPtr<IBaseFilter> decoder;
-  // Firstly try to create the MP3 decoder filter that ships with WinXP
-  // directly. This filter doesn't normally exist on later versions of
-  // Windows.
-  hr = CreateAndAddFilter(mGraph,
-                          CLSID_MPEG_LAYER_3_DECODER_FILTER,
-                          L"MPEG Layer 3 Decoder",
-                          getter_AddRefs(decoder));
-  if (FAILED(hr)) {
-    // Failed to create MP3 decoder filter. Try to instantiate
-    // the MP3 decoder DMO.
-    hr = AddMP3DMOWrapperFilter(mGraph, getter_AddRefs(decoder));
-    NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-  }
-
-  // Sink, captures audio samples and inserts them into our pipeline.
-  static const wchar_t* AudioSinkFilterName = L"MozAudioSinkFilter";
-  mAudioSinkFilter = new AudioSinkFilter(AudioSinkFilterName, &hr);
-  NS_ENSURE_TRUE(mAudioSinkFilter && SUCCEEDED(hr), NS_ERROR_FAILURE);
-  hr = mGraph->AddFilter(mAudioSinkFilter, AudioSinkFilterName);
-  NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-
-  // Join the filters.
-  hr = ConnectFilters(mGraph, mSourceFilter, demuxer);
-  NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-
-  hr = ConnectFilters(mGraph, demuxer, decoder);
-  NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-
-  hr = ConnectFilters(mGraph, decoder, mAudioSinkFilter);
-  NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-
-  WAVEFORMATEX format;
-  mAudioSinkFilter->GetSampleSink()->GetAudioFormat(&format);
-  NS_ENSURE_TRUE(format.wFormatTag == WAVE_FORMAT_PCM, NS_ERROR_FAILURE);
-
-  mInfo.mAudio.mChannels = mNumChannels = format.nChannels;
-  mInfo.mAudio.mRate = mAudioRate = format.nSamplesPerSec;
-  mInfo.mAudio.mBitDepth = format.wBitsPerSample;
-  mBytesPerSample = format.wBitsPerSample / 8;
-
-  // Begin decoding!
-  hr = mControl->Run();
-  NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-
-  DWORD seekCaps = 0;
-  hr = mMediaSeeking->GetCapabilities(&seekCaps);
-  mInfo.mMediaSeekable = SUCCEEDED(hr) && (AM_SEEKING_CanSeekAbsolute & seekCaps);
-
-  int64_t duration = mMP3FrameParser.GetDuration();
-  if (SUCCEEDED(hr)) {
-    mInfo.mMetadataDuration.emplace(TimeUnit::FromMicroseconds(duration));
-  }
-
-  LOG("Successfully initialized DirectShow MP3 decoder.");
-  LOG("Channels=%u Hz=%u duration=%lld bytesPerSample=%d",
-      mInfo.mAudio.mChannels,
-      mInfo.mAudio.mRate,
-      RefTimeToUsecs(duration),
-      mBytesPerSample);
-
-  *aInfo = mInfo;
-  // Note: The SourceFilter strips ID3v2 tags out of the stream.
-  *aTags = nullptr;
-
-  return NS_OK;
-}
-
-inline float
-UnsignedByteToAudioSample(uint8_t aValue)
-{
-  return aValue * (2.0f / UINT8_MAX) - 1.0f;
-}
-
-bool
-DirectShowReader::Finish(HRESULT aStatus)
-{
-  MOZ_ASSERT(OnTaskQueue());
-
-  LOG("DirectShowReader::Finish(0x%x)", aStatus);
-  // Notify the filter graph of end of stream.
-  RefPtr<IMediaEventSink> eventSink;
-  HRESULT hr = mGraph->QueryInterface(static_cast<IMediaEventSink**>(getter_AddRefs(eventSink)));
-  if (SUCCEEDED(hr) && eventSink) {
-    eventSink->Notify(EC_COMPLETE, aStatus, 0);
-  }
-  return false;
-}
-
-class DirectShowCopy
-{
-public:
-  DirectShowCopy(uint8_t *aSource, uint32_t aBytesPerSample,
-                 uint32_t aSamples, uint32_t aChannels)
-    : mSource(aSource)
-    , mBytesPerSample(aBytesPerSample)
-    , mSamples(aSamples)
-    , mChannels(aChannels)
-    , mNextSample(0)
-  { }
-
-  uint32_t operator()(AudioDataValue *aBuffer, uint32_t aSamples)
-  {
-    uint32_t maxSamples = std::min(aSamples, mSamples - mNextSample);
-    uint32_t frames = maxSamples / mChannels;
-    size_t byteOffset = mNextSample * mBytesPerSample;
-    if (mBytesPerSample == 1) {
-      for (uint32_t i = 0; i < maxSamples; ++i) {
-        uint8_t *sample = mSource + byteOffset;
-        aBuffer[i] = UnsignedByteToAudioSample(*sample);
-        byteOffset += mBytesPerSample;
-      }
-    } else if (mBytesPerSample == 2) {
-      for (uint32_t i = 0; i < maxSamples; ++i) {
-        int16_t *sample = reinterpret_cast<int16_t *>(mSource + byteOffset);
-        aBuffer[i] = AudioSampleToFloat(*sample);
-        byteOffset += mBytesPerSample;
-      }
-    }
-    mNextSample += maxSamples;
-    return frames;
-  }
-
-private:
-  uint8_t * const mSource;
-  const uint32_t mBytesPerSample;
-  const uint32_t mSamples;
-  const uint32_t mChannels;
-  uint32_t mNextSample;
-};
-
-bool
-DirectShowReader::DecodeAudioData()
-{
-  MOZ_ASSERT(OnTaskQueue());
-  HRESULT hr;
-
-  SampleSink* sink = mAudioSinkFilter->GetSampleSink();
-  if (sink->AtEOS()) {
-    // End of stream.
-    return Finish(S_OK);
-  }
-
-  // Get the next chunk of audio samples. This blocks until the sample
-  // arrives, or an error occurs (like the stream is shutdown).
-  RefPtr<IMediaSample> sample;
-  hr = sink->Extract(sample);
-  if (FAILED(hr) || hr == S_FALSE) {
-    return Finish(hr);
-  }
-
-  int64_t start = 0, end = 0;
-  sample->GetMediaTime(&start, &end);
-  LOG("DirectShowReader::DecodeAudioData [%4.2lf-%4.2lf]",
-      RefTimeToSeconds(start),
-      RefTimeToSeconds(end));
-
-  LONG length = sample->GetActualDataLength();
-  LONG numSamples = length / mBytesPerSample;
-  LONG numFrames = length / mBytesPerSample / mNumChannels;
-
-  BYTE* data = nullptr;
-  hr = sample->GetPointer(&data);
-  NS_ENSURE_TRUE(SUCCEEDED(hr), Finish(hr));
-
-  mAudioCompactor.Push(mDecoder->GetResource()->Tell(),
-                       RefTimeToUsecs(start),
-                       mInfo.mAudio.mRate,
-                       numFrames,
-                       mNumChannels,
-                       DirectShowCopy(reinterpret_cast<uint8_t *>(data),
-                                      mBytesPerSample,
-                                      numSamples,
-                                      mNumChannels));
-  return true;
-}
-
-bool
-DirectShowReader::DecodeVideoFrame(bool &aKeyframeSkip,
-                                   int64_t aTimeThreshold)
-{
-  MOZ_ASSERT(OnTaskQueue());
-  return false;
-}
-
-RefPtr<MediaDecoderReader::SeekPromise>
-DirectShowReader::Seek(SeekTarget aTarget, int64_t aEndTime)
-{
-  nsresult res = SeekInternal(aTarget.GetTime().ToMicroseconds());
-  if (NS_FAILED(res)) {
-    return SeekPromise::CreateAndReject(res, __func__);
-  } else {
-    return SeekPromise::CreateAndResolve(aTarget.GetTime(), __func__);
-  }
-}
-
-nsresult
-DirectShowReader::SeekInternal(int64_t aTargetUs)
-{
-  HRESULT hr;
-  MOZ_ASSERT(OnTaskQueue());
-
-  LOG("DirectShowReader::Seek() target=%lld", aTargetUs);
-
-  hr = mControl->Pause();
-  NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-
-  nsresult rv = ResetDecode();
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  LONGLONG seekPosition = UsecsToRefTime(aTargetUs);
-  hr = mMediaSeeking->SetPositions(&seekPosition,
-                                   AM_SEEKING_AbsolutePositioning,
-                                   nullptr,
-                                   AM_SEEKING_NoPositioning);
-  NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-
-  hr = mControl->Run();
-  NS_ENSURE_TRUE(SUCCEEDED(hr), NS_ERROR_FAILURE);
-
-  return NS_OK;
-}
-
-} // namespace mozilla
diff --git a/dom/media/directshow/DirectShowReader.h b/dom/media/directshow/DirectShowReader.h
deleted file mode 100644
index e1326d416..000000000
--- a/dom/media/directshow/DirectShowReader.h
+++ /dev/null
@@ -1,110 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#if !defined(DirectShowReader_h_)
-#define DirectShowReader_h_
-
-#include "windows.h" // HRESULT, DWORD
-#include "MediaDecoderReader.h"
-#include "MediaResource.h"
-#include "mozilla/RefPtr.h"
-#include "MP3FrameParser.h"
-
-// Add the graph to the Running Object Table so that we can connect
-// to this graph with GraphEdit/GraphStudio. Note: on Vista and up you must
-// also regsvr32 proppage.dll from the Windows SDK.
-// See: http://msdn.microsoft.com/en-us/library/ms787252(VS.85).aspx
-// #define DIRECTSHOW_REGISTER_GRAPH
-
-struct IGraphBuilder;
-struct IMediaControl;
-struct IMediaSeeking;
-
-namespace mozilla {
-
-class AudioSinkFilter;
-class SourceFilter;
-
-// Decoder backend for decoding MP3 using DirectShow. DirectShow operates as
-// a filter graph. The basic design of the DirectShowReader is that we have
-// a SourceFilter that wraps the MediaResource that connects to the
-// MP3 decoder filter. The MP3 decoder filter "pulls" data as it requires it
-// downstream on its own thread. When the MP3 decoder has produced a block of
-// decoded samples, its thread calls downstream into our AudioSinkFilter,
-// passing the decoded buffer in. The AudioSinkFilter inserts the samples into
-// a SampleSink object. The SampleSink blocks the MP3 decoder's thread until
-// the decode thread calls DecodeAudioData(), whereupon the SampleSink
-// releases the decoded samples to the decode thread, and unblocks the MP3
-// decoder's thread. The MP3 decoder can then request more data from the
-// SourceFilter, and decode more data. If the decode thread calls
-// DecodeAudioData() and there's no decoded samples waiting to be extracted
-// in the SampleSink, the SampleSink blocks the decode thread until the MP3
-// decoder produces a decoded sample.
-class DirectShowReader : public MediaDecoderReader
-{
-public:
-  DirectShowReader(AbstractMediaDecoder* aDecoder);
-
-  virtual ~DirectShowReader();
-
-  bool DecodeAudioData() override;
-  bool DecodeVideoFrame(bool &aKeyframeSkip,
-                        int64_t aTimeThreshold) override;
-
-  nsresult ReadMetadata(MediaInfo* aInfo,
-                        MetadataTags** aTags) override;
-
-  RefPtr<SeekPromise>
-  Seek(SeekTarget aTarget, int64_t aEndTime) override;
-
-  static const GUID CLSID_MPEG_LAYER_3_DECODER_FILTER;
-
-private:
-  // Notifies the filter graph that playback is complete. aStatus is
-  // the code to send to the filter graph. Always returns false, so
-  // that we can just "return Finish()" from DecodeAudioData().
-  bool Finish(HRESULT aStatus);
-
-  nsresult SeekInternal(int64_t aTime);
-
-  // DirectShow filter graph, and associated playback and seeking
-  // control interfaces.
-  RefPtr<IGraphBuilder> mGraph;
-  RefPtr<IMediaControl> mControl;
-  RefPtr<IMediaSeeking> mMediaSeeking;
-
-  // Wraps the MediaResource, and feeds undecoded data into the filter graph.
-  RefPtr<SourceFilter> mSourceFilter;
-
-  // Sits at the end of the graph, removing decoded samples from the graph.
-  // The graph will block while this is blocked, i.e. it will pause decoding.
-  RefPtr<AudioSinkFilter> mAudioSinkFilter;
-
-  // Some MP3s are variable bitrate, so DirectShow's duration estimation
-  // can make its duration estimation based on the wrong bitrate. So we parse
-  // the MP3 frames to get a more accuate estimate of the duration.
-  MP3FrameParser mMP3FrameParser;
-
-#ifdef DIRECTSHOW_REGISTER_GRAPH
-  // Used to add/remove the filter graph to the Running Object Table. You can
-  // connect GraphEdit/GraphStudio to the graph to observe and/or debug its
-  // topology and state.
-  DWORD mRotRegister;
-#endif
-
-  // Number of channels in the audio stream.
-  uint32_t mNumChannels;
-
-  // Samples per second in the audio stream.
-  uint32_t mAudioRate;
-
-  // Number of bytes per sample. Can be either 1 or 2.
-  uint32_t mBytesPerSample;
-};
-
-} // namespace mozilla
-
-#endif
diff --git a/dom/media/directshow/DirectShowUtils.cpp b/dom/media/directshow/DirectShowUtils.cpp
deleted file mode 100644
index b2afa7528..000000000
--- a/dom/media/directshow/DirectShowUtils.cpp
+++ /dev/null
@@ -1,369 +0,0 @@
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "DirectShowUtils.h"
-#include "dmodshow.h"
-#include "wmcodecdsp.h"
-#include "dmoreg.h"
-#include "mozilla/ArrayUtils.h"
-#include "mozilla/RefPtr.h"
-#include "nsPrintfCString.h"
-
-#define WARN(...) NS_WARNING(nsPrintfCString(__VA_ARGS__).get())
-
-namespace mozilla {
-
-// Create a table which maps GUIDs to a string representation of the GUID.
-// This is useful for debugging purposes, for logging the GUIDs of media types.
-// This is only available when logging is enabled, i.e. not in release builds.
-struct GuidToName {
-  const char* name;
-  const GUID guid;
-};
-
-#pragma push_macro("OUR_GUID_ENTRY")
-#undef OUR_GUID_ENTRY
-#define OUR_GUID_ENTRY(name, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
-  { #name, {l, w1, w2, {b1, b2, b3, b4, b5, b6, b7, b8}} },
-
-static const GuidToName GuidToNameTable[] = {
-#include <uuids.h>
-};
-
-#pragma pop_macro("OUR_GUID_ENTRY")
-
-const char*
-GetDirectShowGuidName(const GUID& aGuid)
-{
-  const size_t len = ArrayLength(GuidToNameTable);
-  for (unsigned i = 0; i < len; i++) {
-    if (IsEqualGUID(aGuid, GuidToNameTable[i].guid)) {
-      return GuidToNameTable[i].name;
-    }
-  }
-  return "Unknown";
-}
-
-void
-RemoveGraphFromRunningObjectTable(DWORD aRotRegister)
-{
-  RefPtr<IRunningObjectTable> runningObjectTable;
-  if (SUCCEEDED(GetRunningObjectTable(0, getter_AddRefs(runningObjectTable)))) {
-    runningObjectTable->Revoke(aRotRegister);
-  }
-}
-
-HRESULT
-AddGraphToRunningObjectTable(IUnknown *aUnkGraph, DWORD *aOutRotRegister)
-{
-  HRESULT hr;
-
-  RefPtr<IMoniker> moniker;
-  RefPtr<IRunningObjectTable> runningObjectTable;
-
-  hr = GetRunningObjectTable(0, getter_AddRefs(runningObjectTable));
-  NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
-
-  const size_t STRING_LENGTH = 256;
-  WCHAR wsz[STRING_LENGTH];
-
-  StringCchPrintfW(wsz,
-                   STRING_LENGTH,
-                   L"FilterGraph %08x pid %08x",
-                   (DWORD_PTR)aUnkGraph,
-                   GetCurrentProcessId());
-
-  hr = CreateItemMoniker(L"!", wsz, getter_AddRefs(moniker));
-  NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
-
-  hr = runningObjectTable->Register(ROTFLAGS_REGISTRATIONKEEPSALIVE,
-                                    aUnkGraph,
-                                    moniker,
-                                    aOutRotRegister);
-  NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
-
-  return S_OK;
-}
-
-const char*
-GetGraphNotifyString(long evCode)
-{
-#define CASE(x) case x: return #x
-  switch(evCode) {
-    CASE(EC_ACTIVATE); // A video window is being activated or deactivated.
-    CASE(EC_BANDWIDTHCHANGE); // Not supported.
-    CASE(EC_BUFFERING_DATA); // The graph is buffering data, or has stopped buffering data.
-    CASE(EC_BUILT); // Send by the Video Control when a graph has been built. Not forwarded to applications.
-    CASE(EC_CLOCK_CHANGED); // The reference clock has changed.
-    CASE(EC_CLOCK_UNSET); // The clock provider was disconnected.
-    CASE(EC_CODECAPI_EVENT); // Sent by an encoder to signal an encoding event.
-    CASE(EC_COMPLETE); // All data from a particular stream has been rendered.
-    CASE(EC_CONTENTPROPERTY_CHANGED); // Not supported.
-    CASE(EC_DEVICE_LOST); // A Plug and Play device was removed or has become available again.
-    CASE(EC_DISPLAY_CHANGED); // The display mode has changed.
-    CASE(EC_END_OF_SEGMENT); // The end of a segment has been reached.
-    CASE(EC_EOS_SOON); // Not supported.
-    CASE(EC_ERROR_STILLPLAYING); // An asynchronous command to run the graph has failed.
-    CASE(EC_ERRORABORT); // An operation was aborted because of an error.
-    CASE(EC_ERRORABORTEX); // An operation was aborted because of an error.
-    CASE(EC_EXTDEVICE_MODE_CHANGE); // Not supported.
-    CASE(EC_FILE_CLOSED); // The source file was closed because of an unexpected event.
-    CASE(EC_FULLSCREEN_LOST); // The video renderer is switching out of full-screen mode.
-    CASE(EC_GRAPH_CHANGED); // The filter graph has changed.
-    CASE(EC_LENGTH_CHANGED); // The length of a source has changed.
-    CASE(EC_LOADSTATUS); // Notifies the application of progress when opening a network file.
-    CASE(EC_MARKER_HIT); // Not supported.
-    CASE(EC_NEED_RESTART); // A filter is requesting that the graph be restarted.
-    CASE(EC_NEW_PIN); // Not supported.
-    CASE(EC_NOTIFY_WINDOW); // Notifies a filter of the video renderer's window.
-    CASE(EC_OLE_EVENT); // A filter is passing a text string to the application.
-    CASE(EC_OPENING_FILE); // The graph is opening a file, or has finished opening a file.
-    CASE(EC_PALETTE_CHANGED); // The video palette has changed.
-    CASE(EC_PAUSED); // A pause request has completed.
-    CASE(EC_PLEASE_REOPEN); // The source file has changed.
-    CASE(EC_PREPROCESS_COMPLETE); // Sent by the WM ASF Writer filter when it completes the pre-processing for multipass encoding.
-    CASE(EC_PROCESSING_LATENCY); // Indicates the amount of time that a component is taking to process each sample.
-    CASE(EC_QUALITY_CHANGE); // The graph is dropping samples, for quality control.
-    //CASE(EC_RENDER_FINISHED); // Not supported.
-    CASE(EC_REPAINT); // A video renderer requires a repaint.
-    CASE(EC_SAMPLE_LATENCY); // Specifies how far behind schedule a component is for processing samples.
-    //CASE(EC_SAMPLE_NEEDED); // Requests a new input sample from the Enhanced Video Renderer (EVR) filter.
-    CASE(EC_SCRUB_TIME); // Specifies the time stamp for the most recent frame step.
-    CASE(EC_SEGMENT_STARTED); // A new segment has started.
-    CASE(EC_SHUTTING_DOWN); // The filter graph is shutting down, prior to being destroyed.
-    CASE(EC_SNDDEV_IN_ERROR); // A device error has occurred in an audio capture filter.
-    CASE(EC_SNDDEV_OUT_ERROR); // A device error has occurred in an audio renderer filter.
-    CASE(EC_STARVATION); // A filter is not receiving enough data.
-    CASE(EC_STATE_CHANGE); // The filter graph has changed state.
-    CASE(EC_STATUS); // Contains two arbitrary status strings.
-    CASE(EC_STEP_COMPLETE); // A filter performing frame stepping has stepped the specified number of frames.
-    CASE(EC_STREAM_CONTROL_STARTED); // A stream-control start command has taken effect.
-    CASE(EC_STREAM_CONTROL_STOPPED); // A stream-control stop command has taken effect.
-    CASE(EC_STREAM_ERROR_STILLPLAYING); // An error has occurred in a stream. The stream is still playing.
-    CASE(EC_STREAM_ERROR_STOPPED); // A stream has stopped because of an error.
-    CASE(EC_TIMECODE_AVAILABLE); // Not supported.
-    CASE(EC_UNBUILT); // Send by the Video Control when a graph has been torn down. Not forwarded to applications.
-    CASE(EC_USERABORT); // The user has terminated playback.
-    CASE(EC_VIDEO_SIZE_CHANGED); // The native video size has changed.
-    CASE(EC_VIDEOFRAMEREADY); // A video frame is ready for display.
-    CASE(EC_VMR_RECONNECTION_FAILED); // Sent by the VMR-7 and the VMR-9 when it was unable to accept a dynamic format change request from the upstream decoder.
-    CASE(EC_VMR_RENDERDEVICE_SET); // Sent when the VMR has selected its rendering mechanism.
-    CASE(EC_VMR_SURFACE_FLIPPED); // Sent when the VMR-7's allocator presenter has called the DirectDraw Flip method on the surface being presented.
-    CASE(EC_WINDOW_DESTROYED); // The video renderer was destroyed or removed from the graph.
-    CASE(EC_WMT_EVENT); // Sent by the WM ASF Reader filter when it reads ASF files protected by digital rights management (DRM).
-    CASE(EC_WMT_INDEX_EVENT); // Sent when an application uses the WM ASF Writer to index Windows Media Video files.
-    CASE(S_OK); // Success.
-    CASE(VFW_S_AUDIO_NOT_RENDERED); // Partial success; the audio was not rendered.
-    CASE(VFW_S_DUPLICATE_NAME); // Success; the Filter Graph Manager modified a filter name to avoid duplication.
-    CASE(VFW_S_PARTIAL_RENDER); // Partial success; some of the streams in this movie are in an unsupported format.
-    CASE(VFW_S_VIDEO_NOT_RENDERED); // Partial success; the video was not rendered.
-    CASE(E_ABORT); // Operation aborted.
-    CASE(E_OUTOFMEMORY); // Insufficient memory.
-    CASE(E_POINTER); // Null pointer argument.
-    CASE(VFW_E_CANNOT_CONNECT); // No combination of intermediate filters could be found to make the connection.
-    CASE(VFW_E_CANNOT_RENDER); // No combination of filters could be found to render the stream.
-    CASE(VFW_E_NO_ACCEPTABLE_TYPES); // There is no common media type between these pins.
-    CASE(VFW_E_NOT_IN_GRAPH);
-
-    default:
-      return "Unknown Code";
-  };
-#undef CASE
-}
-
-HRESULT
-CreateAndAddFilter(IGraphBuilder* aGraph,
-                   REFGUID aFilterClsId,
-                   LPCWSTR aFilterName,
-                   IBaseFilter **aOutFilter)
-{
-  NS_ENSURE_TRUE(aGraph, E_POINTER);
-  NS_ENSURE_TRUE(aOutFilter, E_POINTER);
-  HRESULT hr;
-
-  RefPtr<IBaseFilter> filter;
-  hr = CoCreateInstance(aFilterClsId,
-                        nullptr,
-                        CLSCTX_INPROC_SERVER,
-                        IID_IBaseFilter,
-                        getter_AddRefs(filter));
-  if (FAILED(hr)) {
-    // Object probably not available on this system.
-    WARN("CoCreateInstance failed, hr=%x", hr);
-    return hr;
-  }
-
-  hr = aGraph->AddFilter(filter, aFilterName);
-  if (FAILED(hr)) {
-    WARN("AddFilter failed, hr=%x", hr);
-    return hr;
-  }
-
-  filter.forget(aOutFilter);
-
-  return S_OK;
-}
-
-HRESULT
-CreateMP3DMOWrapperFilter(IBaseFilter **aOutFilter)
-{
-  NS_ENSURE_TRUE(aOutFilter, E_POINTER);
-  HRESULT hr;
-
-  // Create the wrapper filter.
-  RefPtr<IBaseFilter> filter;
-  hr = CoCreateInstance(CLSID_DMOWrapperFilter,
-                        nullptr,
-                        CLSCTX_INPROC_SERVER,
-                        IID_IBaseFilter,
-                        getter_AddRefs(filter));
-  if (FAILED(hr)) {
-    WARN("CoCreateInstance failed, hr=%x", hr);
-    return hr;
-  }
-
-  // Query for IDMOWrapperFilter.
-  RefPtr<IDMOWrapperFilter> dmoWrapper;
-  hr = filter->QueryInterface(IID_IDMOWrapperFilter,
-                              getter_AddRefs(dmoWrapper));
-  if (FAILED(hr)) {
-    WARN("QueryInterface failed, hr=%x", hr);
-    return hr;
-  }
-
-  hr = dmoWrapper->Init(CLSID_CMP3DecMediaObject, DMOCATEGORY_AUDIO_DECODER);
-  if (FAILED(hr)) {
-    // Can't instantiate MP3 DMO. It doesn't exist on Windows XP, we're
-    // probably hitting that. Don't log warning to console, this is an
-    // expected error.
-    WARN("dmoWrapper Init failed, hr=%x", hr);
-    return hr;
-  }
-
-  filter.forget(aOutFilter);
-
-  return S_OK;
-}
-
-HRESULT
-AddMP3DMOWrapperFilter(IGraphBuilder* aGraph,
-                       IBaseFilter **aOutFilter)
-{
-  NS_ENSURE_TRUE(aGraph, E_POINTER);
-  NS_ENSURE_TRUE(aOutFilter, E_POINTER);
-  HRESULT hr;
-
-  // Create the wrapper filter.
-  RefPtr<IBaseFilter> filter;
-  hr = CreateMP3DMOWrapperFilter(getter_AddRefs(filter));
-  NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
-
-  // Add the wrapper filter to graph.
-  hr = aGraph->AddFilter(filter, L"MP3 Decoder DMO");
-  if (FAILED(hr)) {
-    WARN("AddFilter failed, hr=%x", hr);
-    return hr;
-  }
-
-  filter.forget(aOutFilter);
-
-  return S_OK;
-}
-
-bool
-CanDecodeMP3UsingDirectShow()
-{
-  RefPtr<IBaseFilter> filter;
-
-  // Can we create the MP3 demuxer filter?
-  if (FAILED(CoCreateInstance(CLSID_MPEG1Splitter,
-                              nullptr,
-                              CLSCTX_INPROC_SERVER,
-                              IID_IBaseFilter,
-                              getter_AddRefs(filter)))) {
-    return false;
-  }
-
-  // Can we create either the WinXP MP3 decoder filter or the MP3 DMO decoder?
-  if (FAILED(CoCreateInstance(DirectShowReader::CLSID_MPEG_LAYER_3_DECODER_FILTER,
-                              nullptr,
-                              CLSCTX_INPROC_SERVER,
-                              IID_IBaseFilter,
-                              getter_AddRefs(filter))) &&
-      FAILED(CreateMP3DMOWrapperFilter(getter_AddRefs(filter)))) {
-    return false;
-  }
-
-  // Else, we can create all of the components we need. Assume
-  // DirectShow is going to work...
-  return true;
-}
-
-// Match a pin by pin direction and connection state.
-HRESULT
-MatchUnconnectedPin(IPin* aPin,
-                    PIN_DIRECTION aPinDir,
-                    bool *aOutMatches)
-{
-  NS_ENSURE_TRUE(aPin, E_POINTER);
-  NS_ENSURE_TRUE(aOutMatches, E_POINTER);
-
-  // Ensure the pin is unconnected.
-  RefPtr<IPin> peer;
-  HRESULT hr = aPin->ConnectedTo(getter_AddRefs(peer));
-  if (hr != VFW_E_NOT_CONNECTED) {
-    *aOutMatches = false;
-    return hr;
-  }
-
-  // Ensure the pin is of the specified direction.
-  PIN_DIRECTION pinDir;
-  hr = aPin->QueryDirection(&pinDir);
-  NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
-
-  *aOutMatches = (pinDir == aPinDir);
-  return S_OK;
-}
-
-// Return the first unconnected input pin or output pin.
-already_AddRefed<IPin>
-GetUnconnectedPin(IBaseFilter* aFilter, PIN_DIRECTION aPinDir)
-{
-  RefPtr<IEnumPins> enumPins;
-
-  HRESULT hr = aFilter->EnumPins(getter_AddRefs(enumPins));
-  NS_ENSURE_TRUE(SUCCEEDED(hr), nullptr);
-
-  // Test each pin to see if it matches the direction we're looking for.
-  RefPtr<IPin> pin;
-  while (S_OK == enumPins->Next(1, getter_AddRefs(pin), nullptr)) {
-    bool matches = FALSE;
-    if (SUCCEEDED(MatchUnconnectedPin(pin, aPinDir, &matches)) &&
-        matches) {
-      return pin.forget();
-    }
-  }
-
-  return nullptr;
-}
-
-HRESULT
-ConnectFilters(IGraphBuilder* aGraph,
-               IBaseFilter* aOutputFilter,
-               IBaseFilter* aInputFilter)
-{
-  RefPtr<IPin> output = GetUnconnectedPin(aOutputFilter, PINDIR_OUTPUT);
-  NS_ENSURE_TRUE(output, E_FAIL);
-
-  RefPtr<IPin> input = GetUnconnectedPin(aInputFilter, PINDIR_INPUT);
-  NS_ENSURE_TRUE(output, E_FAIL);
-
-  return aGraph->Connect(output, input);
-}
-
-} // namespace mozilla
-
-// avoid redefined macro in unified build
-#undef WARN
diff --git a/dom/media/directshow/DirectShowUtils.h b/dom/media/directshow/DirectShowUtils.h
deleted file mode 100644
index 3bbc122fc..000000000
--- a/dom/media/directshow/DirectShowUtils.h
+++ /dev/null
@@ -1,125 +0,0 @@
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef _DirectShowUtils_h_
-#define _DirectShowUtils_h_
-
-#include <stdint.h>
-#include "dshow.h"
-
-// XXXbz windowsx.h defines GetFirstChild, GetNextSibling,
-// GetPrevSibling are macros, apparently... Eeevil.  We have functions
-// called that on some classes, so undef them.
-#undef GetFirstChild
-#undef GetNextSibling
-#undef GetPrevSibling
-
-#include "DShowTools.h"
-#include "mozilla/Logging.h"
-
-namespace mozilla {
-
-// Win32 "Event" wrapper. Must be paired with a CriticalSection to create a
-// Java-style "monitor".
-class Signal {
-public:
-
-  Signal(CriticalSection* aLock)
-    : mLock(aLock)
-  {
-    CriticalSectionAutoEnter lock(*mLock);
-    mEvent = CreateEvent(nullptr, FALSE, FALSE, nullptr);
-  }
-
-  ~Signal() {
-    CriticalSectionAutoEnter lock(*mLock);
-    CloseHandle(mEvent);
-  }
-
-  // Lock must be held.
-  void Notify() {
-    SetEvent(mEvent);
-  }
-
-  // Lock must be held. Check the wait condition before waiting!
-  HRESULT Wait() {
-    mLock->Leave();
-    DWORD result = WaitForSingleObject(mEvent, INFINITE);
-    mLock->Enter();
-    return result == WAIT_OBJECT_0 ? S_OK : E_FAIL;
-  }
-
-private:
-  CriticalSection* mLock;
-  HANDLE mEvent;
-};
-
-HRESULT
-AddGraphToRunningObjectTable(IUnknown *aUnkGraph, DWORD *aOutRotRegister);
-
-void
-RemoveGraphFromRunningObjectTable(DWORD aRotRegister);
-
-const char*
-GetGraphNotifyString(long evCode);
-
-// Creates a filter and adds it to a graph.
-HRESULT
-CreateAndAddFilter(IGraphBuilder* aGraph,
-                   REFGUID aFilterClsId,
-                   LPCWSTR aFilterName,
-                   IBaseFilter **aOutFilter);
-
-HRESULT
-AddMP3DMOWrapperFilter(IGraphBuilder* aGraph,
-                       IBaseFilter **aOutFilter);
-
-// Connects the output pin on aOutputFilter to an input pin on
-// aInputFilter, in aGraph.
-HRESULT
-ConnectFilters(IGraphBuilder* aGraph,
-               IBaseFilter* aOutputFilter,
-               IBaseFilter* aInputFilter);
-
-HRESULT
-MatchUnconnectedPin(IPin* aPin,
-                    PIN_DIRECTION aPinDir,
-                    bool *aOutMatches);
-
-// Converts from microseconds to DirectShow "Reference Time"
-// (hundreds of nanoseconds).
-inline int64_t
-UsecsToRefTime(const int64_t aUsecs)
-{
-  return aUsecs * 10;
-}
-
-// Converts from DirectShow "Reference Time" (hundreds of nanoseconds)
-// to microseconds.
-inline int64_t
-RefTimeToUsecs(const int64_t hRefTime)
-{
-  return hRefTime / 10;
-}
-
-// Converts from DirectShow "Reference Time" (hundreds of nanoseconds)
-// to seconds.
-inline double
-RefTimeToSeconds(const REFERENCE_TIME aRefTime)
-{
-  return double(aRefTime) / 10000000;
-}
-
-const char*
-GetDirectShowGuidName(const GUID& aGuid);
-
-// Returns true if we can instantiate an MP3 demuxer and decoder filters.
-// Use this to detect whether MP3 support is installed.
-bool
-CanDecodeMP3UsingDirectShow();
-
-} // namespace mozilla
-
-#endif
diff --git a/dom/media/directshow/SampleSink.cpp b/dom/media/directshow/SampleSink.cpp
deleted file mode 100644
index fa5dc8d19..000000000
--- a/dom/media/directshow/SampleSink.cpp
+++ /dev/null
@@ -1,159 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "SampleSink.h"
-#include "AudioSinkFilter.h"
-#include "AudioSinkInputPin.h"
-#include "VideoUtils.h"
-#include "mozilla/Logging.h"
-
-using namespace mozilla::media;
-
-namespace mozilla {
-
-static LazyLogModule gDirectShowLog("DirectShowDecoder");
-#define LOG(...) MOZ_LOG(gDirectShowLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
-
-SampleSink::SampleSink()
-  : mMonitor("SampleSink"),
-    mIsFlushing(false),
-    mAtEOS(false)
-{
-  MOZ_COUNT_CTOR(SampleSink);
-}
-
-SampleSink::~SampleSink()
-{
-  MOZ_COUNT_DTOR(SampleSink);
-}
-
-void
-SampleSink::SetAudioFormat(const WAVEFORMATEX* aInFormat)
-{
-  NS_ENSURE_TRUE(aInFormat, );
-  ReentrantMonitorAutoEnter mon(mMonitor);
-  memcpy(&mAudioFormat, aInFormat, sizeof(WAVEFORMATEX));
-}
-
-void
-SampleSink::GetAudioFormat(WAVEFORMATEX* aOutFormat)
-{
-  MOZ_ASSERT(aOutFormat);
-  ReentrantMonitorAutoEnter mon(mMonitor);
-  memcpy(aOutFormat, &mAudioFormat, sizeof(WAVEFORMATEX));
-}
-
-HRESULT
-SampleSink::Receive(IMediaSample* aSample)
-{
-  ReentrantMonitorAutoEnter mon(mMonitor);
-
-  while (true) {
-    if (mIsFlushing) {
-      return S_FALSE;
-    }
-    if (!mSample) {
-      break;
-    }
-    if (mAtEOS) {
-      return E_UNEXPECTED;
-    }
-    // Wait until the consumer thread consumes the sample.
-    mon.Wait();
-  }
-
-  if (MOZ_LOG_TEST(gDirectShowLog, LogLevel::Debug)) {
-    REFERENCE_TIME start = 0, end = 0;
-    HRESULT hr = aSample->GetMediaTime(&start, &end);
-    LOG("SampleSink::Receive() [%4.2lf-%4.2lf]",
-        (double)RefTimeToUsecs(start) / USECS_PER_S,
-        (double)RefTimeToUsecs(end) / USECS_PER_S);
-  }
-
-  mSample = aSample;
-  // Notify the signal, to awaken the consumer thread in WaitForSample()
-  // if necessary.
-  mon.NotifyAll();
-  return S_OK;
-}
-
-HRESULT
-SampleSink::Extract(RefPtr<IMediaSample>& aOutSample)
-{
-  ReentrantMonitorAutoEnter mon(mMonitor);
-  // Loop until we have a sample, or we should abort.
-  while (true) {
-    if (mIsFlushing) {
-      return S_FALSE;
-    }
-    if (mSample) {
-      break;
-    }
-    if (mAtEOS) {
-      // Order is important here, if we have a sample, we should return it
-      // before reporting EOS.
-      return E_UNEXPECTED;
-    }
-    // Wait until the producer thread gives us a sample.
-    mon.Wait();
-  }
-  aOutSample = mSample;
-
-  if (MOZ_LOG_TEST(gDirectShowLog, LogLevel::Debug)) {
-    int64_t start = 0, end = 0;
-    mSample->GetMediaTime(&start, &end);
-    LOG("SampleSink::Extract() [%4.2lf-%4.2lf]",
-        (double)RefTimeToUsecs(start) / USECS_PER_S,
-        (double)RefTimeToUsecs(end) / USECS_PER_S);
-  }
-
-  mSample = nullptr;
-  // Notify the signal, to awaken the producer thread in Receive()
-  // if necessary.
-  mon.NotifyAll();
-  return S_OK;
-}
-
-void
-SampleSink::Flush()
-{
-  LOG("SampleSink::Flush()");
-  ReentrantMonitorAutoEnter mon(mMonitor);
-  mIsFlushing = true;
-  mSample = nullptr;
-  mon.NotifyAll();
-}
-
-void
-SampleSink::Reset()
-{
-  LOG("SampleSink::Reset()");
-  ReentrantMonitorAutoEnter mon(mMonitor);
-  mIsFlushing = false;
-  mAtEOS = false;
-}
-
-void
-SampleSink::SetEOS()
-{
-  LOG("SampleSink::SetEOS()");
-  ReentrantMonitorAutoEnter mon(mMonitor);
-  mAtEOS = true;
-  // Notify to unblock any threads waiting for samples in
-  // Extract() or Receive(). Now that we're at EOS, no more samples
-  // will come!
-  mon.NotifyAll();
-}
-
-bool
-SampleSink::AtEOS()
-{
-  ReentrantMonitorAutoEnter mon(mMonitor);
-  return mAtEOS && !mSample;
-}
-
-} // namespace mozilla
-
diff --git a/dom/media/directshow/SampleSink.h b/dom/media/directshow/SampleSink.h
deleted file mode 100644
index 6a1af9fee..000000000
--- a/dom/media/directshow/SampleSink.h
+++ /dev/null
@@ -1,67 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#if !defined(SampleSink_h_)
-#define SampleSink_h_
-
-#include "BaseFilter.h"
-#include "DirectShowUtils.h"
-#include "mozilla/RefPtr.h"
-#include "mozilla/ReentrantMonitor.h"
-
-namespace mozilla {
-
-class SampleSink {
-public:
-  SampleSink();
-  virtual ~SampleSink();
-
-  // Sets the audio format of the incoming samples. The upstream filter
-  // calls this. This makes a copy.
-  void SetAudioFormat(const WAVEFORMATEX* aInFormat);
-
-  // Copies the format of incoming audio samples into into *aOutFormat.
-  void GetAudioFormat(WAVEFORMATEX* aOutFormat);
-
-  // Called when a sample is delivered by the DirectShow graph to the sink.
-  // The decode thread retrieves the sample by calling WaitForSample().
-  // Blocks if there's already a sample waiting to be consumed by the decode
-  // thread.
-  HRESULT Receive(IMediaSample* aSample);
-
-  // Retrieves a sample from the sample queue, blocking until one becomes
-  // available, or until an error occurs. Returns S_FALSE on EOS.
-  HRESULT Extract(RefPtr<IMediaSample>& aOutSample);
-
-  // Unblocks any threads waiting in GetSample().
-  // Clears mSample, which unblocks upstream stream.
-  void Flush();
-
-  // Opens up the sink to receive more samples in PutSample().
-  // Clears EOS flag.
-  void Reset();
-
-  // Marks that we've reacehd the end of stream.
-  void SetEOS();
-
-  // Returns whether we're at end of stream.
-  bool AtEOS();
-
-private:
-  // All data in this class is syncronized by mMonitor.
-  ReentrantMonitor mMonitor;
-  RefPtr<IMediaSample> mSample;
-
-  // Format of the audio stream we're receiving.
-  WAVEFORMATEX mAudioFormat;
-
-  bool mIsFlushing;
-  bool mAtEOS;
-};
-
-} // namespace mozilla
-
-#endif // SampleSink_h_
diff --git a/dom/media/directshow/SourceFilter.cpp b/dom/media/directshow/SourceFilter.cpp
deleted file mode 100644
index 4c5a0882c..000000000
--- a/dom/media/directshow/SourceFilter.cpp
+++ /dev/null
@@ -1,683 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "SourceFilter.h"
-#include "MediaResource.h"
-#include "mozilla/RefPtr.h"
-#include "DirectShowUtils.h"
-#include "MP3FrameParser.h"
-#include "mozilla/Logging.h"
-#include <algorithm>
-
-using namespace mozilla::media;
-
-namespace mozilla {
-
-// Define to trace what's on...
-//#define DEBUG_SOURCE_TRACE 1
-
-#if defined (DEBUG_SOURCE_TRACE)
-static LazyLogModule gDirectShowLog("DirectShowDecoder");
-#define DIRECTSHOW_LOG(...) MOZ_LOG(gDirectShowLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
-#else
-#define DIRECTSHOW_LOG(...)
-#endif
-
-static HRESULT
-DoGetInterface(IUnknown* aUnknown, void** aInterface)
-{
-  if (!aInterface)
-    return E_POINTER;
-  *aInterface = aUnknown;
-  aUnknown->AddRef();
-  return S_OK;
-}
-
-// Stores details of IAsyncReader::Request().
-class ReadRequest {
-public:
-
-  ReadRequest(IMediaSample* aSample,
-              DWORD_PTR aDwUser,
-              uint32_t aOffset,
-              uint32_t aCount)
-    : mSample(aSample),
-      mDwUser(aDwUser),
-      mOffset(aOffset),
-      mCount(aCount)
-  {
-    MOZ_COUNT_CTOR(ReadRequest);
-  }
-
-  ~ReadRequest() {
-    MOZ_COUNT_DTOR(ReadRequest);
-  }
-
-  RefPtr<IMediaSample> mSample;
-  DWORD_PTR mDwUser;
-  uint32_t mOffset;
-  uint32_t mCount;
-};
-
-// A wrapper around media resource that presents only a partition of the
-// underlying resource to the caller to use. The partition returned is from
-// an offset to the end of stream, and this object deals with ensuring
-// the offsets and lengths etc are translated from the reduced partition
-// exposed to the caller, to the absolute offsets of the underlying stream.
-class MediaResourcePartition {
-public:
-  MediaResourcePartition(MediaResource* aResource,
-                         int64_t aDataStart)
-    : mResource(aResource),
-      mDataOffset(aDataStart)
-  {}
-
-  int64_t GetLength() {
-    int64_t len = mResource.GetLength();
-    if (len == -1) {
-      return len;
-    }
-    return std::max<int64_t>(0, len - mDataOffset);
-  }
-  nsresult ReadAt(int64_t aOffset, char* aBuffer,
-                  uint32_t aCount, uint32_t* aBytes)
-  {
-    return mResource.ReadAt(aOffset + mDataOffset,
-                            aBuffer,
-                            aCount,
-                            aBytes);
-  }
-  int64_t GetCachedDataEnd() {
-    int64_t tell = mResource.GetResource()->Tell();
-    int64_t dataEnd =
-      mResource.GetResource()->GetCachedDataEnd(tell) - mDataOffset;
-    return dataEnd;
-  }
-private:
-  // MediaResource from which we read data.
-  MediaResourceIndex mResource;
-  int64_t mDataOffset;
-};
-
-
-// Output pin for SourceFilter, which implements IAsyncReader, to
-// allow downstream filters to pull/read data from it. Downstream pins
-// register to read data using Request(), and asynchronously wait for the
-// reads to complete using WaitForNext(). They may also synchronously read
-// using SyncRead(). This class is a delegate (tear off) of
-// SourceFilter.
-//
-// We can expose only a segment of the MediaResource to the filter graph.
-// This is used to strip off the ID3v2 tags from the stream, as DirectShow
-// has trouble parsing some headers.
-//
-// Implements:
-//  * IAsyncReader
-//  * IPin
-//  * IQualityControl
-//  * IUnknown
-//
-class DECLSPEC_UUID("18e5cfb2-1015-440c-a65c-e63853235894")
-OutputPin : public IAsyncReader,
-            public BasePin
-{
-public:
-
-  OutputPin(MediaResource* aMediaResource,
-            SourceFilter* aParent,
-            CriticalSection& aFilterLock,
-            int64_t aMP3DataStart);
-  virtual ~OutputPin();
-
-  // IUnknown
-  // Defer to ref counting to BasePin, which defers to owning nsBaseFilter.
-  STDMETHODIMP_(ULONG) AddRef() override { return BasePin::AddRef(); }
-  STDMETHODIMP_(ULONG) Release() override { return BasePin::Release(); }
-  STDMETHODIMP QueryInterface(REFIID iid, void** ppv) override;
-
-  // BasePin Overrides.
-  // Determines if the pin accepts a specific media type.
-  HRESULT CheckMediaType(const MediaType* aMediaType) override;
-
-  // Retrieves a preferred media type, by index value.
-  HRESULT GetMediaType(int aPosition, MediaType* aMediaType) override;
-
-  // Releases the pin from a connection.
-  HRESULT BreakConnect(void) override;
-
-  // Determines whether a pin connection is suitable.
-  HRESULT CheckConnect(IPin* aPin) override;
-
-
-  // IAsyncReader overrides
-
-  // The RequestAllocator method requests an allocator during the
-  // pin connection.
-  STDMETHODIMP RequestAllocator(IMemAllocator* aPreferred,
-                                ALLOCATOR_PROPERTIES* aProps,
-                                IMemAllocator** aActual) override;
-
-  // The Request method queues an asynchronous request for data. Downstream
-  // will call WaitForNext() when they want to retrieve the result.
-  STDMETHODIMP Request(IMediaSample* aSample, DWORD_PTR aUserData) override;
-
-  // The WaitForNext method waits for the next pending read request
-  // to complete. This method fails if the graph is flushing.
-  // Defers to SyncRead/5.
-  STDMETHODIMP WaitForNext(DWORD aTimeout,
-                           IMediaSample** aSamples,
-                           DWORD_PTR* aUserData) override;
-
-  // The SyncReadAligned method performs a synchronous read. The method
-  // blocks until the request is completed. Defers to SyncRead/5. This
-  // method does not fail if the graph is flushing.
-  STDMETHODIMP SyncReadAligned(IMediaSample* aSample) override;
-
-  // The SyncRead method performs a synchronous read. The method blocks
-  // until the request is completed. Defers to SyncRead/5. This
-  // method does not fail if the graph is flushing.
-  STDMETHODIMP SyncRead(LONGLONG aPosition, LONG aLength, BYTE* aBuffer) override;
-
-  // The Length method retrieves the total length of the stream.
-  STDMETHODIMP Length(LONGLONG* aTotal, LONGLONG* aAvailable) override;
-
-  // IPin Overrides
-  STDMETHODIMP BeginFlush(void) override;
-  STDMETHODIMP EndFlush(void) override;
-
-  uint32_t GetAndResetBytesConsumedCount();
-
-private:
-
-  // Protects thread-shared data/structures (mFlushCount, mPendingReads).
-  // WaitForNext() also waits on this monitor
-  CriticalSection& mPinLock;
-
-  // Signal used with mPinLock to implement WaitForNext().
-  Signal mSignal;
-
-  // The filter that owns us. Weak reference, as we're a delegate (tear off).
-  SourceFilter* mParentSource;
-
-  MediaResourcePartition mResource;
-
-  // Counter, inc'd in BeginFlush(), dec'd in EndFlush(). Calls to this can
-  // come from multiple threads and can interleave, hence the counter.
-  int32_t mFlushCount;
-
-  // Number of bytes that have been read from the output pin since the last
-  // time GetAndResetBytesConsumedCount() was called.
-  uint32_t mBytesConsumed;
-
-  // Deque of ReadRequest* for reads that are yet to be serviced.
-  // nsReadRequest's are stored on the heap, popper must delete them.
-  nsDeque mPendingReads;
-
-  // Flags if the downstream pin has QI'd for IAsyncReader. We refuse
-  // connection if they don't query, as it means they're assuming that we're
-  // a push filter, and we're not.
-  bool mQueriedForAsyncReader;
-
-};
-
-// For mingw __uuidof support
-#ifdef __CRT_UUID_DECL
-}
-__CRT_UUID_DECL(mozilla::OutputPin, 0x18e5cfb2,0x1015,0x440c,0xa6,0x5c,0xe6,0x38,0x53,0x23,0x58,0x94);
-namespace mozilla {
-#endif
-
-OutputPin::OutputPin(MediaResource* aResource,
-                     SourceFilter* aParent,
-                     CriticalSection& aFilterLock,
-                     int64_t aMP3DataStart)
-  : BasePin(static_cast<BaseFilter*>(aParent),
-            &aFilterLock,
-            L"MozillaOutputPin",
-            PINDIR_OUTPUT),
-    mPinLock(aFilterLock),
-    mSignal(&mPinLock),
-    mParentSource(aParent),
-    mResource(aResource, aMP3DataStart),
-    mFlushCount(0),
-    mBytesConsumed(0),
-    mQueriedForAsyncReader(false)
-{
-  MOZ_COUNT_CTOR(OutputPin);
-  DIRECTSHOW_LOG("OutputPin::OutputPin()");
-}
-
-OutputPin::~OutputPin()
-{
-  MOZ_COUNT_DTOR(OutputPin);
-  DIRECTSHOW_LOG("OutputPin::~OutputPin()");
-}
-
-HRESULT
-OutputPin::BreakConnect()
-{
-  mQueriedForAsyncReader = false;
-  return BasePin::BreakConnect();
-}
-
-STDMETHODIMP
-OutputPin::QueryInterface(REFIID aIId, void** aInterface)
-{
-  if (aIId == IID_IAsyncReader) {
-    mQueriedForAsyncReader = true;
-    return DoGetInterface(static_cast<IAsyncReader*>(this), aInterface);
-  }
-
-  if (aIId == __uuidof(OutputPin)) {
-    AddRef();
-    *aInterface = this;
-    return S_OK;
-  }
-
-  return BasePin::QueryInterface(aIId, aInterface);
-}
-
-HRESULT
-OutputPin::CheckConnect(IPin* aPin)
-{
-  // Our connection is only suitable if the downstream pin knows
-  // that we're asynchronous (i.e. it queried for IAsyncReader).
-  return mQueriedForAsyncReader ? S_OK : S_FALSE;
-}
-
-HRESULT
-OutputPin::CheckMediaType(const MediaType* aMediaType)
-{
-  const MediaType *myMediaType = mParentSource->GetMediaType();
-
-  if (IsEqualGUID(aMediaType->majortype, myMediaType->majortype) &&
-      IsEqualGUID(aMediaType->subtype, myMediaType->subtype) &&
-      IsEqualGUID(aMediaType->formattype, myMediaType->formattype))
-  {
-    DIRECTSHOW_LOG("OutputPin::CheckMediaType() Match: major=%s minor=%s TC=%d FSS=%d SS=%u",
-                   GetDirectShowGuidName(aMediaType->majortype),
-                   GetDirectShowGuidName(aMediaType->subtype),
-                   aMediaType->TemporalCompression(),
-                   aMediaType->bFixedSizeSamples,
-                   aMediaType->SampleSize());
-    return S_OK;
-  }
-
-  DIRECTSHOW_LOG("OutputPin::CheckMediaType() Failed to match: major=%s minor=%s TC=%d FSS=%d SS=%u",
-                 GetDirectShowGuidName(aMediaType->majortype),
-                 GetDirectShowGuidName(aMediaType->subtype),
-                 aMediaType->TemporalCompression(),
-                 aMediaType->bFixedSizeSamples,
-                 aMediaType->SampleSize());
-  return S_FALSE;
-}
-
-HRESULT
-OutputPin::GetMediaType(int aPosition, MediaType* aMediaType)
-{
-  if (!aMediaType)
-    return E_POINTER;
-
-  if (aPosition == 0) {
-    aMediaType->Assign(mParentSource->GetMediaType());
-    return S_OK;
-  }
-  return VFW_S_NO_MORE_ITEMS;
-}
-
-static inline bool
-IsPowerOf2(int32_t x) {
-  return ((-x & x) != x);
-}
-
-STDMETHODIMP
-OutputPin::RequestAllocator(IMemAllocator* aPreferred,
-                            ALLOCATOR_PROPERTIES* aProps,
-                            IMemAllocator** aActual)
-{
-  // Require the downstream pin to suggest what they want...
-  if (!aPreferred) return E_POINTER;
-  if (!aProps) return E_POINTER;
-  if (!aActual) return E_POINTER;
-
-  // We only care about alignment - our allocator will reject anything
-  // which isn't power-of-2 aligned, so  so try a 4-byte aligned allocator.
-  ALLOCATOR_PROPERTIES props;
-  memcpy(&props, aProps, sizeof(ALLOCATOR_PROPERTIES));
-  if (aProps->cbAlign == 0 || IsPowerOf2(aProps->cbAlign)) {
-    props.cbAlign = 4;
-  }
-
-  // Limit allocator's number of buffers. We know that the media will most
-  // likely be bound by network speed, not by decoding speed. We also
-  // store the incoming data in a Gecko stream, if we don't limit buffers
-  // here we'll end up duplicating a lot of storage. We must have enough
-  // space for audio key frames to fit in the first batch of buffers however,
-  // else pausing may fail for some downstream decoders.
-  if (props.cBuffers > BaseFilter::sMaxNumBuffers) {
-    props.cBuffers = BaseFilter::sMaxNumBuffers;
-  }
-
-  // The allocator properties that are actually used. We don't store
-  // this, we need it for SetProperties() below to succeed.
-  ALLOCATOR_PROPERTIES actualProps;
-  HRESULT hr;
-
-  if (aPreferred) {
-    // Play nice and prefer the downstream pin's preferred allocator.
-    hr = aPreferred->SetProperties(&props, &actualProps);
-    if (SUCCEEDED(hr)) {
-      aPreferred->AddRef();
-      *aActual = aPreferred;
-      return S_OK;
-    }
-  }
-
-  // Else downstream hasn't requested a specific allocator, so create one...
-
-  // Just create a default allocator. It's highly unlikely that we'll use
-  // this anyway, as most parsers insist on using their own allocators.
-  RefPtr<IMemAllocator> allocator;
-  hr = CoCreateInstance(CLSID_MemoryAllocator,
-                        0,
-                        CLSCTX_INPROC_SERVER,
-                        IID_IMemAllocator,
-                        getter_AddRefs(allocator));
-  if(FAILED(hr) || (allocator == nullptr)) {
-    NS_WARNING("Can't create our own DirectShow allocator.");
-    return hr;
-  }
-
-  // See if we can make it suitable
-  hr = allocator->SetProperties(&props, &actualProps);
-  if (SUCCEEDED(hr)) {
-    // We need to release our refcount on pAlloc, and addref
-    // it to pass a refcount to the caller - this is a net nothing.
-    allocator.forget(aActual);
-    return S_OK;
-  }
-
-  NS_WARNING("Failed to pick an allocator");
-  return hr;
-}
-
-STDMETHODIMP
-OutputPin::Request(IMediaSample* aSample, DWORD_PTR aDwUser)
-{
-  if (!aSample) return E_FAIL;
-
-  CriticalSectionAutoEnter lock(*mLock);
-  NS_ASSERTION(!mFlushCount, "Request() while flushing");
-
-  if (mFlushCount)
-    return VFW_E_WRONG_STATE;
-
-  REFERENCE_TIME refStart = 0, refEnd = 0;
-  if (FAILED(aSample->GetTime(&refStart, &refEnd))) {
-    NS_WARNING("Sample incorrectly timestamped");
-    return VFW_E_SAMPLE_TIME_NOT_SET;
-  }
-
-  // Convert reference time to bytes.
-  uint32_t start = (uint32_t)(refStart / 10000000);
-  uint32_t end = (uint32_t)(refEnd / 10000000);
-
-  uint32_t numBytes = end - start;
-
-  ReadRequest* request = new ReadRequest(aSample,
-                                         aDwUser,
-                                         start,
-                                         numBytes);
-  // Memory for |request| is free when it's popped from the completed
-  // reads list.
-
-  // Push this onto the queue of reads to be serviced.
-  mPendingReads.Push(request);
-
-  // Notify any threads blocked in WaitForNext() which are waiting for mPendingReads
-  // to become non-empty.
-  mSignal.Notify();
-
-  return S_OK;
-}
-
-STDMETHODIMP
-OutputPin::WaitForNext(DWORD aTimeout,
-                       IMediaSample** aOutSample,
-                       DWORD_PTR* aOutDwUser)
-{
-  NS_ASSERTION(aTimeout == 0 || aTimeout == INFINITE,
-               "Oops, we don't handle this!");
-
-  *aOutSample = nullptr;
-  *aOutDwUser = 0;
-
-  LONGLONG offset = 0;
-  LONG count = 0;
-  BYTE* buf = nullptr;
-
-  {
-    CriticalSectionAutoEnter lock(*mLock);
-
-    // Wait until there's a pending read to service.
-    while (aTimeout && mPendingReads.GetSize() == 0 && !mFlushCount) {
-      // Note: No need to guard against shutdown-during-wait here, as
-      // typically the thread doing the pull will have already called
-      // Request(), so we won't Wait() here anyway. SyncRead() will fail
-      // on shutdown.
-      mSignal.Wait();
-    }
-
-    nsAutoPtr<ReadRequest> request(reinterpret_cast<ReadRequest*>(mPendingReads.PopFront()));
-    if (!request)
-      return VFW_E_WRONG_STATE;
-
-    *aOutSample = request->mSample;
-    *aOutDwUser = request->mDwUser;
-
-    offset = request->mOffset;
-    count = request->mCount;
-    buf = nullptr;
-    request->mSample->GetPointer(&buf);
-    NS_ASSERTION(buf != nullptr, "Invalid buffer!");
-
-    if (mFlushCount) {
-      return VFW_E_TIMEOUT;
-    }
-  }
-
-  return SyncRead(offset, count, buf);
-}
-
-STDMETHODIMP
-OutputPin::SyncReadAligned(IMediaSample* aSample)
-{
-  {
-    // Ignore reads while flushing.
-    CriticalSectionAutoEnter lock(*mLock);
-    if (mFlushCount) {
-      return S_FALSE;
-    }
-  }
-
-  if (!aSample)
-    return E_FAIL;
-
-  REFERENCE_TIME lStart = 0, lEnd = 0;
-  if (FAILED(aSample->GetTime(&lStart, &lEnd))) {
-    NS_WARNING("Sample incorrectly timestamped");
-    return VFW_E_SAMPLE_TIME_NOT_SET;
-  }
-
-  // Convert reference time to bytes.
-  int32_t start = (int32_t)(lStart / 10000000);
-  int32_t end = (int32_t)(lEnd / 10000000);
-
-  int32_t numBytes = end - start;
-
-  // If the range extends off the end of stream, truncate to the end of stream
-  // as per IAsyncReader specificiation.
-  int64_t streamLength = mResource.GetLength();
-  if (streamLength != -1) {
-    // We know the exact length of the stream, fail if the requested offset
-    // is beyond it.
-    if (start > streamLength) {
-      return VFW_E_BADALIGN;
-    }
-
-    // If the end of the chunk to read is off the end of the stream,
-    // truncate it to the end of the stream.
-    if ((start + numBytes) > streamLength) {
-      numBytes = (uint32_t)(streamLength - start);
-    }
-  }
-
-  BYTE* buf=0;
-  aSample->GetPointer(&buf);
-
-  return SyncRead(start, numBytes, buf);
-}
-
-STDMETHODIMP
-OutputPin::SyncRead(LONGLONG aPosition,
-                    LONG aLength,
-                    BYTE* aBuffer)
-{
-  MOZ_ASSERT(!NS_IsMainThread());
-  NS_ENSURE_TRUE(aPosition >= 0, E_FAIL);
-  NS_ENSURE_TRUE(aLength > 0, E_FAIL);
-  NS_ENSURE_TRUE(aBuffer, E_POINTER);
-
-  DIRECTSHOW_LOG("OutputPin::SyncRead(%lld, %d)", aPosition, aLength);
-  {
-    // Ignore reads while flushing.
-    CriticalSectionAutoEnter lock(*mLock);
-    if (mFlushCount) {
-      return S_FALSE;
-    }
-  }
-
-  uint32_t totalBytesRead = 0;
-  nsresult rv = mResource.ReadAt(aPosition,
-                                 reinterpret_cast<char*>(aBuffer),
-                                 aLength,
-                                 &totalBytesRead);
-  if (NS_FAILED(rv)) {
-    return E_FAIL;
-  }
-  if (totalBytesRead > 0) {
-    CriticalSectionAutoEnter lock(*mLock);
-    mBytesConsumed += totalBytesRead;
-  }
-  return (totalBytesRead == aLength) ? S_OK : S_FALSE;
-}
-
-STDMETHODIMP
-OutputPin::Length(LONGLONG* aTotal, LONGLONG* aAvailable)
-{
-  HRESULT hr = S_OK;
-  int64_t length = mResource.GetLength();
-  if (length == -1) {
-    hr = VFW_S_ESTIMATED;
-    // Don't have a length. Just lie, it seems to work...
-    *aTotal = INT32_MAX;
-  } else {
-    *aTotal = length;
-  }
-  if (aAvailable) {
-    *aAvailable = mResource.GetCachedDataEnd();
-  }
-
-  DIRECTSHOW_LOG("OutputPin::Length() len=%lld avail=%lld", *aTotal, *aAvailable);
-
-  return hr;
-}
-
-STDMETHODIMP
-OutputPin::BeginFlush()
-{
-  CriticalSectionAutoEnter lock(*mLock);
-  mFlushCount++;
-  mSignal.Notify();
-  return S_OK;
-}
-
-STDMETHODIMP
-OutputPin::EndFlush(void)
-{
-  CriticalSectionAutoEnter lock(*mLock);
-  mFlushCount--;
-  return S_OK;
-}
-
-uint32_t
-OutputPin::GetAndResetBytesConsumedCount()
-{
-  CriticalSectionAutoEnter lock(*mLock);
-  uint32_t bytesConsumed = mBytesConsumed;
-  mBytesConsumed = 0;
-  return bytesConsumed;
-}
-
-SourceFilter::SourceFilter(const GUID& aMajorType,
-                                               const GUID& aSubType)
-  : BaseFilter(L"MozillaDirectShowSource", __uuidof(SourceFilter))
-{
-  MOZ_COUNT_CTOR(SourceFilter);
-  mMediaType.majortype = aMajorType;
-  mMediaType.subtype = aSubType;
-
-  DIRECTSHOW_LOG("SourceFilter Constructor(%s, %s)",
-                 GetDirectShowGuidName(aMajorType),
-                 GetDirectShowGuidName(aSubType));
-}
-
-SourceFilter::~SourceFilter()
-{
-  MOZ_COUNT_DTOR(SourceFilter);
-  DIRECTSHOW_LOG("SourceFilter Destructor()");
-}
-
-BasePin*
-SourceFilter::GetPin(int n)
-{
-  if (n == 0) {
-    NS_ASSERTION(mOutputPin != 0, "GetPin with no pin!");
-    return static_cast<BasePin*>(mOutputPin);
-  } else {
-    return nullptr;
-  }
-}
-
-// Get's the media type we're supplying.
-const MediaType*
-SourceFilter::GetMediaType() const
-{
-  return &mMediaType;
-}
-
-nsresult
-SourceFilter::Init(MediaResource* aResource, int64_t aMP3Offset)
-{
-  DIRECTSHOW_LOG("SourceFilter::Init()");
-
-  mOutputPin = new OutputPin(aResource,
-                             this,
-                             mLock,
-                             aMP3Offset);
-  NS_ENSURE_TRUE(mOutputPin != nullptr, NS_ERROR_FAILURE);
-
-  return NS_OK;
-}
-
-uint32_t
-SourceFilter::GetAndResetBytesConsumedCount()
-{
-  return mOutputPin->GetAndResetBytesConsumedCount();
-}
-
-
-} // namespace mozilla
diff --git a/dom/media/directshow/SourceFilter.h b/dom/media/directshow/SourceFilter.h
deleted file mode 100644
index d5ce2770e..000000000
--- a/dom/media/directshow/SourceFilter.h
+++ /dev/null
@@ -1,75 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#if !defined(nsDirectShowSource_h___)
-#define nsDirectShowSource_h___
-
-#include "BaseFilter.h"
-#include "BasePin.h"
-#include "MediaType.h"
-
-#include "nsDeque.h"
-#include "nsAutoPtr.h"
-#include "DirectShowUtils.h"
-#include "mozilla/RefPtr.h"
-
-namespace mozilla {
-
-class MediaResource;
-class OutputPin;
-
-
-// SourceFilter is an asynchronous DirectShow source filter which
-// reads from an MediaResource, and supplies data via a pull model downstream
-// using OutputPin. It us used to supply a generic byte stream into
-// DirectShow.
-//
-// Implements:
-//  * IBaseFilter
-//  * IMediaFilter
-//  * IPersist
-//  * IUnknown
-//
-class DECLSPEC_UUID("5c2a7ad0-ba82-4659-9178-c4719a2765d6")
-SourceFilter : public media::BaseFilter
-{
-public:
-
-  // Constructs source filter to deliver given media type.
-  SourceFilter(const GUID& aMajorType, const GUID& aSubType);
-  ~SourceFilter();
-
-  nsresult Init(MediaResource *aResource, int64_t aMP3Offset);
-
-  // BaseFilter overrides.
-  // Only one output - the byte stream.
-  int GetPinCount() override { return 1; }
-
-  media::BasePin* GetPin(int n) override;
-
-  // Get's the media type we're supplying.
-  const media::MediaType* GetMediaType() const;
-
-  uint32_t GetAndResetBytesConsumedCount();
-
-protected:
-
-  // Our async pull output pin.
-  nsAutoPtr<OutputPin> mOutputPin;
-
-  // Type of byte stream we output.
-  media::MediaType mMediaType;
-
-};
-
-} // namespace mozilla
-
-// For mingw __uuidof support
-#ifdef __CRT_UUID_DECL
-__CRT_UUID_DECL(mozilla::SourceFilter, 0x5c2a7ad0,0xba82,0x4659,0x91,0x78,0xc4,0x71,0x9a,0x27,0x65,0xd6);
-#endif
-
-#endif
diff --git a/dom/media/directshow/moz.build b/dom/media/directshow/moz.build
deleted file mode 100644
index 8a9b76200..000000000
--- a/dom/media/directshow/moz.build
+++ /dev/null
@@ -1,41 +0,0 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-EXPORTS += [
-    'AudioSinkFilter.h',
-    'AudioSinkInputPin.h',
-    'DirectShowDecoder.h',
-    'DirectShowReader.h',
-    'DirectShowUtils.h',
-]
-
-UNIFIED_SOURCES += [
-    'DirectShowDecoder.cpp',
-    'DirectShowUtils.cpp',
-    'SourceFilter.cpp',
-]
-
-SOURCES += [
-    'AudioSinkFilter.cpp',
-    'AudioSinkInputPin.cpp',
-    'DirectShowReader.cpp',
-    'SampleSink.cpp',
-]
-
-# If WebRTC isn't being built, we need to compile the DirectShow base classes so that
-# they're available at link time.
-if not CONFIG['MOZ_WEBRTC']:
-    SOURCES += [
-        '/media/webrtc/trunk/webrtc/modules/video_capture/windows/BaseFilter.cpp',
-        '/media/webrtc/trunk/webrtc/modules/video_capture/windows/BaseInputPin.cpp',
-        '/media/webrtc/trunk/webrtc/modules/video_capture/windows/BasePin.cpp',
-        '/media/webrtc/trunk/webrtc/modules/video_capture/windows/MediaType.cpp',
-    ]
-
-FINAL_LIBRARY = 'xul'
-LOCAL_INCLUDES += [
-    '/media/webrtc/trunk/webrtc/modules/video_capture/windows',
-]
diff --git a/dom/media/eme/DetailedPromise.cpp b/dom/media/eme/DetailedPromise.cpp
index 5893bea2e..d443e3336 100644
--- a/dom/media/eme/DetailedPromise.cpp
+++ b/dom/media/eme/DetailedPromise.cpp
@@ -96,9 +96,6 @@ DetailedPromise::MaybeReportTelemetry(Status aStatus)
   uint32_t latency = (TimeStamp::Now() - mStartTime).ToMilliseconds();
   EME_LOG("%s %s latency %ums reported via telemetry", mName.get(),
           ((aStatus == Succeeded) ? "succcess" : "failure"), latency);
-  Telemetry::ID tid = (aStatus == Succeeded) ? mSuccessLatencyProbe.Value()
-                                             : mFailureLatencyProbe.Value();
-  Telemetry::Accumulate(tid, latency);
 }
 
 } // namespace dom
diff --git a/dom/media/eme/MediaKeySession.cpp b/dom/media/eme/MediaKeySession.cpp
index d5eff3f77..9c002b5ba 100644
--- a/dom/media/eme/MediaKeySession.cpp
+++ b/dom/media/eme/MediaKeySession.cpp
@@ -315,9 +315,6 @@ MediaKeySession::GenerateRequest(const nsAString& aInitDataType,
 
   // Note: Remaining steps of generateRequest method continue in CDM.
 
-  Telemetry::Accumulate(Telemetry::VIDEO_CDM_GENERATE_REQUEST_CALLED,
-                        ToCDMTypeTelemetryEnum(mKeySystem));
-
   // Convert initData to base64 for easier logging.
   // Note: CreateSession() Move()s the data out of the array, so we have
   // to copy it here.
diff --git a/dom/media/eme/MediaKeys.cpp b/dom/media/eme/MediaKeys.cpp
index eedd675e4..fea548698 100644
--- a/dom/media/eme/MediaKeys.cpp
+++ b/dom/media/eme/MediaKeys.cpp
@@ -13,7 +13,6 @@
 #include "mozilla/dom/MediaKeySession.h"
 #include "mozilla/dom/DOMException.h"
 #include "mozilla/dom/UnionTypes.h"
-#include "mozilla/Telemetry.h"
 #include "GMPCDMProxy.h"
 #ifdef MOZ_WIDGET_ANDROID
 #include "mozilla/MediaDrmCDMProxy.h"
@@ -457,7 +456,6 @@ MediaKeys::OnCDMCreated(PromiseId aId, const nsACString& aNodeId, const uint32_t
                                         mKeySystem,
                                         MediaKeySystemStatus::Cdm_created);
 
-  Telemetry::Accumulate(Telemetry::VIDEO_CDM_CREATED, ToCDMTypeTelemetryEnum(mKeySystem));
 }
 
 static bool
diff --git a/dom/media/fmp4/MP4Decoder.cpp b/dom/media/fmp4/MP4Decoder.cpp
index fdd6f2c7e..6954e9757 100644
--- a/dom/media/fmp4/MP4Decoder.cpp
+++ b/dom/media/fmp4/MP4Decoder.cpp
@@ -83,10 +83,6 @@ MP4Decoder::CanHandleMediaType(const MediaContentType& aType,
   const bool isMP4Audio = aType.GetMIMEType().EqualsASCII("audio/mp4") ||
                           aType.GetMIMEType().EqualsASCII("audio/x-m4a");
   const bool isMP4Video =
-  // On B2G, treat 3GPP as MP4 when Gonk PDM is available.
-#ifdef MOZ_GONK_MEDIACODEC
-      aType.GetMIMEType().EqualsASCII(VIDEO_3GPP) ||
-#endif
       aType.GetMIMEType().EqualsASCII("video/mp4") ||
       aType.GetMIMEType().EqualsASCII("video/quicktime") ||
       aType.GetMIMEType().EqualsASCII("video/x-m4v");
@@ -139,6 +135,14 @@ MP4Decoder::CanHandleMediaType(const MediaContentType& aType,
             NS_LITERAL_CSTRING("audio/flac"), aType));
         continue;
       }
+#ifdef MOZ_AV1
+      if (IsAV1CodecString(codec)) {
+        trackInfos.AppendElement(
+          CreateTrackInfoWithMIMETypeAndContentTypeExtraParameters(
+            NS_LITERAL_CSTRING("video/av1"), aType));
+        continue;
+      }
+#endif
       // Note: Only accept H.264 in a video content type, not in an audio
       // content type.
       if (IsWhitelistedH264Codec(codec) && isMP4Video) {
diff --git a/dom/media/fmp4/MP4Demuxer.cpp b/dom/media/fmp4/MP4Demuxer.cpp
index 646897468..ef68d5dca 100644
--- a/dom/media/fmp4/MP4Demuxer.cpp
+++ b/dom/media/fmp4/MP4Demuxer.cpp
@@ -16,9 +16,6 @@
 #include "mp4_demuxer/Index.h"
 #include "nsPrintfCString.h"
 
-// Used for telemetry
-#include "mozilla/Telemetry.h"
-#include "mp4_demuxer/AnnexB.h"
 #include "mp4_demuxer/H264.h"
 
 #include "nsAutoPtr.h"
@@ -72,47 +69,10 @@ private:
   // Queued samples extracted by the demuxer, but not yet returned.
   RefPtr<MediaRawData> mQueuedSample;
   bool mNeedReIndex;
-  bool mNeedSPSForTelemetry;
   bool mIsH264 = false;
 };
 
 
-// Returns true if no SPS was found and search for it should continue.
-bool
-AccumulateSPSTelemetry(const MediaByteBuffer* aExtradata)
-{
-  mp4_demuxer::SPSData spsdata;
-  if (mp4_demuxer::H264::DecodeSPSFromExtraData(aExtradata, spsdata)) {
-    uint8_t constraints = (spsdata.constraint_set0_flag ? (1 << 0) : 0) |
-                          (spsdata.constraint_set1_flag ? (1 << 1) : 0) |
-                          (spsdata.constraint_set2_flag ? (1 << 2) : 0) |
-                          (spsdata.constraint_set3_flag ? (1 << 3) : 0) |
-                          (spsdata.constraint_set4_flag ? (1 << 4) : 0) |
-                          (spsdata.constraint_set5_flag ? (1 << 5) : 0);
-    Telemetry::Accumulate(Telemetry::VIDEO_DECODED_H264_SPS_CONSTRAINT_SET_FLAG,
-                          constraints);
-
-    // Collect profile_idc values up to 244, otherwise 0 for unknown.
-    Telemetry::Accumulate(Telemetry::VIDEO_DECODED_H264_SPS_PROFILE,
-                          spsdata.profile_idc <= 244 ? spsdata.profile_idc : 0);
-
-    // Make sure level_idc represents a value between levels 1 and 5.2,
-    // otherwise collect 0 for unknown level.
-    Telemetry::Accumulate(Telemetry::VIDEO_DECODED_H264_SPS_LEVEL,
-                          (spsdata.level_idc >= 10 && spsdata.level_idc <= 52) ?
-                          spsdata.level_idc : 0);
-
-    // max_num_ref_frames should be between 0 and 16, anything larger will
-    // be treated as invalid.
-    Telemetry::Accumulate(Telemetry::VIDEO_H264_SPS_MAX_NUM_REF_FRAMES,
-                          std::min(spsdata.max_num_ref_frames, 17u));
-
-    return false;
-  }
-
-  return true;
-}
-
 MP4Demuxer::MP4Demuxer(MediaResource* aResource)
   : mResource(aResource)
   , mStream(new mp4_demuxer::ResourceStream(aResource))
@@ -243,25 +203,10 @@ MP4TrackDemuxer::MP4TrackDemuxer(MP4Demuxer* aParent,
   EnsureUpToDateIndex(); // Force update of index
 
   VideoInfo* videoInfo = mInfo->GetAsVideoInfo();
-  // Collect telemetry from h264 AVCC SPS.
   if (videoInfo &&
       (mInfo->mMimeType.EqualsLiteral("video/mp4") ||
        mInfo->mMimeType.EqualsLiteral("video/avc"))) {
     mIsH264 = true;
-    RefPtr<MediaByteBuffer> extraData = videoInfo->mExtraData;
-    mNeedSPSForTelemetry = AccumulateSPSTelemetry(extraData);
-    mp4_demuxer::SPSData spsdata;
-    if (mp4_demuxer::H264::DecodeSPSFromExtraData(extraData, spsdata) &&
-        spsdata.pic_width > 0 && spsdata.pic_height > 0 &&
-        mp4_demuxer::H264::EnsureSPSIsSane(spsdata)) {
-      videoInfo->mImage.width = spsdata.pic_width;
-      videoInfo->mImage.height = spsdata.pic_height;
-      videoInfo->mDisplay.width = spsdata.display_width;
-      videoInfo->mDisplay.height = spsdata.display_height;
-    }
-  } else {
-    // No SPS to be found.
-    mNeedSPSForTelemetry = false;
   }
 }
 
@@ -388,15 +333,6 @@ MP4TrackDemuxer::GetSamples(int32_t aNumSamples)
   if (samples->mSamples.IsEmpty()) {
     return SamplesPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_END_OF_STREAM, __func__);
   } else {
-    for (const auto& sample : samples->mSamples) {
-      // Collect telemetry from h264 Annex B SPS.
-      if (mNeedSPSForTelemetry && mp4_demuxer::AnnexB::HasSPS(sample)) {
-        RefPtr<MediaByteBuffer> extradata =
-        mp4_demuxer::AnnexB::ExtractExtraData(sample);
-        mNeedSPSForTelemetry = AccumulateSPSTelemetry(extradata);
-      }
-    }
-
     if (mNextKeyframeTime.isNothing() ||
         samples->mSamples.LastElement()->mTime >= mNextKeyframeTime.value().ToMicroseconds()) {
       SetNextKeyFrameTime();
diff --git a/dom/media/fmp4/MP4Stream.cpp b/dom/media/fmp4/MP4Stream.cpp
index 615a7dc01..9a79cac7a 100644
--- a/dom/media/fmp4/MP4Stream.cpp
+++ b/dom/media/fmp4/MP4Stream.cpp
@@ -48,9 +48,6 @@ MP4Stream::BlockingReadIntoCache(int64_t aOffset, size_t aCount, Monitor* aToUnl
   return true;
 }
 
-// We surreptitiously reimplement the supposedly-blocking ReadAt as a non-
-// blocking CachedReadAt, and record when it fails. This allows MP4Reader
-// to retry the read as an actual blocking read without holding the lock.
 bool
 MP4Stream::ReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
                   size_t* aBytesRead)
diff --git a/dom/media/fmp4/moz.build b/dom/media/fmp4/moz.build
index 6a249ae3e..a79fb0229 100644
--- a/dom/media/fmp4/moz.build
+++ b/dom/media/fmp4/moz.build
@@ -20,6 +20,3 @@ SOURCES += [
 ]
 
 FINAL_LIBRARY = 'xul'
-
-if CONFIG['MOZ_GONK_MEDIACODEC']:
-    DEFINES['MOZ_GONK_MEDIACODEC'] = True
diff --git a/dom/media/gmp/GMPParent.cpp b/dom/media/gmp/GMPParent.cpp
index 40c3e5141..418f14736 100644
--- a/dom/media/gmp/GMPParent.cpp
+++ b/dom/media/gmp/GMPParent.cpp
@@ -516,8 +516,7 @@ GMPCapability::Supports(const nsTArray<GMPCapability>& aCapabilities,
 #ifdef XP_WIN
         // Clearkey on Windows advertises that it can decode in its GMP info
         // file, but uses Windows Media Foundation to decode. That's not present
-        // on Windows XP, and on some Vista, Windows N, and KN variants without
-        // certain services packs.
+        // on Windows N and KN variants without certain services packs.
         if (tag.Equals(kEMEKeySystemClearkey)) {
           if (capabilities.mAPIName.EqualsLiteral(GMP_API_VIDEO_DECODER)) {
             if (!WMFDecoderModule::HasH264()) {
diff --git a/dom/media/gmp/widevine-adapter/WidevineAdapter.cpp b/dom/media/gmp/widevine-adapter/WidevineAdapter.cpp
index 74b5c38e8..57d4ecec2 100644
--- a/dom/media/gmp/widevine-adapter/WidevineAdapter.cpp
+++ b/dom/media/gmp/widevine-adapter/WidevineAdapter.cpp
@@ -46,7 +46,7 @@ void* GetCdmHost(int aHostInterfaceVersion, void* aUserData)
   Log("GetCdmHostFunc(%d, %p)", aHostInterfaceVersion, aUserData);
   WidevineDecryptor* decryptor = reinterpret_cast<WidevineDecryptor*>(aUserData);
   MOZ_ASSERT(decryptor);
-  return static_cast<cdm::Host_8*>(decryptor);
+  return static_cast<cdm::Host_9*>(decryptor);
 }
 
 #define STRINGIFY(s) _STRINGIFY(s)
@@ -106,8 +106,8 @@ WidevineAdapter::GMPGetAPI(const char* aAPIName,
 
     WidevineDecryptor* decryptor = new WidevineDecryptor();
 
-    auto cdm = reinterpret_cast<cdm::ContentDecryptionModule*>(
-      create(cdm::ContentDecryptionModule::kVersion,
+    auto cdm = reinterpret_cast<cdm::ContentDecryptionModule_9*>(
+      create(cdm::ContentDecryptionModule_9::kVersion,
              kEMEKeySystemWidevine.get(),
              kEMEKeySystemWidevine.Length(),
              &GetCdmHost,
@@ -161,8 +161,8 @@ WidevineAdapter::Supports(int32_t aModuleVersion,
                           int32_t aHostVersion)
 {
   return aModuleVersion == CDM_MODULE_VERSION &&
-         aInterfaceVersion == cdm::ContentDecryptionModule::kVersion &&
-         aHostVersion == cdm::Host_8::kVersion;
+         aInterfaceVersion == cdm::ContentDecryptionModule_9::kVersion &&
+         aHostVersion == cdm::Host_9::kVersion;
 }
 
 } // namespace mozilla
diff --git a/dom/media/gmp/widevine-adapter/WidevineDecryptor.cpp b/dom/media/gmp/widevine-adapter/WidevineDecryptor.cpp
index 149fa1701..4d3408804 100644
--- a/dom/media/gmp/widevine-adapter/WidevineDecryptor.cpp
+++ b/dom/media/gmp/widevine-adapter/WidevineDecryptor.cpp
@@ -102,7 +102,7 @@ WidevineDecryptor::CreateSession(uint32_t aCreateSessionToken,
   } else {
     // Invalid init data type
     const char* errorMsg = "Invalid init data type when creating session.";
-    OnRejectPromise(aPromiseId, kNotSupportedError, 0, errorMsg, sizeof(errorMsg));
+    OnRejectPromise(aPromiseId, kExceptionNotSupportedError, 0, errorMsg, sizeof(errorMsg));
     return;
   }
   mPromiseIdToNewSessionTokens[aPromiseId] = aCreateSessionToken;
@@ -302,6 +302,12 @@ WidevineDecryptor::GetCurrentWallTime()
 }
 
 void
+WidevineDecryptor::OnResolveKeyStatusPromise(uint32_t aPromiseId,
+                                            cdm::KeyStatus aKeyStatus) {
+  //TODO: The callback of GetStatusForPolicy. See Mozilla bug 1404230.
+}
+
+void
 WidevineDecryptor::OnResolveNewSessionPromise(uint32_t aPromiseId,
                                               const char* aSessionId,
                                               uint32_t aSessionIdSize)
@@ -333,41 +339,59 @@ WidevineDecryptor::OnResolvePromise(uint32_t aPromiseId)
 }
 
 static GMPDOMException
-ToGMPDOMException(cdm::Error aError)
-{
-  switch (aError) {
-    case kNotSupportedError: return kGMPNotSupportedError;
-    case kInvalidStateError: return kGMPInvalidStateError;
-    case kInvalidAccessError:
-      // Note: Chrome converts kInvalidAccessError to TypeError, since the
-      // Chromium CDM API doesn't have a type error enum value. The EME spec
-      // requires TypeError in some places, so we do the same conversion.
-      // See bug 1313202.
-      return kGMPTypeError;
-    case kQuotaExceededError: return kGMPQuotaExceededError;
+ConvertCDMExceptionToGMPDOMException(cdm::Exception aException)
+{
+  switch (aException) {
+    case kExceptionNotSupportedError: return kGMPNotSupportedError;
+    case kExceptionInvalidStateError: return kGMPInvalidStateError;
+    case kExceptionTypeError: return kGMPTypeError;
+    case kExceptionQuotaExceededError: return kGMPQuotaExceededError;
     case kUnknownError: return kGMPInvalidModificationError; // Note: Unique placeholder.
     case kClientError: return kGMPAbortError; // Note: Unique placeholder.
     case kOutputError: return kGMPSecurityError; // Note: Unique placeholder.
   };
-  return kGMPTimeoutError; // Note: Unique placeholder.
+  return kGMPInvalidStateError; // Note: Unique placeholder.
+}
+
+// Align with spec, the Exceptions used by CDM to reject promises .
+// https://w3c.github.io/encrypted-media/#exceptions
+cdm::Exception
+ConvertCDMErrorToCDMException(cdm::Error error) {
+  switch (error) {
+    case cdm::kNotSupportedError:
+      return cdm::Exception::kExceptionNotSupportedError;
+    case cdm::kInvalidStateError:
+      return cdm::Exception::kExceptionInvalidStateError;
+    case cdm::kInvalidAccessError:
+      return cdm::Exception::kExceptionTypeError;
+    case cdm::kQuotaExceededError:
+      return cdm::Exception::kExceptionQuotaExceededError;
+
+    case cdm::kUnknownError:
+    case cdm::kClientError:
+    case cdm::kOutputError:
+      break;
+  }
+
+  return cdm::Exception::kExceptionInvalidStateError;
 }
 
 void
 WidevineDecryptor::OnRejectPromise(uint32_t aPromiseId,
-                                   Error aError,
+                                   cdm::Exception aException,
                                    uint32_t aSystemCode,
                                    const char* aErrorMessage,
                                    uint32_t aErrorMessageSize)
 {
   if (!mCallback) {
     Log("Decryptor::OnRejectPromise(aPromiseId=%d, err=%d, sysCode=%u, msg=%s) FAIL; !mCallback",
-        aPromiseId, (int)aError, aSystemCode, aErrorMessage);
+        aPromiseId, (int)aException, aSystemCode, aErrorMessage);
     return;
   }
   Log("Decryptor::OnRejectPromise(aPromiseId=%d, err=%d, sysCode=%u, msg=%s)",
-      aPromiseId, (int)aError, aSystemCode, aErrorMessage);
+      aPromiseId, (int)aException, aSystemCode, aErrorMessage);
   mCallback->RejectPromise(aPromiseId,
-                           ToGMPDOMException(aError),
+                           ConvertCDMExceptionToGMPDOMException(aException),
                            !aErrorMessageSize ? "" : aErrorMessage,
                            aErrorMessageSize);
 }
@@ -386,11 +410,9 @@ ToGMPMessageType(MessageType message_type)
 void
 WidevineDecryptor::OnSessionMessage(const char* aSessionId,
                                     uint32_t aSessionIdSize,
-                                    MessageType aMessageType,
+                                    cdm::MessageType aMessageType,
                                     const char* aMessage,
-                                    uint32_t aMessageSize,
-                                    const char* aLegacyDestinationUrl,
-                                    uint32_t aLegacyDestinationUrlLength)
+                                    uint32_t aMessageSize)
 {
   if (!mCallback) {
     Log("Decryptor::OnSessionMessage() FAIL; !mCallback");
@@ -479,28 +501,6 @@ WidevineDecryptor::OnSessionClosed(const char* aSessionId,
 }
 
 void
-WidevineDecryptor::OnLegacySessionError(const char* aSessionId,
-                                        uint32_t aSessionIdLength,
-                                        Error aError,
-                                        uint32_t aSystemCode,
-                                        const char* aErrorMessage,
-                                        uint32_t aErrorMessageLength)
-{
-  if (!mCallback) {
-    Log("Decryptor::OnLegacySessionError(sid=%s, error=%d) FAIL; !mCallback",
-        aSessionId, (int)aError);
-    return;
-  }
-  Log("Decryptor::OnLegacySessionError(sid=%s, error=%d)", aSessionId, (int)aError);
-  mCallback->SessionError(aSessionId,
-                          aSessionIdLength,
-                          ToGMPDOMException(aError),
-                          aSystemCode,
-                          aErrorMessage,
-                          aErrorMessageLength);
-}
-
-void
 WidevineDecryptor::SendPlatformChallenge(const char* aServiceId,
                                          uint32_t aServiceIdSize,
                                          const char* aChallenge,
@@ -538,4 +538,17 @@ WidevineDecryptor::CreateFileIO(FileIOClient* aClient)
   return new WidevineFileIO(aClient);
 }
 
+void
+WidevineDecryptor::RequestStorageId(uint32_t aVersion)
+{
+  Log("Decryptor::RequestStorageId() aVersion = %u", aVersion);
+  if (aVersion >= 0x80000000) {
+    mCDM->OnStorageId(aVersion, nullptr, 0);
+    return;
+  }
+
+  //TODO: Need to provide a menaingful buffer instead of a dummy one.
+  mCDM->OnStorageId(aVersion, new uint8_t[1024*1024], 1024 * 1024);
+}
+
 } // namespace mozilla
diff --git a/dom/media/gmp/widevine-adapter/WidevineDecryptor.h b/dom/media/gmp/widevine-adapter/WidevineDecryptor.h
index d5185192b..f291c321d 100644
--- a/dom/media/gmp/widevine-adapter/WidevineDecryptor.h
+++ b/dom/media/gmp/widevine-adapter/WidevineDecryptor.h
@@ -16,7 +16,7 @@
 namespace mozilla {
 
 class WidevineDecryptor : public GMPDecryptor
-                        , public cdm::Host_8
+                        , public cdm::Host_9
 {
 public:
 
@@ -69,16 +69,19 @@ public:
   void DecryptingComplete() override;
 
 
-  // cdm::Host_8
+  // cdm::Host_9 implementation
   cdm::Buffer* Allocate(uint32_t aCapacity) override;
   void SetTimer(int64_t aDelayMs, void* aContext) override;
   cdm::Time GetCurrentWallTime() override;
+  // cdm::Host_9 interface
+  void OnResolveKeyStatusPromise(uint32_t aPromiseId,
+                                 cdm::KeyStatus aKeyStatus) override;
   void OnResolveNewSessionPromise(uint32_t aPromiseId,
                                   const char* aSessionId,
                                   uint32_t aSessionIdSize) override;
   void OnResolvePromise(uint32_t aPromiseId) override;
   void OnRejectPromise(uint32_t aPromiseId,
-                       cdm::Error aError,
+                       cdm::Exception aException,
                        uint32_t aSystemCode,
                        const char* aErrorMessage,
                        uint32_t aErrorMessageSize) override;
@@ -86,9 +89,7 @@ public:
                         uint32_t aSessionIdSize,
                         cdm::MessageType aMessageType,
                         const char* aMessage,
-                        uint32_t aMessageSize,
-                        const char* aLegacyDestinationUrl,
-                        uint32_t aLegacyDestinationUrlLength) override;
+                        uint32_t aMessageSize) override;
   void OnSessionKeysChange(const char* aSessionId,
                            uint32_t aSessionIdSize,
                            bool aHasAdditionalUsableKey,
@@ -99,12 +100,6 @@ public:
                           cdm::Time aNewExpiryTime) override;
   void OnSessionClosed(const char* aSessionId,
                        uint32_t aSessionIdSize) override;
-  void OnLegacySessionError(const char* aSessionId,
-                            uint32_t aSessionId_length,
-                            cdm::Error aError,
-                            uint32_t aSystemCode,
-                            const char* aErrorMessage,
-                            uint32_t aErrorMessageLength) override;
   void SendPlatformChallenge(const char* aServiceId,
                              uint32_t aServiceIdSize,
                              const char* aChallenge,
@@ -113,6 +108,9 @@ public:
   void QueryOutputProtectionStatus() override;
   void OnDeferredInitializationDone(cdm::StreamType aStreamType,
                                     cdm::Status aDecoderStatus) override;
+  // cdm::Host_9 interface
+  // NOTE: the interface has changed upstream.
+  void RequestStorageId(uint32_t aVersion) override;
   cdm::FileIO* CreateFileIO(cdm::FileIOClient* aClient) override;
 
   GMPDecryptorCallback* Callback() const { return mCallback; }
@@ -120,7 +118,7 @@ public:
 private:
   ~WidevineDecryptor();
   RefPtr<CDMWrapper> mCDM;
-  cdm::ContentDecryptionModule_8* CDM() { return mCDM->GetCDM(); }
+  cdm::ContentDecryptionModule_9* CDM() { return mCDM->GetCDM(); }
 
   GMPDecryptorCallback* mCallback;
   std::map<uint32_t, uint32_t> mPromiseIdToNewSessionTokens;
diff --git a/dom/media/gmp/widevine-adapter/WidevineUtils.cpp b/dom/media/gmp/widevine-adapter/WidevineUtils.cpp
index 925dfe1a1..10c6c2e18 100644
--- a/dom/media/gmp/widevine-adapter/WidevineUtils.cpp
+++ b/dom/media/gmp/widevine-adapter/WidevineUtils.cpp
@@ -43,7 +43,7 @@ ToGMPErr(cdm::Status aStatus)
     case cdm::kSuccess: return GMPNoErr;
     case cdm::kNeedMoreData: return GMPGenericErr;
     case cdm::kNoKey: return GMPNoKeyErr;
-    case cdm::kSessionError: return GMPGenericErr;
+    case cdm::kInitializationError: return GMPGenericErr;
     case cdm::kDecryptError: return GMPCryptoErr;
     case cdm::kDecodeError: return GMPDecodeErr;
     case cdm::kDeferredInitialization: return GMPGenericErr;
@@ -77,7 +77,7 @@ void InitInputBuffer(const GMPEncryptedBufferMetadata* aCrypto,
   aInputBuffer.timestamp = aTimestamp;
 }
 
-CDMWrapper::CDMWrapper(cdm::ContentDecryptionModule_8* aCDM,
+CDMWrapper::CDMWrapper(cdm::ContentDecryptionModule_9* aCDM,
                        WidevineDecryptor* aDecryptor)
   : mCDM(aCDM)
   , mDecryptor(aDecryptor)
diff --git a/dom/media/gmp/widevine-adapter/WidevineUtils.h b/dom/media/gmp/widevine-adapter/WidevineUtils.h
index 57c004a87..2f6137fe3 100644
--- a/dom/media/gmp/widevine-adapter/WidevineUtils.h
+++ b/dom/media/gmp/widevine-adapter/WidevineUtils.h
@@ -48,12 +48,16 @@ class CDMWrapper {
 public:
   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CDMWrapper)
 
-  explicit CDMWrapper(cdm::ContentDecryptionModule_8* aCDM,
+  explicit CDMWrapper(cdm::ContentDecryptionModule_9* aCDM,
                       WidevineDecryptor* aDecryptor);
-  cdm::ContentDecryptionModule_8* GetCDM() const { return mCDM; }
+  cdm::ContentDecryptionModule_9* GetCDM() const { return mCDM; }
+  void OnStorageId(uint32_t aVersion, const uint8_t* aStorageId,
+                   uint32_t aStorageIdSize) {
+    mCDM->OnStorageId(aVersion, aStorageId, aStorageIdSize);
+  }
 private:
   ~CDMWrapper();
-  cdm::ContentDecryptionModule_8* mCDM;
+  cdm::ContentDecryptionModule_9* mCDM;
   RefPtr<WidevineDecryptor> mDecryptor;
 };
 
diff --git a/dom/media/gmp/widevine-adapter/WidevineVideoDecoder.h b/dom/media/gmp/widevine-adapter/WidevineVideoDecoder.h
index b143f75f7..f5e63519b 100644
--- a/dom/media/gmp/widevine-adapter/WidevineVideoDecoder.h
+++ b/dom/media/gmp/widevine-adapter/WidevineVideoDecoder.h
@@ -45,7 +45,7 @@ private:
 
   ~WidevineVideoDecoder();
 
-  cdm::ContentDecryptionModule_8* CDM() const {
+  cdm::ContentDecryptionModule_9* CDM() const {
     // CDM should only be accessed before 'DecodingComplete'.
     MOZ_ASSERT(mCDMWrapper);
     // CDMWrapper ensure the CDM is non-null, no need to check again.
diff --git a/dom/media/gmp/widevine-adapter/content_decryption_module.h b/dom/media/gmp/widevine-adapter/content_decryption_module.h
index 512ca9768..0539135fb 100644
--- a/dom/media/gmp/widevine-adapter/content_decryption_module.h
+++ b/dom/media/gmp/widevine-adapter/content_decryption_module.h
@@ -5,6 +5,8 @@
 #ifndef CDM_CONTENT_DECRYPTION_MODULE_H_
 #define CDM_CONTENT_DECRYPTION_MODULE_H_
 
+#include "content_decryption_module_export.h"
+
 #if defined(_MSC_VER)
 typedef unsigned char uint8_t;
 typedef unsigned int uint32_t;
@@ -14,25 +16,21 @@ typedef __int64 int64_t;
 #include <stdint.h>
 #endif
 
-// Define CDM_EXPORT so that functionality implemented by the CDM module
-// can be exported to consumers.
-#if defined(WIN32)
-
-#if defined(CDM_IMPLEMENTATION)
-#define CDM_EXPORT __declspec(dllexport)
-#else
-#define CDM_EXPORT __declspec(dllimport)
-#endif  // defined(CDM_IMPLEMENTATION)
-
-#else  // defined(WIN32)
-
-#if defined(CDM_IMPLEMENTATION)
-#define CDM_EXPORT __attribute__((visibility("default")))
+// Define CDM_CLASS_API to export class types. We have to add visibility
+// attributes to make sure virtual tables in CDM consumer and CDM implementation
+// are the same. Generally, it was always a good idea, as there're no guarantees
+// about that for the internal symbols, but it has only become a practical issue
+// after introduction of LTO devirtualization. See more details on
+// https://crbug.com/609564#c35
+#if defined(_WIN32)
+#if defined(__clang__)
+#define CDM_CLASS_API [[clang::lto_visibility_public]]
 #else
-#define CDM_EXPORT
+#define CDM_CLASS_API
 #endif
-
-#endif  // defined(WIN32)
+#else  // defined(_WIN32)
+#define CDM_CLASS_API __attribute__((visibility("default")))
+#endif  // defined(_WIN32)
 
 // The version number must be rolled when the exported functions are updated!
 // If the CDM and the adapter use different versions of these functions, the
@@ -48,9 +46,9 @@ typedef __int64 int64_t;
 #define BUILD_ENTRYPOINT_NO_EXPANSION(name, version) name##_##version
 
 extern "C" {
-CDM_EXPORT void INITIALIZE_CDM_MODULE();
+CDM_API void INITIALIZE_CDM_MODULE();
 
-CDM_EXPORT void DeinitializeCdmModule();
+CDM_API void DeinitializeCdmModule();
 
 // Returns a pointer to the requested CDM Host interface upon success.
 // Returns NULL if the requested CDM Host interface is not supported.
@@ -65,30 +63,30 @@ typedef void* (*GetCdmHostFunc)(int host_interface_version, void* user_data);
 // |cdm_interface_version|.
 // Caller retains ownership of arguments and must call Destroy() on the returned
 // object.
-CDM_EXPORT void* CreateCdmInstance(
+CDM_API void* CreateCdmInstance(
     int cdm_interface_version,
     const char* key_system, uint32_t key_system_size,
     GetCdmHostFunc get_cdm_host_func, void* user_data);
 
-CDM_EXPORT const char* GetCdmVersion();
+CDM_API const char* GetCdmVersion();
 }
 
 namespace cdm {
 
-class AudioFrames;
-class DecryptedBlock;
-class VideoFrame;
+class CDM_CLASS_API AudioFrames;
+class CDM_CLASS_API DecryptedBlock;
+class CDM_CLASS_API VideoFrame;
 
-class Host_7;
-class Host_8;
+class CDM_CLASS_API Host_8;
+class CDM_CLASS_API Host_9;
 
 enum Status {
   kSuccess = 0,
   kNeedMoreData,  // Decoder needs more data to produce a decoded frame/sample.
-  kNoKey,  // The required decryption key is not available.
-  kSessionError,  // Session management error.
-  kDecryptError,  // Decryption failed.
-  kDecodeError,  // Error decoding audio or video.
+  kNoKey,         // The required decryption key is not available.
+  kInitializationError,    // Initialization error.
+  kDecryptError,           // Decryption failed.
+  kDecodeError,            // Error decoding audio or video.
   kDeferredInitialization  // Decoder is not ready for initialization.
 };
 
@@ -97,6 +95,7 @@ enum Status {
 // The following starts with the list of DOM4 exceptions from:
 // http://www.w3.org/TR/dom/#domexception
 // Some DOM4 exceptions are not included as they are not expected to be used.
+// Should only be used on Host_8 and before.
 enum Error {
   kNotSupportedError = 9,
   kInvalidStateError = 11,
@@ -113,8 +112,20 @@ enum Error {
   kOutputError = 101
 };
 
-// Time is defined as the number of seconds since the
-// Epoch (00:00:00 UTC, January 1, 1970).
+// Exceptions used by the CDM to reject promises.
+// https://w3c.github.io/encrypted-media/#exceptions
+enum Exception {
+  kExceptionTypeError,
+  kExceptionNotSupportedError,
+  kExceptionInvalidStateError,
+  kExceptionQuotaExceededError
+};
+
+// Time is defined as the number of seconds since the Epoch
+// (00:00:00 UTC, January 1, 1970), not including any added leap second.
+// Also see Time definition in spec: https://w3c.github.io/encrypted-media/#time
+// Note that Time is defined in millisecond accuracy in the spec but in second
+// accuracy here.
 typedef double Time;
 
 // An input buffer can be split into several continuous subsamples.
@@ -151,13 +162,13 @@ struct SubsampleEntry {
 // unencrypted.
 struct InputBuffer {
   InputBuffer()
-      : data(NULL),
+      : data(nullptr),
         data_size(0),
-        key_id(NULL),
+        key_id(nullptr),
         key_id_size(0),
-        iv(NULL),
+        iv(nullptr),
         iv_size(0),
-        subsamples(NULL),
+        subsamples(nullptr),
         num_subsamples(0),
         timestamp(0) {}
 
@@ -188,7 +199,7 @@ struct AudioDecoderConfig {
         channel_count(0),
         bits_per_channel(0),
         samples_per_second(0),
-        extra_data(NULL),
+        extra_data(nullptr),
         extra_data_size(0) {}
 
   AudioCodec codec;
@@ -214,10 +225,25 @@ enum AudioFormat {
 };
 
 // Surface formats based on FOURCC labels, see: http://www.fourcc.org/yuv.php
+// Values are chosen to be consistent with Chromium's VideoPixelFormat values.
 enum VideoFormat {
   kUnknownVideoFormat = 0,  // Unknown format value. Used for error reporting.
-  kYv12,  // 12bpp YVU planar 1x1 Y, 2x2 VU samples.
-  kI420  // 12bpp YVU planar 1x1 Y, 2x2 UV samples.
+  kYv12 = 1,                // 12bpp YVU planar 1x1 Y, 2x2 VU samples.
+  kI420 = 2,                // 12bpp YUV planar 1x1 Y, 2x2 UV samples.
+
+  // In the following formats, each sample uses 16-bit in storage, while the
+  // sample value is stored in the least significant N bits where N is
+  // specified by the number after "P". For example, for YUV420P9, each Y, U,
+  // and V sample is stored in the least significant 9 bits in a 2-byte block.
+  kYUV420P9 = 16,
+  kYUV420P10 = 17,
+  kYUV422P9 = 18,
+  kYUV422P10 = 19,
+  kYUV444P9 = 20,
+  kYUV444P10 = 21,
+  kYUV420P12 = 22,
+  kYUV422P12 = 23,
+  kYUV444P12 = 24,
 };
 
 struct Size {
@@ -245,14 +271,19 @@ struct VideoDecoderConfig {
     kH264ProfileHigh,
     kH264ProfileHigh10,
     kH264ProfileHigh422,
-    kH264ProfileHigh444Predictive
+    kH264ProfileHigh444Predictive,
+    // VP9 Profiles are only passed in starting from CDM_9.
+    kVP9Profile0,
+    kVP9Profile1,
+    kVP9Profile2,
+    kVP9Profile3
   };
 
   VideoDecoderConfig()
       : codec(kUnknownVideoCodec),
         profile(kUnknownVideoCodecProfile),
         format(kUnknownVideoFormat),
-        extra_data(NULL),
+        extra_data(nullptr),
         extra_data_size(0) {}
 
   VideoCodec codec;
@@ -294,7 +325,7 @@ struct PlatformChallengeResponse {
 
 // Used when passing arrays of binary data. Does not own the referenced data.
 struct BinaryData {
-  BinaryData() : data(NULL), length(0) {}
+  BinaryData() : data(nullptr), length(0) {}
   const uint8_t* data;
   uint32_t length;
 };
@@ -316,7 +347,10 @@ enum KeyStatus {
 // should be 0 when |status| == kUsable.
 struct KeyInformation {
   KeyInformation()
-      : key_id(NULL), key_id_size(0), status(kInternalError), system_code(0) {}
+      : key_id(nullptr),
+        key_id_size(0),
+        status(kInternalError),
+        system_code(0) {}
   const uint8_t* key_id;
   uint32_t key_id_size;
   KeyStatus status;
@@ -372,6 +406,24 @@ enum MessageType {
   kLicenseRelease = 2
 };
 
+enum HdcpVersion {
+  kHdcpVersionNone,
+  kHdcpVersion1_0,
+  kHdcpVersion1_1,
+  kHdcpVersion1_2,
+  kHdcpVersion1_3,
+  kHdcpVersion1_4,
+  kHdcpVersion2_0,
+  kHdcpVersion2_1,
+  kHdcpVersion2_2
+};
+
+struct Policy {
+  Policy() : min_hdcp_version(kHdcpVersionNone) {}
+
+  HdcpVersion min_hdcp_version;
+};
+
 // FileIO interface provides a way for the CDM to store data in a file in
 // persistent storage. This interface aims only at providing basic read/write
 // capabilities and should not be used as a full fledged file IO API.
@@ -381,7 +433,7 @@ enum MessageType {
 // Note to implementors of this interface:
 // Per-origin storage and the ability for users to clear it are important.
 // See http://www.w3.org/TR/encrypted-media/#privacy-storedinfo.
-class FileIO {
+class CDM_CLASS_API FileIO {
  public:
   // Opens the file with |file_name| for read and write.
   // FileIOClient::OnOpenComplete() will be called after the opening
@@ -389,8 +441,9 @@ class FileIO {
   // - When the file is opened by a CDM instance, it will be classified as "in
   //   use". In this case other CDM instances in the same domain may receive
   //   kInUse status when trying to open it.
-  // - |file_name| must not contain forward slash ('/') or backslash ('\'), and
-  //   must not start with an underscore ('_').
+  // - |file_name| must only contain letters (A-Za-z), digits(0-9), or "._-".
+  //   It must not start with an underscore ('_'), and must be at least 1
+  //   character and no more than 256 characters long.
   virtual void Open(const char* file_name, uint32_t file_name_size) = 0;
 
   // Reads the contents of the file. FileIOClient::OnReadComplete() will be
@@ -421,7 +474,7 @@ class FileIO {
 // When kError is returned, the FileIO object could be in an error state. All
 // following calls (other than Close()) could return kError. The CDM should
 // still call Close() to destroy the FileIO object.
-class FileIOClient {
+class CDM_CLASS_API FileIOClient {
  public:
   enum Status {
     kSuccess = 0,
@@ -462,10 +515,20 @@ class FileIOClient {
 // provided in CreateCdmInstance() to allocate any Buffer that needs to
 // be passed back to the caller. Implementations must call Buffer::Destroy()
 // when a Buffer is created that will never be returned to the caller.
-class ContentDecryptionModule_7 {
+class CDM_CLASS_API ContentDecryptionModule_8 {
  public:
-  static const int kVersion = 7;
-  typedef Host_7 Host;
+  static const int kVersion = 8;
+  typedef Host_8 Host;
+
+  // Initializes the CDM instance, providing information about permitted
+  // functionalities.
+  // If |allow_distinctive_identifier| is false, messages from the CDM,
+  // such as message events, must not contain a Distinctive Identifier,
+  // even in an encrypted form.
+  // If |allow_persistent_state| is false, the CDM must not attempt to
+  // persist state. Calls to CreateFileIO() will fail.
+  virtual void Initialize(bool allow_distinctive_identifier,
+                          bool allow_persistent_state) = 0;
 
   // SetServerCertificate(), CreateSessionAndGenerateRequest(), LoadSession(),
   // UpdateSession(), CloseSession(), and RemoveSession() all accept a
@@ -484,8 +547,7 @@ class ContentDecryptionModule_7 {
   // or Host::OnRejectPromise().
   virtual void CreateSessionAndGenerateRequest(uint32_t promise_id,
                                                SessionType session_type,
-                                               const char* init_data_type,
-                                               uint32_t init_data_type_size,
+                                               InitDataType init_data_type,
                                                const uint8_t* init_data,
                                                uint32_t init_data_size) = 0;
 
@@ -631,8 +693,8 @@ class ContentDecryptionModule_7 {
   virtual void Destroy() = 0;
 
  protected:
-  ContentDecryptionModule_7() {}
-  virtual ~ContentDecryptionModule_7() {}
+  ContentDecryptionModule_8() {}
+  virtual ~ContentDecryptionModule_8() {}
 };
 
 // ContentDecryptionModule interface that all CDMs need to implement.
@@ -641,10 +703,10 @@ class ContentDecryptionModule_7 {
 // provided in CreateCdmInstance() to allocate any Buffer that needs to
 // be passed back to the caller. Implementations must call Buffer::Destroy()
 // when a Buffer is created that will never be returned to the caller.
-class ContentDecryptionModule_8 {
+class CDM_CLASS_API ContentDecryptionModule_9 {
  public:
-  static const int kVersion = 8;
-  typedef Host_8 Host;
+  static const int kVersion = 9;
+  typedef Host_9 Host;
 
   // Initializes the CDM instance, providing information about permitted
   // functionalities.
@@ -656,6 +718,13 @@ class ContentDecryptionModule_8 {
   virtual void Initialize(bool allow_distinctive_identifier,
                           bool allow_persistent_state) = 0;
 
+  // Gets the key status if the CDM has a hypothetical key with the |policy|.
+  // The CDM must respond by calling either Host::OnResolveKeyStatusPromise()
+  // with the result key status or Host::OnRejectPromise() if an unexpected
+  // error happened or this method is not supported.
+  virtual void GetStatusForPolicy(uint32_t promise_id,
+                                  const Policy& policy) = 0;
+
   // SetServerCertificate(), CreateSessionAndGenerateRequest(), LoadSession(),
   // UpdateSession(), CloseSession(), and RemoveSession() all accept a
   // |promise_id|, which must be passed to the completion Host method
@@ -731,8 +800,8 @@ class ContentDecryptionModule_8 {
   //
   // Returns kSuccess if the |audio_decoder_config| is supported and the CDM
   // audio decoder is successfully initialized.
-  // Returns kSessionError if |audio_decoder_config| is not supported. The CDM
-  // may still be able to do Decrypt().
+  // Returns kInitializationError if |audio_decoder_config| is not supported.
+  // The CDM may still be able to do Decrypt().
   // Returns kDeferredInitialization if the CDM is not ready to initialize the
   // decoder at this time. Must call Host::OnDeferredInitializationDone() once
   // initialization is complete.
@@ -744,8 +813,8 @@ class ContentDecryptionModule_8 {
   //
   // Returns kSuccess if the |video_decoder_config| is supported and the CDM
   // video decoder is successfully initialized.
-  // Returns kSessionError if |video_decoder_config| is not supported. The CDM
-  // may still be able to do Decrypt().
+  // Returns kInitializationError if |video_decoder_config| is not supported.
+  // The CDM may still be able to do Decrypt().
   // Returns kDeferredInitialization if the CDM is not ready to initialize the
   // decoder at this time. Must call Host::OnDeferredInitializationDone() once
   // initialization is complete.
@@ -815,18 +884,30 @@ class ContentDecryptionModule_8 {
       uint32_t link_mask,
       uint32_t output_protection_mask) = 0;
 
+  // Called by the host after a call to Host::RequestStorageId(). If the
+  // version of the storage ID requested is available, |storage_id| and
+  // |storage_id_size| are set appropriately. |version| will be the same as
+  // what was requested, unless 0 (latest) was requested, in which case
+  // |version| will be the actual version number for the |storage_id| returned.
+  // If the requested version is not available, null/zero will be provided as
+  // |storage_id| and |storage_id_size|, respectively, and |version| should be
+  // ignored.
+  virtual void OnStorageId(uint32_t version,
+                           const uint8_t* storage_id,
+                           uint32_t storage_id_size) = 0;
+
   // Destroys the object in the same context as it was created.
   virtual void Destroy() = 0;
 
  protected:
-  ContentDecryptionModule_8() {}
-  virtual ~ContentDecryptionModule_8() {}
+  ContentDecryptionModule_9() {}
+  virtual ~ContentDecryptionModule_9() {}
 };
 
-typedef ContentDecryptionModule_8 ContentDecryptionModule;
+typedef ContentDecryptionModule_9 ContentDecryptionModule;
 
 // Represents a buffer created by Allocator implementations.
-class Buffer {
+class CDM_CLASS_API Buffer {
  public:
   // Destroys the buffer in the same context as it was created.
   virtual void Destroy() = 0;
@@ -845,9 +926,9 @@ class Buffer {
   void operator=(const Buffer&);
 };
 
-class Host_7 {
+class CDM_CLASS_API Host_8 {
  public:
-  static const int kVersion = 7;
+  static const int kVersion = 8;
 
   // Returns a Buffer* containing non-zero members upon success, or NULL on
   // failure. The caller owns the Buffer* after this call. The buffer is not
@@ -859,7 +940,7 @@ class Host_7 {
   // from now with |context|.
   virtual void SetTimer(int64_t delay_ms, void* context) = 0;
 
-  // Returns the current wall time in seconds.
+  // Returns the current wall time.
   virtual Time GetCurrentWallTime() = 0;
 
   // Called by the CDM when a session is created or loaded and the value for the
@@ -917,8 +998,10 @@ class Host_7 {
   // session |session_id|. This can happen as the result of an Update() call
   // or some other event. If this happens as a result of a call to Update(),
   // it must be called before resolving the Update() promise. |new_expiry_time|
-  // can be 0 to represent "undefined". Size parameter should not include
-  // null termination.
+  // represents the time after which the key(s) in the session will no longer
+  // be usable for decryption. It can be 0 if no such time exists or if the
+  // license explicitly never expires. Size parameter should not include null
+  // termination.
   virtual void OnExpirationChange(const char* session_id,
                                   uint32_t session_id_size,
                                   Time new_expiry_time) = 0;
@@ -978,13 +1061,13 @@ class Host_7 {
   virtual FileIO* CreateFileIO(FileIOClient* client) = 0;
 
  protected:
-  Host_7() {}
-  virtual ~Host_7() {}
+  Host_8() {}
+  virtual ~Host_8() {}
 };
 
-class Host_8 {
+class CDM_CLASS_API Host_9 {
  public:
-  static const int kVersion = 8;
+  static const int kVersion = 9;
 
   // Returns a Buffer* containing non-zero members upon success, or NULL on
   // failure. The caller owns the Buffer* after this call. The buffer is not
@@ -996,9 +1079,14 @@ class Host_8 {
   // from now with |context|.
   virtual void SetTimer(int64_t delay_ms, void* context) = 0;
 
-  // Returns the current wall time in seconds.
+  // Returns the current wall time.
   virtual Time GetCurrentWallTime() = 0;
 
+  // Called by the CDM when a key status is available in response to
+  // GetStatusForPolicy().
+  virtual void OnResolveKeyStatusPromise(uint32_t promise_id,
+                                         KeyStatus key_status) = 0;
+
   // Called by the CDM when a session is created or loaded and the value for the
   // MediaKeySession's sessionId attribute is available (|session_id|).
   // This must be called before OnSessionMessage() or
@@ -1016,26 +1104,21 @@ class Host_8 {
 
   // Called by the CDM when an error occurs as a result of one of the
   // ContentDecryptionModule calls that accept a |promise_id|.
-  // |error| must be specified, |error_message| and |system_code|
+  // |exception| must be specified. |error_message| and |system_code|
   // are optional. |error_message_size| should not include null termination.
   virtual void OnRejectPromise(uint32_t promise_id,
-                               Error error,
+                               Exception exception,
                                uint32_t system_code,
                                const char* error_message,
                                uint32_t error_message_size) = 0;
 
   // Called by the CDM when it has a message for session |session_id|.
   // Size parameters should not include null termination.
-  // |legacy_destination_url| is only for supporting the prefixed EME API and
-  // is ignored by unprefixed EME. It should only be non-null if |message_type|
-  // is kLicenseRenewal.
   virtual void OnSessionMessage(const char* session_id,
                                 uint32_t session_id_size,
                                 MessageType message_type,
                                 const char* message,
-                                uint32_t message_size,
-                                const char* legacy_destination_url,
-                                uint32_t legacy_destination_url_length) = 0;
+                                uint32_t message_size) = 0;
 
   // Called by the CDM when there has been a change in keys or their status for
   // session |session_id|. |has_additional_usable_key| should be set if a
@@ -1054,8 +1137,10 @@ class Host_8 {
   // session |session_id|. This can happen as the result of an Update() call
   // or some other event. If this happens as a result of a call to Update(),
   // it must be called before resolving the Update() promise. |new_expiry_time|
-  // can be 0 to represent "undefined". Size parameter should not include
-  // null termination.
+  // represents the time after which the key(s) in the session will no longer
+  // be usable for decryption. It can be 0 if no such time exists or if the
+  // license explicitly never expires. Size parameter should not include null
+  // termination.
   virtual void OnExpirationChange(const char* session_id,
                                   uint32_t session_id_size,
                                   Time new_expiry_time) = 0;
@@ -1065,21 +1150,6 @@ class Host_8 {
   virtual void OnSessionClosed(const char* session_id,
                                uint32_t session_id_size) = 0;
 
-  // Called by the CDM when an error occurs in session |session_id|
-  // unrelated to one of the ContentDecryptionModule calls that accept a
-  // |promise_id|. |error| must be specified, |error_message| and
-  // |system_code| are optional. Length parameters should not include null
-  // termination.
-  // Note:
-  // - This method is only for supporting prefixed EME API.
-  // - This method will be ignored by unprefixed EME. All errors reported
-  //   in this method should probably also be reported by one of other methods.
-  virtual void OnLegacySessionError(
-      const char* session_id, uint32_t session_id_length,
-      Error error,
-      uint32_t system_code,
-      const char* error_message, uint32_t error_message_length) = 0;
-
   // The following are optional methods that may not be implemented on all
   // platforms.
 
@@ -1114,13 +1184,22 @@ class Host_8 {
   // CDM can call this method multiple times to operate on different files.
   virtual FileIO* CreateFileIO(FileIOClient* client) = 0;
 
+  // Requests a specific version of the storage ID. A storage ID is a stable,
+  // device specific ID used by the CDM to securely store persistent data. The
+  // ID will be returned by the host via ContentDecryptionModule::OnStorageId().
+  // If |version| is 0, the latest version will be returned. All |version|s
+  // that are greater than or equal to 0x80000000 are reserved for the CDM and
+  // should not be supported or returned by the host. The CDM must not expose
+  // the ID outside the client device, even in encrypted form.
+  virtual void RequestStorageId(uint32_t version) = 0;
+
  protected:
-  Host_8() {}
-  virtual ~Host_8() {}
+  Host_9() {}
+  virtual ~Host_9() {}
 };
 
 // Represents a decrypted block that has not been decoded.
-class DecryptedBlock {
+class CDM_CLASS_API DecryptedBlock {
  public:
   virtual void SetDecryptedBuffer(Buffer* buffer) = 0;
   virtual Buffer* DecryptedBuffer() = 0;
@@ -1135,7 +1214,7 @@ class DecryptedBlock {
   virtual ~DecryptedBlock() {}
 };
 
-class VideoFrame {
+class CDM_CLASS_API VideoFrame {
  public:
   enum VideoPlane {
     kYPlane = 0,
@@ -1178,7 +1257,7 @@ class VideoFrame {
 //
 // |<----------------- AudioFrames ------------------>|
 // | audio buffer 0 | audio buffer 1 | audio buffer 2 |
-class AudioFrames {
+class CDM_CLASS_API AudioFrames {
  public:
   virtual void SetFrameBuffer(Buffer* buffer) = 0;
   virtual Buffer* FrameBuffer() = 0;
diff --git a/dom/media/gmp/widevine-adapter/content_decryption_module_export.h b/dom/media/gmp/widevine-adapter/content_decryption_module_export.h
new file mode 100644
index 000000000..51d485892
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/content_decryption_module_export.h
@@ -0,0 +1,22 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_
+#define CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_
+
+// Define CDM_API so that functionality implemented by the CDM module
+// can be exported to consumers.
+#if defined(_WIN32)
+
+#if defined(CDM_IMPLEMENTATION)
+#define CDM_API __declspec(dllexport)
+#else
+#define CDM_API __declspec(dllimport)
+#endif  // defined(CDM_IMPLEMENTATION)
+
+#else  // defined(_WIN32)
+#define CDM_API __attribute__((visibility("default")))
+#endif  // defined(_WIN32)
+
+#endif  // CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_
diff --git a/dom/media/gmp/widevine-adapter/content_decryption_module_ext.h b/dom/media/gmp/widevine-adapter/content_decryption_module_ext.h
new file mode 100644
index 000000000..5df8344e6
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/content_decryption_module_ext.h
@@ -0,0 +1,64 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CDM_CONTENT_DECRYPTION_MODULE_EXT_H_
+#define CDM_CONTENT_DECRYPTION_MODULE_EXT_H_
+
+#if defined(_WIN32)
+#include <windows.h>
+#endif
+
+#include "content_decryption_module_export.h"
+
+#if defined(_MSC_VER)
+typedef unsigned int uint32_t;
+#else
+#include <stdint.h>
+#endif
+
+namespace cdm {
+
+#if defined(_WIN32)
+typedef wchar_t FilePathCharType;
+typedef HANDLE PlatformFile;
+const PlatformFile kInvalidPlatformFile = INVALID_HANDLE_VALUE;
+#else
+typedef char FilePathCharType;
+typedef int PlatformFile;
+const PlatformFile kInvalidPlatformFile = -1;
+#endif  // defined(_WIN32)
+
+struct HostFile {
+  HostFile(const FilePathCharType* file_path,
+           PlatformFile file,
+           PlatformFile sig_file)
+      : file_path(file_path), file(file), sig_file(sig_file) {}
+
+  // File that is part of the host of the CDM.
+  const FilePathCharType* file_path = nullptr;
+  PlatformFile file = kInvalidPlatformFile;
+
+  // Signature file for |file|.
+  PlatformFile sig_file = kInvalidPlatformFile;
+};
+
+}  // namespace cdm
+
+extern "C" {
+
+// Functions in this file are dynamically retrieved by their versioned function
+// names. Increment the version number for any backward incompatible API
+// changes.
+
+// Verifies CDM host. All files in |host_files| are opened in read-only mode.
+//
+// Returns false and closes all files if there is an immediate failure.
+// Otherwise returns true as soon as possible and processes the files
+// asynchronously. All files MUST be closed by the CDM after this one-time
+// processing is finished.
+CDM_API bool VerifyCdmHost_0(const cdm::HostFile* host_files,
+                             uint32_t num_files);
+}
+
+#endif  // CDM_CONTENT_DECRYPTION_MODULE_EXT_H_
diff --git a/dom/media/gtest/Cargo.toml b/dom/media/gtest/Cargo.toml
deleted file mode 100644
index a55f8fb68..000000000
--- a/dom/media/gtest/Cargo.toml
+++ /dev/null
@@ -1,7 +0,0 @@
-[package]
-name = "mp4parse-gtest"
-version = "0.1.0"
-authors = ["nobody@mozilla.org"]
-
-[lib]
-path = "hello.rs"
diff --git a/dom/media/gtest/TestMP3Demuxer.cpp b/dom/media/gtest/TestMP3Demuxer.cpp
index 8d2109f00..934acb60e 100644
--- a/dom/media/gtest/TestMP3Demuxer.cpp
+++ b/dom/media/gtest/TestMP3Demuxer.cpp
@@ -11,7 +11,6 @@
 #include "MockMediaResource.h"
 
 using namespace mozilla;
-using namespace mozilla::mp3;
 using media::TimeUnit;
 
 
diff --git a/dom/media/gtest/TestMP4Reader.cpp b/dom/media/gtest/TestMP4Reader.cpp
deleted file mode 100644
index f08f7a40d..000000000
--- a/dom/media/gtest/TestMP4Reader.cpp
+++ /dev/null
@@ -1,217 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "gtest/gtest.h"
-#include "MP4Reader.h"
-#include "MP4Decoder.h"
-#include "mozilla/SharedThreadPool.h"
-#include "MockMediaResource.h"
-#include "MockMediaDecoderOwner.h"
-#include "mozilla/Preferences.h"
-#include "TimeUnits.h"
-
-using namespace mozilla;
-using namespace mozilla::dom;
-
-class TestBinding
-{
-public:
-  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(TestBinding);
-
-  RefPtr<MP4Decoder> decoder;
-  RefPtr<MockMediaResource> resource;
-  RefPtr<MP4Reader> reader;
-
-  explicit TestBinding(const char* aFileName = "gizmo.mp4")
-    : decoder(new MP4Decoder())
-    , resource(new MockMediaResource(aFileName))
-    , reader(new MP4Reader(decoder))
-  {
-    EXPECT_EQ(NS_OK, Preferences::SetBool(
-                       "media.use-blank-decoder", true));
-
-    EXPECT_EQ(NS_OK, resource->Open(nullptr));
-    decoder->SetResource(resource);
-
-    reader->Init(nullptr);
-    // This needs to be done before invoking GetBuffered. This is normally
-    // done by MediaDecoderStateMachine.
-    reader->DispatchSetStartTime(0);
-  }
-
-  void Init() {
-    nsCOMPtr<nsIThread> thread;
-    nsCOMPtr<nsIRunnable> r = NewRunnableMethod(this, &TestBinding::ReadMetadata);
-    nsresult rv = NS_NewThread(getter_AddRefs(thread), r);
-    EXPECT_EQ(NS_OK, rv);
-    thread->Shutdown();
-  }
-
-private:
-  virtual ~TestBinding()
-  {
-    {
-      RefPtr<TaskQueue> queue = reader->OwnerThread();
-      nsCOMPtr<nsIRunnable> task = NewRunnableMethod(reader, &MP4Reader::Shutdown);
-      // Hackily bypass the tail dispatcher so that we can AwaitShutdownAndIdle.
-      // In production code we'd use BeginShutdown + promises.
-      queue->Dispatch(task.forget(), AbstractThread::AssertDispatchSuccess,
-                      AbstractThread::TailDispatch);
-      queue->AwaitShutdownAndIdle();
-    }
-    decoder = nullptr;
-    resource = nullptr;
-    reader = nullptr;
-    SharedThreadPool::SpinUntilEmpty();
-  }
-
-  void ReadMetadata()
-  {
-    MediaInfo info;
-    MetadataTags* tags;
-    EXPECT_EQ(NS_OK, reader->ReadMetadata(&info, &tags));
-  }
-};
-
-TEST(MP4Reader, BufferedRange)
-{
-  RefPtr<TestBinding> b = new TestBinding();
-  b->Init();
-
-  // Video 3-4 sec, audio 2.986666-4.010666 sec
-  b->resource->MockAddBufferedRange(248400, 327455);
-
-  media::TimeIntervals ranges = b->reader->GetBuffered();
-  EXPECT_EQ(1U, ranges.Length());
-  EXPECT_NEAR(270000 / 90000.0, ranges.Start(0).ToSeconds(), 0.000001);
-  EXPECT_NEAR(360000 / 90000.0, ranges.End(0).ToSeconds(), 0.000001);
-}
-
-TEST(MP4Reader, BufferedRangeMissingLastByte)
-{
-  RefPtr<TestBinding> b = new TestBinding();
-  b->Init();
-
-  // Dropping the last byte of the video
-  b->resource->MockClearBufferedRanges();
-  b->resource->MockAddBufferedRange(248400, 324912);
-  b->resource->MockAddBufferedRange(324913, 327455);
-
-  media::TimeIntervals ranges = b->reader->GetBuffered();
-  EXPECT_EQ(1U, ranges.Length());
-  EXPECT_NEAR(270000.0 / 90000.0, ranges.Start(0).ToSeconds(), 0.000001);
-  EXPECT_NEAR(357000 / 90000.0, ranges.End(0).ToSeconds(), 0.000001);
-}
-
-TEST(MP4Reader, BufferedRangeSyncFrame)
-{
-  RefPtr<TestBinding> b = new TestBinding();
-  b->Init();
-
-  // Check that missing the first byte at 2 seconds skips right through to 3
-  // seconds because of a missing sync frame
-  b->resource->MockClearBufferedRanges();
-  b->resource->MockAddBufferedRange(146336, 327455);
-
-  media::TimeIntervals ranges = b->reader->GetBuffered();
-  EXPECT_EQ(1U, ranges.Length());
-  EXPECT_NEAR(270000.0 / 90000.0, ranges.Start(0).ToSeconds(), 0.000001);
-  EXPECT_NEAR(360000 / 90000.0, ranges.End(0).ToSeconds(), 0.000001);
-}
-
-TEST(MP4Reader, CompositionOrder)
-{
-  RefPtr<TestBinding> b = new TestBinding("mediasource_test.mp4");
-  b->Init();
-
-  // The first 5 video samples of this file are:
-  // Video timescale=2500
-  // Frame Start  Size  Time  Duration  Sync
-  //     1    48  5455   166        83  Yes
-  //     2  5503   145   249        83
-  //     3  6228   575   581        83
-  //     4  7383   235   415        83
-  //     5  8779   183   332        83
-  //     6  9543   191   498        83
-  //
-  // Audio timescale=44100
-  //     1  5648   580     0      1024  Yes
-  //     2  6803   580  1024      1058  Yes
-  //     3  7618   581  2082      1014  Yes
-  //     4  8199   580  3096      1015  Yes
-  //     5  8962   581  4111      1014  Yes
-  //     6  9734   580  5125      1014  Yes
-  //     7 10314   581  6139      1059  Yes
-  //     8 11207   580  7198      1014  Yes
-  //     9 12035   581  8212      1014  Yes
-  //    10 12616   580  9226      1015  Yes
-  //    11 13220   581  10241     1014  Yes
-
-  b->resource->MockClearBufferedRanges();
-  // First two frames in decoding + first audio frame
-  b->resource->MockAddBufferedRange(48, 5503);   // Video 1
-  b->resource->MockAddBufferedRange(5503, 5648); // Video 2
-  b->resource->MockAddBufferedRange(6228, 6803); // Video 3
-
-  // Audio - 5 frames; 0 - 139206 us
-  b->resource->MockAddBufferedRange(5648, 6228);
-  b->resource->MockAddBufferedRange(6803, 7383);
-  b->resource->MockAddBufferedRange(7618, 8199);
-  b->resource->MockAddBufferedRange(8199, 8779);
-  b->resource->MockAddBufferedRange(8962, 9563);
-  b->resource->MockAddBufferedRange(9734, 10314);
-  b->resource->MockAddBufferedRange(10314, 10895);
-  b->resource->MockAddBufferedRange(11207, 11787);
-  b->resource->MockAddBufferedRange(12035, 12616);
-  b->resource->MockAddBufferedRange(12616, 13196);
-  b->resource->MockAddBufferedRange(13220, 13901);
-
-  media::TimeIntervals ranges = b->reader->GetBuffered();
-  EXPECT_EQ(2U, ranges.Length());
-
-  EXPECT_NEAR(166.0 / 2500.0, ranges.Start(0).ToSeconds(), 0.000001);
-  EXPECT_NEAR(332.0 / 2500.0, ranges.End(0).ToSeconds(), 0.000001);
-
-  EXPECT_NEAR(581.0 / 2500.0, ranges.Start(1).ToSeconds(), 0.000001);
-  EXPECT_NEAR(11255.0 / 44100.0, ranges.End(1).ToSeconds(), 0.000001);
-}
-
-TEST(MP4Reader, Normalised)
-{
-  RefPtr<TestBinding> b = new TestBinding("mediasource_test.mp4");
-  b->Init();
-
-  // The first 5 video samples of this file are:
-  // Video timescale=2500
-  // Frame Start  Size  Time  Duration  Sync
-  //     1    48  5455   166        83  Yes
-  //     2  5503   145   249        83
-  //     3  6228   575   581        83
-  //     4  7383   235   415        83
-  //     5  8779   183   332        83
-  //     6  9543   191   498        83
-  //
-  // Audio timescale=44100
-  //     1  5648   580     0      1024  Yes
-  //     2  6803   580  1024      1058  Yes
-  //     3  7618   581  2082      1014  Yes
-  //     4  8199   580  3096      1015  Yes
-  //     5  8962   581  4111      1014  Yes
-  //     6  9734   580  5125      1014  Yes
-  //     7 10314   581  6139      1059  Yes
-  //     8 11207   580  7198      1014  Yes
-  //     9 12035   581  8212      1014  Yes
-  //    10 12616   580  9226      1015  Yes
-  //    11 13220   581  10241     1014  Yes
-
-  b->resource->MockClearBufferedRanges();
-  b->resource->MockAddBufferedRange(48, 13901);
-
-  media::TimeIntervals ranges = b->reader->GetBuffered();
-  EXPECT_EQ(1U, ranges.Length());
-
-  EXPECT_NEAR(166.0 / 2500.0, ranges.Start(0).ToSeconds(), 0.000001);
-  EXPECT_NEAR(11255.0 / 44100.0, ranges.End(0).ToSeconds(), 0.000001);
-}
diff --git a/dom/media/gtest/TestRust.cpp b/dom/media/gtest/TestRust.cpp
deleted file mode 100644
index 86d0e99b8..000000000
--- a/dom/media/gtest/TestRust.cpp
+++ /dev/null
@@ -1,9 +0,0 @@
-#include <stdint.h>
-#include "gtest/gtest.h"
-
-extern "C" uint8_t* test_rust();
-
-TEST(rust, CallFromCpp) {
-  auto greeting = test_rust();
-  EXPECT_STREQ(reinterpret_cast<char*>(greeting), "hello from rust.");
-}
diff --git a/dom/media/gtest/hello.rs b/dom/media/gtest/hello.rs
deleted file mode 100644
index cd111882a..000000000
--- a/dom/media/gtest/hello.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-#[no_mangle]
-pub extern fn test_rust() -> *const u8 {
-    // NB: rust &str aren't null terminated.
-    let greeting = "hello from rust.\0";
-    greeting.as_ptr()
-}
diff --git a/dom/media/gtest/moz.build b/dom/media/gtest/moz.build
index d5d02bced..a7ea73807 100644
--- a/dom/media/gtest/moz.build
+++ b/dom/media/gtest/moz.build
@@ -21,7 +21,6 @@ UNIFIED_SOURCES += [
     'TestMozPromise.cpp',
     'TestMP3Demuxer.cpp',
     'TestMP4Demuxer.cpp',
-    # 'TestMP4Reader.cpp', disabled so we can turn check tests back on (bug 1175752)
     'TestTrackEncoder.cpp',
     'TestVideoSegment.cpp',
     'TestVideoUtils.cpp',
diff --git a/dom/media/mediasource/MediaSource.cpp b/dom/media/mediasource/MediaSource.cpp
index af541bbbb..152c0085a 100644
--- a/dom/media/mediasource/MediaSource.cpp
+++ b/dom/media/mediasource/MediaSource.cpp
@@ -62,8 +62,6 @@ namespace mozilla {
 
 // Returns true if we should enable MSE webm regardless of preferences.
 // 1. If MP4/H264 isn't supported:
-//   * Windows XP
-//   * Windows Vista and Server 2008 without the optional "Platform Update Supplement"
 //   * N/KN editions (Europe and Korea) of Windows 7/8/8.1/10 without the
 //     optional "Windows Media Feature Pack"
 // 2. If H264 hardware acceleration is not available.
diff --git a/dom/media/mediasource/moz.build b/dom/media/mediasource/moz.build
index 6ded1875d..a1689c216 100644
--- a/dom/media/mediasource/moz.build
+++ b/dom/media/mediasource/moz.build
@@ -38,9 +38,6 @@ TEST_DIRS += [
     'gtest',
 ]
 
-if CONFIG['MOZ_GONK_MEDIACODEC']:
-    DEFINES['MOZ_GONK_MEDIACODEC'] = True
-
 include('/ipc/chromium/chromium-config.mozbuild')
 
 FINAL_LIBRARY = 'xul'
diff --git a/dom/media/moz.build b/dom/media/moz.build
index 4d036a5f6..df8cb619d 100644
--- a/dom/media/moz.build
+++ b/dom/media/moz.build
@@ -30,6 +30,7 @@ DIRS += [
     'ipc',
     'mediasink',
     'mediasource',
+    'mp3',
     'ogg',
     'platforms',
     'systemservices',
@@ -42,12 +43,6 @@ DIRS += [
     'standalone',
 ]
 
-if CONFIG['MOZ_DIRECTSHOW']:
-    DIRS += ['directshow']
-
-if CONFIG['MOZ_ANDROID_OMX']:
-    DIRS += ['android']
-
 if CONFIG['MOZ_FMP4']:
     DIRS += ['fmp4']
 
@@ -128,9 +123,6 @@ EXPORTS += [
     'MediaTimer.h',
     'MediaTrack.h',
     'MediaTrackList.h',
-    'MP3Decoder.h',
-    'MP3Demuxer.h',
-    'MP3FrameParser.h',
     'NextFrameSeekTask.h',
     'nsIDocumentActivity.h',
     'PrincipalChangeObserver.h',
@@ -237,9 +229,6 @@ UNIFIED_SOURCES += [
     'MediaTimer.cpp',
     'MediaTrack.cpp',
     'MediaTrackList.cpp',
-    'MP3Decoder.cpp',
-    'MP3Demuxer.cpp',
-    'MP3FrameParser.cpp',
     'NextFrameSeekTask.cpp',
     'QueueObject.cpp',
     'SeekJob.cpp',
@@ -294,11 +283,6 @@ LOCAL_INCLUDES += [
     '/netwerk/base',
 ]
 
-if CONFIG['MOZ_DIRECTSHOW']:
-    LOCAL_INCLUDES += [
-        '/media/webrtc/trunk/webrtc/modules/video_capture/windows',
-    ]
-
 if CONFIG['MOZ_WEBRTC']:
     LOCAL_INCLUDES += [
         '/media/webrtc/signaling/src/common',
diff --git a/dom/media/MP3Decoder.cpp b/dom/media/mp3/MP3Decoder.cpp
index b71111e79..074a0866d 100644
--- a/dom/media/MP3Decoder.cpp
+++ b/dom/media/mp3/MP3Decoder.cpp
@@ -24,7 +24,7 @@ MP3Decoder::Clone(MediaDecoderOwner* aOwner) {
 MediaDecoderStateMachine*
 MP3Decoder::CreateStateMachine() {
   RefPtr<MediaDecoderReader> reader =
-      new MediaFormatReader(this, new mp3::MP3Demuxer(GetResource()));
+      new MediaFormatReader(this, new MP3Demuxer(GetResource()));
   return new MediaDecoderStateMachine(this, reader);
 }
 
diff --git a/dom/media/MP3Decoder.h b/dom/media/mp3/MP3Decoder.h
index 887251065..887251065 100644
--- a/dom/media/MP3Decoder.h
+++ b/dom/media/mp3/MP3Decoder.h
diff --git a/dom/media/MP3Demuxer.cpp b/dom/media/mp3/MP3Demuxer.cpp
index 7d478a41b..5a98cabfe 100644
--- a/dom/media/MP3Demuxer.cpp
+++ b/dom/media/mp3/MP3Demuxer.cpp
@@ -33,7 +33,6 @@ using mozilla::media::TimeIntervals;
 using mp4_demuxer::ByteReader;
 
 namespace mozilla {
-namespace mp3 {
 
 // MP3Demuxer
 
@@ -1338,5 +1337,4 @@ ID3Parser::ID3Header::Update(uint8_t c) {
   return IsValid(mPos++);
 }
 
-} // namespace mp3
 } // namespace mozilla
diff --git a/dom/media/MP3Demuxer.h b/dom/media/mp3/MP3Demuxer.h
index 03e67b0d9..5331c4d54 100644
--- a/dom/media/MP3Demuxer.h
+++ b/dom/media/mp3/MP3Demuxer.h
@@ -13,7 +13,6 @@
 #include <vector>
 
 namespace mozilla {
-namespace mp3 {
 
 class MP3TrackDemuxer;
 
@@ -468,7 +467,6 @@ private:
   UniquePtr<AudioInfo> mInfo;
 };
 
-} // namespace mp3
 } // namespace mozilla
 
 #endif
diff --git a/dom/media/mp3/moz.build b/dom/media/mp3/moz.build
new file mode 100644
index 000000000..596d061f8
--- /dev/null
+++ b/dom/media/mp3/moz.build
@@ -0,0 +1,17 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXPORTS += [
+    'MP3Decoder.h',
+    'MP3Demuxer.h',
+]
+
+UNIFIED_SOURCES += [
+    'MP3Decoder.cpp',
+    'MP3Demuxer.cpp',
+]
+
+FINAL_LIBRARY = 'xul'
diff --git a/dom/media/ogg/OggDemuxer.cpp b/dom/media/ogg/OggDemuxer.cpp
index 591a5248f..0cc484687 100644
--- a/dom/media/ogg/OggDemuxer.cpp
+++ b/dom/media/ogg/OggDemuxer.cpp
@@ -12,7 +12,6 @@
 #include "mozilla/Atomics.h"
 #include "mozilla/PodOperations.h"
 #include "mozilla/SharedThreadPool.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/TimeStamp.h"
 #include "MediaDataDemuxer.h"
 #include "nsAutoRef.h"
@@ -164,7 +163,6 @@ OggDemuxer::~OggDemuxer()
       MOZ_LOG(gMediaDemuxerLog, mozilla::LogLevel::Debug,
               ("OggDemuxer(%p)::%s: Reporting telemetry MEDIA_OGG_LOADED_IS_CHAINED=%d",
                ptr, __func__, isChained));
-      Telemetry::Accumulate(Telemetry::ID::MEDIA_OGG_LOADED_IS_CHAINED, isChained);
     });
     AbstractThread::MainThread()->Dispatch(task.forget());
   }
diff --git a/dom/media/platforms/MediaTelemetryConstants.h b/dom/media/platforms/MediaTelemetryConstants.h
deleted file mode 100644
index 5024949a8..000000000
--- a/dom/media/platforms/MediaTelemetryConstants.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-#ifndef dom_media_platforms_MediaTelemetryConstants_h___
-#define dom_media_platforms_MediaTelemetryConstants_h___
-
-namespace mozilla {
-namespace media {
-
-enum class MediaDecoderBackend : uint32_t
-{
-  WMFSoftware = 0,
-  WMFDXVA2D3D9 = 1,
-  WMFDXVA2D3D11 = 2
-};
-
-} // namespace media
-} // namespace mozilla
-
-#endif // dom_media_platforms_MediaTelemetryConstants_h___
diff --git a/dom/media/platforms/PDMFactory.cpp b/dom/media/platforms/PDMFactory.cpp
index c1e58fdc2..5bfdcffb7 100644
--- a/dom/media/platforms/PDMFactory.cpp
+++ b/dom/media/platforms/PDMFactory.cpp
@@ -19,9 +19,6 @@
 #ifdef MOZ_APPLEMEDIA
 #include "AppleDecoderModule.h"
 #endif
-#ifdef MOZ_GONK_MEDIACODEC
-#include "GonkDecoderModule.h"
-#endif
 #ifdef MOZ_WIDGET_ANDROID
 #include "AndroidDecoderModule.h"
 #endif
@@ -390,12 +387,6 @@ PDMFactory::CreatePDMs()
   m = new AppleDecoderModule();
   StartupPDM(m);
 #endif
-#ifdef MOZ_GONK_MEDIACODEC
-  if (MediaPrefs::PDMGonkDecoderEnabled()) {
-    m = new GonkDecoderModule();
-    StartupPDM(m);
-  }
-#endif
 #ifdef MOZ_WIDGET_ANDROID
   if(MediaPrefs::PDMAndroidMediaCodecEnabled()){
     m = new AndroidDecoderModule();
diff --git a/dom/media/platforms/agnostic/AOMDecoder.cpp b/dom/media/platforms/agnostic/AOMDecoder.cpp
new file mode 100644
index 000000000..b5d21375e
--- /dev/null
+++ b/dom/media/platforms/agnostic/AOMDecoder.cpp
@@ -0,0 +1,332 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "AOMDecoder.h"
+#include "MediaResult.h"
+#include "TimeUnits.h"
+#include "aom/aomdx.h"
+#include "aom/aom_image.h"
+#include "gfx2DGlue.h"
+#include "mozilla/PodOperations.h"
+#include "mozilla/SyncRunnable.h"
+#include "nsError.h"
+#include "prsystem.h"
+
+#include <algorithm>
+
+#undef LOG
+#define LOG(arg, ...) MOZ_LOG(sPDMLog, mozilla::LogLevel::Debug, ("AOMDecoder(%p)::%s: " arg, this, __func__, ##__VA_ARGS__))
+
+namespace mozilla {
+
+using namespace gfx;
+using namespace layers;
+
+AOMDecoder::AOMDecoder(const CreateDecoderParams& aParams)
+  : mImageContainer(aParams.mImageContainer)
+  , mTaskQueue(aParams.mTaskQueue)
+  , mCallback(aParams.mCallback)
+  , mIsFlushing(false)
+  , mInfo(aParams.VideoConfig())
+{
+  PodZero(&mCodec);
+}
+
+AOMDecoder::~AOMDecoder()
+{
+}
+
+void
+AOMDecoder::Shutdown()
+{
+  aom_codec_destroy(&mCodec);
+}
+
+RefPtr<MediaDataDecoder::InitPromise>
+AOMDecoder::Init()
+{
+  int decode_threads = 2;
+
+  aom_codec_iface_t* dx = aom_codec_av1_dx();
+  if (mInfo.mDisplay.width >= 2048) {
+    decode_threads = 8;
+  }
+  else if (mInfo.mDisplay.width >= 1024) {
+    decode_threads = 4;
+  }
+  decode_threads = std::min(decode_threads, PR_GetNumberOfProcessors());
+
+  aom_codec_dec_cfg_t config;
+  PodZero(&config);
+  config.threads = decode_threads;
+  config.w = config.h = 0; // set after decode
+  config.allow_lowbitdepth = true;
+
+  aom_codec_flags_t flags = 0;
+  
+  if (!dx || aom_codec_dec_init(&mCodec, dx, &config, flags)) {
+    return InitPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_FATAL_ERR, __func__);
+  }
+  return InitPromise::CreateAndResolve(TrackInfo::kVideoTrack, __func__);
+}
+
+void
+AOMDecoder::Flush()
+{
+  MOZ_ASSERT(mCallback->OnReaderTaskQueue());
+  mIsFlushing = true;
+  nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction([this] () {
+    // nothing to do for now.
+  });
+  SyncRunnable::DispatchToThread(mTaskQueue, r);
+  mIsFlushing = false;
+}
+
+// Ported from third_party/aom/tools_common.c.
+static aom_codec_err_t
+highbd_img_downshift(aom_image_t *dst, aom_image_t *src, int down_shift) {
+  int plane;
+  if (dst->d_w != src->d_w || dst->d_h != src->d_h)
+    return AOM_CODEC_INVALID_PARAM;
+  if (dst->x_chroma_shift != src->x_chroma_shift)
+    return AOM_CODEC_INVALID_PARAM;
+  if (dst->y_chroma_shift != src->y_chroma_shift)
+    return AOM_CODEC_INVALID_PARAM;
+  if (dst->fmt != (src->fmt & ~AOM_IMG_FMT_HIGHBITDEPTH))
+    return AOM_CODEC_INVALID_PARAM;
+  if (down_shift < 0)
+      return AOM_CODEC_INVALID_PARAM;
+  switch (dst->fmt) {
+    case AOM_IMG_FMT_I420:
+    case AOM_IMG_FMT_I422:
+    case AOM_IMG_FMT_I444:
+      break;
+    default:
+      return AOM_CODEC_INVALID_PARAM;
+  }
+  switch (src->fmt) {
+    case AOM_IMG_FMT_I42016:
+    case AOM_IMG_FMT_I42216:
+    case AOM_IMG_FMT_I44416:
+      break;
+    default:
+      // We don't support anything that's not 16 bit
+      return AOM_CODEC_UNSUP_BITSTREAM;
+  }
+  for (plane = 0; plane < 3; plane++) {
+    int w = src->d_w;
+    int h = src->d_h;
+    int x, y;
+    if (plane) {
+      w = (w + src->x_chroma_shift) >> src->x_chroma_shift;
+      h = (h + src->y_chroma_shift) >> src->y_chroma_shift;
+    }
+    for (y = 0; y < h; y++) {
+      uint16_t *p_src =
+          (uint16_t *)(src->planes[plane] + y * src->stride[plane]);
+      uint8_t *p_dst =
+          dst->planes[plane] + y * dst->stride[plane];
+      for (x = 0; x < w; x++) *p_dst++ = (*p_src++ >> down_shift) & 0xFF;
+    }
+  }
+  return AOM_CODEC_OK;
+}
+
+// UniquePtr dtor wrapper for aom_image_t.
+struct AomImageFree {
+  void operator()(aom_image_t* img) { aom_img_free(img); }
+};
+
+MediaResult
+AOMDecoder::DoDecode(MediaRawData* aSample)
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+
+#if defined(DEBUG)
+  NS_ASSERTION(IsKeyframe(*aSample) == aSample->mKeyframe,
+               "AOM Decode Keyframe error sample->mKeyframe and si.si_kf out of sync");
+#endif
+
+  if (aom_codec_err_t r = aom_codec_decode(&mCodec, aSample->Data(), aSample->Size(), nullptr)) {
+    LOG("AOM Decode error: %s", aom_codec_err_to_string(r));
+    return MediaResult(
+      NS_ERROR_DOM_MEDIA_DECODE_ERR,
+      RESULT_DETAIL("AOM error decoding AV1 sample: %s", aom_codec_err_to_string(r)));
+  }
+
+  aom_codec_iter_t iter = nullptr;
+  aom_image_t *img;
+  UniquePtr<aom_image_t, AomImageFree> img8;
+
+  while ((img = aom_codec_get_frame(&mCodec, &iter))) {
+    // Track whether the underlying buffer is 8 or 16 bits per channel.
+    bool highbd = bool(img->fmt & AOM_IMG_FMT_HIGHBITDEPTH);
+    if (highbd) {
+      // Downsample images with more than 8 bits per channel.
+      aom_img_fmt_t fmt8 = static_cast<aom_img_fmt_t>(img->fmt ^ AOM_IMG_FMT_HIGHBITDEPTH);
+      img8.reset(aom_img_alloc(NULL, fmt8, img->d_w, img->d_h, 16));
+      if (img8 == nullptr) {
+        LOG("Couldn't allocate bitdepth reduction target!");
+        return MediaResult(
+          NS_ERROR_OUT_OF_MEMORY,
+          RESULT_DETAIL("Couldn't allocate conversion buffer for AV1 frame"));
+      }
+      if (aom_codec_err_t r = highbd_img_downshift(img8.get(), img, img->bit_depth - 8)) {
+        return MediaResult(
+          NS_ERROR_DOM_MEDIA_DECODE_ERR,
+          RESULT_DETAIL("Error converting AV1 frame to 8 bits: %s",
+                        aom_codec_err_to_string(r)));
+      }
+      // img normally points to storage owned by mCodec, so it is not freed.
+      // To copy out the contents of img8 we can overwrite img with an alias.
+      // Since img is assigned at the start of the while loop and img8 is held
+      // outside that loop, the alias won't outlive the storage it points to.
+      img = img8.get();
+      highbd = false;
+    }
+
+    NS_ASSERTION(img->fmt == AOM_IMG_FMT_I420 ||
+                 img->fmt == AOM_IMG_FMT_I42016 ||
+                 img->fmt == AOM_IMG_FMT_I444 ||
+                 img->fmt == AOM_IMG_FMT_I44416,
+                 "AV1 image format not I420 or I444");
+
+    // Chroma shifts are rounded down as per the decoding examples in the SDK
+    VideoData::YCbCrBuffer b;
+    b.mPlanes[0].mData = img->planes[0];
+    b.mPlanes[0].mStride = img->stride[0];
+    b.mPlanes[0].mHeight = img->d_h;
+    b.mPlanes[0].mWidth = img->d_w;
+    b.mPlanes[0].mOffset = 0;
+    b.mPlanes[0].mSkip = highbd ? 1 : 0;
+
+    b.mPlanes[1].mData = img->planes[1];
+    b.mPlanes[1].mStride = img->stride[1];
+    b.mPlanes[1].mOffset = 0;
+    b.mPlanes[1].mSkip = highbd ? 1 : 0;
+
+    b.mPlanes[2].mData = img->planes[2];
+    b.mPlanes[2].mStride = img->stride[2];
+    b.mPlanes[2].mOffset = 0;
+    b.mPlanes[2].mSkip = highbd ? 1 : 0;
+
+    if (img->fmt == AOM_IMG_FMT_I420 ||
+        img->fmt == AOM_IMG_FMT_I42016) {
+      b.mPlanes[1].mHeight = (img->d_h + 1) >> img->y_chroma_shift;
+      b.mPlanes[1].mWidth = (img->d_w + 1) >> img->x_chroma_shift;
+
+      b.mPlanes[2].mHeight = (img->d_h + 1) >> img->y_chroma_shift;
+      b.mPlanes[2].mWidth = (img->d_w + 1) >> img->x_chroma_shift;
+    } else if (img->fmt == AOM_IMG_FMT_I444) {
+      b.mPlanes[1].mHeight = img->d_h;
+      b.mPlanes[1].mWidth = img->d_w;
+
+      b.mPlanes[2].mHeight = img->d_h;
+      b.mPlanes[2].mWidth = img->d_w;
+    } else {
+      LOG("AOM Unknown image format");
+      return MediaResult(NS_ERROR_DOM_MEDIA_DECODE_ERR,
+                         RESULT_DETAIL("AOM Unknown image format"));
+    }
+
+    RefPtr<VideoData> v =
+      VideoData::CreateAndCopyData(mInfo,
+                                   mImageContainer,
+                                   aSample->mOffset,
+                                   aSample->mTime,
+                                   aSample->mDuration,
+                                   b,
+                                   aSample->mKeyframe,
+                                   aSample->mTimecode,
+                                   mInfo.ScaledImageRect(img->d_w,
+                                                         img->d_h));
+
+    if (!v) {
+      LOG("Image allocation error source %ux%u display %ux%u picture %ux%u",
+          img->d_w, img->d_h, mInfo.mDisplay.width, mInfo.mDisplay.height,
+          mInfo.mImage.width, mInfo.mImage.height);
+      return MediaResult(NS_ERROR_OUT_OF_MEMORY, __func__);
+    }
+    mCallback->Output(v);
+  }
+  return NS_OK;
+}
+
+void
+AOMDecoder::ProcessDecode(MediaRawData* aSample)
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+  if (mIsFlushing) {
+    return;
+  }
+  MediaResult rv = DoDecode(aSample);
+  if (NS_FAILED(rv)) {
+    mCallback->Error(rv);
+  } else {
+    mCallback->InputExhausted();
+  }
+}
+
+void
+AOMDecoder::Input(MediaRawData* aSample)
+{
+  MOZ_ASSERT(mCallback->OnReaderTaskQueue());
+  mTaskQueue->Dispatch(NewRunnableMethod<RefPtr<MediaRawData>>(
+                       this, &AOMDecoder::ProcessDecode, aSample));
+}
+
+void
+AOMDecoder::ProcessDrain()
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+  mCallback->DrainComplete();
+}
+
+void
+AOMDecoder::Drain()
+{
+  MOZ_ASSERT(mCallback->OnReaderTaskQueue());
+  mTaskQueue->Dispatch(NewRunnableMethod(this, &AOMDecoder::ProcessDrain));
+}
+
+/* static */
+bool
+AOMDecoder::IsAV1(const nsACString& aMimeType)
+{
+  return aMimeType.EqualsLiteral("video/webm; codecs=av1") ||
+         aMimeType.EqualsLiteral("video/av1");
+}
+
+/* static */
+bool
+AOMDecoder::IsKeyframe(Span<const uint8_t> aBuffer) {
+  aom_codec_stream_info_t info;
+  PodZero(&info);
+
+  aom_codec_peek_stream_info(aom_codec_av1_dx(),
+                             aBuffer.Elements(),
+                             aBuffer.Length(),
+                             &info);
+
+  return bool(info.is_kf);
+}
+
+/* static */
+nsIntSize
+AOMDecoder::GetFrameSize(Span<const uint8_t> aBuffer) {
+  aom_codec_stream_info_t info;
+  PodZero(&info);
+
+  aom_codec_peek_stream_info(aom_codec_av1_dx(),
+                             aBuffer.Elements(),
+                             aBuffer.Length(),
+                             &info);
+
+  return nsIntSize(info.w, info.h);
+}
+
+} // namespace mozilla
+#undef LOG
diff --git a/dom/media/platforms/agnostic/AOMDecoder.h b/dom/media/platforms/agnostic/AOMDecoder.h
new file mode 100644
index 000000000..ec6b1f95a
--- /dev/null
+++ b/dom/media/platforms/agnostic/AOMDecoder.h
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if !defined(AOMDecoder_h_)
+#define AOMDecoder_h_
+
+#include "PlatformDecoderModule.h"
+#include "mozilla/Span.h"
+
+#include <stdint.h>
+#include "aom/aom_decoder.h"
+
+namespace mozilla {
+
+class AOMDecoder : public MediaDataDecoder
+{
+public:
+  explicit AOMDecoder(const CreateDecoderParams& aParams);
+
+  RefPtr<InitPromise> Init() override;
+  void Input(MediaRawData* aSample) override;
+  void Flush() override;
+  void Drain() override;
+  void Shutdown() override;
+  const char* GetDescriptionName() const override
+  {
+    return "libaom (AV1) video decoder";
+  }
+
+  // Return true if aMimeType is a one of the strings used
+  // by our demuxers to identify AV1 streams.
+  static bool IsAV1(const nsACString& aMimeType);
+
+  // Return true if a sample is a keyframe.
+  static bool IsKeyframe(Span<const uint8_t> aBuffer);
+
+  // Return the frame dimensions for a sample.
+  static nsIntSize GetFrameSize(Span<const uint8_t> aBuffer);
+
+private:
+  ~AOMDecoder();
+  void ProcessDecode(MediaRawData* aSample);
+  MediaResult DoDecode(MediaRawData* aSample);
+  void ProcessDrain();
+
+  const RefPtr<layers::ImageContainer> mImageContainer;
+  const RefPtr<TaskQueue> mTaskQueue;
+  MediaDataDecoderCallback* mCallback;
+  Atomic<bool> mIsFlushing;
+
+  // AOM decoder state
+  aom_codec_ctx_t mCodec;
+
+  const VideoInfo& mInfo;
+};
+
+} // namespace mozilla
+
+#endif // AOMDecoder_h_
diff --git a/dom/media/platforms/agnostic/AgnosticDecoderModule.cpp b/dom/media/platforms/agnostic/AgnosticDecoderModule.cpp
index 7bd75b7fe..cf5ed3d22 100644
--- a/dom/media/platforms/agnostic/AgnosticDecoderModule.cpp
+++ b/dom/media/platforms/agnostic/AgnosticDecoderModule.cpp
@@ -5,6 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "AgnosticDecoderModule.h"
+#include "MediaPrefs.h"
 #include "mozilla/Logging.h"
 #include "OpusDecoder.h"
 #include "VorbisDecoder.h"
@@ -12,6 +13,10 @@
 #include "WAVDecoder.h"
 #include "TheoraDecoder.h"
 
+#ifdef MOZ_AV1
+#include "AOMDecoder.h"
+#endif
+
 namespace mozilla {
 
 bool
@@ -24,6 +29,11 @@ AgnosticDecoderModule::SupportsMimeType(const nsACString& aMimeType,
     VorbisDataDecoder::IsVorbis(aMimeType) ||
     WaveDataDecoder::IsWave(aMimeType) ||
     TheoraDecoder::IsTheora(aMimeType);
+#ifdef MOZ_AV1
+  if (MediaPrefs::AV1Enabled()) {
+    supports |= AOMDecoder::IsAV1(aMimeType);
+  }
+#endif
   MOZ_LOG(sPDMLog, LogLevel::Debug, ("Agnostic decoder %s requested type",
         supports ? "supports" : "rejects"));
   return supports;
@@ -36,7 +46,14 @@ AgnosticDecoderModule::CreateVideoDecoder(const CreateDecoderParams& aParams)
 
   if (VPXDecoder::IsVPX(aParams.mConfig.mMimeType)) {
     m = new VPXDecoder(aParams);
-  } else if (TheoraDecoder::IsTheora(aParams.mConfig.mMimeType)) {
+  }
+#ifdef MOZ_AV1
+  else if (AOMDecoder::IsAV1(aParams.mConfig.mMimeType) &&
+           MediaPrefs::AV1Enabled()) {
+    m = new AOMDecoder(aParams);
+  }
+#endif
+  else if (TheoraDecoder::IsTheora(aParams.mConfig.mMimeType)) {
     m = new TheoraDecoder(aParams);
   }
 
diff --git a/dom/media/platforms/agnostic/VPXDecoder.cpp b/dom/media/platforms/agnostic/VPXDecoder.cpp
index 77c81b51b..f2f84487f 100644
--- a/dom/media/platforms/agnostic/VPXDecoder.cpp
+++ b/dom/media/platforms/agnostic/VPXDecoder.cpp
@@ -22,7 +22,7 @@ namespace mozilla {
 using namespace gfx;
 using namespace layers;
 
-static int MimeTypeToCodec(const nsACString& aMimeType)
+static VPXDecoder::Codec MimeTypeToCodec(const nsACString& aMimeType)
 {
   if (aMimeType.EqualsLiteral("video/webm; codecs=vp8")) {
     return VPXDecoder::Codec::VP8;
@@ -31,7 +31,7 @@ static int MimeTypeToCodec(const nsACString& aMimeType)
   } else if (aMimeType.EqualsLiteral("video/vp9")) {
     return VPXDecoder::Codec::VP9;
   }
-  return -1;
+  return VPXDecoder::Codec::Unknown;
 }
 
 VPXDecoder::VPXDecoder(const CreateDecoderParams& aParams)
@@ -101,17 +101,10 @@ MediaResult
 VPXDecoder::DoDecode(MediaRawData* aSample)
 {
   MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+
 #if defined(DEBUG)
-  vpx_codec_stream_info_t si;
-  PodZero(&si);
-  si.sz = sizeof(si);
-  if (mCodec == Codec::VP8) {
-    vpx_codec_peek_stream_info(vpx_codec_vp8_dx(), aSample->Data(), aSample->Size(), &si);
-  } else if (mCodec == Codec::VP9) {
-    vpx_codec_peek_stream_info(vpx_codec_vp9_dx(), aSample->Data(), aSample->Size(), &si);
-  }
-  NS_ASSERTION(bool(si.is_kf) == aSample->mKeyframe,
-               "VPX Decode Keyframe error sample->mKeyframe and si.si_kf out of sync");
+  NS_ASSERTION(IsKeyframe(*aSample, mCodec) == aSample->mKeyframe,
+               "VPX Decode Keyframe error sample->mKeyframe and sample data out of sync");
 #endif
 
   if (vpx_codec_err_t r = vpx_codec_decode(&mVPX, aSample->Data(), aSample->Size(), nullptr, 0)) {
@@ -249,5 +242,41 @@ VPXDecoder::IsVP9(const nsACString& aMimeType)
   return IsVPX(aMimeType, VPXDecoder::VP9);
 }
 
+/* static */
+bool
+VPXDecoder::IsKeyframe(Span<const uint8_t> aBuffer, Codec aCodec)
+{
+  vpx_codec_stream_info_t si;
+  PodZero(&si);
+  si.sz = sizeof(si);
+
+  if (aCodec == Codec::VP8) {
+    vpx_codec_peek_stream_info(vpx_codec_vp8_dx(), aBuffer.Elements(), aBuffer.Length(), &si);
+    return bool(si.is_kf);
+  } else if (aCodec == Codec::VP9) {
+    vpx_codec_peek_stream_info(vpx_codec_vp9_dx(), aBuffer.Elements(), aBuffer.Length(), &si);
+    return bool(si.is_kf);
+  }
+
+  return false;
+}
+
+/* static */
+nsIntSize
+VPXDecoder::GetFrameSize(Span<const uint8_t> aBuffer, Codec aCodec)
+{
+  vpx_codec_stream_info_t si;
+  PodZero(&si);
+  si.sz = sizeof(si);
+
+  if (aCodec == Codec::VP8) {
+    vpx_codec_peek_stream_info(vpx_codec_vp8_dx(), aBuffer.Elements(), aBuffer.Length(), &si);
+  } else if (aCodec == Codec::VP9) {
+    vpx_codec_peek_stream_info(vpx_codec_vp9_dx(), aBuffer.Elements(), aBuffer.Length(), &si);
+  }
+
+  return nsIntSize(si.w, si.h);
+}
+
 } // namespace mozilla
 #undef LOG
diff --git a/dom/media/platforms/agnostic/VPXDecoder.h b/dom/media/platforms/agnostic/VPXDecoder.h
index d420ec069..4e8d83617 100644
--- a/dom/media/platforms/agnostic/VPXDecoder.h
+++ b/dom/media/platforms/agnostic/VPXDecoder.h
@@ -7,6 +7,7 @@
 #define VPXDecoder_h_
 
 #include "PlatformDecoderModule.h"
+#include "mozilla/Span.h"
 
 #include <stdint.h>
 #define VPX_DONT_DEFINE_STDINT_TYPES
@@ -36,7 +37,8 @@ public:
 
   enum Codec: uint8_t {
     VP8 = 1 << 0,
-    VP9 = 1 << 1
+    VP9 = 1 << 1,
+    Unknown = 1 << 7,
   };
 
   // Return true if aMimeType is a one of the strings used by our demuxers to
@@ -46,6 +48,12 @@ public:
   static bool IsVP8(const nsACString& aMimeType);
   static bool IsVP9(const nsACString& aMimeType);
 
+  // Return true if a sample is a keyframe for the specified codec.
+  static bool IsKeyframe(Span<const uint8_t> aBuffer, Codec aCodec);
+
+  // Return the frame dimensions for a sample for the specified codec.
+  static nsIntSize GetFrameSize(Span<const uint8_t> aBuffer, Codec aCodec);
+
 private:
   void ProcessDecode(MediaRawData* aSample);
   MediaResult DoDecode(MediaRawData* aSample);
@@ -61,7 +69,7 @@ private:
 
   const VideoInfo& mInfo;
 
-  const int mCodec;
+  const Codec mCodec;
 };
 
 } // namespace mozilla
diff --git a/dom/media/platforms/ffmpeg/FFmpegDataDecoder.cpp b/dom/media/platforms/ffmpeg/FFmpegDataDecoder.cpp
index 8cb5c8578..8655ce25f 100644
--- a/dom/media/platforms/ffmpeg/FFmpegDataDecoder.cpp
+++ b/dom/media/platforms/ffmpeg/FFmpegDataDecoder.cpp
@@ -69,12 +69,21 @@ FFmpegDataDecoder<LIBAV_VER>::InitDecoder()
     mCodecContext->extradata_size = mExtraData->Length();
     // FFmpeg may use SIMD instructions to access the data which reads the
     // data in 32 bytes block. Must ensure we have enough data to read.
+    uint32_t padding_size =
 #if LIBAVCODEC_VERSION_MAJOR >= 58
-    mExtraData->AppendElements(AV_INPUT_BUFFER_PADDING_SIZE);
+      AV_INPUT_BUFFER_PADDING_SIZE;
 #else
-    mExtraData->AppendElements(FF_INPUT_BUFFER_PADDING_SIZE);
+      FF_INPUT_BUFFER_PADDING_SIZE;
 #endif
-    mCodecContext->extradata = mExtraData->Elements();
+    mCodecContext->extradata = static_cast<uint8_t*>(
+      mLib->av_malloc(mExtraData->Length() + padding_size));
+    if (!mCodecContext->extradata) {
+      return MediaResult(NS_ERROR_OUT_OF_MEMORY,
+                        RESULT_DETAIL("Couldn't init ffmpeg extradata"));
+    }
+    memcpy(mCodecContext->extradata,
+           mExtraData->Elements(),
+           mExtraData->Length());
   } else {
     mCodecContext->extradata_size = 0;
   }
@@ -165,6 +174,9 @@ FFmpegDataDecoder<LIBAV_VER>::ProcessShutdown()
   StaticMutexAutoLock mon(sMonitor);
 
   if (mCodecContext) {
+    if (mCodecContext->extradata) {
+      mLib->av_freep(&mCodecContext->extradata);
+    }
     mLib->avcodec_close(mCodecContext);
     mLib->av_freep(&mCodecContext);
 #if LIBAVCODEC_VERSION_MAJOR >= 55
diff --git a/dom/media/platforms/ffmpeg/FFmpegLibWrapper.cpp b/dom/media/platforms/ffmpeg/FFmpegLibWrapper.cpp
index 6302882a6..426e9f74b 100644
--- a/dom/media/platforms/ffmpeg/FFmpegLibWrapper.cpp
+++ b/dom/media/platforms/ffmpeg/FFmpegLibWrapper.cpp
@@ -7,6 +7,7 @@
 #include "MediaPrefs.h"
 #include "mozilla/PodOperations.h"
 #include "mozilla/Types.h"
+#include "PlatformDecoderModule.h"
 #include "prlink.h"
 
 #define AV_LOG_DEBUG    48
@@ -144,6 +145,8 @@ FFmpegLibWrapper::Link()
   AV_FUNC(avcodec_alloc_frame, (AV_FUNC_53 | AV_FUNC_54))
   AV_FUNC(avcodec_get_frame_defaults, (AV_FUNC_53 | AV_FUNC_54))
   AV_FUNC(avcodec_free_frame, AV_FUNC_54)
+  AV_FUNC(avcodec_send_packet, AV_FUNC_58)
+  AV_FUNC(avcodec_receive_frame, AV_FUNC_58)
   AV_FUNC(av_log_set_level, AV_FUNC_AVUTIL_ALL)
   AV_FUNC(av_malloc, AV_FUNC_AVUTIL_ALL)
   AV_FUNC(av_freep, AV_FUNC_AVUTIL_ALL)
diff --git a/dom/media/platforms/ffmpeg/FFmpegLibWrapper.h b/dom/media/platforms/ffmpeg/FFmpegLibWrapper.h
index d6944a1d8..b968edd32 100644
--- a/dom/media/platforms/ffmpeg/FFmpegLibWrapper.h
+++ b/dom/media/platforms/ffmpeg/FFmpegLibWrapper.h
@@ -5,6 +5,7 @@
 #ifndef __FFmpegLibWrapper_h__
 #define __FFmpegLibWrapper_h__
 
+#include "mozilla/Attributes.h"
 #include "mozilla/Types.h"
 
 struct AVCodec;
@@ -70,6 +71,10 @@ struct FFmpegLibWrapper
   // libavcodec v54 only
   void (*avcodec_free_frame)(AVFrame** frame);
 
+  // libavcodec v58 and later only
+  int (*avcodec_send_packet)(AVCodecContext* avctx, const AVPacket* avpkt);
+  int (*avcodec_receive_frame)(AVCodecContext* avctx, AVFrame* frame);
+
   // libavutil
   void (*av_log_set_level)(int level);
   void*	(*av_malloc)(size_t size);
@@ -91,4 +96,4 @@ private:
 
 } // namespace mozilla
 
-#endif // FFmpegLibWrapper
\ No newline at end of file
+#endif // FFmpegLibWrapper
diff --git a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
index aec1e9136..f3101e44c 100644
--- a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
+++ b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
@@ -174,12 +174,15 @@ FFmpegVideoDecoder<LIBAV_VER>::DoDecode(MediaRawData* aSample, bool* aGotFrame)
   uint8_t* inputData = const_cast<uint8_t*>(aSample->Data());
   size_t inputSize = aSample->Size();
 
-#if LIBAVCODEC_VERSION_MAJOR >= 54
+#if LIBAVCODEC_VERSION_MAJOR >= 54 && LIBAVCODEC_VERSION_MAJOR < 58
   if (inputSize && mCodecParser && (mCodecID == AV_CODEC_ID_VP8
-#if LIBAVCODEC_VERSION_MAJOR >= 55
+#if LIBAVCODEC_VERSION_MAJOR >= 55 && LIBAVCODEC_VERSION_MAJOR < 58
       || mCodecID == AV_CODEC_ID_VP9
 #endif
-      )) {
+      ))
+#endif
+#if LIBAVCODEC_VERSION_MAJOR >= 54
+  {
     while (inputSize) {
       uint8_t* data = inputData;
       int size = inputSize;
@@ -224,6 +227,48 @@ FFmpegVideoDecoder<LIBAV_VER>::DoDecode(MediaRawData* aSample,
   packet.flags = aSample->mKeyframe ? AV_PKT_FLAG_KEY : 0;
   packet.pos = aSample->mOffset;
 
+#if LIBAVCODEC_VERSION_MAJOR >= 58
+  packet.duration = aSample->mDuration;
+  int res = mLib->avcodec_send_packet(mCodecContext, &packet);
+  if (res < 0) {
+    // In theory, avcodec_send_packet could sent -EAGAIN should its internal
+    // buffers be full. In practice this can't happen as we only feed one frame
+    // at a time, and we immediately call avcodec_receive_frame right after.
+    FFMPEG_LOG("avcodec_send_packet error: %d", res);
+    return MediaResult(NS_ERROR_DOM_MEDIA_DECODE_ERR,
+                       RESULT_DETAIL("avcodec_send_packet error: %d", res));
+  }
+
+  if (aGotFrame) {
+    *aGotFrame = false;
+  }
+  do {
+    if (!PrepareFrame()) {
+      NS_WARNING("FFmpeg h264 decoder failed to allocate frame.");
+      return MediaResult(NS_ERROR_OUT_OF_MEMORY, __func__);
+    }
+    res = mLib->avcodec_receive_frame(mCodecContext, mFrame);
+    if (res == int(AVERROR_EOF)) {
+      return NS_ERROR_DOM_MEDIA_END_OF_STREAM;
+    }
+    if (res == AVERROR(EAGAIN)) {
+      return NS_OK;
+    }
+    if (res < 0) {
+      FFMPEG_LOG("avcodec_receive_frame error: %d", res);
+      return MediaResult(NS_ERROR_DOM_MEDIA_DECODE_ERR,
+                         RESULT_DETAIL("avcodec_receive_frame error: %d", res));
+    }
+    MediaResult rv = CreateImage(mFrame->pkt_pos, mFrame->pkt_pts,
+                                 mFrame->pkt_duration);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    if (aGotFrame) {
+      *aGotFrame = true;
+    }
+  } while (true);
+#else
   // LibAV provides no API to retrieve the decoded sample's duration.
   // (FFmpeg >= 1.0 provides av_frame_get_pkt_duration)
   // As such we instead use a map using the dts as key that we will retrieve
@@ -276,8 +321,21 @@ FFmpegVideoDecoder<LIBAV_VER>::DoDecode(MediaRawData* aSample,
     // against the map becoming extremely big.
     mDurationMap.Clear();
   }
+
+  MediaResult rv = CreateImage(aSample->mOffset, pts, duration);
+  if (NS_SUCCEEDED(rv) && aGotFrame) {
+    *aGotFrame = true;
+  }
+  return rv;
+#endif
+}
+
+MediaResult
+FFmpegVideoDecoder<LIBAV_VER>::CreateImage(int64_t aOffset, int64_t aPts,
+                                           int64_t aDuration)
+{
   FFMPEG_LOG("Got one frame output with pts=%lld dts=%lld duration=%lld opaque=%lld",
-              pts, mFrame->pkt_dts, duration, mCodecContext->reordered_opaque);
+              aPts, mFrame->pkt_dts, aDuration, mCodecContext->reordered_opaque);
 
   VideoData::YCbCrBuffer b;
   b.mPlanes[0].mData = mFrame->data[0];
@@ -317,9 +375,9 @@ FFmpegVideoDecoder<LIBAV_VER>::DoDecode(MediaRawData* aSample,
   RefPtr<VideoData> v =
     VideoData::CreateAndCopyData(mInfo,
                                   mImageContainer,
-                                  aSample->mOffset,
-                                  pts,
-                                  duration,
+                                  aOffset,
+                                  aPts,
+                                  aDuration,
                                   b,
                                   !!mFrame->key_frame,
                                   -1,
@@ -331,9 +389,6 @@ FFmpegVideoDecoder<LIBAV_VER>::DoDecode(MediaRawData* aSample,
                        RESULT_DETAIL("image allocation error"));
   }
   mCallback->Output(v);
-  if (aGotFrame) {
-    *aGotFrame = true;
-  }
   return NS_OK;
 }
 
diff --git a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h
index 786df0da1..49a55e8a6 100644
--- a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h
+++ b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h
@@ -49,6 +49,7 @@ private:
   MediaResult DoDecode(MediaRawData* aSample) override;
   MediaResult DoDecode(MediaRawData* aSample, bool* aGotFrame);
   MediaResult DoDecode(MediaRawData* aSample, uint8_t* aData, int aSize, bool* aGotFrame);
+  MediaResult CreateImage(int64_t aOffset, int64_t aPts, int64_t aDuration);
   void ProcessDrain() override;
   void ProcessFlush() override;
   void OutputDelayedFrames();
diff --git a/dom/media/platforms/ffmpeg/ffvpx/moz.build b/dom/media/platforms/ffmpeg/ffvpx/moz.build
index aee58b5b0..c0041a4d4 100644
--- a/dom/media/platforms/ffmpeg/ffvpx/moz.build
+++ b/dom/media/platforms/ffmpeg/ffvpx/moz.build
@@ -20,7 +20,7 @@ SOURCES += [
 ]
 LOCAL_INCLUDES += [
     '..',
-    '../ffmpeg57/include',
+    '../ffmpeg58/include',
 ]
 
 if CONFIG['OS_ARCH'] == 'WINNT':
diff --git a/dom/media/platforms/moz.build b/dom/media/platforms/moz.build
index 3fb0cc842..f5fb72c5d 100644
--- a/dom/media/platforms/moz.build
+++ b/dom/media/platforms/moz.build
@@ -10,7 +10,6 @@ EXPORTS += [
     'agnostic/TheoraDecoder.h',
     'agnostic/VorbisDecoder.h',
     'agnostic/VPXDecoder.h',
-    'MediaTelemetryConstants.h',
     'PDMFactory.h',
     'PlatformDecoderModule.h',
     'wrappers/FuzzingWrapper.h',
@@ -55,6 +54,14 @@ if CONFIG['MOZ_FFMPEG']:
         'ffmpeg',
     ]
 
+if CONFIG['MOZ_AV1']:
+    EXPORTS += [
+        'agnostic/AOMDecoder.h',
+    ]
+    UNIFIED_SOURCES += [
+        'agnostic/AOMDecoder.cpp',
+    ]
+
 if CONFIG['MOZ_APPLEMEDIA']:
   EXPORTS += [
       'apple/AppleDecoderModule.h',
diff --git a/dom/media/platforms/omx/OmxPlatformLayer.cpp b/dom/media/platforms/omx/OmxPlatformLayer.cpp
index 039b4a22f..15b3062a4 100644
--- a/dom/media/platforms/omx/OmxPlatformLayer.cpp
+++ b/dom/media/platforms/omx/OmxPlatformLayer.cpp
@@ -282,26 +282,7 @@ OmxPlatformLayer::CompressionFormat()
   }
 }
 
-// Implementations for different platforms will be defined in their own files.
-#ifdef OMX_PLATFORM_GONK
-
-bool
-OmxPlatformLayer::SupportsMimeType(const nsACString& aMimeType)
-{
-  return GonkOmxPlatformLayer::FindComponents(aMimeType);
-}
-
-OmxPlatformLayer*
-OmxPlatformLayer::Create(OmxDataDecoder* aDataDecoder,
-                         OmxPromiseLayer* aPromiseLayer,
-                         TaskQueue* aTaskQueue,
-                         layers::ImageContainer* aImageContainer)
-{
-  return new GonkOmxPlatformLayer(aDataDecoder, aPromiseLayer, aTaskQueue, aImageContainer);
-}
-
-#else // For platforms without OMX IL support.
-
+// For platforms without OMX IL support.
 bool
 OmxPlatformLayer::SupportsMimeType(const nsACString& aMimeType)
 {
@@ -317,6 +298,4 @@ OmxPlatformLayer::Create(OmxDataDecoder* aDataDecoder,
   return nullptr;
 }
 
-#endif
-
 }
diff --git a/dom/media/platforms/wmf/DXVA2Manager.cpp b/dom/media/platforms/wmf/DXVA2Manager.cpp
index 0c1734c54..69e002f7f 100644
--- a/dom/media/platforms/wmf/DXVA2Manager.cpp
+++ b/dom/media/platforms/wmf/DXVA2Manager.cpp
@@ -14,8 +14,6 @@
 #include "mozilla/layers/D3D11ShareHandleImage.h"
 #include "mozilla/layers/ImageBridgeChild.h"
 #include "mozilla/layers/TextureForwarder.h"
-#include "mozilla/Telemetry.h"
-#include "MediaTelemetryConstants.h"
 #include "mfapi.h"
 #include "gfxPrefs.h"
 #include "MFTDecoder.h"
@@ -442,9 +440,6 @@ D3D9DXVA2Manager::Init(layers::KnowsCompositor* aKnowsCompositor,
   }
   mTextureClientAllocator->SetMaxPoolSize(5);
 
-  Telemetry::Accumulate(Telemetry::MEDIA_DECODER_BACKEND_USED,
-                        uint32_t(media::MediaDecoderBackend::WMFDXVA2D3D9));
-
   return S_OK;
 }
 
@@ -775,9 +770,6 @@ D3D11DXVA2Manager::Init(layers::KnowsCompositor* aKnowsCompositor,
   }
   mTextureClientAllocator->SetMaxPoolSize(5);
 
-  Telemetry::Accumulate(Telemetry::MEDIA_DECODER_BACKEND_USED,
-                        uint32_t(media::MediaDecoderBackend::WMFDXVA2D3D11));
-
   return S_OK;
 }
 
diff --git a/dom/media/platforms/wmf/WMFAudioMFTManager.cpp b/dom/media/platforms/wmf/WMFAudioMFTManager.cpp
index 69b62da51..3dacdf0aa 100644
--- a/dom/media/platforms/wmf/WMFAudioMFTManager.cpp
+++ b/dom/media/platforms/wmf/WMFAudioMFTManager.cpp
@@ -252,7 +252,6 @@ WMFAudioMFTManager::Output(int64_t aStreamOffset,
     LOG("Audio MFTDecoder returned success but null output.");
     nsCOMPtr<nsIRunnable> task = NS_NewRunnableFunction([]() -> void {
       LOG("Reporting telemetry AUDIO_MFT_OUTPUT_NULL_SAMPLES");
-      Telemetry::Accumulate(Telemetry::ID::AUDIO_MFT_OUTPUT_NULL_SAMPLES, 1);
     });
     AbstractThread::MainThread()->Dispatch(task.forget());
     return E_FAIL;
diff --git a/dom/media/platforms/wmf/WMFDecoderModule.h b/dom/media/platforms/wmf/WMFDecoderModule.h
index cd7b8c660..6582f8056 100644
--- a/dom/media/platforms/wmf/WMFDecoderModule.h
+++ b/dom/media/platforms/wmf/WMFDecoderModule.h
@@ -40,10 +40,8 @@ public:
   static int GetNumDecoderThreads();
 
   // Accessors that report whether we have the required MFTs available
-  // on the system to play various codecs. Windows Vista doesn't have the
-  // H.264/AAC decoders if the "Platform Update Supplement for Windows Vista"
-  // is not installed, and Window N and KN variants also require a "Media
-  // Feature Pack" to be installed. Windows XP doesn't have WMF.
+  // on the system to play various codecs. Windows N and KN variants
+  // require a "Media Feature Pack" to be installed.
   static bool HasAAC();
   static bool HasH264();
 
diff --git a/dom/media/platforms/wmf/WMFMediaDataDecoder.cpp b/dom/media/platforms/wmf/WMFMediaDataDecoder.cpp
index d2c13eac7..e6dd29c6d 100644
--- a/dom/media/platforms/wmf/WMFMediaDataDecoder.cpp
+++ b/dom/media/platforms/wmf/WMFMediaDataDecoder.cpp
@@ -8,7 +8,6 @@
 #include "VideoUtils.h"
 #include "WMFUtils.h"
 #include "nsTArray.h"
-#include "mozilla/Telemetry.h"
 
 #include "mozilla/Logging.h"
 #include "mozilla/SyncRunnable.h"
@@ -39,39 +38,6 @@ WMFMediaDataDecoder::Init()
   return InitPromise::CreateAndResolve(mMFTManager->GetType(), __func__);
 }
 
-// A single telemetry sample is reported for each MediaDataDecoder object
-// that has detected error or produced output successfully.
-static void
-SendTelemetry(unsigned long hr)
-{
-  // Collapse the error codes into a range of 0-0xff that can be viewed in
-  // telemetry histograms.  For most MF_E_* errors, unique samples are used,
-  // retaining the least significant 7 or 8 bits.  Other error codes are
-  // bucketed.
-  uint32_t sample;
-  if (SUCCEEDED(hr)) {
-    sample = 0;
-  } else if (hr < 0xc00d36b0) {
-    sample = 1; // low bucket
-  } else if (hr < 0xc00d3700) {
-    sample = hr & 0xffU; // MF_E_*
-  } else if (hr <= 0xc00d3705) {
-    sample = 0x80 + (hr & 0xfU); // more MF_E_*
-  } else if (hr < 0xc00d6d60) {
-    sample = 2; // mid bucket
-  } else if (hr <= 0xc00d6d78) {
-    sample = hr & 0xffU; // MF_E_TRANSFORM_*
-  } else {
-    sample = 3; // high bucket
-  }
-
-  nsCOMPtr<nsIRunnable> runnable = NS_NewRunnableFunction(
-    [sample] {
-      Telemetry::Accumulate(Telemetry::MEDIA_WMF_DECODE_ERROR, sample);
-    });
-  NS_DispatchToMainThread(runnable);
-}
-
 void
 WMFMediaDataDecoder::Shutdown()
 {
@@ -91,9 +57,6 @@ WMFMediaDataDecoder::ProcessShutdown()
   if (mMFTManager) {
     mMFTManager->Shutdown();
     mMFTManager = nullptr;
-    if (!mRecordedError && mHasSuccessfulOutput) {
-      SendTelemetry(S_OK);
-    }
   }
 }
 
@@ -125,10 +88,6 @@ WMFMediaDataDecoder::ProcessDecode(MediaRawData* aSample)
     NS_WARNING("MFTManager rejected sample");
     mCallback->Error(MediaResult(NS_ERROR_DOM_MEDIA_DECODE_ERR,
                                  RESULT_DETAIL("MFTManager::Input:%x", hr)));
-    if (!mRecordedError) {
-      SendTelemetry(hr);
-      mRecordedError = true;
-    }
     return;
   }
 
@@ -144,7 +103,6 @@ WMFMediaDataDecoder::ProcessOutput()
   HRESULT hr = S_OK;
   while (SUCCEEDED(hr = mMFTManager->Output(mLastStreamOffset, output)) &&
          output) {
-    mHasSuccessfulOutput = true;
     mCallback->Output(output);
   }
   if (hr == MF_E_TRANSFORM_NEED_MORE_INPUT) {
@@ -153,10 +111,6 @@ WMFMediaDataDecoder::ProcessOutput()
     NS_WARNING("WMFMediaDataDecoder failed to output data");
     mCallback->Error(MediaResult(NS_ERROR_DOM_MEDIA_DECODE_ERR,
                                  RESULT_DETAIL("MFTManager::Output:%x", hr)));
-    if (!mRecordedError) {
-      SendTelemetry(hr);
-      mRecordedError = true;
-    }
   }
 }
 
diff --git a/dom/media/platforms/wmf/WMFMediaDataDecoder.h b/dom/media/platforms/wmf/WMFMediaDataDecoder.h
index a4dd49f56..f869012e7 100644
--- a/dom/media/platforms/wmf/WMFMediaDataDecoder.h
+++ b/dom/media/platforms/wmf/WMFMediaDataDecoder.h
@@ -33,7 +33,7 @@ public:
   // Returns S_OK on success, or MF_E_TRANSFORM_NEED_MORE_INPUT if there's not
   // enough data to produce more output. If this returns a failure code other
   // than MF_E_TRANSFORM_NEED_MORE_INPUT, an error will be reported to the
-  // MP4Reader.
+  // MP4Demuxer.
   virtual HRESULT Output(int64_t aStreamOffset,
                          RefPtr<MediaData>& aOutput) = 0;
 
@@ -136,10 +136,6 @@ private:
   Atomic<bool> mIsFlushing;
 
   bool mIsShutDown;
-
-  // For telemetry
-  bool mHasSuccessfulOutput = false;
-  bool mRecordedError = false;
 };
 
 } // namespace mozilla
diff --git a/dom/media/platforms/wmf/WMFVideoMFTManager.cpp b/dom/media/platforms/wmf/WMFVideoMFTManager.cpp
index 291bc5b74..a7633a7de 100644
--- a/dom/media/platforms/wmf/WMFVideoMFTManager.cpp
+++ b/dom/media/platforms/wmf/WMFVideoMFTManager.cpp
@@ -27,7 +27,6 @@
 #include "mozilla/WindowsVersion.h"
 #include "mozilla/Telemetry.h"
 #include "nsPrintfCString.h"
-#include "MediaTelemetryConstants.h"
 #include "GMPUtils.h" // For SplitAt. TODO: Move SplitAt to a central place.
 #include "MP4Decoder.h"
 #include "VPXDecoder.h"
@@ -128,7 +127,6 @@ WMFVideoMFTManager::~WMFVideoMFTManager()
 
   nsCOMPtr<nsIRunnable> task = NS_NewRunnableFunction([=]() -> void {
     LOG(nsPrintfCString("Reporting telemetry VIDEO_MFT_OUTPUT_NULL_SAMPLES=%d", telemetry).get());
-    Telemetry::Accumulate(Telemetry::ID::VIDEO_MFT_OUTPUT_NULL_SAMPLES, telemetry);
   });
   AbstractThread::MainThread()->Dispatch(task.forget());
 }
@@ -511,8 +509,6 @@ WMFVideoMFTManager::InitInternal(bool aForceD3D9)
     if (mStreamType == VP9 || mStreamType == VP8) {
       return false;
     }
-    Telemetry::Accumulate(Telemetry::MEDIA_DECODER_BACKEND_USED,
-                          uint32_t(media::MediaDecoderBackend::WMFSoftware));
   }
 
   mDecoder = decoder;
diff --git a/dom/media/systemservices/LoadManager.cpp b/dom/media/systemservices/LoadManager.cpp
index f0f4f83a7..34b8fc7e0 100644
--- a/dom/media/systemservices/LoadManager.cpp
+++ b/dom/media/systemservices/LoadManager.cpp
@@ -15,7 +15,6 @@
 #include "nsThreadUtils.h"
 #include "nsReadableUtils.h"
 #include "nsIObserverService.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/ArrayUtils.h"
 
 // MOZ_LOG=LoadManager:5
@@ -192,23 +191,6 @@ LoadManagerSingleton::RemoveObserver(webrtc::CPULoadStateObserver * aObserver)
     for (size_t i = 0; i < MOZ_ARRAY_LENGTH(mTimeInState); i++) {
       total += mTimeInState[i];
     }
-    // Don't include short calls; we don't have reasonable load data, and
-    // such short calls rarely reach a stable state.  Keep relatively
-    // short calls separate from longer ones
-    bool log = total > 5*PR_MSEC_PER_SEC;
-    bool small = log && total < 30*PR_MSEC_PER_SEC;
-    if (log) {
-      // Note: We don't care about rounding here; thus total may be < 100
-      Telemetry::Accumulate(small ? Telemetry::WEBRTC_LOAD_STATE_RELAXED_SHORT :
-                            Telemetry::WEBRTC_LOAD_STATE_RELAXED,
-                            (uint32_t) (mTimeInState[webrtc::CPULoadState::kLoadRelaxed]/total * 100));
-      Telemetry::Accumulate(small ? Telemetry::WEBRTC_LOAD_STATE_NORMAL_SHORT :
-                            Telemetry::WEBRTC_LOAD_STATE_NORMAL,
-                            (uint32_t) (mTimeInState[webrtc::CPULoadState::kLoadNormal]/total * 100));
-      Telemetry::Accumulate(small ? Telemetry::WEBRTC_LOAD_STATE_STRESSED_SHORT :
-                            Telemetry::WEBRTC_LOAD_STATE_STRESSED,
-                            (uint32_t) (mTimeInState[webrtc::CPULoadState::kLoadStressed]/total * 100));
-    }
     for (auto &in_state : mTimeInState) {
       in_state = 0;
     }
diff --git a/dom/media/test/bug580982.webm b/dom/media/test/bug1377278.webm
index 802019f39..802019f39 100644
--- a/dom/media/test/bug580982.webm
+++ b/dom/media/test/bug1377278.webm
diff --git a/dom/media/test/bug580982.webm^headers^ b/dom/media/test/bug1377278.webm^headers^
index 4030ea1d3..4030ea1d3 100644
--- a/dom/media/test/bug580982.webm^headers^
+++ b/dom/media/test/bug1377278.webm^headers^
diff --git a/dom/media/test/crashtests/1228484.html b/dom/media/test/crashtests/1228484.html
deleted file mode 100644
index 2b2e9b0f9..000000000
--- a/dom/media/test/crashtests/1228484.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<script>
-
-var htmlAudio = new Audio(URL.createObjectURL(new window.MediaSource()));
-
-(new window.AudioContext("ringer")).createMediaElementSource(htmlAudio);
-(new window.AudioContext("alarm")).createMediaElementSource(htmlAudio);
-
-</script>
-</head>
-</html>
diff --git a/dom/media/test/crashtests/crashtests.list b/dom/media/test/crashtests/crashtests.list
index 496fe5ee5..e4f25ca8d 100644
--- a/dom/media/test/crashtests/crashtests.list
+++ b/dom/media/test/crashtests/crashtests.list
@@ -81,8 +81,6 @@ load 1157994.html
 load 1158427.html
 load 1185176.html
 load 1185192.html
-load 1223670.html
-load 1228484.html
 load 1304948.html
 load 1319486.html
 load 1291702.html
diff --git a/dom/media/test/manifest.js b/dom/media/test/manifest.js
index c6d533c1b..52e53a271 100644
--- a/dom/media/test/manifest.js
+++ b/dom/media/test/manifest.js
@@ -224,6 +224,9 @@ var gPlayTests = [
   // Test playback of a webm file
   { name:"seek-short.webm", type:"video/webm", duration:0.23 },
 
+  // Test playback of a webm file with 'matroska' doctype
+  { name:"bug1377278.webm", type:"video/webm", duration:4.0 },
+
   // Test playback of a WebM file with non-zero start time.
   { name:"split.webm", type:"video/webm", duration:1.967 },
 
@@ -263,10 +266,10 @@ var gPlayTests = [
   { name:"small-shot.mp3", type:"audio/mpeg", duration:0.27 },
   { name:"owl.mp3", type:"audio/mpeg", duration:3.343 },
   // owl.mp3 as above, but with something funny going on in the ID3v2 tag
-  // that causes DirectShow to fail.
+  // that caused DirectShow to fail.
   { name:"owl-funny-id3.mp3", type:"audio/mpeg", duration:3.343 },
   // owl.mp3 as above, but with something even funnier going on in the ID3v2 tag
-  // that causes DirectShow to fail.
+  // that caused DirectShow to fail.
   { name:"owl-funnier-id3.mp3", type:"audio/mpeg", duration:3.343 },
   // One second of silence with ~140KB of ID3 tags. Usually when the first MP3
   // frame is at such a high offset into the file, MP3FrameParser will give up
@@ -532,7 +535,6 @@ var gErrorTests = [
   { name:"448636.ogv", type:"video/ogg" },
   { name:"bug504843.ogv", type:"video/ogg" },
   { name:"bug501279.ogg", type:"audio/ogg" },
-  { name:"bug580982.webm", type:"video/webm" },
   { name:"bug603918.webm", type:"video/webm" },
   { name:"bug604067.webm", type:"video/webm" },
   { name:"bogus.duh", type:"bogus/duh" }
diff --git a/dom/media/test/mochitest.ini b/dom/media/test/mochitest.ini
index ddabf78b6..742ac1b1c 100644
--- a/dom/media/test/mochitest.ini
+++ b/dom/media/test/mochitest.ini
@@ -382,8 +382,6 @@ support-files =
   bug556821.ogv^headers^
   bug557094.ogv
   bug557094.ogv^headers^
-  bug580982.webm
-  bug580982.webm^headers^
   bug603918.webm
   bug603918.webm^headers^
   bug604067.webm
@@ -395,6 +393,8 @@ support-files =
   bug1301226.wav^headers^
   bug1301226-odd.wav
   bug1301226-odd.wav^headers^
+  bug1377278.webm
+  bug1377278.webm^headers^
   can_play_type_dash.js
   can_play_type_ogg.js
   can_play_type_wave.js
diff --git a/dom/media/test/test_can_play_type_mpeg.html b/dom/media/test/test_can_play_type_mpeg.html
index 89e5fabef..514b5cc2f 100644
--- a/dom/media/test/test_can_play_type_mpeg.html
+++ b/dom/media/test/test_can_play_type_mpeg.html
@@ -151,8 +151,7 @@ var haveMp4 = (getPref("media.wmf.enabled") && IsWindowsVistaOrLater()) ||
 
 check_mp4(document.getElementById('v'), haveMp4);
 
-var haveMp3 = getPref("media.directshow.enabled") ||
-              (getPref("media.wmf.enabled") && IsWindowsVistaOrLater()) ||
+var haveMp3 = getPref("media.wmf.enabled") ||
               (IsLinux() && getPref("media.ffmpeg.enabled")) ||
               (IsSupportedAndroid() &&
                ((IsJellyBeanOrLater() && getPref("media.android-media-codec.enabled")) ||
diff --git a/dom/media/webaudio/AudioBuffer.cpp b/dom/media/webaudio/AudioBuffer.cpp
index cb834f6a5..e7eba2d48 100644
--- a/dom/media/webaudio/AudioBuffer.cpp
+++ b/dom/media/webaudio/AudioBuffer.cpp
@@ -27,7 +27,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AudioBuffer)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AudioBuffer)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(AudioBuffer)
diff --git a/dom/media/webaudio/AudioContext.cpp b/dom/media/webaudio/AudioContext.cpp
index 85842c811..d58441309 100755
--- a/dom/media/webaudio/AudioContext.cpp
+++ b/dom/media/webaudio/AudioContext.cpp
@@ -179,23 +179,13 @@ AudioContext::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
 AudioContext::Constructor(const GlobalObject& aGlobal,
                           ErrorResult& aRv)
 {
-  return AudioContext::Constructor(aGlobal,
-                                   AudioChannelService::GetDefaultAudioChannel(),
-                                   aRv);
-}
-
-/* static */ already_AddRefed<AudioContext>
-AudioContext::Constructor(const GlobalObject& aGlobal,
-                          AudioChannel aChannel,
-                          ErrorResult& aRv)
-{
   nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aGlobal.GetAsSupports());
   if (!window) {
     aRv.Throw(NS_ERROR_FAILURE);
     return nullptr;
   }
 
-  RefPtr<AudioContext> object = new AudioContext(window, false, aChannel);
+  RefPtr<AudioContext> object = new AudioContext(window, false, AudioChannelService::GetDefaultAudioChannel());
   aRv = object->Init();
   if (NS_WARN_IF(aRv.Failed())) {
      return nullptr;
diff --git a/dom/media/webaudio/AudioContext.h b/dom/media/webaudio/AudioContext.h
index 069efa986..599debef8 100644
--- a/dom/media/webaudio/AudioContext.h
+++ b/dom/media/webaudio/AudioContext.h
@@ -151,12 +151,6 @@ public:
   static already_AddRefed<AudioContext>
   Constructor(const GlobalObject& aGlobal, ErrorResult& aRv);
 
-  // Constructor for regular AudioContext. A default audio channel is needed.
-  static already_AddRefed<AudioContext>
-  Constructor(const GlobalObject& aGlobal,
-              AudioChannel aChannel,
-              ErrorResult& aRv);
-
   // Constructor for offline AudioContext
   static already_AddRefed<AudioContext>
   Constructor(const GlobalObject& aGlobal,
diff --git a/dom/media/webaudio/AudioParam.cpp b/dom/media/webaudio/AudioParam.cpp
index 6f5574993..c1a874264 100644
--- a/dom/media/webaudio/AudioParam.cpp
+++ b/dom/media/webaudio/AudioParam.cpp
@@ -22,7 +22,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AudioParam)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AudioParam)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNode)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(AudioParam)
diff --git a/dom/media/webaudio/MediaBufferDecoder.cpp b/dom/media/webaudio/MediaBufferDecoder.cpp
index e9f1d5a47..f3b75ca1a 100644
--- a/dom/media/webaudio/MediaBufferDecoder.cpp
+++ b/dom/media/webaudio/MediaBufferDecoder.cpp
@@ -23,7 +23,6 @@
 #include "VideoUtils.h"
 #include "WebAudioUtils.h"
 #include "mozilla/dom/Promise.h"
-#include "mozilla/Telemetry.h"
 #include "nsPrintfCString.h"
 #include "GMPService.h"
 
@@ -45,7 +44,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(WebAudioDecodeJob)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOutput)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSuccessCallback)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFailureCallback)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(WebAudioDecodeJob)
@@ -302,7 +300,6 @@ MediaDecodeTask::OnMetadataRead(MetadataHolder* aMetadata)
     MOZ_LOG(gMediaDecoderLog,
             LogLevel::Debug,
             ("Telemetry (WebAudio) MEDIA_CODEC_USED= '%s'", codec.get()));
-    Telemetry::Accumulate(Telemetry::ID::MEDIA_CODEC_USED, codec);
   });
   AbstractThread::MainThread()->Dispatch(task.forget());
 
diff --git a/dom/media/webaudio/WaveShaperNode.cpp b/dom/media/webaudio/WaveShaperNode.cpp
index d5c617dcd..4c50f2f1d 100644
--- a/dom/media/webaudio/WaveShaperNode.cpp
+++ b/dom/media/webaudio/WaveShaperNode.cpp
@@ -23,7 +23,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(WaveShaperNode, AudioNode)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(WaveShaperNode, AudioNode)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(WaveShaperNode)
diff --git a/dom/media/webm/WebMDecoder.cpp b/dom/media/webm/WebMDecoder.cpp
index b41de6d40..9575d6e42 100644
--- a/dom/media/webm/WebMDecoder.cpp
+++ b/dom/media/webm/WebMDecoder.cpp
@@ -5,6 +5,10 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/Preferences.h"
+#ifdef MOZ_AV1
+#include "AOMDecoder.h"
+#endif
+#include "MediaPrefs.h"
 #include "MediaDecoderStateMachine.h"
 #include "WebMDemuxer.h"
 #include "WebMDecoder.h"
@@ -65,6 +69,11 @@ WebMDecoder::CanHandleMediaType(const nsACString& aMIMETypeExcludingCodecs,
 
       continue;
     }
+#ifdef MOZ_AV1
+    if (MediaPrefs::AV1Enabled() && IsAV1CodecString(codec)) {
+      continue;
+    }
+#endif
     // Some unsupported codec.
     return false;
   }
diff --git a/dom/media/webm/WebMDemuxer.cpp b/dom/media/webm/WebMDemuxer.cpp
index 20ed71581..013da9b2c 100644
--- a/dom/media/webm/WebMDemuxer.cpp
+++ b/dom/media/webm/WebMDemuxer.cpp
@@ -8,7 +8,11 @@
 #include "MediaDecoderStateMachine.h"
 #include "AbstractMediaDecoder.h"
 #include "MediaResource.h"
+#ifdef MOZ_AV1
+#include "AOMDecoder.h"
+#endif
 #include "OpusDecoder.h"
+#include "VPXDecoder.h"
 #include "WebMDemuxer.h"
 #include "WebMBufferedParser.h"
 #include "gfx2DGlue.h"
@@ -24,12 +28,9 @@
 #include "mozilla/Sprintf.h"
 
 #include <algorithm>
+#include <numeric>
 #include <stdint.h>
 
-#define VPX_DONT_DEFINE_STDINT_TYPES
-#include "vpx/vp8dx.h"
-#include "vpx/vpx_decoder.h"
-
 #define WEBM_DEBUG(arg, ...) MOZ_LOG(gMediaDemuxerLog, mozilla::LogLevel::Debug, ("WebMDemuxer(%p)::%s: " arg, this, __func__, ##__VA_ARGS__))
 extern mozilla::LazyLogModule gMediaDemuxerLog;
 
@@ -322,6 +323,9 @@ WebMDemuxer::ReadMetadata()
         case NESTEGG_CODEC_VP9:
           mInfo.mVideo.mMimeType = "video/webm; codecs=vp9";
           break;
+        case NESTEGG_CODEC_AV1:
+          mInfo.mVideo.mMimeType = "video/webm; codecs=av1";
+          break;
         default:
           NS_WARNING("Unknown WebM video codec");
           return NS_ERROR_FAILURE;
@@ -549,7 +553,7 @@ WebMDemuxer::GetTrackCrypto(TrackInfo::TrackType aType, size_t aTrackNumber) {
   return crypto;
 }
 
-bool
+nsresult
 WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType, MediaRawDataQueue *aSamples)
 {
   if (mIsMediaSource) {
@@ -557,17 +561,18 @@ WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType, MediaRawDataQueue *aSampl
     EnsureUpToDateIndex();
   }
 
-  RefPtr<NesteggPacketHolder> holder(NextPacket(aType));
+  RefPtr<NesteggPacketHolder> holder;
+  nsresult rv = NextPacket(aType, holder);
 
-  if (!holder) {
-    return false;
+  if (NS_FAILED(rv)) {
+    return rv;
   }
 
   int r = 0;
   unsigned int count = 0;
   r = nestegg_packet_count(holder->Packet(), &count);
   if (r == -1) {
-    return false;
+    return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
   }
   int64_t tstamp = holder->Timestamp();
   int64_t duration = holder->Duration();
@@ -578,7 +583,11 @@ WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType, MediaRawDataQueue *aSampl
   // video frame.
   int64_t next_tstamp = INT64_MIN;
   if (aType == TrackInfo::kAudioTrack) {
-    RefPtr<NesteggPacketHolder> next_holder(NextPacket(aType));
+    RefPtr<NesteggPacketHolder> next_holder;
+    rv = NextPacket(aType, next_holder);
+    if (NS_FAILED(rv) && rv != NS_ERROR_DOM_MEDIA_END_OF_STREAM) {
+      return rv;
+    }
     if (next_holder) {
       next_tstamp = next_holder->Timestamp();
       PushAudioPacket(next_holder);
@@ -593,7 +602,11 @@ WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType, MediaRawDataQueue *aSampl
     }
     mLastAudioFrameTime = Some(tstamp);
   } else if (aType == TrackInfo::kVideoTrack) {
-    RefPtr<NesteggPacketHolder> next_holder(NextPacket(aType));
+    RefPtr<NesteggPacketHolder> next_holder;
+    rv = NextPacket(aType, next_holder);
+    if (NS_FAILED(rv) && rv != NS_ERROR_DOM_MEDIA_END_OF_STREAM) {
+      return rv;
+    }
     if (next_holder) {
       next_tstamp = next_holder->Timestamp();
       PushVideoPacket(next_holder);
@@ -610,7 +623,7 @@ WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType, MediaRawDataQueue *aSampl
   }
 
   if (mIsMediaSource && next_tstamp == INT64_MIN) {
-    return false;
+    return NS_ERROR_DOM_MEDIA_END_OF_STREAM;
   }
 
   int64_t discardPadding = 0;
@@ -626,7 +639,7 @@ WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType, MediaRawDataQueue *aSampl
     r = nestegg_packet_data(holder->Packet(), i, &data, &length);
     if (r == -1) {
       WEBM_DEBUG("nestegg_packet_data failed r=%d", r);
-      return false;
+      return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
     }
     bool isKeyframe = false;
     if (aType == TrackInfo::kAudioTrack) {
@@ -636,29 +649,46 @@ WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType, MediaRawDataQueue *aSampl
         // Packet is encrypted, can't peek, use packet info
         isKeyframe = nestegg_packet_has_keyframe(holder->Packet()) == NESTEGG_PACKET_HAS_KEYFRAME_TRUE;
       } else {
-        vpx_codec_stream_info_t si;
-        PodZero(&si);
-        si.sz = sizeof(si);
+        auto sample = MakeSpan(data, length);
         switch (mVideoCodec) {
         case NESTEGG_CODEC_VP8:
-          vpx_codec_peek_stream_info(vpx_codec_vp8_dx(), data, length, &si);
+          isKeyframe = VPXDecoder::IsKeyframe(sample, VPXDecoder::Codec::VP8);
           break;
         case NESTEGG_CODEC_VP9:
-          vpx_codec_peek_stream_info(vpx_codec_vp9_dx(), data, length, &si);
+          isKeyframe = VPXDecoder::IsKeyframe(sample, VPXDecoder::Codec::VP9);
+          break;
+#ifdef MOZ_AV1
+        case NESTEGG_CODEC_AV1:
+          isKeyframe = AOMDecoder::IsKeyframe(sample);
           break;
+#endif
+        default:
+          NS_WARNING("Cannot detect keyframes in unknown WebM video codec");
+          return NS_ERROR_FAILURE;
         }
-        isKeyframe = si.is_kf;
         if (isKeyframe) {
-          // We only look for resolution changes on keyframes for both VP8 and
-          // VP9. Other resolution changes are invalid.
-          if (mLastSeenFrameWidth.isSome() && mLastSeenFrameHeight.isSome() &&
-            (si.w != mLastSeenFrameWidth.value() ||
-              si.h != mLastSeenFrameHeight.value())) {
-            mInfo.mVideo.mDisplay = nsIntSize(si.w, si.h);
+          // For both VP8 and VP9, we only look for resolution changes
+          // on keyframes. Other resolution changes are invalid.
+          auto dimensions = nsIntSize(0, 0);
+          switch (mVideoCodec) {
+          case NESTEGG_CODEC_VP8:
+            dimensions = VPXDecoder::GetFrameSize(sample, VPXDecoder::Codec::VP8);
+            break;
+          case NESTEGG_CODEC_VP9:
+            dimensions = VPXDecoder::GetFrameSize(sample, VPXDecoder::Codec::VP9);
+            break;
+#ifdef MOZ_AV1
+          case NESTEGG_CODEC_AV1:
+            dimensions = AOMDecoder::GetFrameSize(sample);
+            break;
+#endif
+          }
+          if (mLastSeenFrameSize.isSome()
+              && (dimensions != mLastSeenFrameSize.value())) {
+            mInfo.mVideo.mDisplay = dimensions;
             mSharedVideoTrackInfo = new SharedTrackInfo(mInfo.mVideo, ++sStreamSourceID);
           }
-          mLastSeenFrameWidth = Some(si.w);
-          mLastSeenFrameHeight = Some(si.h);
+          mLastSeenFrameSize = Some(dimensions);
         }
       }
     }
@@ -668,7 +698,7 @@ WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType, MediaRawDataQueue *aSampl
     RefPtr<MediaRawData> sample = new MediaRawData(data, length);
     if (length && !sample->Data()) {
       // OOM.
-      return false;
+      return NS_ERROR_OUT_OF_MEMORY;
     }
     sample->mTimecode = tstamp;
     sample->mTime = tstamp;
@@ -721,11 +751,12 @@ WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType, MediaRawDataQueue *aSampl
     }
     aSamples->Push(sample);
   }
-  return true;
+  return NS_OK;
 }
 
-RefPtr<NesteggPacketHolder>
-WebMDemuxer::NextPacket(TrackInfo::TrackType aType)
+nsresult
+WebMDemuxer::NextPacket(TrackInfo::TrackType aType,
+                        RefPtr<NesteggPacketHolder>& aPacket)
 {
   bool isVideo = aType == TrackInfo::kVideoTrack;
 
@@ -734,56 +765,64 @@ WebMDemuxer::NextPacket(TrackInfo::TrackType aType)
   bool hasType = isVideo ? mHasVideo : mHasAudio;
 
   if (!hasType) {
-    return nullptr;
+    return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
   }
 
   // The packet queue for the type that we are interested in.
   WebMPacketQueue &packets = isVideo ? mVideoPackets : mAudioPackets;
 
   if (packets.GetSize() > 0) {
-    return packets.PopFront();
+    aPacket = packets.PopFront();
+    return NS_OK;
   }
 
   // Track we are interested in
   uint32_t ourTrack = isVideo ? mVideoTrack : mAudioTrack;
 
   do {
-    RefPtr<NesteggPacketHolder> holder = DemuxPacket(aType);
+    RefPtr<NesteggPacketHolder> holder;
+    nsresult rv = DemuxPacket(aType, holder);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
     if (!holder) {
-      return nullptr;
+      return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
     }
 
     if (ourTrack == holder->Track()) {
-      return holder;
+      aPacket = holder;
+      return NS_OK;
     }
   } while (true);
 }
 
-RefPtr<NesteggPacketHolder>
-WebMDemuxer::DemuxPacket(TrackInfo::TrackType aType)
+nsresult
+WebMDemuxer::DemuxPacket(TrackInfo::TrackType aType,
+                         RefPtr<NesteggPacketHolder>& aPacket)
 {
   nestegg_packet* packet;
   int r = nestegg_read_packet(Context(aType), &packet);
   if (r == 0) {
     nestegg_read_reset(Context(aType));
-    return nullptr;
+    return NS_ERROR_DOM_MEDIA_END_OF_STREAM;
   } else if (r < 0) {
-    return nullptr;
+    return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
   }
 
   unsigned int track = 0;
   r = nestegg_packet_track(packet, &track);
   if (r == -1) {
-    return nullptr;
+    return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
   }
 
   int64_t offset = Resource(aType).Tell();
   RefPtr<NesteggPacketHolder> holder = new NesteggPacketHolder();
   if (!holder->Init(packet, offset, track, false)) {
-    return nullptr;
+    return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
   }
 
-  return holder;
+  aPacket = holder;
+  return NS_OK;
 }
 
 void
@@ -943,7 +982,14 @@ WebMTrackDemuxer::Seek(media::TimeUnit aTime)
   media::TimeUnit seekTime = aTime;
   mSamples.Reset();
   mParent->SeekInternal(mType, aTime);
-  mParent->GetNextPacket(mType, &mSamples);
+  nsresult rv = mParent->GetNextPacket(mType, &mSamples);
+  if (NS_FAILED(rv)) {
+    if (rv == NS_ERROR_DOM_MEDIA_END_OF_STREAM) {
+      // Ignore the error for now, the next GetSample will be rejected with EOS.
+      return SeekPromise::CreateAndResolve(media::TimeUnit(), __func__);
+    }
+    return SeekPromise::CreateAndReject(rv, __func__);
+  }
   mNeedKeyframe = true;
 
   // Check what time we actually seeked to.
@@ -956,15 +1002,18 @@ WebMTrackDemuxer::Seek(media::TimeUnit aTime)
   return SeekPromise::CreateAndResolve(seekTime, __func__);
 }
 
-RefPtr<MediaRawData>
-WebMTrackDemuxer::NextSample()
+nsresult
+WebMTrackDemuxer::NextSample(RefPtr<MediaRawData>& aData)
 {
-  while (mSamples.GetSize() < 1 && mParent->GetNextPacket(mType, &mSamples)) {
+  nsresult rv;
+  while (mSamples.GetSize() < 1 &&
+         NS_SUCCEEDED((rv = mParent->GetNextPacket(mType, &mSamples)))) {
   }
   if (mSamples.GetSize()) {
-    return mSamples.PopFront();
+    aData = mSamples.PopFront();
+    return NS_OK;
   }
-  return nullptr;
+  return rv;
 }
 
 RefPtr<WebMTrackDemuxer::SamplesPromise>
@@ -973,9 +1022,12 @@ WebMTrackDemuxer::GetSamples(int32_t aNumSamples)
   RefPtr<SamplesHolder> samples = new SamplesHolder;
   MOZ_ASSERT(aNumSamples);
 
+  nsresult rv = NS_ERROR_DOM_MEDIA_END_OF_STREAM;
+
   while (aNumSamples) {
-    RefPtr<MediaRawData> sample(NextSample());
-    if (!sample) {
+    RefPtr<MediaRawData> sample;
+    rv = NextSample(sample);
+    if (NS_FAILED(rv)) {
       break;
     }
     if (mNeedKeyframe && !sample->mKeyframe) {
@@ -987,7 +1039,7 @@ WebMTrackDemuxer::GetSamples(int32_t aNumSamples)
   }
 
   if (samples->mSamples.IsEmpty()) {
-    return SamplesPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_END_OF_STREAM, __func__);
+    return SamplesPromise::CreateAndReject(rv, __func__);
   } else {
     UpdateSamples(samples->mSamples);
     return SamplesPromise::CreateAndResolve(samples, __func__);
@@ -1022,7 +1074,8 @@ WebMTrackDemuxer::SetNextKeyFrameTime()
   }
   // Demux and buffer frames until we find a keyframe.
   RefPtr<MediaRawData> sample;
-  while (!foundKeyframe && (sample = NextSample())) {
+  nsresult rv = NS_OK;
+  while (!foundKeyframe && NS_SUCCEEDED((rv = NextSample(sample)))) {
     if (sample->mKeyframe) {
       frameTime = sample->mTime;
       foundKeyframe = true;
@@ -1104,10 +1157,11 @@ WebMTrackDemuxer::SkipToNextRandomAccessPoint(media::TimeUnit aTimeThreshold)
   uint32_t parsed = 0;
   bool found = false;
   RefPtr<MediaRawData> sample;
+  nsresult rv = NS_OK;
   int64_t sampleTime;
 
   WEBM_DEBUG("TimeThreshold: %f", aTimeThreshold.ToSeconds());
-  while (!found && (sample = NextSample())) {
+  while (!found && NS_SUCCEEDED((rv = NextSample(sample)))) {
     parsed++;
     sampleTime = sample->mTime;
     if (sample->mKeyframe && sampleTime >= aTimeThreshold.ToMicroseconds()) {
@@ -1116,7 +1170,9 @@ WebMTrackDemuxer::SkipToNextRandomAccessPoint(media::TimeUnit aTimeThreshold)
       mSamples.PushFront(sample.forget());
     }
   }
-  SetNextKeyFrameTime();
+  if (NS_SUCCEEDED(rv)) {
+    SetNextKeyFrameTime();
+  }
   if (found) {
     WEBM_DEBUG("next sample: %f (parsed: %d)",
                media::TimeUnit::FromMicroseconds(sampleTime).ToSeconds(),
diff --git a/dom/media/webm/WebMDemuxer.h b/dom/media/webm/WebMDemuxer.h
index 6fff38e7d..36d381e57 100644
--- a/dom/media/webm/WebMDemuxer.h
+++ b/dom/media/webm/WebMDemuxer.h
@@ -8,9 +8,13 @@
 
 #include "nsTArray.h"
 #include "MediaDataDemuxer.h"
+#include "MediaResource.h"
 #include "NesteggPacketHolder.h"
 #include "mozilla/Move.h"
 
+#include <deque>
+#include <stdint.h>
+
 typedef struct nestegg nestegg;
 
 namespace mozilla {
@@ -111,7 +115,8 @@ public:
   bool GetOffsetForTime(uint64_t aTime, int64_t* aOffset);
 
   // Demux next WebM packet and append samples to MediaRawDataQueue
-  bool GetNextPacket(TrackInfo::TrackType aType, MediaRawDataQueue *aSamples);
+  nsresult GetNextPacket(TrackInfo::TrackType aType,
+                         MediaRawDataQueue *aSamples);
 
   nsresult Reset(TrackInfo::TrackType aType);
 
@@ -175,11 +180,13 @@ private:
   // Read a packet from the nestegg file. Returns nullptr if all packets for
   // the particular track have been read. Pass TrackInfo::kVideoTrack or
   // TrackInfo::kVideoTrack to indicate the type of the packet we want to read.
-  RefPtr<NesteggPacketHolder> NextPacket(TrackInfo::TrackType aType);
+  nsresult NextPacket(TrackInfo::TrackType aType,
+                      RefPtr<NesteggPacketHolder>& aPacket);
 
   // Internal method that demuxes the next packet from the stream. The caller
   // is responsible for making sure it doesn't get lost.
-  RefPtr<NesteggPacketHolder> DemuxPacket(TrackInfo::TrackType aType);
+  nsresult DemuxPacket(TrackInfo::TrackType aType,
+                       RefPtr<NesteggPacketHolder>& aPacket);
 
   // libnestegg audio and video context for webm container.
   // Access on reader's thread only.
@@ -237,8 +244,7 @@ private:
   int64_t mLastWebMBlockOffset;
   const bool mIsMediaSource;
 
-  Maybe<uint32_t> mLastSeenFrameWidth;
-  Maybe<uint32_t> mLastSeenFrameHeight;
+  Maybe<nsIntSize> mLastSeenFrameSize;
   // This will be populated only if a resolution change occurs, otherwise it
   // will be left as null so the original metadata is used
   RefPtr<SharedTrackInfo> mSharedVideoTrackInfo;
@@ -276,7 +282,7 @@ private:
   ~WebMTrackDemuxer();
   void UpdateSamples(nsTArray<RefPtr<MediaRawData>>& aSamples);
   void SetNextKeyFrameTime();
-  RefPtr<MediaRawData> NextSample ();
+  nsresult NextSample(RefPtr<MediaRawData>& aData);
   RefPtr<WebMDemuxer> mParent;
   TrackInfo::TrackType mType;
   UniquePtr<TrackInfo> mInfo;
diff --git a/dom/media/webrtc/RTCCertificate.cpp b/dom/media/webrtc/RTCCertificate.cpp
index 3f778bcbb..9f5e27c56 100644
--- a/dom/media/webrtc/RTCCertificate.cpp
+++ b/dom/media/webrtc/RTCCertificate.cpp
@@ -74,7 +74,7 @@ private:
     char buf[sizeof(randomName) * 2 + 4];
     PL_strncpy(buf, "CN=", 3);
     for (size_t i = 0; i < sizeof(randomName); ++i) {
-      snprintf(&buf[i * 2 + 3], 2, "%.2x", randomName[i]);
+      snprintf(&buf[i * 2 + 3], 3, "%.2x", randomName[i]);
     }
     buf[sizeof(buf) - 1] = '\0';
 
diff --git a/dom/moz.build b/dom/moz.build
index 358fc6411..54dc0510e 100644
--- a/dom/moz.build
+++ b/dom/moz.build
@@ -94,7 +94,6 @@ DIRS += [
     'xslt',
     'xul',
     'manifest',
-    'vr',
     'u2f',
     'console',
     'performance',
diff --git a/dom/network/TCPSocketChild.cpp b/dom/network/TCPSocketChild.cpp
index 8eb19a1db..72581ca9d 100644
--- a/dom/network/TCPSocketChild.cpp
+++ b/dom/network/TCPSocketChild.cpp
@@ -50,7 +50,6 @@ namespace dom {
 NS_IMPL_CYCLE_COLLECTION_CLASS(TCPSocketChildBase)
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(TCPSocketChildBase)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSocket)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
diff --git a/dom/notification/Notification.cpp b/dom/notification/Notification.cpp
index 1dd5724e4..a5aa48b00 100644
--- a/dom/notification/Notification.cpp
+++ b/dom/notification/Notification.cpp
@@ -11,7 +11,6 @@
 #include "mozilla/OwningNonNull.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/Services.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/Unused.h"
 
 #include "mozilla/dom/AppNotificationServiceOptionsBinding.h"
@@ -642,8 +641,6 @@ NotificationPermissionRequest::ResolvePromise()
     mCallback->Call(mPermission, error);
     rv = error.StealNSResult();
   }
-  Telemetry::Accumulate(
-    Telemetry::WEB_NOTIFICATION_REQUEST_PERMISSION_CALLBACK, !!mCallback);
   mPromise->MaybeResolve(mPermission);
   return rv;
 }
@@ -658,195 +655,6 @@ NotificationPermissionRequest::GetTypes(nsIArray** aTypes)
                                                          aTypes);
 }
 
-NS_IMPL_ISUPPORTS(NotificationTelemetryService, nsIObserver)
-
-NotificationTelemetryService::NotificationTelemetryService()
-  : mDNDRecorded(false)
-{}
-
-NotificationTelemetryService::~NotificationTelemetryService()
-{
-  Unused << NS_WARN_IF(NS_FAILED(RemovePermissionChangeObserver()));
-}
-
-/* static */ already_AddRefed<NotificationTelemetryService>
-NotificationTelemetryService::GetInstance()
-{
-  nsCOMPtr<nsISupports> telemetrySupports =
-    do_GetService(NOTIFICATIONTELEMETRYSERVICE_CONTRACTID);
-  if (!telemetrySupports) {
-    return nullptr;
-  }
-  RefPtr<NotificationTelemetryService> telemetry =
-    static_cast<NotificationTelemetryService*>(telemetrySupports.get());
-  return telemetry.forget();
-}
-
-nsresult
-NotificationTelemetryService::Init()
-{
-  nsresult rv = AddPermissionChangeObserver();
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  RecordPermissions();
-
-  return NS_OK;
-}
-
-nsresult
-NotificationTelemetryService::RemovePermissionChangeObserver()
-{
-  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
-  if (!obs) {
-    return NS_ERROR_OUT_OF_MEMORY;
-  }
-  return obs->RemoveObserver(this, "perm-changed");
-}
-
-nsresult
-NotificationTelemetryService::AddPermissionChangeObserver()
-{
-  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
-  if (!obs) {
-    return NS_ERROR_OUT_OF_MEMORY;
-  }
-  return obs->AddObserver(this, "perm-changed", false);
-}
-
-void
-NotificationTelemetryService::RecordPermissions()
-{
-  if (!Telemetry::CanRecordBase() || !Telemetry::CanRecordExtended()) {
-    return;
-  }
-
-  nsCOMPtr<nsIPermissionManager> permissionManager =
-    services::GetPermissionManager();
-  if (!permissionManager) {
-    return;
-  }
-
-  nsCOMPtr<nsISimpleEnumerator> enumerator;
-  nsresult rv = permissionManager->GetEnumerator(getter_AddRefs(enumerator));
-  if (NS_WARN_IF(NS_FAILED(rv))) {
-    return;
-  }
-
-  for (;;) {
-    bool hasMoreElements;
-    nsresult rv = enumerator->HasMoreElements(&hasMoreElements);
-    if (NS_WARN_IF(NS_FAILED(rv))) {
-      return;
-    }
-    if (!hasMoreElements) {
-      break;
-    }
-    nsCOMPtr<nsISupports> supportsPermission;
-    rv = enumerator->GetNext(getter_AddRefs(supportsPermission));
-    if (NS_WARN_IF(NS_FAILED(rv))) {
-      return;
-    }
-    uint32_t capability;
-    if (!GetNotificationPermission(supportsPermission, &capability)) {
-      continue;
-    }
-    if (capability == nsIPermissionManager::DENY_ACTION) {
-      Telemetry::Accumulate(Telemetry::WEB_NOTIFICATION_PERMISSIONS, 0);
-    } else if (capability == nsIPermissionManager::ALLOW_ACTION) {
-      Telemetry::Accumulate(Telemetry::WEB_NOTIFICATION_PERMISSIONS, 1);
-    }
-  }
-}
-
-bool
-NotificationTelemetryService::GetNotificationPermission(nsISupports* aSupports,
-                                                        uint32_t* aCapability)
-{
-  nsCOMPtr<nsIPermission> permission = do_QueryInterface(aSupports);
-  if (!permission) {
-    return false;
-  }
-  nsAutoCString type;
-  permission->GetType(type);
-  if (!type.Equals("desktop-notification")) {
-    return false;
-  }
-  permission->GetCapability(aCapability);
-  return true;
-}
-
-void
-NotificationTelemetryService::RecordDNDSupported()
-{
-  if (mDNDRecorded) {
-    return;
-  }
-
-  nsCOMPtr<nsIAlertsService> alertService =
-    do_GetService(NS_ALERTSERVICE_CONTRACTID);
-  if (!alertService) {
-    return;
-  }
-
-  nsCOMPtr<nsIAlertsDoNotDisturb> alertServiceDND =
-    do_QueryInterface(alertService);
-  if (!alertServiceDND) {
-    return;
-  }
-
-  mDNDRecorded = true;
-  bool isEnabled;
-  nsresult rv = alertServiceDND->GetManualDoNotDisturb(&isEnabled);
-  if (NS_FAILED(rv)) {
-    return;
-  }
-
-  Telemetry::Accumulate(
-    Telemetry::ALERTS_SERVICE_DND_SUPPORTED_FLAG, true);
-}
-
-nsresult
-NotificationTelemetryService::RecordSender(nsIPrincipal* aPrincipal)
-{
-  if (!Telemetry::CanRecordBase() || !Telemetry::CanRecordExtended() ||
-      !nsAlertsUtils::IsActionablePrincipal(aPrincipal)) {
-    return NS_OK;
-  }
-  nsAutoString origin;
-  nsresult rv = Notification::GetOrigin(aPrincipal, origin);
-  if (NS_FAILED(rv)) {
-    return rv;
-  }
-  if (!mOrigins.Contains(origin)) {
-    mOrigins.PutEntry(origin);
-    Telemetry::Accumulate(Telemetry::WEB_NOTIFICATION_SENDERS, 1);
-  }
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-NotificationTelemetryService::Observe(nsISupports* aSubject,
-                                      const char* aTopic,
-                                      const char16_t* aData)
-{
-  uint32_t capability;
-  if (strcmp("perm-changed", aTopic) ||
-      !NS_strcmp(u"cleared", aData) ||
-      !GetNotificationPermission(aSubject, &capability)) {
-    return NS_OK;
-  }
-  if (!NS_strcmp(u"deleted", aData)) {
-    if (capability == nsIPermissionManager::DENY_ACTION) {
-      Telemetry::Accumulate(
-        Telemetry::WEB_NOTIFICATION_PERMISSION_REMOVED, 0);
-    } else if (capability == nsIPermissionManager::ALLOW_ACTION) {
-      Telemetry::Accumulate(
-        Telemetry::WEB_NOTIFICATION_PERMISSION_REMOVED, 1);
-    }
-  }
-  return NS_OK;
-}
-
 // Observer that the alert service calls to do common tasks and/or dispatch to the
 // specific observer for the context e.g. main thread, worker, or service worker.
 class NotificationObserver final : public nsIObserver
@@ -1407,7 +1215,6 @@ NotificationObserver::Observe(nsISupports* aSubject, const char* aTopic,
   AssertIsOnMainThread();
 
   if (!strcmp("alertdisablecallback", aTopic)) {
-    Telemetry::Accumulate(Telemetry::WEB_NOTIFICATION_MENU, 1);
     if (XRE_IsParentProcess()) {
       return Notification::RemovePermission(mPrincipal);
     }
@@ -1417,10 +1224,7 @@ NotificationObserver::Observe(nsISupports* aSubject, const char* aTopic,
     ContentChild::GetSingleton()->SendDisableNotifications(
       IPC::Principal(mPrincipal));
     return NS_OK;
-  } else if (!strcmp("alertclickcallback", aTopic)) {
-    Telemetry::Accumulate(Telemetry::WEB_NOTIFICATION_CLICKED, 1);
   } else if (!strcmp("alertsettingscallback", aTopic)) {
-    Telemetry::Accumulate(Telemetry::WEB_NOTIFICATION_MENU, 2);
     if (XRE_IsParentProcess()) {
       return Notification::OpenSettings(mPrincipal);
     }
@@ -1431,23 +1235,7 @@ NotificationObserver::Observe(nsISupports* aSubject, const char* aTopic,
     return NS_OK;
   } else if (!strcmp("alertshow", aTopic) ||
              !strcmp("alertfinished", aTopic)) {
-    RefPtr<NotificationTelemetryService> telemetry =
-      NotificationTelemetryService::GetInstance();
-    if (telemetry) {
-      // Record whether "do not disturb" is supported after the first
-      // notification, to account for falling back to XUL alerts.
-      telemetry->RecordDNDSupported();
-      if (!mInPrivateBrowsing) {
-        // Ignore senders in private windows.
-        Unused << NS_WARN_IF(NS_FAILED(telemetry->RecordSender(mPrincipal)));
-      }
-    }
     Unused << NS_WARN_IF(NS_FAILED(AdjustPushQuota(aTopic)));
-
-    if (!strcmp("alertshow", aTopic)) {
-      // Record notifications actually shown (e.g. don't count if DND is on).
-      Telemetry::Accumulate(Telemetry::WEB_NOTIFICATION_SHOWN, 1);
-    }
   }
 
   return mObserver->Observe(aSubject, aTopic, aData);
diff --git a/dom/notification/Notification.h b/dom/notification/Notification.h
index a2c4b5c68..11958f6ad 100644
--- a/dom/notification/Notification.h
+++ b/dom/notification/Notification.h
@@ -18,9 +18,6 @@
 #include "nsTHashtable.h"
 #include "nsWeakReference.h"
 
-#define NOTIFICATIONTELEMETRYSERVICE_CONTRACTID \
-  "@mozilla.org/notificationTelemetryService;1"
-
 class nsIPrincipal;
 class nsIVariant;
 
@@ -49,36 +46,6 @@ public:
   Notify(workers::Status aStatus) override;
 };
 
-// Records telemetry probes at application startup, when a notification is
-// shown, and when the notification permission is revoked for a site.
-class NotificationTelemetryService final : public nsIObserver
-{
-public:
-  NS_DECL_ISUPPORTS
-  NS_DECL_NSIOBSERVER
-
-  NotificationTelemetryService();
-
-  static already_AddRefed<NotificationTelemetryService> GetInstance();
-
-  nsresult Init();
-  void RecordDNDSupported();
-  void RecordPermissions();
-  nsresult RecordSender(nsIPrincipal* aPrincipal);
-
-private:
-  virtual ~NotificationTelemetryService();
-
-  nsresult AddPermissionChangeObserver();
-  nsresult RemovePermissionChangeObserver();
-
-  bool GetNotificationPermission(nsISupports* aSupports,
-                                 uint32_t* aCapability);
-
-  bool mDNDRecorded;
-  nsTHashtable<nsStringHashKey> mOrigins;
-};
-
 /*
  * Notifications on workers introduce some lifetime issues. The property we
  * are trying to satisfy is:
@@ -143,7 +110,6 @@ class Notification : public DOMEventTargetHelper
   friend class ServiceWorkerNotificationObserver;
   friend class WorkerGetRunnable;
   friend class WorkerNotificationObserver;
-  friend class NotificationTelemetryService;
 
 public:
   IMPL_EVENT_HANDLER(click)
diff --git a/dom/performance/PerformanceMainThread.cpp b/dom/performance/PerformanceMainThread.cpp
index 64c06d3ea..5a84f5fb1 100644
--- a/dom/performance/PerformanceMainThread.cpp
+++ b/dom/performance/PerformanceMainThread.cpp
@@ -27,7 +27,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(PerformanceMainThread,
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTiming,
                                     mNavigation,
                                     mDocEntry)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(PerformanceMainThread,
diff --git a/dom/performance/PerformanceObserver.cpp b/dom/performance/PerformanceObserver.cpp
index d02acfb09..7bf194bb7 100644
--- a/dom/performance/PerformanceObserver.cpp
+++ b/dom/performance/PerformanceObserver.cpp
@@ -34,7 +34,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(PerformanceObserver)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCallback)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPerformance)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(PerformanceObserver)
 
diff --git a/dom/plugins/base/nptypes.h b/dom/plugins/base/nptypes.h
index 12a5fb78e..c36532472 100644
--- a/dom/plugins/base/nptypes.h
+++ b/dom/plugins/base/nptypes.h
@@ -22,18 +22,6 @@
   typedef unsigned int uint32_t;
   typedef long long int64_t;
   typedef unsigned long long uint64_t;
-#elif defined(_AIX) || defined(__sun) || defined(__osf__) || defined(IRIX) || defined(HPUX)
-  /*
-   * AIX and SunOS ship a inttypes.h header that defines [u]int32_t,
-   * but not bool for C.
-   */
-  #include <inttypes.h>
-
-  #ifndef __cplusplus
-    typedef int bool;
-    #define true   1
-    #define false  0
-  #endif
 #elif defined(bsdi) || defined(FREEBSD) || defined(OPENBSD)
   /*
    * BSD/OS, FreeBSD, and OpenBSD ship sys/types.h that define int32_t and
diff --git a/dom/plugins/base/nsPluginHost.cpp b/dom/plugins/base/nsPluginHost.cpp
index 916bdea0f..c3de136d0 100644
--- a/dom/plugins/base/nsPluginHost.cpp
+++ b/dom/plugins/base/nsPluginHost.cpp
@@ -2148,11 +2148,7 @@ nsresult nsPluginHost::ScanPluginsDirectory(nsIFile *pluginsDir,
       nsPluginInfo info;
       memset(&info, 0, sizeof(info));
       nsresult res;
-      // Opening a block for the telemetry AutoTimer
-      {
-        Telemetry::AutoTimer<Telemetry::PLUGIN_LOAD_METADATA> telemetry;
-        res = pluginFile.GetPluginInfo(info, &library);
-      }
+      res = pluginFile.GetPluginInfo(info, &library);
       // if we don't have mime type don't proceed, this is not a plugin
       if (NS_FAILED(res) || !info.fMimeTypeArray) {
         RefPtr<nsInvalidPluginTag> invalidTag = new nsInvalidPluginTag(filePath.get(),
@@ -2410,8 +2406,6 @@ nsPluginHost::FindPluginsInContent(bool aCreatePluginList, bool* aPluginsChanged
 // This is needed in ReloadPlugins to prevent possible recursive reloads
 nsresult nsPluginHost::FindPlugins(bool aCreatePluginList, bool * aPluginsChanged)
 {
-  Telemetry::AutoTimer<Telemetry::FIND_PLUGINS> telemetry;
-
   NS_ENSURE_ARG_POINTER(aPluginsChanged);
 
   *aPluginsChanged = false;
@@ -3412,7 +3406,6 @@ nsPluginHost::StopPluginInstance(nsNPAPIPluginInstance* aInstance)
     return NS_OK;
   }
 
-  Telemetry::AutoTimer<Telemetry::PLUGIN_SHUTDOWN_MS> timer;
   aInstance->Stop();
 
   // if the instance does not want to be 'cached' just remove it
diff --git a/dom/plugins/base/nsPluginsDirUnix.cpp b/dom/plugins/base/nsPluginsDirUnix.cpp
index 6d112b4fe..e6956c34c 100644
--- a/dom/plugins/base/nsPluginsDirUnix.cpp
+++ b/dom/plugins/base/nsPluginsDirUnix.cpp
@@ -19,17 +19,7 @@
 #include "nsIPrefService.h"
 
 #define LOCAL_PLUGIN_DLL_SUFFIX ".so"
-#if defined(__hpux)
-#define DEFAULT_X11_PATH "/usr/lib/X11R6/"
-#undef LOCAL_PLUGIN_DLL_SUFFIX
-#define LOCAL_PLUGIN_DLL_SUFFIX ".sl"
-#define LOCAL_PLUGIN_DLL_ALT_SUFFIX ".so"
-#elif defined(_AIX)
-#define DEFAULT_X11_PATH "/usr/lib"
-#define LOCAL_PLUGIN_DLL_ALT_SUFFIX ".a"
-#elif defined(SOLARIS)
-#define DEFAULT_X11_PATH "/usr/openwin/lib/"
-#elif defined(LINUX)
+#if defined(LINUX)
 #define DEFAULT_X11_PATH "/usr/X11R6/lib/"
 #elif defined(__APPLE__)
 #define DEFAULT_X11_PATH "/usr/X11R6/lib"
@@ -102,11 +92,7 @@ static bool LoadExtraSharedLib(const char *name, char **soname, bool tryToGetSon
 
 #define PLUGIN_MAX_NUMBER_OF_EXTRA_LIBS 32
 #define PREF_PLUGINS_SONAME "plugin.soname.list"
-#if defined(SOLARIS) || defined(HPUX)
-#define DEFAULT_EXTRA_LIBS_LIST "libXt" LOCAL_PLUGIN_DLL_SUFFIX ":libXext" LOCAL_PLUGIN_DLL_SUFFIX ":libXm" LOCAL_PLUGIN_DLL_SUFFIX
-#else
 #define DEFAULT_EXTRA_LIBS_LIST "libXt" LOCAL_PLUGIN_DLL_SUFFIX ":libXext" LOCAL_PLUGIN_DLL_SUFFIX
-#endif
 /*
  this function looks for
  user_pref("plugin.soname.list", "/usr/X11R6/lib/libXt.so.6:libXext.so");
@@ -280,15 +266,9 @@ nsresult nsPluginFile::LoadPlugin(PRLibrary **outLibrary)
     // work fine.
 
 
-#if defined(SOLARIS) || defined(HPUX)
-    // Acrobat/libXm: Lazy resolving might cause crash later (bug 211587)
-    *outLibrary = PR_LoadLibraryWithFlags(libSpec, PR_LD_NOW);
-    pLibrary = *outLibrary;
-#else
     // Some dlopen() doesn't recover from a failed PR_LD_NOW (bug 223744)
     *outLibrary = PR_LoadLibraryWithFlags(libSpec, 0);
     pLibrary = *outLibrary;
-#endif
     if (!pLibrary) {
         LoadExtraSharedLibs();
         // try reload plugin once more
diff --git a/dom/plugins/ipc/PluginAsyncSurrogate.cpp b/dom/plugins/ipc/PluginAsyncSurrogate.cpp
index da07116cc..3fe4c7168 100644
--- a/dom/plugins/ipc/PluginAsyncSurrogate.cpp
+++ b/dom/plugins/ipc/PluginAsyncSurrogate.cpp
@@ -504,8 +504,6 @@ PluginAsyncSurrogate::WaitForInit()
   if (mAcceptCalls) {
     return true;
   }
-  Telemetry::AutoTimer<Telemetry::BLOCKED_ON_PLUGINASYNCSURROGATE_WAITFORINIT_MS>
-    timer(mParent->GetHistogramKey());
   bool result = false;
   MOZ_ASSERT(mParent);
   if (mParent->IsChrome()) {
diff --git a/dom/plugins/ipc/PluginHangUIParent.cpp b/dom/plugins/ipc/PluginHangUIParent.cpp
index 5114f2e9a..908182a22 100644
--- a/dom/plugins/ipc/PluginHangUIParent.cpp
+++ b/dom/plugins/ipc/PluginHangUIParent.cpp
@@ -8,7 +8,6 @@
 
 #include "PluginHangUIParent.h"
 
-#include "mozilla/Telemetry.h"
 #include "mozilla/ipc/ProtocolUtils.h"
 #include "mozilla/plugins/PluginModuleParent.h"
 
@@ -48,14 +47,6 @@ public:
   NS_IMETHOD
   Run() override
   {
-    mozilla::Telemetry::Accumulate(
-              mozilla::Telemetry::PLUGIN_HANG_UI_USER_RESPONSE, mResponseCode);
-    mozilla::Telemetry::Accumulate(
-              mozilla::Telemetry::PLUGIN_HANG_UI_DONT_ASK, mDontAskCode);
-    mozilla::Telemetry::Accumulate(
-              mozilla::Telemetry::PLUGIN_HANG_UI_RESPONSE_TIME, mResponseTimeMs);
-    mozilla::Telemetry::Accumulate(
-              mozilla::Telemetry::PLUGIN_HANG_TIME, mTimeoutMs + mResponseTimeMs);
     return NS_OK;
   }
 
diff --git a/dom/plugins/ipc/PluginInstanceParent.cpp b/dom/plugins/ipc/PluginInstanceParent.cpp
index 02f0641f7..bdd15ca99 100644
--- a/dom/plugins/ipc/PluginInstanceParent.cpp
+++ b/dom/plugins/ipc/PluginInstanceParent.cpp
@@ -9,7 +9,6 @@
 
 #include "mozilla/BasicEvents.h"
 #include "mozilla/Preferences.h"
-#include "mozilla/Telemetry.h"
 #include "PluginInstanceParent.h"
 #include "BrowserStreamParent.h"
 #include "PluginAsyncSurrogate.h"
@@ -206,12 +205,8 @@ NPError
 PluginInstanceParent::Destroy()
 {
     NPError retval;
-    {   // Scope for timer
-        Telemetry::AutoTimer<Telemetry::BLOCKED_ON_PLUGIN_INSTANCE_DESTROY_MS>
-            timer(Module()->GetHistogramKey());
-        if (!CallNPP_Destroy(&retval)) {
-            retval = NPERR_GENERIC_ERROR;
-        }
+    if (!CallNPP_Destroy(&retval)) {
+        retval = NPERR_GENERIC_ERROR;
     }
 
 #if defined(OS_WIN)
@@ -1786,9 +1781,6 @@ PluginInstanceParent::NPP_NewStream(NPMIMEType type, NPStream* stream,
         return NPERR_GENERIC_ERROR;
     }
 
-    Telemetry::AutoTimer<Telemetry::BLOCKED_ON_PLUGIN_STREAM_INIT_MS>
-        timer(Module()->GetHistogramKey());
-
     NPError err = NPERR_NO_ERROR;
     if (mParent->IsStartingAsync()) {
         MOZ_ASSERT(mSurrogate);
@@ -2504,6 +2496,5 @@ PluginInstanceParent::RecordDrawingModel()
     }
     MOZ_ASSERT(mode >= 0);
 
-    Telemetry::Accumulate(Telemetry::PLUGIN_DRAWING_MODEL, mode);
     mLastRecordedDrawingModel = mode;
 }
diff --git a/dom/plugins/ipc/PluginModuleParent.cpp b/dom/plugins/ipc/PluginModuleParent.cpp
index 2489baf16..4a509676d 100755
--- a/dom/plugins/ipc/PluginModuleParent.cpp
+++ b/dom/plugins/ipc/PluginModuleParent.cpp
@@ -20,7 +20,6 @@
 #include "mozilla/Preferences.h"
 #include "mozilla/ProcessHangMonitor.h"
 #include "mozilla/Services.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/Unused.h"
 #include "nsAutoPtr.h"
 #include "nsCRT.h"
@@ -93,11 +92,6 @@ mozilla::plugins::SetupBridge(uint32_t aPluginId,
         return true;
     }
     PluginModuleChromeParent* chromeParent = static_cast<PluginModuleChromeParent*>(plugin->GetLibrary());
-    /*
-     *  We can't accumulate BLOCKED_ON_PLUGIN_MODULE_INIT_MS until here because
-     *  its histogram key is not available until *after* NP_Initialize.
-     */
-    chromeParent->AccumulateModuleInitBlockedTime();
     *rv = chromeParent->GetRunID(runID);
     if (NS_FAILED(*rv)) {
         return true;
@@ -336,16 +330,13 @@ PluginModuleContentParent::LoadModule(uint32_t aPluginId,
     dom::ContentChild* cp = dom::ContentChild::GetSingleton();
     nsresult rv;
     uint32_t runID;
-    TimeStamp sendLoadPluginStart = TimeStamp::Now();
     if (!cp->SendLoadPlugin(aPluginId, &rv, &runID) ||
         NS_FAILED(rv)) {
         return nullptr;
     }
-    TimeStamp sendLoadPluginEnd = TimeStamp::Now();
 
     PluginModuleContentParent* parent = mapping->GetModule();
     MOZ_ASSERT(parent);
-    parent->mTimeBlocked += (sendLoadPluginEnd - sendLoadPluginStart);
 
     if (!mapping->IsChannelOpened()) {
         // mapping is linked into PluginModuleMapping::sModuleListHead and is
@@ -441,7 +432,6 @@ PluginModuleChromeParent::LoadModule(const char* aFilePath, uint32_t aPluginId,
                                          aPluginTag->mSupportsAsyncInit));
     UniquePtr<LaunchCompleteTask> onLaunchedRunnable(new LaunchedTask(parent));
     parent->mSubprocess->SetCallRunnableImmediately(!parent->mIsStartingAsync);
-    TimeStamp launchStart = TimeStamp::Now();
     bool launched = parent->mSubprocess->Launch(Move(onLaunchedRunnable),
                                                 aPluginTag->mSandboxLevel);
     if (!launched) {
@@ -460,8 +450,6 @@ PluginModuleChromeParent::LoadModule(const char* aFilePath, uint32_t aPluginId,
             return nullptr;
         }
     }
-    TimeStamp launchEnd = TimeStamp::Now();
-    parent->mTimeBlocked = (launchEnd - launchStart);
     return parent.forget();
 }
 
@@ -1172,11 +1160,6 @@ PluginModuleParent::GetRunID(uint32_t* aRunID)
 void
 PluginModuleChromeParent::ActorDestroy(ActorDestroyReason why)
 {
-    if (why == AbnormalShutdown) {
-        Telemetry::Accumulate(Telemetry::SUBPROCESS_ABNORMAL_ABORT,
-                              NS_LITERAL_CSTRING("plugin"), 1);
-    }
-
     // We can't broadcast settings changes anymore.
     UnregisterSettingsCallbacks();
 
@@ -1764,15 +1747,12 @@ PluginModuleChromeParent::NP_Initialize(NPNetscapeFuncs* bFuncs, NPPluginFuncs*
     PluginSettings settings;
     GetSettings(&settings);
 
-    TimeStamp callNpInitStart = TimeStamp::Now();
     // Asynchronous case
     if (mIsStartingAsync) {
         if (!SendAsyncNP_Initialize(settings)) {
             Close();
             return NS_ERROR_FAILURE;
         }
-        TimeStamp callNpInitEnd = TimeStamp::Now();
-        mTimeBlocked += (callNpInitEnd - callNpInitStart);
         return NS_OK;
     }
 
@@ -1785,8 +1765,6 @@ PluginModuleChromeParent::NP_Initialize(NPNetscapeFuncs* bFuncs, NPPluginFuncs*
         Close();
         return NS_ERROR_FAILURE;
     }
-    TimeStamp callNpInitEnd = TimeStamp::Now();
-    mTimeBlocked += (callNpInitEnd - callNpInitStart);
 
     RecvNP_InitializeResult(*error);
 
@@ -1888,13 +1866,10 @@ PluginModuleChromeParent::NP_Initialize(NPNetscapeFuncs* bFuncs, NPError* error)
     PluginSettings settings;
     GetSettings(&settings);
 
-    TimeStamp callNpInitStart = TimeStamp::Now();
     if (mIsStartingAsync) {
         if (!SendAsyncNP_Initialize(settings)) {
             return NS_ERROR_FAILURE;
         }
-        TimeStamp callNpInitEnd = TimeStamp::Now();
-        mTimeBlocked += (callNpInitEnd - callNpInitStart);
         return NS_OK;
     }
 
@@ -1902,8 +1877,6 @@ PluginModuleChromeParent::NP_Initialize(NPNetscapeFuncs* bFuncs, NPError* error)
         Close();
         return NS_ERROR_FAILURE;
     }
-    TimeStamp callNpInitEnd = TimeStamp::Now();
-    mTimeBlocked += (callNpInitEnd - callNpInitStart);
     RecvNP_InitializeResult(*error);
     return NS_OK;
 }
@@ -2200,18 +2173,6 @@ public:
   }
 };
 
-void
-PluginModuleParent::AccumulateModuleInitBlockedTime()
-{
-    if (mPluginName.IsEmpty()) {
-        GetPluginDetails();
-    }
-    Telemetry::Accumulate(Telemetry::BLOCKED_ON_PLUGIN_MODULE_INIT_MS,
-                          GetHistogramKey(),
-                          static_cast<uint32_t>(mTimeBlocked.ToMilliseconds()));
-    mTimeBlocked = TimeDuration();
-}
-
 nsresult
 PluginModuleParent::NPP_NewInternal(NPMIMEType pluginType, NPP instance,
                                     uint16_t mode,
@@ -2223,13 +2184,6 @@ PluginModuleParent::NPP_NewInternal(NPMIMEType pluginType, NPP instance,
     if (mPluginName.IsEmpty()) {
         GetPluginDetails();
         InitQuirksModes(nsDependentCString(pluginType));
-        /** mTimeBlocked measures the time that the main thread has been blocked
-         *  on plugin module initialization. As implemented, this is the sum of
-         *  plugin-container launch + toolhelp32 snapshot + NP_Initialize.
-         *  We don't accumulate its value until here because the plugin info
-         *  for its histogram key is not available until *after* NP_Initialize.
-         */
-        AccumulateModuleInitBlockedTime();
     }
 
     nsCaseInsensitiveUTF8StringArrayComparator comparator;
@@ -2294,27 +2248,23 @@ PluginModuleParent::NPP_NewInternal(NPMIMEType pluginType, NPP instance,
         return NS_ERROR_FAILURE;
     }
 
-    {   // Scope for timer
-        Telemetry::AutoTimer<Telemetry::BLOCKED_ON_PLUGIN_INSTANCE_INIT_MS>
-            timer(GetHistogramKey());
-        if (mIsStartingAsync) {
-            MOZ_ASSERT(surrogate);
-            surrogate->AsyncCallDeparting();
-            if (!SendAsyncNPP_New(parentInstance)) {
+    if (mIsStartingAsync) {
+        MOZ_ASSERT(surrogate);
+        surrogate->AsyncCallDeparting();
+        if (!SendAsyncNPP_New(parentInstance)) {
+            *error = NPERR_GENERIC_ERROR;
+            return NS_ERROR_FAILURE;
+        }
+        *error = NPERR_NO_ERROR;
+    } else {
+        if (!CallSyncNPP_New(parentInstance, error)) {
+            // if IPC is down, we'll get an immediate "failed" return, but
+            // without *error being set.  So make sure that the error
+            // condition is signaled to nsNPAPIPluginInstance
+            if (NPERR_NO_ERROR == *error) {
                 *error = NPERR_GENERIC_ERROR;
-                return NS_ERROR_FAILURE;
-            }
-            *error = NPERR_NO_ERROR;
-        } else {
-            if (!CallSyncNPP_New(parentInstance, error)) {
-                // if IPC is down, we'll get an immediate "failed" return, but
-                // without *error being set.  So make sure that the error
-                // condition is signaled to nsNPAPIPluginInstance
-                if (NPERR_NO_ERROR == *error) {
-                    *error = NPERR_GENERIC_ERROR;
-                }
-                return NS_ERROR_FAILURE;
             }
+            return NS_ERROR_FAILURE;
         }
     }
 
diff --git a/dom/plugins/ipc/PluginModuleParent.h b/dom/plugins/ipc/PluginModuleParent.h
index 0ceed6efd..909e8fe35 100644
--- a/dom/plugins/ipc/PluginModuleParent.h
+++ b/dom/plugins/ipc/PluginModuleParent.h
@@ -115,8 +115,6 @@ public:
         return mPluginName + mPluginVersion;
     }
 
-    void AccumulateModuleInitBlockedTime();
-
     virtual nsresult GetRunID(uint32_t* aRunID) override;
     virtual void SetHasLocalInstance() override {
         mHadLocalInstance = true;
@@ -315,7 +313,6 @@ protected:
     nsString mBrowserDumpID;
     nsString mHangID;
     RefPtr<nsIObserver> mProfilerObserver;
-    TimeDuration mTimeBlocked;
     nsCString mPluginName;
     nsCString mPluginVersion;
     int32_t mSandboxLevel;
diff --git a/dom/presentation/provider/PresentationControlService.js b/dom/presentation/provider/PresentationControlService.js
index fe61d26d6..e9f92247f 100644
--- a/dom/presentation/provider/PresentationControlService.js
+++ b/dom/presentation/provider/PresentationControlService.js
@@ -100,7 +100,6 @@ PresentationControlService.prototype = {
 
       if (aCert) {
         this._serverSocket.serverCert = aCert;
-        this._serverSocket.setSessionCache(false);
         this._serverSocket.setSessionTickets(false);
         let requestCert = Ci.nsITLSServerSocket.REQUEST_NEVER;
         this._serverSocket.setRequestClientCertificate(requestCert);
diff --git a/dom/promise/Promise.cpp b/dom/promise/Promise.cpp
index 557f3a1f9..f636a9101 100644
--- a/dom/promise/Promise.cpp
+++ b/dom/promise/Promise.cpp
@@ -413,7 +413,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Promise)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mResolveCallbacks)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRejectCallbacks)
 #endif // SPIDERMONKEY_PROMISE
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Promise)
@@ -1995,7 +1994,6 @@ NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(CountdownHolder)
 NS_IMPL_CYCLE_COLLECTION_TRACE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(CountdownHolder)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPromise)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
diff --git a/dom/promise/PromiseCallback.cpp b/dom/promise/PromiseCallback.cpp
index 3f4a689ae..6ecf983b7 100644
--- a/dom/promise/PromiseCallback.cpp
+++ b/dom/promise/PromiseCallback.cpp
@@ -47,7 +47,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ResolvePromiseCallback,
                                                   PromiseCallback)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPromise)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ResolvePromiseCallback)
@@ -107,7 +106,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(RejectPromiseCallback,
                                                   PromiseCallback)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPromise)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(RejectPromiseCallback)
@@ -170,7 +168,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(InvokePromiseFuncCallback,
                                                   PromiseCallback)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPromiseFunc)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(InvokePromiseFuncCallback)
@@ -256,7 +253,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(WrapperPromiseCallback,
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mResolveFunc)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRejectFunc)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCallback)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(WrapperPromiseCallback)
diff --git a/dom/push/PushSubscriptionOptions.cpp b/dom/push/PushSubscriptionOptions.cpp
index bc4fead1e..39252e9e8 100644
--- a/dom/push/PushSubscriptionOptions.cpp
+++ b/dom/push/PushSubscriptionOptions.cpp
@@ -36,7 +36,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(PushSubscriptionOptions)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(PushSubscriptionOptions)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mGlobal)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(PushSubscriptionOptions)
   NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
diff --git a/dom/security/nsContentSecurityManager.cpp b/dom/security/nsContentSecurityManager.cpp
index 570730312..f2cbc8fcf 100644
--- a/dom/security/nsContentSecurityManager.cpp
+++ b/dom/security/nsContentSecurityManager.cpp
@@ -92,6 +92,55 @@ nsContentSecurityManager::AllowTopLevelNavigationToDataURI(nsIChannel* aChannel)
   return false;
 }
 
+/* static */ nsresult
+nsContentSecurityManager::CheckFTPSubresourceLoad(nsIChannel* aChannel)
+{
+  // We dissallow using FTP resources as a subresource everywhere.
+  // The only valid way to use FTP resources is loading it as
+  // a top level document.
+
+  nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo();
+  if (!loadInfo) {
+    return NS_OK;
+  }
+
+  nsContentPolicyType type = loadInfo->GetExternalContentPolicyType();
+  if (type == nsIContentPolicy::TYPE_DOCUMENT) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri));
+  NS_ENSURE_SUCCESS(rv, rv); 
+  if (!uri) {
+    return NS_OK;
+  }
+
+  bool isFtpURI = (NS_SUCCEEDED(uri->SchemeIs("ftp", &isFtpURI)) && isFtpURI);
+  if (!isFtpURI) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIDocument> doc;
+  if (nsINode* node = loadInfo->LoadingNode()) {
+    doc = node->OwnerDoc();
+  }
+
+  nsAutoCString spec;
+  uri->GetSpec(spec);
+  NS_ConvertUTF8toUTF16 specUTF16(NS_UnescapeURL(spec));
+  const char16_t* params[] = { specUTF16.get() };
+
+  nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
+                                  NS_LITERAL_CSTRING("FTP_URI_BLOCKED"),
+                                  doc,
+                                  nsContentUtils::eSECURITY_PROPERTIES,
+                                  "BlockSubresourceFTP",
+                                  params, ArrayLength(params));
+
+  return NS_ERROR_CONTENT_BLOCKED;
+}
+
 static nsresult
 ValidateSecurityFlags(nsILoadInfo* aLoadInfo)
 {
@@ -574,6 +623,10 @@ nsContentSecurityManager::doContentSecurityCheck(nsIChannel* aChannel,
   rv = DoContentSecurityChecks(aChannel, loadInfo);
   NS_ENSURE_SUCCESS(rv, rv);
 
+  // Apply this after CSP checks to allow CSP reporting.
+  rv = CheckFTPSubresourceLoad(aChannel);
+  NS_ENSURE_SUCCESS(rv, rv);
+
   // now lets set the initalSecurityFlag for subsequent calls
   loadInfo->SetInitialSecurityCheckDone(true);
 
@@ -591,6 +644,9 @@ nsContentSecurityManager::AsyncOnChannelRedirect(nsIChannel* aOldChannel,
   // Are we enforcing security using LoadInfo?
   if (loadInfo && loadInfo->GetEnforceSecurity()) {
     nsresult rv = CheckChannel(aNewChannel);
+    if (NS_SUCCEEDED(rv)) {
+      rv = CheckFTPSubresourceLoad(aNewChannel);
+    }
     if (NS_FAILED(rv)) {
       aOldChannel->Cancel(rv);
       return rv;
diff --git a/dom/security/nsContentSecurityManager.h b/dom/security/nsContentSecurityManager.h
index bab847743..750dd8803 100644
--- a/dom/security/nsContentSecurityManager.h
+++ b/dom/security/nsContentSecurityManager.h
@@ -36,6 +36,7 @@ public:
 
 private:
   static nsresult CheckChannel(nsIChannel* aChannel);
+  static nsresult CheckFTPSubresourceLoad(nsIChannel* aChannel);
 
   virtual ~nsContentSecurityManager() {}
 
diff --git a/dom/security/nsMixedContentBlocker.cpp b/dom/security/nsMixedContentBlocker.cpp
index c03628da0..543429aff 100644
--- a/dom/security/nsMixedContentBlocker.cpp
+++ b/dom/security/nsMixedContentBlocker.cpp
@@ -35,7 +35,6 @@
 #include "nsISiteSecurityService.h"
 
 #include "mozilla/Logging.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/ipc/URIUtils.h"
 
@@ -814,17 +813,13 @@ nsMixedContentBlocker::ShouldLoad(bool aHadInsecureImageRedirect,
   //
   // We do not count requests aHadInsecureImageRedirect=true, since these are
   // just an artifact of the image caching system.
-  bool active = (classification == eMixedScript);
   if (!aHadInsecureImageRedirect) {
-    if (XRE_IsParentProcess()) {
-      AccumulateMixedContentHSTS(innerContentLocation, active);
-    } else {
+    if (!XRE_IsParentProcess()) {
       // Ask the parent process to do the same call
       mozilla::dom::ContentChild* cc = mozilla::dom::ContentChild::GetSingleton();
       if (cc) {
         mozilla::ipc::URIParams uri;
         SerializeURI(innerContentLocation, uri);
-        cc->SendAccumulateMixedContentHSTS(uri, active);
       }
     }
   }
@@ -977,50 +972,3 @@ enum MixedContentHSTSState {
   MCB_HSTS_ACTIVE_NO_HSTS    = 2,
   MCB_HSTS_ACTIVE_WITH_HSTS  = 3
 };
-
-// Record information on when HSTS would have made mixed content not mixed
-// content (regardless of whether it was actually blocked)
-void
-nsMixedContentBlocker::AccumulateMixedContentHSTS(nsIURI* aURI, bool aActive)
-{
-  // This method must only be called in the parent, because
-  // nsSiteSecurityService is only available in the parent
-  if (!XRE_IsParentProcess()) {
-    MOZ_ASSERT(false);
-    return;
-  }
-
-  bool hsts;
-  nsresult rv;
-  nsCOMPtr<nsISiteSecurityService> sss = do_GetService(NS_SSSERVICE_CONTRACTID, &rv);
-  if (NS_FAILED(rv)) {
-    return;
-  }
-  rv = sss->IsSecureURI(nsISiteSecurityService::HEADER_HSTS, aURI, 0, nullptr, &hsts);
-  if (NS_FAILED(rv)) {
-    return;
-  }
-
-  // states: would upgrade, hsts info cached
-  // active, passive
-  //
-  if (!aActive) {
-    if (!hsts) {
-      Telemetry::Accumulate(Telemetry::MIXED_CONTENT_HSTS,
-                            MCB_HSTS_PASSIVE_NO_HSTS);
-    }
-    else {
-      Telemetry::Accumulate(Telemetry::MIXED_CONTENT_HSTS,
-                            MCB_HSTS_PASSIVE_WITH_HSTS);
-    }
-  } else {
-    if (!hsts) {
-      Telemetry::Accumulate(Telemetry::MIXED_CONTENT_HSTS,
-                            MCB_HSTS_ACTIVE_NO_HSTS);
-    }
-    else {
-      Telemetry::Accumulate(Telemetry::MIXED_CONTENT_HSTS,
-                            MCB_HSTS_ACTIVE_WITH_HSTS);
-    }
-  }
-}
\ No newline at end of file
diff --git a/dom/security/nsMixedContentBlocker.h b/dom/security/nsMixedContentBlocker.h
index 56ab9621f..068068b25 100644
--- a/dom/security/nsMixedContentBlocker.h
+++ b/dom/security/nsMixedContentBlocker.h
@@ -61,9 +61,6 @@ public:
                              nsISupports* aExtra,
                              nsIPrincipal* aRequestPrincipal,
                              int16_t* aDecision);
-  static void AccumulateMixedContentHSTS(nsIURI* aURI,
-                                         bool aActive);
-
 
   static bool sBlockMixedScript;
   static bool sBlockMixedDisplay;
diff --git a/dom/security/test/cors/test_CrossSiteXHR.html b/dom/security/test/cors/test_CrossSiteXHR.html
index b3cda3b87..d9aef5c60 100644
--- a/dom/security/test/cors/test_CrossSiteXHR.html
+++ b/dom/security/test/cors/test_CrossSiteXHR.html
@@ -743,7 +743,7 @@ function runTest() {
             is(res.responseHeaders[header], test.responseHeaders[header],
                "|xhr.getResponseHeader()|wrong response header (" + header + ") in test for " +
                test.toSource());
-            is(res.allResponseHeaders[header], test.responseHeaders[header],
+            is(res.allResponseHeaders[header.toLowerCase()], test.responseHeaders[header],
               "|xhr.getAllResponseHeaderss()|wrong response header (" + header + ") in test for " +
               test.toSource());
           }
diff --git a/dom/smil/nsSMILAnimationController.cpp b/dom/smil/nsSMILAnimationController.cpp
index 0dd616346..69956203e 100644
--- a/dom/smil/nsSMILAnimationController.cpp
+++ b/dom/smil/nsSMILAnimationController.cpp
@@ -233,7 +233,7 @@ void
 nsSMILAnimationController::NotifyRefreshDriverCreated(
     nsRefreshDriver* aRefreshDriver)
 {
-  if (!mPauseState) {
+  if (!mPauseState && mChildContainerTable.Count()) {
     MaybeStartSampling(aRefreshDriver);
   }
 }
diff --git a/dom/storage/DOMStorageCache.cpp b/dom/storage/DOMStorageCache.cpp
index 811f79fd3..a2b5a6f73 100644
--- a/dom/storage/DOMStorageCache.cpp
+++ b/dom/storage/DOMStorageCache.cpp
@@ -85,7 +85,6 @@ DOMStorageCache::DOMStorageCache(const nsACString* aOriginNoSuffix)
 , mInitialized(false)
 , mPersistent(false)
 , mSessionOnlyDataSetActive(false)
-, mPreloadTelemetryRecorded(false)
 {
   MOZ_COUNT_CTOR(DOMStorageCache);
 }
@@ -178,7 +177,7 @@ DOMStorageCache::DataSet(const DOMStorage* aStorage)
     // Session only data set is demanded but not filled with
     // current data set, copy to session only set now.
 
-    WaitForPreload(Telemetry::LOCALDOMSTORAGE_SESSIONONLY_PRELOAD_BLOCKING_MS);
+    WaitForPreload();
 
     Data& defaultSet = mData[kDefaultSet];
     Data& sessionSet = mData[kSessionSet];
@@ -298,49 +297,18 @@ DOMStorageCache::KeepAlive()
   mKeepAliveTimer.swap(timer);
 }
 
-namespace {
-
-// The AutoTimer provided by telemetry headers is only using static,
-// i.e. compile time known ID, but here we know the ID only at run time.
-// Hence a new class.
-class TelemetryAutoTimer
-{
-public:
-  explicit TelemetryAutoTimer(Telemetry::ID aId)
-    : id(aId), start(TimeStamp::Now()) {}
-  ~TelemetryAutoTimer()
-    { Telemetry::AccumulateDelta_impl<Telemetry::Millisecond>::compute(id, start); }
-private:
-  Telemetry::ID id;
-  const TimeStamp start;
-};
-
-} // namespace
-
 void
-DOMStorageCache::WaitForPreload(Telemetry::ID aTelemetryID)
+DOMStorageCache::WaitForPreload()
 {
   if (!mPersistent) {
     return;
   }
 
   bool loaded = mLoaded;
-
-  // Telemetry of rates of pending preloads
-  if (!mPreloadTelemetryRecorded) {
-    mPreloadTelemetryRecorded = true;
-    Telemetry::Accumulate(
-      Telemetry::LOCALDOMSTORAGE_PRELOAD_PENDING_ON_FIRST_ACCESS,
-      !loaded);
-  }
-
   if (loaded) {
     return;
   }
 
-  // Measure which operation blocks and for how long
-  TelemetryAutoTimer timer(aTelemetryID);
-
   // If preload already started (i.e. we got some first data, but not all)
   // SyncPreload will just wait for it to finish rather then synchronously
   // read from the database.  It seems to me more optimal.
@@ -357,7 +325,7 @@ nsresult
 DOMStorageCache::GetLength(const DOMStorage* aStorage, uint32_t* aRetval)
 {
   if (Persist(aStorage)) {
-    WaitForPreload(Telemetry::LOCALDOMSTORAGE_GETLENGTH_BLOCKING_MS);
+    WaitForPreload();
     if (NS_FAILED(mLoadResult)) {
       return mLoadResult;
     }
@@ -375,7 +343,7 @@ DOMStorageCache::GetKey(const DOMStorage* aStorage, uint32_t aIndex, nsAString&
   // maybe we need to have a lazily populated key array here or
   // something?
   if (Persist(aStorage)) {
-    WaitForPreload(Telemetry::LOCALDOMSTORAGE_GETKEY_BLOCKING_MS);
+    WaitForPreload();
     if (NS_FAILED(mLoadResult)) {
       return mLoadResult;
     }
@@ -397,7 +365,7 @@ void
 DOMStorageCache::GetKeys(const DOMStorage* aStorage, nsTArray<nsString>& aKeys)
 {
   if (Persist(aStorage)) {
-    WaitForPreload(Telemetry::LOCALDOMSTORAGE_GETALLKEYS_BLOCKING_MS);
+    WaitForPreload();
   }
 
   if (NS_FAILED(mLoadResult)) {
@@ -414,7 +382,7 @@ DOMStorageCache::GetItem(const DOMStorage* aStorage, const nsAString& aKey,
                          nsAString& aRetval)
 {
   if (Persist(aStorage)) {
-    WaitForPreload(Telemetry::LOCALDOMSTORAGE_GETVALUE_BLOCKING_MS);
+    WaitForPreload();
     if (NS_FAILED(mLoadResult)) {
       return mLoadResult;
     }
@@ -439,7 +407,7 @@ DOMStorageCache::SetItem(const DOMStorage* aStorage, const nsAString& aKey,
   int64_t delta = 0;
 
   if (Persist(aStorage)) {
-    WaitForPreload(Telemetry::LOCALDOMSTORAGE_SETVALUE_BLOCKING_MS);
+    WaitForPreload();
     if (NS_FAILED(mLoadResult)) {
       return mLoadResult;
     }
@@ -488,7 +456,7 @@ DOMStorageCache::RemoveItem(const DOMStorage* aStorage, const nsAString& aKey,
                             nsString& aOld)
 {
   if (Persist(aStorage)) {
-    WaitForPreload(Telemetry::LOCALDOMSTORAGE_REMOVEKEY_BLOCKING_MS);
+    WaitForPreload();
     if (NS_FAILED(mLoadResult)) {
       return mLoadResult;
     }
@@ -527,9 +495,8 @@ DOMStorageCache::Clear(const DOMStorage* aStorage)
     // We need to preload all data (know the size) before we can proceeed
     // to correctly decrease cached usage number.
     // XXX as in case of unload, this is not technically needed now, but
-    // after super-scope quota introduction we have to do this.  Get telemetry
-    // right now.
-    WaitForPreload(Telemetry::LOCALDOMSTORAGE_CLEAR_BLOCKING_MS);
+    // after super-scope quota introduction we have to do this.
+    WaitForPreload();
     if (NS_FAILED(mLoadResult)) {
       // When we failed to load data from the database, force delete of the
       // scope data and make use of the storage possible again.
@@ -599,9 +566,8 @@ DOMStorageCache::UnloadItems(uint32_t aUnloadFlags)
     // Must wait for preload to pass correct usage to ProcessUsageDelta
     // XXX this is not technically needed right now since there is just
     // per-origin isolated quota handling, but when we introduce super-
-    // -scope quotas, we have to do this.  Better to start getting
-    // telemetry right now.
-    WaitForPreload(Telemetry::LOCALDOMSTORAGE_UNLOAD_BLOCKING_MS);
+    // -scope quotas, we have to do this.
+    WaitForPreload();
 
     mData[kDefaultSet].mKeys.Clear();
     ProcessUsageDelta(kDefaultSet, -mData[kDefaultSet].mOriginQuotaUsage);
@@ -620,7 +586,7 @@ DOMStorageCache::UnloadItems(uint32_t aUnloadFlags)
 
 #ifdef DOM_STORAGE_TESTS
   if (aUnloadFlags & kTestReload) {
-    WaitForPreload(Telemetry::LOCALDOMSTORAGE_UNLOAD_BLOCKING_MS);
+    WaitForPreload();
 
     mData[kDefaultSet].mKeys.Clear();
     mLoaded = false; // This is only used in testing code
diff --git a/dom/storage/DOMStorageCache.h b/dom/storage/DOMStorageCache.h
index 01cf6b3ea..4469152a2 100644
--- a/dom/storage/DOMStorageCache.h
+++ b/dom/storage/DOMStorageCache.h
@@ -14,7 +14,6 @@
 #include "nsDataHashtable.h"
 #include "nsHashKeys.h"
 #include "mozilla/Monitor.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/Atomics.h"
 
 namespace mozilla {
@@ -168,7 +167,7 @@ private:
 
 private:
   // Synchronously blocks until the cache is fully loaded from the database
-  void WaitForPreload(mozilla::Telemetry::ID aTelemetryID);
+  void WaitForPreload();
 
   // Helper to get one of the 3 data sets (regular, private, session)
   Data& DataSet(const DOMStorage* aStorage);
@@ -241,9 +240,6 @@ private:
   // Drops back to false when session-only data are cleared from chrome.
   bool mSessionOnlyDataSetActive : 1;
 
-  // Whether we have already captured state of the cache preload on our first access.
-  bool mPreloadTelemetryRecorded : 1;
-
   // DOMStorageDBThread on the parent or single process,
   // DOMStorageDBChild on the child process.
   static DOMStorageDBBridge* sDatabase;
diff --git a/dom/storage/DOMStorageDBThread.cpp b/dom/storage/DOMStorageDBThread.cpp
index 183be5c5c..f86dbad9c 100644
--- a/dom/storage/DOMStorageDBThread.cpp
+++ b/dom/storage/DOMStorageDBThread.cpp
@@ -163,8 +163,6 @@ DOMStorageDBThread::Shutdown()
     return NS_ERROR_NOT_INITIALIZED;
   }
 
-  Telemetry::AutoTimer<Telemetry::LOCALDOMSTORAGE_SHUTDOWN_DATABASE_MS> timer;
-
   {
     MonitorAutoLock monitor(mThreadObserver->GetMonitor());
 
diff --git a/dom/svg/DOMSVGLength.cpp b/dom/svg/DOMSVGLength.cpp
index 574617045..c72c3e383 100644
--- a/dom/svg/DOMSVGLength.cpp
+++ b/dom/svg/DOMSVGLength.cpp
@@ -43,7 +43,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGLength)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mList)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSVGElement)
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGLength)
diff --git a/dom/svg/DOMSVGLengthList.cpp b/dom/svg/DOMSVGLengthList.cpp
index 9d93546d9..88ecd6007 100644
--- a/dom/svg/DOMSVGLengthList.cpp
+++ b/dom/svg/DOMSVGLengthList.cpp
@@ -55,7 +55,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGLengthList)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGLengthList)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAList)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGLengthList)
   NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
diff --git a/dom/svg/DOMSVGNumber.cpp b/dom/svg/DOMSVGNumber.cpp
index 97d80d4d0..6b9528606 100644
--- a/dom/svg/DOMSVGNumber.cpp
+++ b/dom/svg/DOMSVGNumber.cpp
@@ -35,7 +35,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGNumber)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mList)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGNumber)
   NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
diff --git a/dom/svg/DOMSVGNumberList.cpp b/dom/svg/DOMSVGNumberList.cpp
index 00fb7ba4d..85322688f 100644
--- a/dom/svg/DOMSVGNumberList.cpp
+++ b/dom/svg/DOMSVGNumberList.cpp
@@ -55,7 +55,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGNumberList)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGNumberList)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAList)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGNumberList)
   NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
diff --git a/dom/svg/DOMSVGPathSeg.cpp b/dom/svg/DOMSVGPathSeg.cpp
index 95be3521e..a15bf42e9 100644
--- a/dom/svg/DOMSVGPathSeg.cpp
+++ b/dom/svg/DOMSVGPathSeg.cpp
@@ -31,7 +31,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGPathSeg)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mList)
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGPathSeg)
diff --git a/dom/svg/DOMSVGPathSegList.cpp b/dom/svg/DOMSVGPathSegList.cpp
index 0b811cdb1..36768ea34 100644
--- a/dom/svg/DOMSVGPathSegList.cpp
+++ b/dom/svg/DOMSVGPathSegList.cpp
@@ -36,7 +36,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGPathSegList)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGPathSegList)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGPathSegList)
   NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
diff --git a/dom/svg/DOMSVGPointList.cpp b/dom/svg/DOMSVGPointList.cpp
index 966ef476e..ca06bd270 100644
--- a/dom/svg/DOMSVGPointList.cpp
+++ b/dom/svg/DOMSVGPointList.cpp
@@ -55,7 +55,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGPointList)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGPointList)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGPointList)
   NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
diff --git a/dom/svg/DOMSVGTransformList.cpp b/dom/svg/DOMSVGTransformList.cpp
index 30760bc6d..e4bde9aeb 100644
--- a/dom/svg/DOMSVGTransformList.cpp
+++ b/dom/svg/DOMSVGTransformList.cpp
@@ -54,7 +54,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGTransformList)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGTransformList)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAList)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGTransformList)
   NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
diff --git a/dom/svg/SVGTransform.cpp b/dom/svg/SVGTransform.cpp
index b73018d1c..1cba997eb 100644
--- a/dom/svg/SVGTransform.cpp
+++ b/dom/svg/SVGTransform.cpp
@@ -51,7 +51,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mList)
   SVGMatrix* matrix =
     SVGMatrixTearoffTable().GetTearoff(tmp);
   CycleCollectionNoteChild(cb, matrix, "matrix");
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(SVGTransform)
diff --git a/dom/svg/SVGUseElement.cpp b/dom/svg/SVGUseElement.cpp
index 4911e2cac..9212ab1aa 100644
--- a/dom/svg/SVGUseElement.cpp
+++ b/dom/svg/SVGUseElement.cpp
@@ -15,6 +15,7 @@
 #include "mozilla/dom/Element.h"
 #include "nsContentUtils.h"
 #include "nsIURI.h"
+#include "nsSVGEffects.h"
 
 NS_IMPL_NS_NEW_NAMESPACED_SVG_ELEMENT(Use)
 
@@ -418,11 +419,15 @@ SVGUseElement::LookupHref()
     return;
   }
 
+  nsCOMPtr<nsIURI> originURI =
+    mOriginal ? mOriginal->GetBaseURI() : GetBaseURI();
+  nsCOMPtr<nsIURI> baseURI = nsContentUtils::IsLocalRefURL(href)
+    ? nsSVGEffects::GetBaseURLForLocalRef(this, originURI)
+    : originURI;
+
   nsCOMPtr<nsIURI> targetURI;
-  nsCOMPtr<nsIURI> baseURI = mOriginal ? mOriginal->GetBaseURI() : GetBaseURI();
   nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
                                             GetComposedDoc(), baseURI);
-
   mSource.Reset(this, targetURI);
 }
 
diff --git a/dom/svg/nsISVGPoint.cpp b/dom/svg/nsISVGPoint.cpp
index 1c1971004..f4fdb9dd0 100644
--- a/dom/svg/nsISVGPoint.cpp
+++ b/dom/svg/nsISVGPoint.cpp
@@ -32,7 +32,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsISVGPoint)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mList)
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsISVGPoint)
diff --git a/dom/svg/nsSVGElement.h b/dom/svg/nsSVGElement.h
index 42bc05746..257ed7a2e 100644
--- a/dom/svg/nsSVGElement.h
+++ b/dom/svg/nsSVGElement.h
@@ -715,7 +715,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER                            \
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END                                          \
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(_val)                                \
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(_element)                                \
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS                           \
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END                                        \
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(_val)                                   \
 NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER                             \
diff --git a/dom/svg/test/reftest_viewport_noninteger.html b/dom/svg/test/reftest_viewport_noninteger.html
new file mode 100644
index 000000000..3f4852b53
--- /dev/null
+++ b/dom/svg/test/reftest_viewport_noninteger.html
@@ -0,0 +1,175 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>SVG size test</title>
+    <style>
+      body {
+        margin: 30px;
+        font-family: sans-serif;
+      }
+
+      #tests {
+        display: grid;
+        grid-template-columns: repeat(4, 1fr);
+        grid-gap: 30px;
+      }
+
+      #tests div:hover {
+        opacity: 1 !important;
+      }
+
+      #tests p {
+        text-decoration: underline dotted black;
+      }
+
+      svg {
+        background: lightgrey;
+      }
+    </style>
+  </head>
+  <body>
+    <h1>SVG size test</h1>
+
+    <p>The grey boxes below are <code>&lt;svg&gt;</code> elements.</p>
+    <p>All SVGs in each row should have the exact same size.</p>
+    <p>Each row has its own viewBox width and height: <code>viewBox="0 0 width height"</code>.</p>
+    <p>Each column has its own width/height styling. For example, <code>style="width: 200px; height: auto;"</code>.</p>
+    <p>The first column has both an explicit widht and an explicit height, so there's not much that can go wrong there. It acts as a reference.</p>
+    <p>The first row has integer viewBox width and height. Firefox then sizes all SVGs correctly.</p>
+    <p>The remaining rows have at least one non-integer viewBox width and height. Firefox then sizes the SVGs a bit wrong.</p>
+    <p>Chrome, Safari and Edge seem to pass all tests.</p>
+
+    <p id="summary"></p>
+
+    <div id="tests"></div>
+
+    <script>
+      const testsElement = document.getElementById("tests");
+      const summaryElement = document.getElementById("summary");
+
+      // Turn for instance `2.3` into `230` (px). Round to avoid floating point
+      // issues.
+      const scale = (number) => Math.round(100 * number);
+
+      const widths = [2, 2.3, 2.5, 2.8];
+      const heights = [3, 3.3, 3.5, 3.8];
+
+      let numPassed = 0;
+      let numFailed = 0;
+
+      for (const width of widths) {
+        for (const height of heights) {
+          const variations = [
+            {width, height},
+            {width: "auto", height},
+            {width, height: "auto"},
+            {width: "auto", height: "auto"},
+          ];
+
+          for (const variation of variations) {
+            const cellElement = document.createElement("div");
+
+            const titleElement = document.createElement("h2");
+            titleElement.appendChild(makeTitle(width, height, variation));
+
+            const sizeElement = document.createElement("p");
+
+            const svgWrapperElement = document.createElement("div");
+            svgWrapperElement.style.width =
+              variation.width === "auto" && variation.height === "auto"
+                ? `${scale(width)}px`
+                : "auto";
+
+            const svgElement = document.createElementNS("http://www.w3.org/2000/svg", "svg");
+            svgElement.setAttribute("viewBox", `0 0 ${width} ${height}`);
+            svgElement.style.width =
+              typeof variation.width === "number"
+                ? `${scale(variation.width)}px`
+                : variation.width;
+            svgElement.style.height =
+              typeof variation.height === "number"
+                ? `${scale(variation.height)}px`
+                : variation.height;
+
+            svgWrapperElement.appendChild(svgElement);
+
+            cellElement.appendChild(titleElement);
+            cellElement.appendChild(sizeElement);
+            cellElement.appendChild(svgWrapperElement);
+
+            testsElement.appendChild(cellElement);
+
+            const rect = svgElement.getBoundingClientRect();
+            const actual = {
+              width: Math.round(rect.width),
+              height: Math.round(rect.height),
+            };
+            const expected = {
+              width: scale(width),
+              height: scale(height),
+            };
+            const passed =
+              actual.width === expected.width &&
+              actual.height === expected.height;
+
+            const icon = passed ? "✔" : "✘";
+            const iconText = passed ? "PASS" : "FAIL";
+            const expectedText = passed ? "" : `\nExpected size: ${expected.width}x${expected.height}`;
+            sizeElement.textContent = `${icon} ${actual.width}x${actual.height}`;
+            sizeElement.title = `${iconText}. Actual size, as measured by element.getBoundingClientRect().${expectedText}`;
+            sizeElement.style.color = passed ? "lime" : "red";
+            sizeElement.style.fontWeight = passed ? "normal" : "bold";
+
+            cellElement.style.opacity = passed ? 0.5 : 1;
+
+            if (passed) {
+              numPassed++;
+            } else {
+              numFailed++;
+            }
+          }
+        }
+      }
+
+      const numTotal = numPassed + numFailed;
+      const passed = numFailed === 0;
+      const icon = passed ? "✔" : "✘";
+      summaryElement.textContent = `${icon} ${numPassed}/${numTotal} tests passed.`;
+      summaryElement.style.color = passed ? "lime" : "red";
+      summaryElement.style.fontWeight = "bold";
+
+      function makeTitle(width, height, variation) {
+        const fragment = document.createDocumentFragment();
+
+        const first = document.createElement("abbr");
+        first.textContent = `${width}/${height}`;
+        first.title = `SVG viewBox width/height: viewBox="0 0 ${width} ${height}"`;
+
+        const separator = document.createTextNode(" | ");
+
+        const second = document.createElement("abbr");
+
+        const widthString = typeof variation.width === "number" ? "px" : variation.width;
+        const heightString = typeof variation.height === "number" ? "px" : variation.height;
+        second.textContent = `${widthString}/${heightString}`;
+
+        const widthExplanation =
+          typeof variation.width === "number"
+            ? "explicit width (px)"
+            : `${variation.width} width`
+        const heightExplanation =
+          typeof variation.height === "number"
+            ? "explicit height (px)"
+            : `${variation.height} height`
+        second.title = `${widthExplanation}, ${heightExplanation}`;
+
+        fragment.appendChild(first);
+        fragment.appendChild(separator);
+        fragment.appendChild(second);
+
+        return fragment;
+      }
+    </script>
+  </body>
+</html>
diff --git a/dom/system/mac/CoreLocationLocationProvider.mm b/dom/system/mac/CoreLocationLocationProvider.mm
index b39582a9e..7a3feba97 100644
--- a/dom/system/mac/CoreLocationLocationProvider.mm
+++ b/dom/system/mac/CoreLocationLocationProvider.mm
@@ -13,7 +13,6 @@
 #include "CoreLocationLocationProvider.h"
 #include "nsCocoaFeatures.h"
 #include "prtime.h"
-#include "mozilla/Telemetry.h"
 #include "MLSFallback.h"
 
 #include <CoreLocation/CLError.h>
@@ -103,7 +102,6 @@ static const CLLocationAccuracy kDEFAULT_ACCURACY = kCLLocationAccuracyNearestTe
                       PR_Now() / PR_USEC_PER_MSEC);
 
   mProvider->Update(geoPosition);
-  Telemetry::Accumulate(Telemetry::GEOLOCATION_OSX_SOURCE_IS_MLS, false);
 }
 @end
 
@@ -127,7 +125,6 @@ CoreLocationLocationProvider::MLSUpdate::Update(nsIDOMGeoPosition *position)
     return NS_ERROR_FAILURE;
   }
   mParentLocationProvider.Update(position);
-  Telemetry::Accumulate(Telemetry::GEOLOCATION_OSX_SOURCE_IS_MLS, true);
   return NS_OK;
 }
 NS_IMETHODIMP
diff --git a/dom/system/windows/WindowsLocationProvider.cpp b/dom/system/windows/WindowsLocationProvider.cpp
index fa7f8d8be..9da7bcc30 100644
--- a/dom/system/windows/WindowsLocationProvider.cpp
+++ b/dom/system/windows/WindowsLocationProvider.cpp
@@ -10,7 +10,6 @@
 #include "nsComponentManagerUtils.h"
 #include "prtime.h"
 #include "MLSFallback.h"
-#include "mozilla/Telemetry.h"
 
 namespace mozilla {
 namespace dom {
@@ -34,7 +33,6 @@ WindowsLocationProvider::MLSUpdate::Update(nsIDOMGeoPosition *aPosition)
   if (!coords) {
     return NS_ERROR_FAILURE;
   }
-  Telemetry::Accumulate(Telemetry::GEOLOCATION_WIN8_SOURCE_IS_MLS, true);
   return mCallback->Update(aPosition);
 }
 NS_IMETHODIMP
@@ -176,8 +174,6 @@ LocationEvent::OnLocationChanged(REFIID aReportType,
                       PR_Now() / PR_USEC_PER_MSEC);
   mCallback->Update(position);
 
-  Telemetry::Accumulate(Telemetry::GEOLOCATION_WIN8_SOURCE_IS_MLS, false);
-
   return S_OK;
 }
 
diff --git a/dom/url/URLSearchParams.cpp b/dom/url/URLSearchParams.cpp
index d9492f81c..f762299f8 100644
--- a/dom/url/URLSearchParams.cpp
+++ b/dom/url/URLSearchParams.cpp
@@ -314,14 +314,6 @@ URLSearchParams::URLSearchParams(nsISupports* aParent,
 {
 }
 
-URLSearchParams::URLSearchParams(nsISupports* aParent,
-                                 const URLSearchParams& aOther)
-  : mParams(new URLParams(*aOther.mParams.get()))
-  , mParent(aParent)
-  , mObserver(nullptr)
-{
-}
-
 URLSearchParams::~URLSearchParams()
 {
   DeleteAll();
@@ -335,34 +327,43 @@ URLSearchParams::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
 
 /* static */ already_AddRefed<URLSearchParams>
 URLSearchParams::Constructor(const GlobalObject& aGlobal,
-                             const nsAString& aInit,
+                             const USVStringSequenceSequenceOrUSVStringUSVStringRecordOrUSVString& aInit,
                              ErrorResult& aRv)
 {
   RefPtr<URLSearchParams> sp =
     new URLSearchParams(aGlobal.GetAsSupports(), nullptr);
 
-  NS_ConvertUTF16toUTF8 input(aInit);
-
-  if (StringBeginsWith(input, NS_LITERAL_CSTRING("?"))) {
-    sp->ParseInput(Substring(input, 1, input.Length() - 1));
+  if (aInit.IsUSVString()) {
+    NS_ConvertUTF16toUTF8 input(aInit.GetAsUSVString());
+    if (StringBeginsWith(input, NS_LITERAL_CSTRING("?"))) {
+      sp->ParseInput(Substring(input, 1, input.Length() - 1));
+    } else {
+      sp->ParseInput(input);
+    }
+  } else if (aInit.IsUSVStringSequenceSequence()) {
+    const Sequence<Sequence<nsString>>& list =
+      aInit.GetAsUSVStringSequenceSequence();
+    for (uint32_t i = 0; i < list.Length(); ++i) {
+      const Sequence<nsString>& item = list[i];
+      if (item.Length() != 2) {
+        aRv.Throw(NS_ERROR_DOM_TYPE_ERR);
+        return nullptr;
+      }
+      sp->Append(item[0], item[1]);
+    }
+  } else if (aInit.IsUSVStringUSVStringRecord()) {
+    const Record<nsString, nsString>& record =
+      aInit.GetAsUSVStringUSVStringRecord();
+    for (auto& entry : record.Entries()) {
+      sp->Append(entry.mKey, entry.mValue);
+    }
   } else {
-    sp->ParseInput(input);
+    MOZ_CRASH("URLSearchParams: Invalid string");
   }
 
   return sp.forget();
 }
 
-/* static */ already_AddRefed<URLSearchParams>
-URLSearchParams::Constructor(const GlobalObject& aGlobal,
-                             URLSearchParams& aInit,
-                             ErrorResult& aRv)
-{
-  RefPtr<URLSearchParams> sp =
-    new URLSearchParams(aGlobal.GetAsSupports(), aInit);
-
-  return sp.forget();
-}
-
 void
 URLSearchParams::ParseInput(const nsACString& aInput)
 {
diff --git a/dom/url/URLSearchParams.h b/dom/url/URLSearchParams.h
index 4b0aaa991..9fefd78dd 100644
--- a/dom/url/URLSearchParams.h
+++ b/dom/url/URLSearchParams.h
@@ -20,6 +20,7 @@ namespace mozilla {
 namespace dom {
 
 class URLSearchParams;
+class USVStringSequenceSequenceOrUSVStringUSVStringRecordOrUSVString;
 
 class URLSearchParamsObserver : public nsISupports
 {
@@ -43,14 +44,6 @@ public:
     DeleteAll();
   }
 
-  explicit URLParams(const URLParams& aOther)
-    : mParams(aOther.mParams)
-  {}
-
-  URLParams(const URLParams&& aOther)
-    : mParams(Move(aOther.mParams))
-  {}
-
   class ForEachIterator
   {
   public:
@@ -144,9 +137,6 @@ public:
   explicit URLSearchParams(nsISupports* aParent,
                            URLSearchParamsObserver* aObserver=nullptr);
 
-  URLSearchParams(nsISupports* aParent,
-                  const URLSearchParams& aOther);
-
   // WebIDL methods
   nsISupports* GetParentObject() const
   {
@@ -157,11 +147,8 @@ public:
   WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
 
   static already_AddRefed<URLSearchParams>
-  Constructor(const GlobalObject& aGlobal, const nsAString& aInit,
-              ErrorResult& aRv);
-
-  static already_AddRefed<URLSearchParams>
-  Constructor(const GlobalObject& aGlobal, URLSearchParams& aInit,
+  Constructor(const GlobalObject& aGlobal,
+              const USVStringSequenceSequenceOrUSVStringUSVStringRecordOrUSVString& aInit,
               ErrorResult& aRv);
 
   void ParseInput(const nsACString& aInput);
diff --git a/dom/vr/VRDisplay.cpp b/dom/vr/VRDisplay.cpp
deleted file mode 100644
index 80922422f..000000000
--- a/dom/vr/VRDisplay.cpp
+++ /dev/null
@@ -1,802 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "nsWrapperCache.h"
-
-#include "mozilla/dom/Element.h"
-#include "mozilla/dom/ElementBinding.h"
-#include "mozilla/dom/Promise.h"
-#include "mozilla/dom/VRDisplay.h"
-#include "mozilla/HoldDropJSObjects.h"
-#include "mozilla/dom/VRDisplayBinding.h"
-#include "Navigator.h"
-#include "gfxVR.h"
-#include "VRDisplayClient.h"
-#include "VRManagerChild.h"
-#include "VRDisplayPresentation.h"
-#include "nsIObserverService.h"
-#include "nsIFrame.h"
-#include "nsISupportsPrimitives.h"
-
-using namespace mozilla::gfx;
-
-namespace mozilla {
-namespace dom {
-
-VRFieldOfView::VRFieldOfView(nsISupports* aParent,
-                             double aUpDegrees, double aRightDegrees,
-                             double aDownDegrees, double aLeftDegrees)
-  : mParent(aParent)
-  , mUpDegrees(aUpDegrees)
-  , mRightDegrees(aRightDegrees)
-  , mDownDegrees(aDownDegrees)
-  , mLeftDegrees(aLeftDegrees)
-{
-}
-
-VRFieldOfView::VRFieldOfView(nsISupports* aParent, const gfx::VRFieldOfView& aSrc)
-  : mParent(aParent)
-  , mUpDegrees(aSrc.upDegrees)
-  , mRightDegrees(aSrc.rightDegrees)
-  , mDownDegrees(aSrc.downDegrees)
-  , mLeftDegrees(aSrc.leftDegrees)
-{
-}
-
-bool
-VRDisplayCapabilities::HasPosition() const
-{
-  return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_Position);
-}
-
-bool
-VRDisplayCapabilities::HasOrientation() const
-{
-  return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_Orientation);
-}
-
-bool
-VRDisplayCapabilities::HasExternalDisplay() const
-{
-  return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_External);
-}
-
-bool
-VRDisplayCapabilities::CanPresent() const
-{
-  return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_Present);
-}
-
-uint32_t
-VRDisplayCapabilities::MaxLayers() const
-{
-  return CanPresent() ? 1 : 0;
-}
-
-/*static*/ bool
-VRDisplay::RefreshVRDisplays(uint64_t aWindowId)
-{
-  gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
-  return vm && vm->RefreshVRDisplaysWithCallback(aWindowId);
-}
-
-/*static*/ void
-VRDisplay::UpdateVRDisplays(nsTArray<RefPtr<VRDisplay>>& aDisplays, nsPIDOMWindowInner* aWindow)
-{
-  nsTArray<RefPtr<VRDisplay>> displays;
-
-  gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
-  nsTArray<RefPtr<gfx::VRDisplayClient>> updatedDisplays;
-  if (vm && vm->GetVRDisplays(updatedDisplays)) {
-    for (size_t i = 0; i < updatedDisplays.Length(); i++) {
-      RefPtr<gfx::VRDisplayClient> display = updatedDisplays[i];
-      bool isNewDisplay = true;
-      for (size_t j = 0; j < aDisplays.Length(); j++) {
-        if (aDisplays[j]->GetClient()->GetDisplayInfo() == display->GetDisplayInfo()) {
-          displays.AppendElement(aDisplays[j]);
-          isNewDisplay = false;
-        }
-      }
-
-      if (isNewDisplay) {
-        displays.AppendElement(new VRDisplay(aWindow, display));
-      }
-    }
-  }
-
-  aDisplays = displays;
-}
-
-NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(VRFieldOfView, mParent)
-NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(VRFieldOfView, AddRef)
-NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(VRFieldOfView, Release)
-
-
-JSObject*
-VRFieldOfView::WrapObject(JSContext* aCx,
-                          JS::Handle<JSObject*> aGivenProto)
-{
-  return VRFieldOfViewBinding::Wrap(aCx, this, aGivenProto);
-}
-
-NS_IMPL_CYCLE_COLLECTION_CLASS(VREyeParameters)
-
-NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(VREyeParameters)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent, mFOV)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
-  tmp->mOffset = nullptr;
-NS_IMPL_CYCLE_COLLECTION_UNLINK_END
-
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(VREyeParameters)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent, mFOV)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
-
-NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(VREyeParameters)
-  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
-  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mOffset)
-NS_IMPL_CYCLE_COLLECTION_TRACE_END
-
-NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(VREyeParameters, AddRef)
-NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(VREyeParameters, Release)
-
-VREyeParameters::VREyeParameters(nsISupports* aParent,
-                                 const gfx::Point3D& aEyeTranslation,
-                                 const gfx::VRFieldOfView& aFOV,
-                                 const gfx::IntSize& aRenderSize)
-  : mParent(aParent)
-  , mEyeTranslation(aEyeTranslation)
-  , mRenderSize(aRenderSize)
-{
-  mFOV = new VRFieldOfView(aParent, aFOV);
-  mozilla::HoldJSObjects(this);
-}
-
-VREyeParameters::~VREyeParameters()
-{
-  mozilla::DropJSObjects(this);
-}
-
-VRFieldOfView*
-VREyeParameters::FieldOfView()
-{
-  return mFOV;
-}
-
-void
-VREyeParameters::GetOffset(JSContext* aCx, JS::MutableHandle<JSObject*> aRetval, ErrorResult& aRv)
-{
-  if (!mOffset) {
-    // Lazily create the Float32Array
-    mOffset = dom::Float32Array::Create(aCx, this, 3, mEyeTranslation.components);
-    if (!mOffset) {
-      aRv.NoteJSContextException(aCx);
-      return;
-    }
-  }
-  aRetval.set(mOffset);
-}
-
-JSObject*
-VREyeParameters::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
-{
-  return VREyeParametersBinding::Wrap(aCx, this, aGivenProto);
-}
-
-VRStageParameters::VRStageParameters(nsISupports* aParent,
-                                     const gfx::Matrix4x4& aSittingToStandingTransform,
-                                     const gfx::Size& aSize)
-  : mParent(aParent)
-  , mSittingToStandingTransform(aSittingToStandingTransform)
-  , mSittingToStandingTransformArray(nullptr)
-  , mSize(aSize)
-{
-  mozilla::HoldJSObjects(this);
-}
-
-VRStageParameters::~VRStageParameters()
-{
-  mozilla::DropJSObjects(this);
-}
-
-JSObject*
-VRStageParameters::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
-{
-  return VRStageParametersBinding::Wrap(aCx, this, aGivenProto);
-}
-
-NS_IMPL_CYCLE_COLLECTION_CLASS(VRStageParameters)
-
-NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(VRStageParameters)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
-  tmp->mSittingToStandingTransformArray = nullptr;
-NS_IMPL_CYCLE_COLLECTION_UNLINK_END
-
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(VRStageParameters)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
-
-NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(VRStageParameters)
-  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
-  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mSittingToStandingTransformArray)
-NS_IMPL_CYCLE_COLLECTION_TRACE_END
-
-NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(VRStageParameters, AddRef)
-NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(VRStageParameters, Release)
-
-void
-VRStageParameters::GetSittingToStandingTransform(JSContext* aCx,
-                                                 JS::MutableHandle<JSObject*> aRetval,
-                                                 ErrorResult& aRv)
-{
-  if (!mSittingToStandingTransformArray) {
-    // Lazily create the Float32Array
-    mSittingToStandingTransformArray = dom::Float32Array::Create(aCx, this, 16,
-      mSittingToStandingTransform.components);
-    if (!mSittingToStandingTransformArray) {
-      aRv.NoteJSContextException(aCx);
-      return;
-    }
-  }
-  aRetval.set(mSittingToStandingTransformArray);
-}
-
-NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(VRDisplayCapabilities, mParent)
-NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(VRDisplayCapabilities, AddRef)
-NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(VRDisplayCapabilities, Release)
-
-JSObject*
-VRDisplayCapabilities::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
-{
-  return VRDisplayCapabilitiesBinding::Wrap(aCx, this, aGivenProto);
-}
-
-VRPose::VRPose(nsISupports* aParent, const gfx::VRHMDSensorState& aState)
-  : Pose(aParent)
-  , mVRState(aState)
-{
-  mFrameId = aState.inputFrameID;
-  mozilla::HoldJSObjects(this);
-}
-
-VRPose::VRPose(nsISupports* aParent)
-  : Pose(aParent)
-{
-  mFrameId = 0;
-  mVRState.Clear();
-  mozilla::HoldJSObjects(this);
-}
-
-VRPose::~VRPose()
-{
-  mozilla::DropJSObjects(this);
-}
-
-void
-VRPose::GetPosition(JSContext* aCx,
-                    JS::MutableHandle<JSObject*> aRetval,
-                    ErrorResult& aRv)
-{
-  SetFloat32Array(aCx, aRetval, mPosition, mVRState.position, 3,
-    !mPosition && bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Position),
-    aRv);
-}
-
-void
-VRPose::GetLinearVelocity(JSContext* aCx,
-                          JS::MutableHandle<JSObject*> aRetval,
-                          ErrorResult& aRv)
-{
-  SetFloat32Array(aCx, aRetval, mLinearVelocity, mVRState.linearVelocity, 3,
-    !mLinearVelocity && bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Position),
-    aRv);
-}
-
-void
-VRPose::GetLinearAcceleration(JSContext* aCx,
-                              JS::MutableHandle<JSObject*> aRetval,
-                              ErrorResult& aRv)
-{
-  SetFloat32Array(aCx, aRetval, mLinearAcceleration, mVRState.linearAcceleration, 3,
-    !mLinearAcceleration && bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_LinearAcceleration),
-    aRv);
-
-}
-
-void
-VRPose::GetOrientation(JSContext* aCx,
-                       JS::MutableHandle<JSObject*> aRetval,
-                       ErrorResult& aRv)
-{
-  SetFloat32Array(aCx, aRetval, mOrientation, mVRState.orientation, 4,
-    !mOrientation && bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Orientation),
-    aRv);
-}
-
-void
-VRPose::GetAngularVelocity(JSContext* aCx,
-                           JS::MutableHandle<JSObject*> aRetval,
-                           ErrorResult& aRv)
-{
-  SetFloat32Array(aCx, aRetval, mAngularVelocity, mVRState.angularVelocity, 3,
-    !mAngularVelocity && bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Orientation),
-    aRv);
-}
-
-void
-VRPose::GetAngularAcceleration(JSContext* aCx,
-                               JS::MutableHandle<JSObject*> aRetval,
-                               ErrorResult& aRv)
-{
-  SetFloat32Array(aCx, aRetval, mAngularAcceleration, mVRState.angularAcceleration, 3,
-    !mAngularAcceleration && bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_AngularAcceleration),
-    aRv);
-}
-
-JSObject*
-VRPose::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
-{
-  return VRPoseBinding::Wrap(aCx, this, aGivenProto);
-}
-
-/* virtual */ JSObject*
-VRDisplay::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
-{
-  return VRDisplayBinding::Wrap(aCx, this, aGivenProto);
-}
-
-VRDisplay::VRDisplay(nsPIDOMWindowInner* aWindow, gfx::VRDisplayClient* aClient)
-  : DOMEventTargetHelper(aWindow)
-  , mClient(aClient)
-  , mDepthNear(0.01f) // Default value from WebVR Spec
-  , mDepthFar(10000.0f) // Default value from WebVR Spec
-{
-  const gfx::VRDisplayInfo& info = aClient->GetDisplayInfo();
-  mDisplayId = info.GetDisplayID();
-  mDisplayName = NS_ConvertASCIItoUTF16(info.GetDisplayName());
-  mCapabilities = new VRDisplayCapabilities(aWindow, info.GetCapabilities());
-  if (info.GetCapabilities() & gfx::VRDisplayCapabilityFlags::Cap_StageParameters) {
-    mStageParameters = new VRStageParameters(aWindow,
-                                             info.GetSittingToStandingTransform(),
-                                             info.GetStageSize());
-  }
-  mozilla::HoldJSObjects(this);
-}
-
-VRDisplay::~VRDisplay()
-{
-  ExitPresentInternal();
-  mozilla::DropJSObjects(this);
-}
-
-void
-VRDisplay::LastRelease()
-{
-  // We don't want to wait for the CC to free up the presentation
-  // for use in other documents, so we do this in LastRelease().
-  ExitPresentInternal();
-}
-
-already_AddRefed<VREyeParameters>
-VRDisplay::GetEyeParameters(VREye aEye)
-{
-  gfx::VRDisplayInfo::Eye eye = aEye == VREye::Left ? gfx::VRDisplayInfo::Eye_Left : gfx::VRDisplayInfo::Eye_Right;
-  RefPtr<VREyeParameters> params =
-    new VREyeParameters(GetParentObject(),
-                        mClient->GetDisplayInfo().GetEyeTranslation(eye),
-                        mClient->GetDisplayInfo().GetEyeFOV(eye),
-                        mClient->GetDisplayInfo().SuggestedEyeResolution());
-  return params.forget();
-}
-
-VRDisplayCapabilities*
-VRDisplay::Capabilities()
-{
-  return mCapabilities;
-}
-
-VRStageParameters*
-VRDisplay::GetStageParameters()
-{
-  return mStageParameters;
-}
-
-void
-VRDisplay::UpdateFrameInfo()
-{
-  /**
-   * The WebVR 1.1 spec Requires that VRDisplay.getPose and VRDisplay.getFrameData
-   * must return the same values until the next VRDisplay.submitFrame.
-   *
-   * mFrameInfo is marked dirty at the end of the frame or start of a new
-   * composition and lazily created here in order to receive mid-frame
-   * pose-prediction updates while still ensuring conformance to the WebVR spec
-   * requirements.
-   *
-   * If we are not presenting WebVR content, the frame will never end and we should
-   * return the latest frame data always.
-   */
-  if (mFrameInfo.IsDirty() || !mPresentation) {
-    gfx::VRHMDSensorState state = mClient->GetSensorState();
-    const gfx::VRDisplayInfo& info = mClient->GetDisplayInfo();
-    mFrameInfo.Update(info, state, mDepthNear, mDepthFar);
-  }
-}
-
-bool
-VRDisplay::GetFrameData(VRFrameData& aFrameData)
-{
-  UpdateFrameInfo();
-  aFrameData.Update(mFrameInfo);
-  return true;
-}
-
-already_AddRefed<VRPose>
-VRDisplay::GetPose()
-{
-  UpdateFrameInfo();
-  RefPtr<VRPose> obj = new VRPose(GetParentObject(), mFrameInfo.mVRState);
-
-  return obj.forget();
-}
-
-void
-VRDisplay::ResetPose()
-{
-  mClient->ZeroSensor();
-}
-
-already_AddRefed<Promise>
-VRDisplay::RequestPresent(const nsTArray<VRLayer>& aLayers, ErrorResult& aRv)
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
-  if (!global) {
-    aRv.Throw(NS_ERROR_FAILURE);
-    return nullptr;
-  }
-
-  RefPtr<Promise> promise = Promise::Create(global, aRv);
-  NS_ENSURE_TRUE(!aRv.Failed(), nullptr);
-
-  nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
-  NS_ENSURE_TRUE(obs, nullptr);
-
-  if (mClient->GetIsPresenting()) {
-    // Only one presentation allowed per VRDisplay
-    // on a first-come-first-serve basis.
-    promise->MaybeRejectWithUndefined();
-  } else {
-    mPresentation = mClient->BeginPresentation(aLayers);
-    mFrameInfo.Clear();
-
-    nsresult rv = obs->AddObserver(this, "inner-window-destroyed", false);
-    if (NS_WARN_IF(NS_FAILED(rv))) {
-      mPresentation = nullptr;
-      promise->MaybeRejectWithUndefined();
-    } else {
-      promise->MaybeResolve(JS::UndefinedHandleValue);
-    }
-  }
-  return promise.forget();
-}
-
-NS_IMETHODIMP
-VRDisplay::Observe(nsISupports* aSubject, const char* aTopic,
-  const char16_t* aData)
-{
-  MOZ_ASSERT(NS_IsMainThread());
-
-  if (strcmp(aTopic, "inner-window-destroyed") == 0) {
-    nsCOMPtr<nsISupportsPRUint64> wrapper = do_QueryInterface(aSubject);
-    NS_ENSURE_TRUE(wrapper, NS_ERROR_FAILURE);
-
-    uint64_t innerID;
-    nsresult rv = wrapper->GetData(&innerID);
-    NS_ENSURE_SUCCESS(rv, rv);
-
-    if (!GetOwner() || GetOwner()->WindowID() == innerID) {
-      ExitPresentInternal();
-    }
-
-    return NS_OK;
-  }
-
-  // This should not happen.
-  return NS_ERROR_FAILURE;
-}
-
-already_AddRefed<Promise>
-VRDisplay::ExitPresent(ErrorResult& aRv)
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
-  if (!global) {
-    aRv.Throw(NS_ERROR_FAILURE);
-    return nullptr;
-  }
-
-
-  RefPtr<Promise> promise = Promise::Create(global, aRv);
-  NS_ENSURE_TRUE(!aRv.Failed(), nullptr);
-
-  if (!IsPresenting()) {
-    // We can not exit a presentation outside of the context that
-    // started the presentation.
-    promise->MaybeRejectWithUndefined();
-  } else {
-    promise->MaybeResolve(JS::UndefinedHandleValue);
-    ExitPresentInternal();
-  }
-
-  return promise.forget();
-}
-
-void
-VRDisplay::ExitPresentInternal()
-{
-  mPresentation = nullptr;
-}
-
-void
-VRDisplay::GetLayers(nsTArray<VRLayer>& result)
-{
-  if (mPresentation) {
-    mPresentation->GetDOMLayers(result);
-  } else {
-    result = nsTArray<VRLayer>();
-  }
-}
-
-void
-VRDisplay::SubmitFrame()
-{
-  if (mPresentation) {
-    mPresentation->SubmitFrame();
-  }
-  mFrameInfo.Clear();
-}
-
-int32_t
-VRDisplay::RequestAnimationFrame(FrameRequestCallback& aCallback,
-ErrorResult& aError)
-{
-  gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
-
-  int32_t handle;
-  aError = vm->ScheduleFrameRequestCallback(aCallback, &handle);
-  return handle;
-}
-
-void
-VRDisplay::CancelAnimationFrame(int32_t aHandle, ErrorResult& aError)
-{
-  gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
-  vm->CancelFrameRequestCallback(aHandle);
-}
-
-
-bool
-VRDisplay::IsPresenting() const
-{
-  // IsPresenting returns true only if this Javascript context is presenting
-  // and will return false if another context is presenting.
-  return mPresentation != nullptr;
-}
-
-bool
-VRDisplay::IsConnected() const
-{
-  return mClient->GetIsConnected();
-}
-
-NS_IMPL_CYCLE_COLLECTION_INHERITED(VRDisplay, DOMEventTargetHelper, mCapabilities, mStageParameters)
-
-NS_IMPL_ADDREF_INHERITED(VRDisplay, DOMEventTargetHelper)
-NS_IMPL_RELEASE_INHERITED(VRDisplay, DOMEventTargetHelper)
-
-NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(VRDisplay)
-NS_INTERFACE_MAP_ENTRY(nsIObserver)
-NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, DOMEventTargetHelper)
-NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
-
-NS_IMPL_CYCLE_COLLECTION_CLASS(VRFrameData)
-
-NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(VRFrameData)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent, mPose)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
-  tmp->mLeftProjectionMatrix = nullptr;
-  tmp->mLeftViewMatrix = nullptr;
-  tmp->mRightProjectionMatrix = nullptr;
-  tmp->mRightViewMatrix = nullptr;
-NS_IMPL_CYCLE_COLLECTION_UNLINK_END
-
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(VRFrameData)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent, mPose)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
-
-NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(VRFrameData)
-  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
-  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mLeftProjectionMatrix)
-  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mLeftViewMatrix)
-  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mRightProjectionMatrix)
-  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mRightViewMatrix)
-NS_IMPL_CYCLE_COLLECTION_TRACE_END
-
-NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(VRFrameData, AddRef)
-NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(VRFrameData, Release)
-
-VRFrameData::VRFrameData(nsISupports* aParent)
-  : mParent(aParent)
-  , mLeftProjectionMatrix(nullptr)
-  , mLeftViewMatrix(nullptr)
-  , mRightProjectionMatrix(nullptr)
-  , mRightViewMatrix(nullptr)
-{
-  mozilla::HoldJSObjects(this);
-  mPose = new VRPose(aParent);
-}
-
-VRFrameData::~VRFrameData()
-{
-  mozilla::DropJSObjects(this);
-}
-
-/* static */ already_AddRefed<VRFrameData>
-VRFrameData::Constructor(const GlobalObject& aGlobal, ErrorResult& aRv)
-{
-  RefPtr<VRFrameData> obj = new VRFrameData(aGlobal.GetAsSupports());
-  return obj.forget();
-}
-
-JSObject*
-VRFrameData::WrapObject(JSContext* aCx,
-                        JS::Handle<JSObject*> aGivenProto)
-{
-  return VRFrameDataBinding::Wrap(aCx, this, aGivenProto);
-}
-
-VRPose*
-VRFrameData::Pose()
-{
-  return mPose;
-}
-
-void
-VRFrameData::LazyCreateMatrix(JS::Heap<JSObject*>& aArray, gfx::Matrix4x4& aMat, JSContext* aCx,
-                              JS::MutableHandle<JSObject*> aRetval, ErrorResult& aRv)
-{
-  if (!aArray) {
-    // Lazily create the Float32Array
-    aArray = dom::Float32Array::Create(aCx, this, 16, aMat.components);
-    if (!aArray) {
-      aRv.NoteJSContextException(aCx);
-      return;
-    }
-  }
-  if (aArray) {
-    JS::ExposeObjectToActiveJS(aArray);
-  }
-  aRetval.set(aArray);
-}
-
-double
-VRFrameData::Timestamp() const
-{
-  // Converting from seconds to milliseconds
-  return mFrameInfo.mVRState.timestamp * 1000.0f;
-}
-
-void
-VRFrameData::GetLeftProjectionMatrix(JSContext* aCx,
-                                     JS::MutableHandle<JSObject*> aRetval,
-                                     ErrorResult& aRv)
-{
-  LazyCreateMatrix(mLeftProjectionMatrix, mFrameInfo.mLeftProjection, aCx,
-                   aRetval, aRv);
-}
-
-void
-VRFrameData::GetLeftViewMatrix(JSContext* aCx,
-                               JS::MutableHandle<JSObject*> aRetval,
-                               ErrorResult& aRv)
-{
-  LazyCreateMatrix(mLeftViewMatrix, mFrameInfo.mLeftView, aCx, aRetval, aRv);
-}
-
-void
-VRFrameData::GetRightProjectionMatrix(JSContext* aCx,
-                                      JS::MutableHandle<JSObject*> aRetval,
-                                      ErrorResult& aRv)
-{
-  LazyCreateMatrix(mRightProjectionMatrix, mFrameInfo.mRightProjection, aCx,
-                   aRetval, aRv);
-}
-
-void
-VRFrameData::GetRightViewMatrix(JSContext* aCx,
-                                JS::MutableHandle<JSObject*> aRetval,
-                                ErrorResult& aRv)
-{
-  LazyCreateMatrix(mRightViewMatrix, mFrameInfo.mRightView, aCx, aRetval, aRv);
-}
-
-void
-VRFrameData::Update(const VRFrameInfo& aFrameInfo)
-{
-  mFrameInfo = aFrameInfo;
-
-  mLeftProjectionMatrix = nullptr;
-  mLeftViewMatrix = nullptr;
-  mRightProjectionMatrix = nullptr;
-  mRightViewMatrix = nullptr;
-
-  mPose = new VRPose(GetParentObject(), mFrameInfo.mVRState);
-}
-
-void
-VRFrameInfo::Update(const gfx::VRDisplayInfo& aInfo,
-                    const gfx::VRHMDSensorState& aState,
-                    float aDepthNear,
-                    float aDepthFar)
-{
-  mVRState = aState;
-
-  gfx::Quaternion qt;
-  if (mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Orientation) {
-    qt.x = mVRState.orientation[0];
-    qt.y = mVRState.orientation[1];
-    qt.z = mVRState.orientation[2];
-    qt.w = mVRState.orientation[3];
-  }
-  gfx::Point3D pos;
-  if (mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Position) {
-    pos.x = -mVRState.position[0];
-    pos.y = -mVRState.position[1];
-    pos.z = -mVRState.position[2];
-  }
-  gfx::Matrix4x4 matHead;
-  matHead.SetRotationFromQuaternion(qt);
-  matHead.PreTranslate(pos);
-
-  mLeftView = matHead;
-  mLeftView.PostTranslate(-aInfo.mEyeTranslation[gfx::VRDisplayInfo::Eye_Left]);
-
-  mRightView = matHead;
-  mRightView.PostTranslate(-aInfo.mEyeTranslation[gfx::VRDisplayInfo::Eye_Right]);
-
-  // Avoid division by zero within ConstructProjectionMatrix
-  const float kEpsilon = 0.00001f;
-  if (fabs(aDepthFar - aDepthNear) < kEpsilon) {
-    aDepthFar = aDepthNear + kEpsilon;
-  }
-
-  const gfx::VRFieldOfView leftFOV = aInfo.mEyeFOV[gfx::VRDisplayInfo::Eye_Left];
-  mLeftProjection = leftFOV.ConstructProjectionMatrix(aDepthNear, aDepthFar, true);
-  const gfx::VRFieldOfView rightFOV = aInfo.mEyeFOV[gfx::VRDisplayInfo::Eye_Right];
-  mRightProjection = rightFOV.ConstructProjectionMatrix(aDepthNear, aDepthFar, true);
-}
-
-VRFrameInfo::VRFrameInfo()
-{
-  mVRState.Clear();
-}
-
-bool
-VRFrameInfo::IsDirty()
-{
-  return mVRState.timestamp == 0;
-}
-
-void
-VRFrameInfo::Clear()
-{
-  mVRState.Clear();
-}
-
-} // namespace dom
-} // namespace mozilla
diff --git a/dom/vr/VRDisplay.h b/dom/vr/VRDisplay.h
deleted file mode 100644
index d40d3d8ac..000000000
--- a/dom/vr/VRDisplay.h
+++ /dev/null
@@ -1,362 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef mozilla_dom_VRDisplay_h_
-#define mozilla_dom_VRDisplay_h_
-
-#include <stdint.h>
-
-#include "mozilla/ErrorResult.h"
-#include "mozilla/dom/TypedArray.h"
-#include "mozilla/dom/VRDisplayBinding.h"
-#include "mozilla/DOMEventTargetHelper.h"
-#include "mozilla/dom/DOMPoint.h"
-#include "mozilla/dom/DOMRect.h"
-#include "mozilla/dom/Pose.h"
-
-#include "nsCOMPtr.h"
-#include "nsString.h"
-#include "nsTArray.h"
-
-#include "gfxVR.h"
-
-namespace mozilla {
-namespace gfx {
-class VRDisplayClient;
-class VRDisplayPresentation;
-struct VRFieldOfView;
-enum class VRDisplayCapabilityFlags : uint16_t;
-struct VRHMDSensorState;
-}
-namespace dom {
-class Navigator;
-
-class VRFieldOfView final : public nsWrapperCache
-{
-public:
-  VRFieldOfView(nsISupports* aParent,
-                double aUpDegrees, double aRightDegrees,
-                double aDownDegrees, double aLeftDegrees);
-  VRFieldOfView(nsISupports* aParent, const gfx::VRFieldOfView& aSrc);
-
-  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(VRFieldOfView)
-  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(VRFieldOfView)
-
-  double UpDegrees() const { return mUpDegrees; }
-  double RightDegrees() const { return mRightDegrees; }
-  double DownDegrees() const { return mDownDegrees; }
-  double LeftDegrees() const { return mLeftDegrees; }
-
-  nsISupports* GetParentObject() const { return mParent; }
-  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
-
-protected:
-  virtual ~VRFieldOfView() {}
-
-  nsCOMPtr<nsISupports> mParent;
-
-  double mUpDegrees;
-  double mRightDegrees;
-  double mDownDegrees;
-  double mLeftDegrees;
-};
-
-class VRDisplayCapabilities final : public nsWrapperCache
-{
-public:
-  VRDisplayCapabilities(nsISupports* aParent, const gfx::VRDisplayCapabilityFlags& aFlags)
-    : mParent(aParent)
-    , mFlags(aFlags)
-  {
-  }
-
-  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(VRDisplayCapabilities)
-  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(VRDisplayCapabilities)
-
-  nsISupports* GetParentObject() const
-  {
-    return mParent;
-  }
-
-  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
-
-  bool HasPosition() const;
-  bool HasOrientation() const;
-  bool HasExternalDisplay() const;
-  bool CanPresent() const;
-  uint32_t MaxLayers() const;
-
-protected:
-  ~VRDisplayCapabilities() {}
-  nsCOMPtr<nsISupports> mParent;
-  gfx::VRDisplayCapabilityFlags mFlags;
-};
-
-class VRPose final : public Pose
-{
-
-public:
-  VRPose(nsISupports* aParent, const gfx::VRHMDSensorState& aState);
-  explicit VRPose(nsISupports* aParent);
-
-  uint32_t FrameID() const { return mFrameId; }
-
-  virtual void GetPosition(JSContext* aCx,
-                           JS::MutableHandle<JSObject*> aRetval,
-                           ErrorResult& aRv) override;
-  virtual void GetLinearVelocity(JSContext* aCx,
-                                 JS::MutableHandle<JSObject*> aRetval,
-                                 ErrorResult& aRv) override;
-  virtual void GetLinearAcceleration(JSContext* aCx,
-                                     JS::MutableHandle<JSObject*> aRetval,
-                                     ErrorResult& aRv) override;
-  virtual void GetOrientation(JSContext* aCx,
-                              JS::MutableHandle<JSObject*> aRetval,
-                              ErrorResult& aRv) override;
-  virtual void GetAngularVelocity(JSContext* aCx,
-                                  JS::MutableHandle<JSObject*> aRetval,
-                                  ErrorResult& aRv) override;
-  virtual void GetAngularAcceleration(JSContext* aCx,
-                                      JS::MutableHandle<JSObject*> aRetval,
-                                      ErrorResult& aRv) override;
-
-  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
-
-protected:
-  ~VRPose();
-
-  uint32_t mFrameId;
-  gfx::VRHMDSensorState mVRState;
-};
-
-struct VRFrameInfo
-{
-  VRFrameInfo();
-
-  void Update(const gfx::VRDisplayInfo& aInfo,
-              const gfx::VRHMDSensorState& aState,
-              float aDepthNear,
-              float aDepthFar);
-
-  void Clear();
-  bool IsDirty();
-
-  gfx::VRHMDSensorState mVRState;
-  gfx::Matrix4x4 mLeftProjection;
-  gfx::Matrix4x4 mLeftView;
-  gfx::Matrix4x4 mRightProjection;
-  gfx::Matrix4x4 mRightView;
-
-};
-
-class VRFrameData final : public nsWrapperCache
-{
-public:
-  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(VRFrameData)
-  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(VRFrameData)
-
-  explicit VRFrameData(nsISupports* aParent);
-  static already_AddRefed<VRFrameData> Constructor(const GlobalObject& aGlobal,
-                                                   ErrorResult& aRv);
-
-  void Update(const VRFrameInfo& aFrameInfo);
-
-  // WebIDL Members
-  double Timestamp() const;
-  void GetLeftProjectionMatrix(JSContext* aCx,
-                               JS::MutableHandle<JSObject*> aRetval,
-                               ErrorResult& aRv);
-  void GetLeftViewMatrix(JSContext* aCx,
-                         JS::MutableHandle<JSObject*> aRetval,
-                         ErrorResult& aRv);
-  void GetRightProjectionMatrix(JSContext* aCx,
-                               JS::MutableHandle<JSObject*> aRetval,
-                               ErrorResult& aRv);
-  void GetRightViewMatrix(JSContext* aCx,
-                          JS::MutableHandle<JSObject*> aRetval,
-                          ErrorResult& aRv);
-
-  VRPose* Pose();
-
-  // WebIDL Boilerplate
-  nsISupports* GetParentObject() const { return mParent; }
-  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
-
-protected:
-  ~VRFrameData();
-  nsCOMPtr<nsISupports> mParent;
-
-  VRFrameInfo mFrameInfo;
-  RefPtr<VRPose> mPose;
-  JS::Heap<JSObject*> mLeftProjectionMatrix;
-  JS::Heap<JSObject*> mLeftViewMatrix;
-  JS::Heap<JSObject*> mRightProjectionMatrix;
-  JS::Heap<JSObject*> mRightViewMatrix;
-
-  void LazyCreateMatrix(JS::Heap<JSObject*>& aArray, gfx::Matrix4x4& aMat,
-                        JSContext* aCx, JS::MutableHandle<JSObject*> aRetval,
-                        ErrorResult& aRv);
-};
-
-class VRStageParameters final : public nsWrapperCache
-{
-public:
-  VRStageParameters(nsISupports* aParent,
-                    const gfx::Matrix4x4& aSittingToStandingTransform,
-                    const gfx::Size& aSize);
-
-  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(VRStageParameters)
-  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(VRStageParameters)
-
-  void GetSittingToStandingTransform(JSContext* aCx,
-                                     JS::MutableHandle<JSObject*> aRetval,
-                                     ErrorResult& aRv);
-  float SizeX() const { return mSize.width; }
-  float SizeZ() const { return mSize.height; }
-
-  nsISupports* GetParentObject() const { return mParent; }
-  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
-
-protected:
-  ~VRStageParameters();
-
-  nsCOMPtr<nsISupports> mParent;
-
-  gfx::Matrix4x4 mSittingToStandingTransform;
-  JS::Heap<JSObject*> mSittingToStandingTransformArray;
-  gfx::Size mSize;
-};
-
-class VREyeParameters final : public nsWrapperCache
-{
-public:
-  VREyeParameters(nsISupports* aParent,
-                  const gfx::Point3D& aEyeTranslation,
-                  const gfx::VRFieldOfView& aFOV,
-                  const gfx::IntSize& aRenderSize);
-
-  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(VREyeParameters)
-  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(VREyeParameters)
-
-  void GetOffset(JSContext* aCx, JS::MutableHandle<JSObject*> aRetVal,
-                 ErrorResult& aRv);
-
-  VRFieldOfView* FieldOfView();
-
-  uint32_t RenderWidth() const { return mRenderSize.width; }
-  uint32_t RenderHeight() const { return mRenderSize.height; }
-
-  nsISupports* GetParentObject() const { return mParent; }
-  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
-protected:
-  ~VREyeParameters();
-
-  nsCOMPtr<nsISupports> mParent;
-
-
-  gfx::Point3D mEyeTranslation;
-  gfx::IntSize mRenderSize;
-  JS::Heap<JSObject*> mOffset;
-  RefPtr<VRFieldOfView> mFOV;
-};
-
-class VRDisplay final : public DOMEventTargetHelper
-                      , public nsIObserver
-{
-public:
-  NS_DECL_ISUPPORTS_INHERITED
-  NS_DECL_NSIOBSERVER
-  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(VRDisplay, DOMEventTargetHelper)
-
-  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
-
-  bool IsPresenting() const;
-  bool IsConnected() const;
-
-  VRDisplayCapabilities* Capabilities();
-  VRStageParameters* GetStageParameters();
-
-  uint32_t DisplayId() const { return mDisplayId; }
-  void GetDisplayName(nsAString& aDisplayName) const { aDisplayName = mDisplayName; }
-
-  static bool RefreshVRDisplays(uint64_t aWindowId);
-  static void UpdateVRDisplays(nsTArray<RefPtr<VRDisplay> >& aDisplays,
-                               nsPIDOMWindowInner* aWindow);
-
-  gfx::VRDisplayClient *GetClient() {
-    return mClient;
-  }
-
-  virtual already_AddRefed<VREyeParameters> GetEyeParameters(VREye aEye);
-
-  bool GetFrameData(VRFrameData& aFrameData);
-  already_AddRefed<VRPose> GetPose();
-  void ResetPose();
-
-  double DepthNear() {
-    return mDepthNear;
-  }
-
-  double DepthFar() {
-    return mDepthFar;
-  }
-
-  void SetDepthNear(double aDepthNear) {
-    // XXX When we start sending depth buffers to VRLayer's we will want
-    // to communicate this with the VRDisplayHost
-    mDepthNear = aDepthNear;
-  }
-
-  void SetDepthFar(double aDepthFar) {
-    // XXX When we start sending depth buffers to VRLayer's we will want
-    // to communicate this with the VRDisplayHost
-    mDepthFar = aDepthFar;
-  }
-
-  already_AddRefed<Promise> RequestPresent(const nsTArray<VRLayer>& aLayers, ErrorResult& aRv);
-  already_AddRefed<Promise> ExitPresent(ErrorResult& aRv);
-  void GetLayers(nsTArray<VRLayer>& result);
-  void SubmitFrame();
-
-  int32_t RequestAnimationFrame(mozilla::dom::FrameRequestCallback& aCallback,
-                                mozilla::ErrorResult& aError);
-  void CancelAnimationFrame(int32_t aHandle, mozilla::ErrorResult& aError);
-
-protected:
-  VRDisplay(nsPIDOMWindowInner* aWindow, gfx::VRDisplayClient* aClient);
-  virtual ~VRDisplay();
-  virtual void LastRelease() override;
-
-  void ExitPresentInternal();
-  void UpdateFrameInfo();
-
-  RefPtr<gfx::VRDisplayClient> mClient;
-
-  uint32_t mDisplayId;
-  nsString mDisplayName;
-
-  RefPtr<VRDisplayCapabilities> mCapabilities;
-  RefPtr<VRStageParameters> mStageParameters;
-
-  double mDepthNear;
-  double mDepthFar;
-
-  RefPtr<gfx::VRDisplayPresentation> mPresentation;
-
-  /**
-  * The WebVR 1.1 spec Requires that VRDisplay.getPose and VRDisplay.getFrameData
-  * must return the same values until the next VRDisplay.submitFrame.
-  * mFrameInfo is updated only on the first call to either function within one
-  * frame.  Subsequent calls before the next SubmitFrame or ExitPresent call
-  * will use these cached values.
-  */
-  VRFrameInfo mFrameInfo;
-};
-
-} // namespace dom
-} // namespace mozilla
-
-#endif
diff --git a/dom/vr/VREventObserver.cpp b/dom/vr/VREventObserver.cpp
deleted file mode 100644
index 1b6d1b978..000000000
--- a/dom/vr/VREventObserver.cpp
+++ /dev/null
@@ -1,79 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
-* License, v. 2.0. If a copy of the MPL was not distributed with this
-* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "VREventObserver.h"
-
-#include "nsContentUtils.h"
-#include "nsGlobalWindow.h"
-#include "VRManagerChild.h"
-
-namespace mozilla {
-namespace dom {
-
-using namespace gfx;
-
-/**
- * This class is used by nsGlobalWindow to implement window.onvrdisplayconnected,
- * window.onvrdisplaydisconnected, and window.onvrdisplaypresentchange.
- */
-VREventObserver::VREventObserver(nsGlobalWindow* aGlobalWindow)
-  : mWindow(aGlobalWindow)
-{
-  MOZ_ASSERT(aGlobalWindow && aGlobalWindow->IsInnerWindow());
-
-  VRManagerChild* vmc = VRManagerChild::Get();
-  if (vmc) {
-    vmc->AddListener(this);
-  }
-}
-
-VREventObserver::~VREventObserver()
-{
-  VRManagerChild* vmc = VRManagerChild::Get();
-  if (vmc) {
-    vmc->RemoveListener(this);
-  }
-}
-
-void
-VREventObserver::NotifyVRDisplayConnect()
-{
-  /**
-   * We do not call nsGlobalWindow::NotifyActiveVRDisplaysChanged here, as we
-   * can assume that a newly enumerated display is not presenting WebVR
-   * content.
-   */
-  if (mWindow->AsInner()->IsCurrentInnerWindow()) {
-    MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
-    mWindow->GetOuterWindow()->DispatchCustomEvent(
-      NS_LITERAL_STRING("vrdisplayconnected"));
-  }
-}
-
-void
-VREventObserver::NotifyVRDisplayDisconnect()
-{
-  if (mWindow->AsInner()->IsCurrentInnerWindow()) {
-    mWindow->NotifyActiveVRDisplaysChanged();
-    MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
-    mWindow->GetOuterWindow()->DispatchCustomEvent(
-      NS_LITERAL_STRING("vrdisplaydisconnected"));
-  }
-}
-
-void
-VREventObserver::NotifyVRDisplayPresentChange()
-{
-  if (mWindow->AsInner()->IsCurrentInnerWindow()) {
-    mWindow->NotifyActiveVRDisplaysChanged();
-    MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
-    mWindow->GetOuterWindow()->DispatchCustomEvent(
-      NS_LITERAL_STRING("vrdisplaypresentchange"));
-  }
-}
-
-} // namespace dom
-} // namespace mozilla
diff --git a/dom/vr/VREventObserver.h b/dom/vr/VREventObserver.h
deleted file mode 100644
index a30bb5960..000000000
--- a/dom/vr/VREventObserver.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
-* License, v. 2.0. If a copy of the MPL was not distributed with this file,
-* You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef mozilla_dom_VREventObserver_h
-#define mozilla_dom_VREventObserver_h
-
-class nsGlobalWindow;
-
-namespace mozilla {
-namespace dom {
-
-class VREventObserver final
-{
-public:
-  ~VREventObserver();
-  explicit VREventObserver(nsGlobalWindow* aGlobalWindow);
-
-  void NotifyVRDisplayConnect();
-  void NotifyVRDisplayDisconnect();
-  void NotifyVRDisplayPresentChange();
-
-private:
-  // Weak pointer, instance is owned by mWindow.
-  nsGlobalWindow* MOZ_NON_OWNING_REF mWindow;
-};
-
-} // namespace dom
-} // namespace mozilla
-
-#endif // mozilla_dom_VREventObserver_h
diff --git a/dom/vr/moz.build b/dom/vr/moz.build
deleted file mode 100644
index a4aa8d69b..000000000
--- a/dom/vr/moz.build
+++ /dev/null
@@ -1,22 +0,0 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-EXPORTS.mozilla.dom += [
-    'VRDisplay.h',
-    'VREventObserver.h',
-    ]
-
-UNIFIED_SOURCES = [
-    'VRDisplay.cpp',
-    'VREventObserver.cpp',
-    ]
-
-include('/ipc/chromium/chromium-config.mozbuild')
-
-FINAL_LIBRARY = 'xul'
-LOCAL_INCLUDES += [
-    '/dom/base'
-]
diff --git a/dom/webidl/AddonEvent.webidl b/dom/webidl/AddonEvent.webidl
deleted file mode 100644
index 235f81ec2..000000000
--- a/dom/webidl/AddonEvent.webidl
+++ /dev/null
@@ -1,12 +0,0 @@
-[ Func="mozilla::AddonManagerWebAPI::IsAPIEnabled",
-  Constructor(DOMString type, AddonEventInit eventInitDict)]
-interface AddonEvent : Event {
-  readonly attribute DOMString id;
-  readonly attribute boolean needsRestart;
-};
-
-dictionary AddonEventInit : EventInit {
-  required DOMString id;
-  required boolean needsRestart;
-};
-
diff --git a/dom/webidl/AddonManager.webidl b/dom/webidl/AddonManager.webidl
deleted file mode 100644
index 02c7953e6..000000000
--- a/dom/webidl/AddonManager.webidl
+++ /dev/null
@@ -1,91 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/.
- */
-
-/* We need a JSImplementation but cannot get one without a contract ID.
-   Since Addon and AddonInstall are only ever created from JS they don't need
-   real contract IDs. */
-[ChromeOnly, JSImplementation="dummy"]
-interface Addon {
-  // The add-on's ID.
-  readonly attribute DOMString id;
-  // The add-on's version.
-  readonly attribute DOMString version;
-  // The add-on's type (extension, theme, etc.).
-  readonly attribute DOMString type;
-  // The add-on's name in the current locale.
-  readonly attribute DOMString name;
-  // The add-on's description in the current locale.
-  readonly attribute DOMString description;
-  // If the user has enabled this add-on, note that it still may not be running
-  // depending on whether enabling requires a restart or if the add-on is
-  // incompatible in some way.
-  readonly attribute boolean isEnabled;
-  // If the add-on is currently active in the browser.
-  readonly attribute boolean isActive;
-  // If the add-on may be uninstalled
-  readonly attribute boolean canUninstall;
-
-  Promise<boolean> uninstall();
-  Promise<void> setEnabled(boolean value);
-};
-
-[ChromeOnly, JSImplementation="dummy"]
-interface AddonInstall : EventTarget {
-  // One of the STATE_* symbols from AddonManager.jsm
-  readonly attribute DOMString state;
-  // One of the ERROR_* symbols from AddonManager.jsm, or null
-  readonly attribute DOMString? error;
-  // How many bytes have been downloaded
-  readonly attribute long long progress;
-  // How many total bytes will need to be downloaded or -1 if unknown
-  readonly attribute long long maxProgress;
-
-  Promise<void> install();
-  Promise<void> cancel();
-};
-
-dictionary addonInstallOptions {
-  required DOMString url;
-  // If a non-empty string is passed for "hash", it is used to verify the
-  // checksum of the downloaded XPI before installing.  If is omitted or if
-  // it is null or empty string, no checksum verification is performed.
-  DOMString? hash = null;
-};
-
-[HeaderFile="mozilla/AddonManagerWebAPI.h",
- Func="mozilla::AddonManagerWebAPI::IsAPIEnabled",
- NavigatorProperty="mozAddonManager",
- JSImplementation="@mozilla.org/addon-web-api/manager;1"]
-interface AddonManager : EventTarget {
-  /**
-   * Gets information about an add-on
-   *
-   * @param  id
-   *         The ID of the add-on to test for.
-   * @return A promise. It will resolve to an Addon if the add-on is installed.
-   */
-  Promise<Addon> getAddonByID(DOMString id);
-
-  /**
-   * Creates an AddonInstall object for a given URL.
-   *
-   * @param options
-   *        Only one supported option: 'url', the URL of the addon to install.
-   * @return A promise that resolves to an instance of AddonInstall.
-   */
-  Promise<AddonInstall> createInstall(optional addonInstallOptions options);
-
-  /* Hooks for managing event listeners */
-  [ChromeOnly]
-  void eventListenerWasAdded(DOMString type);
-  [ChromeOnly]
-  void eventListenerWasRemoved(DOMString type);
-};
-
-[ChromeOnly,Exposed=System,HeaderFile="mozilla/AddonManagerWebAPI.h"]
-interface AddonManagerPermissions {
-  static boolean isHostPermitted(DOMString host);
-};
-
diff --git a/dom/webidl/AudioContext.webidl b/dom/webidl/AudioContext.webidl
index c2f65abaf..9aa3d5567 100644
--- a/dom/webidl/AudioContext.webidl
+++ b/dom/webidl/AudioContext.webidl
@@ -24,7 +24,6 @@ dictionary PeriodicWaveConstraints {
 };
 
 [Constructor,
- Constructor(AudioChannel audioChannelType),
  Pref="dom.webaudio.enabled"]
 interface AudioContext : EventTarget {
 
diff --git a/dom/webidl/CommandEvent.webidl b/dom/webidl/CommandEvent.webidl
index 8c16e856c..9856c77c3 100644
--- a/dom/webidl/CommandEvent.webidl
+++ b/dom/webidl/CommandEvent.webidl
@@ -8,7 +8,7 @@ interface CommandEvent : Event {
   readonly attribute DOMString? command;
 
   void initCommandEvent(DOMString type,
-                        boolean canBubble,
-                        boolean cancelable,
-                        DOMString? command);
+                        optional boolean canBubble = false,
+                        optional boolean cancelable = false,
+                        optional DOMString? command = null);
 };
diff --git a/dom/webidl/CompositionEvent.webidl b/dom/webidl/CompositionEvent.webidl
index c293683ce..e4a54d678 100644
--- a/dom/webidl/CompositionEvent.webidl
+++ b/dom/webidl/CompositionEvent.webidl
@@ -25,9 +25,9 @@ interface CompositionEvent : UIEvent
 partial interface CompositionEvent
 {
   void initCompositionEvent(DOMString typeArg,
-                            boolean canBubbleArg,
-                            boolean cancelableArg,
-                            Window? viewArg,
-                            DOMString? dataArg,
-                            DOMString localeArg);
+                            optional boolean canBubbleArg = false,
+                            optional boolean cancelableArg = false,
+                            optional Window? viewArg = null,
+                            optional DOMString? dataArg = null,
+                            optional DOMString localeArg = "");
 };
diff --git a/dom/webidl/CustomEvent.webidl b/dom/webidl/CustomEvent.webidl
index 299a41ec0..1ea5572b7 100644
--- a/dom/webidl/CustomEvent.webidl
+++ b/dom/webidl/CustomEvent.webidl
@@ -19,9 +19,9 @@ interface CustomEvent : Event
   // initCustomEvent is a Gecko specific deprecated method.
   [Throws]
   void initCustomEvent(DOMString type,
-                       boolean canBubble,
-                       boolean cancelable,
-                       any detail);
+                       optional boolean canBubble = false,
+                       optional boolean cancelable = false,
+                       optional any detail = null);
 };
 
 dictionary CustomEventInit : EventInit
diff --git a/dom/webidl/DeviceMotionEvent.webidl b/dom/webidl/DeviceMotionEvent.webidl
index fa4ecf3ca..c26ab080c 100644
--- a/dom/webidl/DeviceMotionEvent.webidl
+++ b/dom/webidl/DeviceMotionEvent.webidl
@@ -48,10 +48,10 @@ dictionary DeviceMotionEventInit : EventInit {
 // Mozilla extensions.
 partial interface DeviceMotionEvent {
   void initDeviceMotionEvent(DOMString type,
-                             boolean canBubble,
-                             boolean cancelable,
-                             DeviceAccelerationInit acceleration,
-                             DeviceAccelerationInit accelerationIncludingGravity,
-                             DeviceRotationRateInit rotationRate,
-                             double? interval);
+                             optional boolean canBubble = false,
+                             optional boolean cancelable = false,
+                             optional DeviceAccelerationInit acceleration,
+                             optional DeviceAccelerationInit accelerationIncludingGravity,
+                             optional DeviceRotationRateInit rotationRate,
+                             optional double? interval = null);
 };
diff --git a/dom/webidl/DeviceOrientationEvent.webidl b/dom/webidl/DeviceOrientationEvent.webidl
index 46194453e..9802b3681 100644
--- a/dom/webidl/DeviceOrientationEvent.webidl
+++ b/dom/webidl/DeviceOrientationEvent.webidl
@@ -14,12 +14,12 @@ interface DeviceOrientationEvent : Event
 
   // initDeviceOrientationEvent is a Gecko specific deprecated method.
   void initDeviceOrientationEvent(DOMString type,
-                                  boolean canBubble,
-                                  boolean cancelable,
-                                  double? alpha,
-                                  double? beta,
-                                  double? gamma,
-                                  boolean absolute);
+                                  optional boolean canBubble = false,
+                                  optional boolean cancelable = false,
+                                  optional double? alpha = null,
+                                  optional double? beta = null,
+                                  optional double? gamma = null,
+                                  optional boolean absolute = false);
 };
 
 dictionary DeviceOrientationEventInit : EventInit
diff --git a/dom/webidl/DragEvent.webidl b/dom/webidl/DragEvent.webidl
index 2cc173d5c..806177790 100644
--- a/dom/webidl/DragEvent.webidl
+++ b/dom/webidl/DragEvent.webidl
@@ -10,21 +10,21 @@ interface DragEvent : MouseEvent
   readonly attribute DataTransfer? dataTransfer;
 
   void initDragEvent(DOMString type,
-                     boolean canBubble,
-                     boolean cancelable,
-                     Window? aView,
-                     long aDetail,
-                     long aScreenX,
-                     long aScreenY,
-                     long aClientX,
-                     long aClientY,
-                     boolean aCtrlKey,
-                     boolean aAltKey,
-                     boolean aShiftKey,
-                     boolean aMetaKey,
-                     unsigned short aButton,
-                     EventTarget? aRelatedTarget,
-                     DataTransfer? aDataTransfer);
+                     optional boolean canBubble = false,
+                     optional boolean cancelable = false,
+                     optional Window? aView = null,
+                     optional long aDetail = 0,
+                     optional long aScreenX = 0,
+                     optional long aScreenY = 0,
+                     optional long aClientX = 0,
+                     optional long aClientY = 0,
+                     optional boolean aCtrlKey = false,
+                     optional boolean aAltKey = false,
+                     optional boolean aShiftKey = false,
+                     optional boolean aMetaKey = false,
+                     optional unsigned short aButton = 0,
+                     optional EventTarget? aRelatedTarget = null,
+                     optional DataTransfer? aDataTransfer = null);
 };
 
 dictionary DragEventInit : MouseEventInit
diff --git a/dom/webidl/Element.webidl b/dom/webidl/Element.webidl
index 97eb4ffe0..cf17523a5 100644
--- a/dom/webidl/Element.webidl
+++ b/dom/webidl/Element.webidl
@@ -164,9 +164,10 @@ interface Element : Node {
 };
 
 // http://dev.w3.org/csswg/cssom-view/
-enum ScrollLogicalPosition { "start", "end" };
+enum ScrollLogicalPosition { "start", "center", "end", "nearest" };
 dictionary ScrollIntoViewOptions : ScrollOptions {
   ScrollLogicalPosition block = "start";
+  ScrollLogicalPosition inline = "nearest";
 };
 
 // http://dev.w3.org/csswg/cssom-view/#extensions-to-the-element-interface
@@ -175,8 +176,7 @@ partial interface Element {
   DOMRect getBoundingClientRect();
 
   // scrolling
-  void scrollIntoView(boolean top);
-  void scrollIntoView(optional ScrollIntoViewOptions options);
+  void scrollIntoView(optional (boolean or ScrollIntoViewOptions) arg);
   // None of the CSSOM attributes are [Pure], because they flush
            attribute long scrollTop;   // scroll on setting
            attribute long scrollLeft;  // scroll on setting
diff --git a/dom/webidl/Event.webidl b/dom/webidl/Event.webidl
index 70a0ef513..a5d7da7d4 100644
--- a/dom/webidl/Event.webidl
+++ b/dom/webidl/Event.webidl
@@ -51,7 +51,9 @@ interface Event {
   [Pure]
   readonly attribute DOMHighResTimeStamp timeStamp;
 
-  void initEvent(DOMString type, boolean bubbles, boolean cancelable);
+  void initEvent(DOMString type,
+                 optional boolean bubbles = false,
+                 optional boolean cancelable = false);
   attribute boolean cancelBubble;
 };
 
diff --git a/dom/webidl/HashChangeEvent.webidl b/dom/webidl/HashChangeEvent.webidl
index 735e8eb28..6e8be455c 100644
--- a/dom/webidl/HashChangeEvent.webidl
+++ b/dom/webidl/HashChangeEvent.webidl
@@ -11,10 +11,10 @@ interface HashChangeEvent : Event
   readonly attribute DOMString newURL;
 
   void initHashChangeEvent(DOMString typeArg,
-                           boolean canBubbleArg,
-                           boolean cancelableArg,
-                           DOMString oldURLArg,
-                           DOMString newURLArg);
+                           optional boolean canBubbleArg = false,
+                           optional boolean cancelableArg = false,
+                           optional DOMString oldURLArg = "",
+                           optional DOMString newURLArg = "");
 };
 
 dictionary HashChangeEventInit : EventInit
diff --git a/dom/webidl/Headers.webidl b/dom/webidl/Headers.webidl
index 205ab9f9e..eef552a7f 100644
--- a/dom/webidl/Headers.webidl
+++ b/dom/webidl/Headers.webidl
@@ -8,7 +8,7 @@
  * http://fetch.spec.whatwg.org/#headers-class
  */
 
-typedef (Headers or sequence<sequence<ByteString>> or MozMap<ByteString>) HeadersInit;
+typedef (Headers or sequence<sequence<ByteString>> or record<ByteString, ByteString>) HeadersInit;
 
 enum HeadersGuardEnum {
   "none",
diff --git a/dom/webidl/InstallTrigger.webidl b/dom/webidl/InstallTrigger.webidl
index 789fb2bc4..68f48ddc6 100644
--- a/dom/webidl/InstallTrigger.webidl
+++ b/dom/webidl/InstallTrigger.webidl
@@ -57,7 +57,7 @@ interface InstallTriggerImpl {
    *         A callback to call as each installation succeeds or fails
    * @return true if the installations were successfully started
    */
-  boolean install(MozMap<(DOMString or InstallTriggerData)> installs,
+  boolean install(record<DOMString, (DOMString or InstallTriggerData)> installs,
                   optional InstallTriggerCallback callback);
 
   /**
diff --git a/dom/webidl/IntersectionObserver.webidl b/dom/webidl/IntersectionObserver.webidl
index dbe8f428d..83200d950 100644
--- a/dom/webidl/IntersectionObserver.webidl
+++ b/dom/webidl/IntersectionObserver.webidl
@@ -7,7 +7,7 @@
  * https://wicg.github.io/IntersectionObserver/
  */
 
-[ProbablyShortLivingObject, Pref="dom.IntersectionObserver.enabled"]
+[ProbablyShortLivingObject, Pref="dom.intersectionObserver.enabled"]
 interface IntersectionObserverEntry {
   [Constant]
   readonly attribute DOMHighResTimeStamp time;
@@ -18,6 +18,8 @@ interface IntersectionObserverEntry {
   [Constant]
   readonly attribute DOMRectReadOnly intersectionRect;
   [Constant]
+  readonly attribute boolean isIntersecting;
+  [Constant]
   readonly attribute double intersectionRatio;
   [Constant]
   readonly attribute Element target;
@@ -25,7 +27,7 @@ interface IntersectionObserverEntry {
 
 [Constructor(IntersectionCallback intersectionCallback,
              optional IntersectionObserverInit options),
- Pref="dom.IntersectionObserver.enabled"]
+ Pref="dom.intersectionObserver.enabled"]
 interface IntersectionObserver {
   [Constant]
   readonly attribute Element? root;
diff --git a/dom/webidl/KeyEvent.webidl b/dom/webidl/KeyEvent.webidl
index 516632854..abb4b6a34 100644
--- a/dom/webidl/KeyEvent.webidl
+++ b/dom/webidl/KeyEvent.webidl
@@ -225,13 +225,13 @@ interface KeyEvent
   const unsigned long DOM_VK_WIN_OEM_CLEAR  = 0xFE;
 
   void initKeyEvent(DOMString type,
-                    boolean canBubble,
-                    boolean cancelable,
-                    Window? view,
-                    boolean ctrlKey,
-                    boolean altKey,
-                    boolean shiftKey,
-                    boolean metaKey,
-                    unsigned long keyCode,
-                    unsigned long charCode);
+                    optional boolean canBubble = false,
+                    optional boolean cancelable = false,
+                    optional Window? view = null,
+                    optional boolean ctrlKey = false,
+                    optional boolean altKey = false,
+                    optional boolean shiftKey = false,
+                    optional boolean metaKey = false,
+                    optional unsigned long keyCode = 0,
+                    optional unsigned long charCode = 0);
 };
diff --git a/dom/webidl/MessageEvent.webidl b/dom/webidl/MessageEvent.webidl
index 548f14520..be5022d67 100644
--- a/dom/webidl/MessageEvent.webidl
+++ b/dom/webidl/MessageEvent.webidl
@@ -43,10 +43,14 @@ interface MessageEvent : Event {
   [Pure, Cached, Frozen]
   readonly attribute sequence<MessagePort> ports;
 
-  void initMessageEvent(DOMString type, boolean bubbles, boolean cancelable,
-                        any data, DOMString origin, DOMString lastEventId,
-                        (WindowProxy or MessagePort)? source,
-                        sequence<MessagePort> ports);
+  void initMessageEvent(DOMString type,
+                        optional boolean bubbles = false,
+                        optional boolean cancelable = false,
+                        optional any data = null, 
+                        optional DOMString origin = "", 
+                        optional DOMString lastEventId = "",
+                        optional (WindowProxy or MessagePort)? source = null,
+                        optional sequence<MessagePort> ports = []);
 };
 
 dictionary MessageEventInit : EventInit {
diff --git a/dom/webidl/MouseEvent.webidl b/dom/webidl/MouseEvent.webidl
index d21354801..192519d57 100644
--- a/dom/webidl/MouseEvent.webidl
+++ b/dom/webidl/MouseEvent.webidl
@@ -32,21 +32,21 @@ interface MouseEvent : UIEvent {
   readonly attribute long           movementY;
 
   // Deprecated in DOM Level 3:
-  void                              initMouseEvent(DOMString typeArg, 
-                                                   boolean canBubbleArg, 
-                                                   boolean cancelableArg, 
-                                                   Window? viewArg,
-                                                   long detailArg, 
-                                                   long screenXArg, 
-                                                   long screenYArg, 
-                                                   long clientXArg, 
-                                                   long clientYArg, 
-                                                   boolean ctrlKeyArg, 
-                                                   boolean altKeyArg, 
-                                                   boolean shiftKeyArg, 
-                                                   boolean metaKeyArg, 
-                                                   short buttonArg,
-                                                   EventTarget? relatedTargetArg);
+void initMouseEvent(DOMString typeArg,
+                    optional boolean canBubbleArg = false,
+                    optional boolean cancelableArg = false,
+                    optional Window? viewArg = null,
+                    optional long detailArg = 0,
+                    optional long screenXArg = 0,
+                    optional long screenYArg = 0,
+                    optional long clientXArg = 0,
+                    optional long clientYArg = 0,
+                    optional boolean ctrlKeyArg = false,
+                    optional boolean altKeyArg = false,
+                    optional boolean shiftKeyArg = false,
+                    optional boolean metaKeyArg = false,
+                    optional short buttonArg = 0,
+                    optional EventTarget? relatedTargetArg = null);
   // Introduced in DOM Level 3:
   boolean                           getModifierState(DOMString keyArg);
 };
@@ -90,23 +90,23 @@ partial interface MouseEvent
 
   readonly attribute unsigned short mozInputSource;
 
-  void                initNSMouseEvent(DOMString typeArg,
-                                       boolean canBubbleArg,
-                                       boolean cancelableArg,
-                                       Window? viewArg,
-                                       long detailArg,
-                                       long screenXArg,
-                                       long screenYArg,
-                                       long clientXArg,
-                                       long clientYArg,
-                                       boolean ctrlKeyArg,
-                                       boolean altKeyArg,
-                                       boolean shiftKeyArg,
-                                       boolean metaKeyArg,
-                                       short buttonArg,
-                                       EventTarget? relatedTargetArg,
-                                       float pressure,
-                                       unsigned short inputSourceArg);
+  void initNSMouseEvent(DOMString typeArg,
+                        optional boolean canBubbleArg = false,
+                        optional boolean cancelableArg = false,
+                        optional Window? viewArg = null,
+                        optional long detailArg = 0,
+                        optional long screenXArg = 0,
+                        optional long screenYArg = 0,
+                        optional long clientXArg = 0,
+                        optional long clientYArg = 0,
+                        optional boolean ctrlKeyArg = false,
+                        optional boolean altKeyArg = false,
+                        optional boolean shiftKeyArg = false,
+                        optional boolean metaKeyArg = false,
+                        optional short buttonArg = 0,
+                        optional EventTarget? relatedTargetArg = null,
+                        optional float pressure = 0,
+                        optional unsigned short inputSourceArg = 0);
   [ChromeOnly]
   readonly attribute boolean hitCluster; // True when touch occurs in a cluster of links
 
diff --git a/dom/webidl/MouseScrollEvent.webidl b/dom/webidl/MouseScrollEvent.webidl
index aa9e30fd2..c1e52bd8c 100644
--- a/dom/webidl/MouseScrollEvent.webidl
+++ b/dom/webidl/MouseScrollEvent.webidl
@@ -12,19 +12,19 @@ interface MouseScrollEvent : MouseEvent
   readonly attribute long axis;
 
   void initMouseScrollEvent(DOMString type,
-                            boolean canBubble,
-                            boolean cancelable,
-                            Window? view,
-                            long detail,
-                            long screenX,
-                            long screenY,
-                            long clientX,
-                            long clientY,
-                            boolean ctrlKey,
-                            boolean altKey,
-                            boolean shiftKey,
-                            boolean metaKey,
-                            unsigned short button,
-                            EventTarget? relatedTarget,
-                            long axis);
+                            optional boolean canBubble = false,
+                            optional boolean cancelable = false,
+                            optional Window? view = null,
+                            optional long detail = 0,
+                            optional long screenX = 0,
+                            optional long screenY = 0,
+                            optional long clientX = 0,
+                            optional long clientY = 0,
+                            optional boolean ctrlKey = false,
+                            optional boolean altKey = false,
+                            optional boolean shiftKey = false,
+                            optional boolean metaKey = false,
+                            optional short button = 0,
+                            optional EventTarget? relatedTarget = null,
+                            optional long axis = 0);
 };
diff --git a/dom/webidl/MutationEvent.webidl b/dom/webidl/MutationEvent.webidl
index 43c7b1cd0..53625b4f9 100644
--- a/dom/webidl/MutationEvent.webidl
+++ b/dom/webidl/MutationEvent.webidl
@@ -23,11 +23,11 @@ interface MutationEvent : Event
 
   [Throws]
   void initMutationEvent(DOMString type,
-                         boolean canBubble,
-                         boolean cancelable,
-                         Node? relatedNode,
-                         DOMString prevValue,
-                         DOMString newValue,
-                         DOMString attrName,
-                         unsigned short attrChange);
+                         optional boolean canBubble = false,
+                         optional boolean cancelable = false,
+                         optional Node? relatedNode = null,
+                         optional DOMString prevValue = "",
+                         optional DOMString newValue = "",
+                         optional DOMString attrName = "",
+                         optional unsigned short attrChange = 0);
 };
diff --git a/dom/webidl/Navigator.webidl b/dom/webidl/Navigator.webidl
index 5452f3247..c353e8be7 100644
--- a/dom/webidl/Navigator.webidl
+++ b/dom/webidl/Navigator.webidl
@@ -268,14 +268,6 @@ partial interface Navigator {
 };
 #endif // MOZ_GAMEPAD
 
-partial interface Navigator {
-  [Throws, Pref="dom.vr.enabled"]
-  Promise<sequence<VRDisplay>> getVRDisplays();
-  // TODO: Use FrozenArray once available. (Bug 1236777)
-  [Frozen, Cached, Pure, Pref="dom.vr.enabled"]
-  readonly attribute sequence<VRDisplay> activeVRDisplays;
-};
-
 #ifdef MOZ_TIME_MANAGER
 // nsIDOMMozNavigatorTime
 partial interface Navigator {
diff --git a/dom/webidl/ScrollAreaEvent.webidl b/dom/webidl/ScrollAreaEvent.webidl
index 0f48b4bc8..f24b7c0ad 100644
--- a/dom/webidl/ScrollAreaEvent.webidl
+++ b/dom/webidl/ScrollAreaEvent.webidl
@@ -12,12 +12,12 @@ interface ScrollAreaEvent : UIEvent
   readonly attribute float height;
 
   void initScrollAreaEvent(DOMString type,
-                           boolean canBubble,
-                           boolean cancelable,
-                           Window? view,
-                           long detail,
-                           float x,
-                           float y,
-                           float width,
-                           float height);
+                           optional boolean canBubble = false,
+                           optional boolean cancelable = false,
+                           optional Window? view = null,
+                           optional long detail = 0,
+                           optional float x = 0,
+                           optional float y = 0,
+                           optional float width = 0,
+                           optional float height = 0);
 };
diff --git a/dom/webidl/SimpleGestureEvent.webidl b/dom/webidl/SimpleGestureEvent.webidl
index 0829076dd..76d0d20f6 100644
--- a/dom/webidl/SimpleGestureEvent.webidl
+++ b/dom/webidl/SimpleGestureEvent.webidl
@@ -25,22 +25,22 @@ interface SimpleGestureEvent : MouseEvent
   readonly attribute unsigned long clickCount;
 
   void initSimpleGestureEvent(DOMString typeArg,
-                              boolean canBubbleArg,
-                              boolean cancelableArg,
-                              Window? viewArg,
-                              long detailArg,
-                              long screenXArg,
-                              long screenYArg,
-                              long clientXArg,
-                              long clientYArg,
-                              boolean ctrlKeyArg,
-                              boolean altKeyArg,
-                              boolean shiftKeyArg,
-                              boolean metaKeyArg,
-                              unsigned short buttonArg,
-                              EventTarget? relatedTargetArg,
-                              unsigned long allowedDirectionsArg,
-                              unsigned long directionArg,
-                              double deltaArg,
-                              unsigned long clickCount);
+                              optional boolean canBubbleArg = false,
+                              optional boolean cancelableArg = false,
+                              optional Window? viewArg = null,
+                              optional long detailArg = 0,
+                              optional long screenXArg = 0,
+                              optional long screenYArg = 0,
+                              optional long clientXArg = 0,
+                              optional long clientYArg = 0,
+                              optional boolean ctrlKeyArg = false,
+                              optional boolean altKeyArg = false,
+                              optional boolean shiftKeyArg = false,
+                              optional boolean metaKeyArg = false,
+                              optional short buttonArg = 0,
+                              optional EventTarget? relatedTargetArg = null,
+                              optional unsigned long allowedDirectionsArg = 0,
+                              optional unsigned long directionArg = 0,
+                              optional double deltaArg = 0,
+                              optional unsigned long clickCount = 0);
 };
diff --git a/dom/webidl/StorageEvent.webidl b/dom/webidl/StorageEvent.webidl
index c3e9605eb..e03f8232c 100644
--- a/dom/webidl/StorageEvent.webidl
+++ b/dom/webidl/StorageEvent.webidl
@@ -21,13 +21,13 @@ interface StorageEvent : Event
 
   // Bug 1016053 - This is not spec compliant.
   void initStorageEvent(DOMString type,
-                        boolean canBubble,
-                        boolean cancelable,
-                        DOMString? key,
-                        DOMString? oldValue,
-                        DOMString? newValue,
-                        DOMString? url,
-                        Storage? storageArea);
+                        optional boolean canBubble = false,
+                        optional boolean cancelable = false,
+                        optional DOMString? key = null,
+                        optional DOMString? oldValue = null,
+                        optional DOMString? newValue = null,
+                        optional DOMString? url = null,
+                        optional Storage? storageArea = null);
 };
 
 dictionary StorageEventInit : EventInit
diff --git a/dom/webidl/TestInterfaceJS.webidl b/dom/webidl/TestInterfaceJS.webidl
index 1ca629c39..2cf8d701a 100644
--- a/dom/webidl/TestInterfaceJS.webidl
+++ b/dom/webidl/TestInterfaceJS.webidl
@@ -24,7 +24,7 @@ interface TestInterfaceJS : EventTarget {
   any pingPongObjectOrString((object or DOMString) objOrString);
   TestInterfaceJSDictionary pingPongDictionary(optional TestInterfaceJSDictionary dict);
   long pingPongDictionaryOrLong(optional (TestInterfaceJSUnionableDictionary or long) dictOrLong);
-  DOMString pingPongMap(MozMap<any> map);
+  DOMString pingPongMap(record<DOMString, any> map);
   long objectSequenceLength(sequence<object> seq);
   long anySequenceLength(sequence<any> seq);
 
diff --git a/dom/webidl/TimeEvent.webidl b/dom/webidl/TimeEvent.webidl
index 40e7a0beb..8bbe4db53 100644
--- a/dom/webidl/TimeEvent.webidl
+++ b/dom/webidl/TimeEvent.webidl
@@ -15,6 +15,6 @@ interface TimeEvent : Event
   readonly attribute long         detail;
   readonly attribute WindowProxy? view;
   void initTimeEvent(DOMString aType,
-                     Window? aView,
-                     long aDetail);
+                     optional Window? aView = null,
+                     optional long aDetail = 0);
 };
diff --git a/dom/webidl/TouchEvent.webidl b/dom/webidl/TouchEvent.webidl
index d206fe0fb..fd677787a 100644
--- a/dom/webidl/TouchEvent.webidl
+++ b/dom/webidl/TouchEvent.webidl
@@ -23,15 +23,15 @@ interface TouchEvent : UIEvent {
   readonly attribute boolean shiftKey;
 
   void initTouchEvent(DOMString type,
-                      boolean canBubble,
-                      boolean cancelable,
-                      Window? view,
-                      long detail,
-                      boolean ctrlKey,
-                      boolean altKey,
-                      boolean shiftKey,
-                      boolean metaKey,
-                      TouchList? touches,
-                      TouchList? targetTouches,
-                      TouchList? changedTouches);
+                      optional boolean canBubble = false,
+                      optional boolean cancelable = false,
+                      optional Window? view = null,
+                      optional long detail = 0,
+                      optional boolean ctrlKey = false,
+                      optional boolean altKey = false,
+                      optional boolean shiftKey = false,
+                      optional boolean metaKey = false,
+                      optional TouchList? touches = null,
+                      optional TouchList? targetTouches = null,
+                      optional TouchList? changedTouches = null);
 };
diff --git a/dom/webidl/UIEvent.webidl b/dom/webidl/UIEvent.webidl
index 9cc1d0cdf..5be6a443a 100644
--- a/dom/webidl/UIEvent.webidl
+++ b/dom/webidl/UIEvent.webidl
@@ -16,10 +16,10 @@ interface UIEvent : Event
   readonly attribute WindowProxy? view;
   readonly attribute long         detail;
   void initUIEvent(DOMString aType,
-                   boolean aCanBubble,
-                   boolean aCancelable,
-                   Window? aView,
-                   long aDetail);
+                   optional boolean aCanBubble = false,
+                   optional boolean aCancelable = false,
+                   optional Window? aView = null,
+                   optional long aDetail = 0);
 };
 
 // Additional DOM0 properties.
diff --git a/dom/webidl/URLSearchParams.webidl b/dom/webidl/URLSearchParams.webidl
index 93e846071..b93f4e8b1 100644
--- a/dom/webidl/URLSearchParams.webidl
+++ b/dom/webidl/URLSearchParams.webidl
@@ -13,8 +13,7 @@
  * http://www.openwebfoundation.org/legal/the-owf-1-0-agreements/owfa-1-0.
  */
 
-[Constructor(optional USVString init = ""),
- Constructor(URLSearchParams init),
+[Constructor(optional (sequence<sequence<USVString>> or record<USVString, USVString> or USVString) init = ""),
  Exposed=(Window,Worker,WorkerDebugger,System)]
 interface URLSearchParams {
   void append(USVString name, USVString value);
diff --git a/dom/webidl/VRDisplay.webidl b/dom/webidl/VRDisplay.webidl
deleted file mode 100644
index 63ebd1205..000000000
--- a/dom/webidl/VRDisplay.webidl
+++ /dev/null
@@ -1,286 +0,0 @@
-/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-enum VREye {
-  "left",
-  "right"
-};
-
-[Pref="dom.vr.enabled",
- HeaderFile="mozilla/dom/VRDisplay.h"]
-interface VRFieldOfView {
-  readonly attribute double upDegrees;
-  readonly attribute double rightDegrees;
-  readonly attribute double downDegrees;
-  readonly attribute double leftDegrees;
-};
-
-typedef (HTMLCanvasElement or OffscreenCanvas) VRSource;
-
-dictionary VRLayer {
-  /**
-   * XXX - When WebVR in WebWorkers is implemented, HTMLCanvasElement below
-   *       should be replaced with VRSource.
-   */
-  HTMLCanvasElement? source = null;
-
-  /**
-   * The left and right viewports contain 4 values defining the viewport
-   * rectangles within the canvas to present to the eye in UV space.
-   * [0] left offset of the viewport (0.0 - 1.0)
-   * [1] top offset of the viewport (0.0 - 1.0)
-   * [2] width of the viewport (0.0 - 1.0)
-   * [3] height of the viewport (0.0 - 1.0)
-   *
-   * When no values are passed, they will be processed as though the left
-   * and right sides of the viewport were passed:
-   *
-   * leftBounds: [0.0, 0.0, 0.5, 1.0]
-   * rightBounds: [0.5, 0.0, 0.5, 1.0]
-   */
-  sequence<float> leftBounds = [];
-  sequence<float> rightBounds = [];
-};
-
-/**
- * Values describing the capabilities of a VRDisplay.
- * These are expected to be static per-device/per-user.
- */
-[Pref="dom.vr.enabled",
- HeaderFile="mozilla/dom/VRDisplay.h"]
-interface VRDisplayCapabilities {
-  /**
-   * hasPosition is true if the VRDisplay is capable of tracking its position.
-   */
-  readonly attribute boolean hasPosition;
-
-  /**
-   * hasOrientation is true if the VRDisplay is capable of tracking its orientation.
-   */
-  readonly attribute boolean hasOrientation;
-
-  /**
-   * Whether the VRDisplay is separate from the device’s
-   * primary display. If presenting VR content will obscure
-   * other content on the device, this should be false. When
-   * false, the application should not attempt to mirror VR content
-   * or update non-VR UI because that content will not be visible.
-   */
-  readonly attribute boolean hasExternalDisplay;
-
-  /**
-   * Whether the VRDisplay is capable of presenting content to an HMD or similar device.
-   * Can be used to indicate “magic window” devices that are capable of 6DoF tracking but for
-   * which requestPresent is not meaningful. If false then calls to requestPresent should
-   * always fail, and getEyeParameters should return null.
-   */
-  readonly attribute boolean canPresent;
-
-  /**
-   * Indicates the maximum length of the array that requestPresent() will accept. MUST be 1 if
-     canPresent is true, 0 otherwise.
-   */
-  readonly attribute unsigned long maxLayers;
-};
-
-/**
- * Values describing the the stage / play area for devices
- * that support room-scale experiences.
- */
-[Pref="dom.vr.enabled",
- HeaderFile="mozilla/dom/VRDisplay.h"]
-interface VRStageParameters {
-  /**
-   * A 16-element array containing the components of a column-major 4x4
-   * affine transform matrix. This matrix transforms the sitting-space position
-   * returned by get{Immediate}Pose() to a standing-space position.
-   */
-  [Throws] readonly attribute Float32Array sittingToStandingTransform;
-
-  /**
-   * Dimensions of the play-area bounds. The bounds are defined
-   * as an axis-aligned rectangle on the floor.
-   * The center of the rectangle is at (0,0,0) in standing-space
-   * coordinates.
-   * These bounds are defined for safety purposes.
-   * Content should not require the user to move beyond these
-   * bounds; however, it is possible for the user to ignore
-   * the bounds resulting in position values outside of
-   * this rectangle.
-   */
-  readonly attribute float sizeX;
-  readonly attribute float sizeZ;
-};
-
-[Pref="dom.vr.enabled",
- HeaderFile="mozilla/dom/VRDisplay.h"]
-interface VRPose
-{
-  /**
-   * position, linearVelocity, and linearAcceleration are 3-component vectors.
-   * position is relative to a sitting space. Transforming this point with
-   * VRStageParameters.sittingToStandingTransform converts this to standing space.
-   */
-  [Constant, Throws] readonly attribute Float32Array? position;
-  [Constant, Throws] readonly attribute Float32Array? linearVelocity;
-  [Constant, Throws] readonly attribute Float32Array? linearAcceleration;
-
-  /* orientation is a 4-entry array representing the components of a quaternion. */
-  [Constant, Throws] readonly attribute Float32Array? orientation;
-  /* angularVelocity and angularAcceleration are the components of 3-dimensional vectors. */
-  [Constant, Throws] readonly attribute Float32Array? angularVelocity;
-  [Constant, Throws] readonly attribute Float32Array? angularAcceleration;
-};
-
-[Constructor,
- Pref="dom.vr.enabled",
- HeaderFile="mozilla/dom/VRDisplay.h"]
-interface VRFrameData {
-  readonly attribute DOMHighResTimeStamp timestamp;
-
-  [Throws, Pure] readonly attribute Float32Array leftProjectionMatrix;
-  [Throws, Pure] readonly attribute Float32Array leftViewMatrix;
-
-  [Throws, Pure] readonly attribute Float32Array rightProjectionMatrix;
-  [Throws, Pure] readonly attribute Float32Array rightViewMatrix;
-
-  [Pure] readonly attribute VRPose pose;
-};
-
-[Pref="dom.vr.enabled",
- HeaderFile="mozilla/dom/VRDisplay.h"]
-interface VREyeParameters {
-  /**
-   * offset is a 3-component vector representing an offset to
-   * translate the eye. This value may vary from frame
-   * to frame if the user adjusts their headset ipd.
-   */
-  [Constant, Throws] readonly attribute Float32Array offset;
-
-  /* These values may vary as the user adjusts their headset ipd. */
-  [Constant] readonly attribute VRFieldOfView fieldOfView;
-
-  /**
-   * renderWidth and renderHeight specify the recommended render target
-   * size of each eye viewport, in pixels. If multiple eyes are rendered
-   * in a single render target, then the render target should be made large
-   * enough to fit both viewports.
-   */
-  [Constant] readonly attribute unsigned long renderWidth;
-  [Constant] readonly attribute unsigned long renderHeight;
-};
-
-[Pref="dom.vr.enabled",
- HeaderFile="mozilla/dom/VRDisplay.h"]
-interface VRDisplay : EventTarget {
-  readonly attribute boolean isConnected;
-  readonly attribute boolean isPresenting;
-
-  /**
-   * Dictionary of capabilities describing the VRDisplay.
-   */
-  [Constant] readonly attribute VRDisplayCapabilities capabilities;
-
-  /**
-   * If this VRDisplay supports room-scale experiences, the optional
-   * stage attribute contains details on the room-scale parameters.
-   */
-  readonly attribute VRStageParameters? stageParameters;
-
-  /* Return the current VREyeParameters for the given eye. */
-  VREyeParameters getEyeParameters(VREye whichEye);
-
-  /**
-   * An identifier for this distinct VRDisplay. Used as an
-   * association point in the Gamepad API.
-   */
-  [Constant] readonly attribute unsigned long displayId;
-
-  /**
-   * A display name, a user-readable name identifying it.
-   */
-  [Constant] readonly attribute DOMString displayName;
-
-  /**
-   * Populates the passed VRFrameData with the information required to render
-   * the current frame.
-   */
-  boolean getFrameData(VRFrameData frameData);
-
-  /**
-   * Return a VRPose containing the future predicted pose of the VRDisplay
-   * when the current frame will be presented. Subsequent calls to getPose()
-   * MUST return a VRPose with the same values until the next call to
-   * submitFrame().
-   *
-   * The VRPose will contain the position, orientation, velocity,
-   * and acceleration of each of these properties.
-   */
-  [NewObject] VRPose getPose();
-
-  /**
-   * Reset the pose for this display, treating its current position and
-   * orientation as the "origin/zero" values. VRPose.position,
-   * VRPose.orientation, and VRStageParameters.sittingToStandingTransform may be
-   * updated when calling resetPose(). This should be called in only
-   * sitting-space experiences.
-   */
-  void resetPose();
-
-  /**
-   * z-depth defining the near plane of the eye view frustum
-   * enables mapping of values in the render target depth
-   * attachment to scene coordinates. Initially set to 0.01.
-   */
-  attribute double depthNear;
-
-  /**
-   * z-depth defining the far plane of the eye view frustum
-   * enables mapping of values in the render target depth
-   * attachment to scene coordinates. Initially set to 10000.0.
-   */
-  attribute double depthFar;
-
-  /**
-   * The callback passed to `requestAnimationFrame` will be called
-   * any time a new frame should be rendered. When the VRDisplay is
-   * presenting the callback will be called at the native refresh
-   * rate of the HMD. When not presenting this function acts
-   * identically to how window.requestAnimationFrame acts. Content should
-   * make no assumptions of frame rate or vsync behavior as the HMD runs
-   * asynchronously from other displays and at differing refresh rates.
-   */
-  [Throws] long requestAnimationFrame(FrameRequestCallback callback);
-
-  /**
-   * Passing the value returned by `requestAnimationFrame` to
-   * `cancelAnimationFrame` will unregister the callback.
-   */
-  [Throws] void cancelAnimationFrame(long handle);
-
-  /**
-   * Begin presenting to the VRDisplay. Must be called in response to a user gesture.
-   * Repeat calls while already presenting will update the VRLayers being displayed.
-   */
-  [Throws] Promise<void> requestPresent(sequence<VRLayer> layers);
-
-  /**
-   * Stops presenting to the VRDisplay.
-   */
-  [Throws] Promise<void> exitPresent();
-
-  /**
-   * Get the layers currently being presented.
-   */
-  sequence<VRLayer> getLayers();
-
-  /**
-   * The VRLayer provided to the VRDisplay will be captured and presented
-   * in the HMD. Calling this function has the same effect on the source
-   * canvas as any other operation that uses its source image, and canvases
-   * created without preserveDrawingBuffer set to true will be cleared.
-   */
-  void submitFrame();
-};
diff --git a/dom/webidl/XULCommandEvent.webidl b/dom/webidl/XULCommandEvent.webidl
index 9c024edc1..72dc3802e 100644
--- a/dom/webidl/XULCommandEvent.webidl
+++ b/dom/webidl/XULCommandEvent.webidl
@@ -15,13 +15,13 @@ interface XULCommandEvent : UIEvent
   readonly attribute Event? sourceEvent;
 
   void initCommandEvent(DOMString type,
-                        boolean canBubble,
-                        boolean cancelable,
-                        Window? view,
-                        long detail,
-                        boolean ctrlKey,
-                        boolean altKey,
-                        boolean shiftKey,
-                        boolean metaKey,
-                        Event? sourceEvent);
+                        optional boolean canBubble = false,
+                        optional boolean cancelable = false,
+                        optional Window? view = null,
+                        optional long detail = 0,
+                        optional boolean ctrlKey = false,
+                        optional boolean altKey = false,
+                        optional boolean shiftKey = false,
+                        optional boolean metaKey = false,
+                        optional Event? sourceEvent = null);
 };
diff --git a/dom/webidl/moz.build b/dom/webidl/moz.build
index 4c2567a1c..aae7e479c 100644
--- a/dom/webidl/moz.build
+++ b/dom/webidl/moz.build
@@ -555,7 +555,6 @@ WEBIDL_FILES = [
     'VideoStreamTrack.webidl',
     'VideoTrack.webidl',
     'VideoTrackList.webidl',
-    'VRDisplay.webidl',
     'VTTCue.webidl',
     'VTTRegion.webidl',
     'WaveShaperNode.webidl',
@@ -592,9 +591,6 @@ WEBIDL_FILES = [
     'XULElement.webidl',
 ]
 
-if CONFIG['MOZ_WEBEXTENSIONS']:
-  WEBIDL_FILES += ['AddonManager.webidl']
-
 if CONFIG['MOZ_AUDIO_CHANNEL_MANAGER']:
     WEBIDL_FILES += [
         'AudioChannelManager.webidl',
@@ -723,9 +719,6 @@ GENERATED_EVENTS_WEBIDL_FILES = [
     'WebGLContextEvent.webidl',
 ]
 
-if CONFIG['MOZ_WEBEXTENSIONS']:
-  GENERATED_EVENTS_WEBIDL_FILES += ['AddonEvent.webidl']
-
 if CONFIG['MOZ_WEBRTC']:
     GENERATED_EVENTS_WEBIDL_FILES += [
         'RTCDataChannelEvent.webidl',
diff --git a/dom/workers/RuntimeService.cpp b/dom/workers/RuntimeService.cpp
index e1910536f..21f6d8ddf 100644
--- a/dom/workers/RuntimeService.cpp
+++ b/dom/workers/RuntimeService.cpp
@@ -30,7 +30,6 @@
 #include "mozilla/AsyncEventDispatcher.h"
 #include "mozilla/Atomics.h"
 #include "mozilla/CycleCollectedJSContext.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/TimeStamp.h"
 #include "mozilla/dom/asmjscache/AsmJSCache.h"
 #include "mozilla/dom/AtomList.h"
@@ -1531,10 +1530,8 @@ RuntimeService::RegisterWorker(WorkerPrivate* aWorkerPrivate)
 
   const bool isServiceWorker = aWorkerPrivate->IsServiceWorker();
   const bool isSharedWorker = aWorkerPrivate->IsSharedWorker();
-  const bool isDedicatedWorker = aWorkerPrivate->IsDedicatedWorker();
   if (isServiceWorker) {
     AssertIsOnMainThread();
-    Telemetry::Accumulate(Telemetry::SERVICE_WORKER_SPAWN_ATTEMPTS, 1);
   }
 
   nsCString sharedWorkerScriptSpec;
@@ -1586,14 +1583,6 @@ RuntimeService::RegisterWorker(WorkerPrivate* aWorkerPrivate)
       // Worker spawn gets queued due to hitting max workers per domain
       // limit so let's log a warning.
       WorkerPrivate::ReportErrorToConsole("HittingMaxWorkersPerDomain2");
-
-      if (isServiceWorker) {
-        Telemetry::Accumulate(Telemetry::SERVICE_WORKER_SPAWN_GETS_QUEUED, 1);
-      } else if (isSharedWorker) {
-        Telemetry::Accumulate(Telemetry::SHARED_WORKER_SPAWN_GETS_QUEUED, 1);
-      } else if (isDedicatedWorker) {
-        Telemetry::Accumulate(Telemetry::DEDICATED_WORKER_SPAWN_GETS_QUEUED, 1);
-      }
     }
     else if (parent) {
       domainInfo->mChildWorkerCount++;
@@ -1669,7 +1658,6 @@ RuntimeService::RegisterWorker(WorkerPrivate* aWorkerPrivate)
 
   if (isServiceWorker) {
     AssertIsOnMainThread();
-    Telemetry::Accumulate(Telemetry::SERVICE_WORKER_WAS_SPAWNED, 1);
   }
   return true;
 }
@@ -1766,8 +1754,6 @@ RuntimeService::UnregisterWorker(WorkerPrivate* aWorkerPrivate)
 
   if (aWorkerPrivate->IsServiceWorker()) {
     AssertIsOnMainThread();
-    Telemetry::AccumulateTimeDelta(Telemetry::SERVICE_WORKER_LIFE_TIME,
-                                   aWorkerPrivate->CreationTimeStamp());
   }
 
   if (aWorkerPrivate->IsSharedWorker() ||
diff --git a/dom/workers/ServiceWorkerClient.cpp b/dom/workers/ServiceWorkerClient.cpp
index 660512a5f..6ed3a6ea4 100644
--- a/dom/workers/ServiceWorkerClient.cpp
+++ b/dom/workers/ServiceWorkerClient.cpp
@@ -224,7 +224,7 @@ ServiceWorkerClient::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
     return;
   }
 
-  aRv = workerPrivate->DispatchToMainThread(runnable.forget());
+  aRv = NS_DispatchToMainThread(runnable);
   if (NS_WARN_IF(aRv.Failed())) {
     return;
   }
diff --git a/dom/workers/ServiceWorkerClients.cpp b/dom/workers/ServiceWorkerClients.cpp
index 11f864443..38f49e355 100644
--- a/dom/workers/ServiceWorkerClients.cpp
+++ b/dom/workers/ServiceWorkerClients.cpp
@@ -753,7 +753,7 @@ ServiceWorkerClients::Get(const nsAString& aClientId, ErrorResult& aRv)
 
   RefPtr<GetRunnable> r =
     new GetRunnable(promiseProxy, aClientId);
-  MOZ_ALWAYS_SUCCEEDS(workerPrivate->DispatchToMainThread(r.forget()));
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(r));
   return promise.forget();
 }
 
@@ -789,7 +789,7 @@ ServiceWorkerClients::MatchAll(const ClientQueryOptions& aOptions,
     new MatchAllRunnable(promiseProxy,
                          NS_ConvertUTF16toUTF8(scope),
                          aOptions.mIncludeUncontrolled);
-  MOZ_ALWAYS_SUCCEEDS(workerPrivate->DispatchToMainThread(r.forget()));
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(r));
   return promise.forget();
 }
 
@@ -830,7 +830,7 @@ ServiceWorkerClients::OpenWindow(const nsAString& aUrl,
 
   RefPtr<OpenWindowRunnable> r = new OpenWindowRunnable(promiseProxy,
                                                         aUrl, scope);
-  MOZ_ALWAYS_SUCCEEDS(workerPrivate->DispatchToMainThread(r.forget()));
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(r));
 
   return promise.forget();
 }
@@ -859,6 +859,6 @@ ServiceWorkerClients::Claim(ErrorResult& aRv)
   RefPtr<ClaimRunnable> runnable =
     new ClaimRunnable(promiseProxy, NS_ConvertUTF16toUTF8(scope));
 
-  MOZ_ALWAYS_SUCCEEDS(workerPrivate->DispatchToMainThread(runnable.forget()));
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(runnable));
   return promise.forget();
 }
diff --git a/dom/workers/ServiceWorkerEvents.cpp b/dom/workers/ServiceWorkerEvents.cpp
index 1f79e2c92..8b375c635 100644
--- a/dom/workers/ServiceWorkerEvents.cpp
+++ b/dom/workers/ServiceWorkerEvents.cpp
@@ -400,13 +400,7 @@ void RespondWithCopyComplete(void* aClosure, nsresult aStatus)
                                data->mScriptSpec,
                                data->mResponseURLSpec);
   }
-  // In theory this can happen after the worker thread is terminated.
-  WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
-  if (worker) {
-    MOZ_ALWAYS_SUCCEEDS(worker->DispatchToMainThread(event.forget()));
-  } else {
-    MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(event.forget()));
-  }
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(event));
 }
 
 namespace {
@@ -734,13 +728,7 @@ RespondWithHandler::CancelRequest(nsresult aStatus)
 {
   nsCOMPtr<nsIRunnable> runnable =
     new CancelChannelRunnable(mInterceptedChannel, mRegistration, aStatus);
-  // Note, this may run off the worker thread during worker termination.
-  WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
-  if (worker) {
-    MOZ_ALWAYS_SUCCEEDS(worker->DispatchToMainThread(runnable.forget()));
-  } else {
-    MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(runnable.forget()));
-  }
+  NS_DispatchToMainThread(runnable);
   mRequestWasHandled = true;
 }
 
@@ -873,8 +861,8 @@ public:
       mColumn = column;
     }
 
-    MOZ_ALWAYS_SUCCEEDS(mWorkerPrivate->DispatchToMainThread(
-        NewRunnableMethod(this, &WaitUntilHandler::ReportOnMainThread)));
+    MOZ_ALWAYS_SUCCEEDS(
+      NS_DispatchToMainThread(NewRunnableMethod(this, &WaitUntilHandler::ReportOnMainThread)));
   }
 
   void
diff --git a/dom/workers/ServiceWorkerManager.cpp b/dom/workers/ServiceWorkerManager.cpp
index a66df0731..a8f191f2e 100644
--- a/dom/workers/ServiceWorkerManager.cpp
+++ b/dom/workers/ServiceWorkerManager.cpp
@@ -33,7 +33,6 @@
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/ErrorNames.h"
 #include "mozilla/LoadContext.h"
-#include "mozilla/Telemetry.h"
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/dom/ContentParent.h"
 #include "mozilla/dom/DOMError.h"
@@ -676,7 +675,6 @@ ServiceWorkerManager::Register(mozIDOMWindow* aWindow,
   queue->ScheduleJob(job);
 
   AssertIsOnMainThread();
-  Telemetry::Accumulate(Telemetry::SERVICE_WORKER_REGISTRATIONS, 1);
 
   promise.forget(aPromise);
   return NS_OK;
@@ -2180,7 +2178,6 @@ ServiceWorkerManager::StartControllingADocument(ServiceWorkerRegistrationInfo* a
   if (!aDocumentId.IsEmpty()) {
     aDoc->SetId(aDocumentId);
   }
-  Telemetry::Accumulate(Telemetry::SERVICE_WORKER_CONTROLLED_DOCUMENTS, 1);
 }
 
 void
diff --git a/dom/workers/ServiceWorkerPrivate.cpp b/dom/workers/ServiceWorkerPrivate.cpp
index 24b2e11e6..23ae3b366 100644
--- a/dom/workers/ServiceWorkerPrivate.cpp
+++ b/dom/workers/ServiceWorkerPrivate.cpp
@@ -214,7 +214,7 @@ private:
     mDone = true;
 #endif
     mCallback->SetResult(aResult);
-    MOZ_ALWAYS_SUCCEEDS(mWorkerPrivate->DispatchToMainThread(mCallback));
+    MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(mCallback));
   }
 };
 
@@ -500,7 +500,7 @@ public:
     if (mRegistration) {
       nsCOMPtr<nsIRunnable> runnable =
         new RegistrationUpdateRunnable(mRegistration, true /* time check */);
-      aWorkerPrivate->DispatchToMainThread(runnable.forget());
+      NS_DispatchToMainThread(runnable.forget());
     }
 
     ExtendableEventWorkerRunnable::PostRun(aCx, aWorkerPrivate, aRunResult);
@@ -541,7 +541,7 @@ public:
   Cancel() override
   {
     mCallback->SetResult(false);
-    MOZ_ALWAYS_SUCCEEDS(mWorkerPrivate->DispatchToMainThread(mCallback));
+    MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(mCallback));
 
     return WorkerRunnable::Cancel();
   }
@@ -637,7 +637,7 @@ public:
     mDone = true;
 
     mCallback->SetResult(aResult);
-    nsresult rv = mWorkerPrivate->DispatchToMainThread(mCallback);
+    nsresult rv = NS_DispatchToMainThread(mCallback);
     if (NS_WARN_IF(NS_FAILED(rv))) {
       NS_RUNTIMEABORT("Failed to dispatch life cycle event handler.");
     }
@@ -768,7 +768,6 @@ public:
 
   void Report(uint16_t aReason = nsIPushErrorReporter::DELIVERY_INTERNAL_ERROR)
   {
-    WorkerPrivate* workerPrivate = mWorkerPrivate;
     mWorkerPrivate->AssertIsOnWorkerThread();
     mWorkerPrivate = nullptr;
 
@@ -780,7 +779,7 @@ public:
       NewRunnableMethod<uint16_t>(this,
         &PushErrorReporter::ReportOnMainThread, aReason);
     MOZ_ALWAYS_TRUE(NS_SUCCEEDED(
-      workerPrivate->DispatchToMainThread(runnable.forget())));
+      NS_DispatchToMainThread(runnable.forget())));
   }
 
   void ReportOnMainThread(uint16_t aReason)
@@ -1434,7 +1433,7 @@ public:
   Cancel() override
   {
     nsCOMPtr<nsIRunnable> runnable = new ResumeRequest(mInterceptedChannel);
-    if (NS_FAILED(mWorkerPrivate->DispatchToMainThread(runnable))) {
+    if (NS_FAILED(NS_DispatchToMainThread(runnable))) {
       NS_WARNING("Failed to resume channel on FetchEventRunnable::Cancel()!\n");
     }
     WorkerRunnable::Cancel();
@@ -1554,7 +1553,7 @@ private:
                                              NS_ERROR_INTERCEPTION_FAILED);
       }
 
-      MOZ_ALWAYS_SUCCEEDS(mWorkerPrivate->DispatchToMainThread(runnable.forget()));
+      MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(runnable));
     }
 
     RefPtr<Promise> waitUntilPromise = event->GetPromise();
diff --git a/dom/workers/ServiceWorkerRegistrar.cpp b/dom/workers/ServiceWorkerRegistrar.cpp
index a4757ea54..7df129c2b 100644
--- a/dom/workers/ServiceWorkerRegistrar.cpp
+++ b/dom/workers/ServiceWorkerRegistrar.cpp
@@ -135,9 +135,6 @@ ServiceWorkerRegistrar::GetRegistrations(
 
   if (firstTime) {
     firstTime = false;
-    Telemetry::AccumulateTimeDelta(
-      Telemetry::SERVICE_WORKER_REGISTRATION_LOADING,
-      startTime);
   }
 }
 
diff --git a/dom/workers/ServiceWorkerRegistration.cpp b/dom/workers/ServiceWorkerRegistration.cpp
index 451bd2be9..b3cda2c10 100644
--- a/dom/workers/ServiceWorkerRegistration.cpp
+++ b/dom/workers/ServiceWorkerRegistration.cpp
@@ -1107,7 +1107,7 @@ ServiceWorkerRegistrationWorkerThread::Update(ErrorResult& aRv)
   }
 
   RefPtr<UpdateRunnable> r = new UpdateRunnable(proxy, mScope);
-  MOZ_ALWAYS_SUCCEEDS(worker->DispatchToMainThread(r.forget()));
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(r));
 
   return promise.forget();
 }
@@ -1139,7 +1139,7 @@ ServiceWorkerRegistrationWorkerThread::Unregister(ErrorResult& aRv)
   }
 
   RefPtr<StartUnregisterRunnable> r = new StartUnregisterRunnable(proxy, mScope);
-  MOZ_ALWAYS_SUCCEEDS(worker->DispatchToMainThread(r.forget()));
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(r));
 
   return promise.forget();
 }
@@ -1161,7 +1161,7 @@ ServiceWorkerRegistrationWorkerThread::InitListener()
 
   nsCOMPtr<nsIRunnable> r =
     NewRunnableMethod(mListener, &WorkerListener::StartListeningForEvents);
-  MOZ_ALWAYS_SUCCEEDS(worker->DispatchToMainThread(r.forget()));
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(r));
 }
 
 void
@@ -1183,7 +1183,7 @@ ServiceWorkerRegistrationWorkerThread::ReleaseListener()
 
   nsCOMPtr<nsIRunnable> r =
     NewRunnableMethod(mListener, &WorkerListener::StopListeningForEvents);
-  MOZ_ALWAYS_SUCCEEDS(mWorkerPrivate->DispatchToMainThread(r.forget()));
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(r));
 
   mListener = nullptr;
   mWorkerPrivate = nullptr;
diff --git a/dom/workers/ServiceWorkerUpdateJob.cpp b/dom/workers/ServiceWorkerUpdateJob.cpp
index 614fe4de5..69877dfe4 100644
--- a/dom/workers/ServiceWorkerUpdateJob.cpp
+++ b/dom/workers/ServiceWorkerUpdateJob.cpp
@@ -408,8 +408,6 @@ ServiceWorkerUpdateJob::ComparisonResult(nsresult aStatus,
     return;
   }
 
-  Telemetry::Accumulate(Telemetry::SERVICE_WORKER_UPDATED, 1);
-
   // Begin step 7 of the Update algorithm to evaluate the new script.
 
   RefPtr<ServiceWorkerInfo> sw =
diff --git a/dom/workers/ServiceWorkerWindowClient.cpp b/dom/workers/ServiceWorkerWindowClient.cpp
index 2ce0603cf..bae747214 100644
--- a/dom/workers/ServiceWorkerWindowClient.cpp
+++ b/dom/workers/ServiceWorkerWindowClient.cpp
@@ -183,7 +183,7 @@ ServiceWorkerWindowClient::Focus(ErrorResult& aRv) const
     if (promiseProxy) {
       RefPtr<ClientFocusRunnable> r = new ClientFocusRunnable(mWindowId,
                                                               promiseProxy);
-      MOZ_ALWAYS_SUCCEEDS(workerPrivate->DispatchToMainThread(r.forget()));
+      MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(r));
     } else {
       promise->MaybeReject(NS_ERROR_DOM_ABORT_ERR);
     }
@@ -549,7 +549,7 @@ ServiceWorkerWindowClient::Navigate(const nsAString& aUrl, ErrorResult& aRv)
   if (promiseProxy) {
     RefPtr<ClientNavigateRunnable> r =
       new ClientNavigateRunnable(mWindowId, aUrl, scope, promiseProxy);
-    MOZ_ALWAYS_SUCCEEDS(workerPrivate->DispatchToMainThread(r.forget()));
+    MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(r));
   } else {
     promise->MaybeReject(NS_ERROR_DOM_ABORT_ERR);
   }
diff --git a/dom/workers/SharedWorker.cpp b/dom/workers/SharedWorker.cpp
index b0eed2def..99bb50339 100644
--- a/dom/workers/SharedWorker.cpp
+++ b/dom/workers/SharedWorker.cpp
@@ -12,7 +12,6 @@
 #include "mozilla/Preferences.h"
 #include "mozilla/dom/MessagePort.h"
 #include "mozilla/dom/SharedWorkerBinding.h"
-#include "mozilla/Telemetry.h"
 #include "nsContentUtils.h"
 #include "nsIClassInfoImpl.h"
 #include "nsIDOMEvent.h"
@@ -73,8 +72,6 @@ SharedWorker::Constructor(const GlobalObject& aGlobal, JSContext* aCx,
     return nullptr;
   }
 
-  Telemetry::Accumulate(Telemetry::SHARED_WORKER_COUNT, 1);
-
   return sharedWorker.forget();
 }
 
diff --git a/dom/workers/WorkerPrivate.cpp b/dom/workers/WorkerPrivate.cpp
index 612090027..6bc5c4f96 100644
--- a/dom/workers/WorkerPrivate.cpp
+++ b/dom/workers/WorkerPrivate.cpp
@@ -404,7 +404,7 @@ private:
 
     RefPtr<MainThreadReleaseRunnable> runnable =
       new MainThreadReleaseRunnable(doomed, loadGroupToCancel);
-    if (NS_FAILED(mWorkerPrivate->DispatchToMainThread(runnable.forget()))) {
+    if (NS_FAILED(NS_DispatchToMainThread(runnable))) {
       NS_WARNING("Failed to dispatch, going to leak!");
     }
 
@@ -4078,7 +4078,7 @@ WorkerDebugger::PostMessageToDebugger(const nsAString& aMessage)
 
   RefPtr<PostDebuggerMessageRunnable> runnable =
     new PostDebuggerMessageRunnable(this, aMessage);
-  if (NS_FAILED(mWorkerPrivate->DispatchToMainThread(runnable.forget()))) {
+  if (NS_FAILED(NS_DispatchToMainThread(runnable, NS_DISPATCH_NORMAL))) {
     NS_WARNING("Failed to post message to debugger on main thread!");
   }
 }
@@ -4103,7 +4103,7 @@ WorkerDebugger::ReportErrorToDebugger(const nsAString& aFilename,
 
   RefPtr<ReportDebuggerErrorRunnable> runnable =
     new ReportDebuggerErrorRunnable(this, aFilename, aLineno, aMessage);
-  if (NS_FAILED(mWorkerPrivate->DispatchToMainThread(runnable.forget()))) {
+  if (NS_FAILED(NS_DispatchToMainThread(runnable, NS_DISPATCH_NORMAL))) {
     NS_WARNING("Failed to report error to debugger on main thread!");
   }
 }
@@ -4862,7 +4862,7 @@ WorkerPrivate::MaybeDispatchLoadFailedRunnable()
     return;
   }
 
-  MOZ_ALWAYS_SUCCEEDS(DispatchToMainThread(runnable.forget()));
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(runnable.forget()));
 }
 
 nsIEventTarget*
@@ -5083,7 +5083,7 @@ WorkerPrivate::ScheduleDeletion(WorkerRanOrNot aRanOrNot)
   else {
     RefPtr<TopLevelWorkerFinishedRunnable> runnable =
       new TopLevelWorkerFinishedRunnable(this);
-    if (NS_FAILED(DispatchToMainThread(runnable.forget()))) {
+    if (NS_FAILED(NS_DispatchToMainThread(runnable))) {
       NS_WARNING("Failed to dispatch runnable!");
     }
   }
diff --git a/dom/workers/WorkerRunnable.cpp b/dom/workers/WorkerRunnable.cpp
index 6bbe40f66..60d69d4e4 100644
--- a/dom/workers/WorkerRunnable.cpp
+++ b/dom/workers/WorkerRunnable.cpp
@@ -15,7 +15,6 @@
 #include "mozilla/DebugOnly.h"
 #include "mozilla/ErrorResult.h"
 #include "mozilla/dom/ScriptSettings.h"
-#include "mozilla/Telemetry.h"
 
 #include "js/RootingAPI.h"
 #include "js/Value.h"
@@ -118,7 +117,10 @@ WorkerRunnable::DispatchInternal()
     return NS_SUCCEEDED(parent->Dispatch(runnable.forget()));
   }
 
-  return NS_SUCCEEDED(mWorkerPrivate->DispatchToMainThread(runnable.forget()));
+  nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
+  MOZ_ASSERT(mainThread);
+
+  return NS_SUCCEEDED(mainThread->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL));
 }
 
 void
@@ -554,7 +556,10 @@ WorkerControlRunnable::DispatchInternal()
     return NS_SUCCEEDED(parent->DispatchControlRunnable(runnable.forget()));
   }
 
-  return NS_SUCCEEDED(mWorkerPrivate->DispatchToMainThread(runnable.forget()));
+  nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
+  MOZ_ASSERT(mainThread);
+
+  return NS_SUCCEEDED(mainThread->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL));
 }
 
 NS_IMPL_ISUPPORTS_INHERITED0(WorkerControlRunnable, WorkerRunnable)
@@ -572,8 +577,6 @@ WorkerMainThreadRunnable::Dispatch(Status aFailStatus, ErrorResult& aRv)
 {
   mWorkerPrivate->AssertIsOnWorkerThread();
 
-  TimeStamp startTime = TimeStamp::NowLoRes();
-
   AutoSyncLoopHolder syncLoop(mWorkerPrivate, aFailStatus);
 
   mSyncLoopTarget = syncLoop.GetEventTarget();
@@ -583,18 +586,16 @@ WorkerMainThreadRunnable::Dispatch(Status aFailStatus, ErrorResult& aRv)
     return;
   }
 
-  DebugOnly<nsresult> rv = mWorkerPrivate->DispatchToMainThread(this);
+  RefPtr<WorkerMainThreadRunnable> runnable(this);
+
+  DebugOnly<nsresult> rv =
+    NS_DispatchToMainThread(runnable.forget(), NS_DISPATCH_NORMAL);
   MOZ_ASSERT(NS_SUCCEEDED(rv),
              "Should only fail after xpcom-shutdown-threads and we're gone by then");
 
   if (!syncLoop.Run()) {
     aRv.ThrowUncatchableException();
   }
-
-  Telemetry::Accumulate(Telemetry::SYNC_WORKER_OPERATION, mTelemetryKey,
-                        static_cast<uint32_t>((TimeStamp::NowLoRes() - startTime)
-                                                .ToMilliseconds()));
-  Unused << startTime; // Shut the compiler up.
 }
 
 NS_IMETHODIMP
@@ -678,7 +679,7 @@ WorkerProxyToMainThreadRunnable::Dispatch()
     return false;
   }
 
-  if (NS_WARN_IF(NS_FAILED(mWorkerPrivate->DispatchToMainThread(this)))) {
+  if (NS_WARN_IF(NS_FAILED(NS_DispatchToMainThread(this)))) {
     ReleaseWorker();
     RunBackOnWorkerThread();
     return false;
diff --git a/dom/workers/WorkerScope.cpp b/dom/workers/WorkerScope.cpp
index 54252e53b..ace1a09fc 100644
--- a/dom/workers/WorkerScope.cpp
+++ b/dom/workers/WorkerScope.cpp
@@ -717,7 +717,7 @@ ServiceWorkerGlobalScope::SkipWaiting(ErrorResult& aRv)
     new WorkerScopeSkipWaitingRunnable(promiseProxy,
                                        NS_ConvertUTF16toUTF8(mScope));
 
-  MOZ_ALWAYS_SUCCEEDS(mWorkerPrivate->DispatchToMainThread(runnable.forget()));
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(runnable));
   return promise.forget();
 }
 
diff --git a/dom/worklet/WorkletGlobalScope.cpp b/dom/worklet/WorkletGlobalScope.cpp
index 4caeae81a..8c05a0abe 100644
--- a/dom/worklet/WorkletGlobalScope.cpp
+++ b/dom/worklet/WorkletGlobalScope.cpp
@@ -22,8 +22,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(WorkletGlobalScope)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(WorkletGlobalScope)
-
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWindow)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mConsole)
   tmp->TraverseHostObjectURIs(cb);
diff --git a/dom/xbl/nsXBLBinding.cpp b/dom/xbl/nsXBLBinding.cpp
index d9a2aacc5..b8174f6c2 100644
--- a/dom/xbl/nsXBLBinding.cpp
+++ b/dom/xbl/nsXBLBinding.cpp
@@ -1049,7 +1049,8 @@ nsXBLBinding::DoInitJSClass(JSContext *cx,
   // to create and define it.
   JS::Rooted<JSObject*> proto(cx);
   JS::Rooted<JS::PropertyDescriptor> desc(cx);
-  if (!JS_GetOwnUCPropertyDescriptor(cx, holder, aClassName.get(), &desc)) {
+  if (!JS_GetOwnUCPropertyDescriptor(cx, holder, aClassName.get(),
+                                     aClassName.Length(), &desc)) {
     return NS_ERROR_OUT_OF_MEMORY;
   }
   *aNew = !desc.object();
diff --git a/dom/xbl/nsXBLDocumentInfo.cpp b/dom/xbl/nsXBLDocumentInfo.cpp
index 283775dc6..73b08d7e1 100644
--- a/dom/xbl/nsXBLDocumentInfo.cpp
+++ b/dom/xbl/nsXBLDocumentInfo.cpp
@@ -52,7 +52,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXBLDocumentInfo)
   if (tmp->mDocument &&
       nsCCUncollectableMarker::InGeneration(cb, tmp->mDocument->GetMarkedCCGeneration())) {
-    NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
     return NS_SUCCESS_INTERRUPTED_TRAVERSE;
   }
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
@@ -62,7 +61,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXBLDocumentInfo)
       iter.UserData()->Traverse(cb);
     }
   }
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsXBLDocumentInfo)
   if (tmp->mBindingTable) {
diff --git a/dom/xbl/nsXBLProtoImpl.cpp b/dom/xbl/nsXBLProtoImpl.cpp
index 4db9cabf0..5efcb71e0 100644
--- a/dom/xbl/nsXBLProtoImpl.cpp
+++ b/dom/xbl/nsXBLProtoImpl.cpp
@@ -100,11 +100,15 @@ nsXBLProtoImpl::InstallImplementation(nsXBLPrototypeBinding* aPrototypeBinding,
   // end up with a different content prototype, but we'll already have a property
   // holder called |foo| in the XBL scope. Check for that to avoid wasteful and
   // weird property holder duplication.
-  const char16_t* className = aPrototypeBinding->ClassName().get();
+  const nsString& className = aPrototypeBinding->ClassName();
+  const char16_t* classNameChars = className.get();
+  const size_t classNameLen = className.Length();
+
   JS::Rooted<JSObject*> propertyHolder(cx);
   JS::Rooted<JS::PropertyDescriptor> existingHolder(cx);
   if (scopeObject != globalObject &&
-      !JS_GetOwnUCPropertyDescriptor(cx, scopeObject, className, &existingHolder)) {
+      !JS_GetOwnUCPropertyDescriptor(cx, scopeObject, classNameChars,
+                                     classNameLen, &existingHolder)) {
     return NS_ERROR_FAILURE;
   }
   bool propertyHolderIsNew = !existingHolder.object() || !existingHolder.value().isObject();
@@ -119,8 +123,8 @@ nsXBLProtoImpl::InstallImplementation(nsXBLPrototypeBinding* aPrototypeBinding,
 
     // Define it as a property on the scopeObject, using the same name used on
     // the content side.
-    bool ok = JS_DefineUCProperty(cx, scopeObject, className, -1, propertyHolder,
-                                  JSPROP_PERMANENT | JSPROP_READONLY,
+    bool ok = JS_DefineUCProperty(cx, scopeObject, classNameChars, classNameLen,
+                                  propertyHolder, JSPROP_PERMANENT | JSPROP_READONLY,
                                   JS_STUBGETTER, JS_STUBSETTER);
     NS_ENSURE_TRUE(ok, NS_ERROR_UNEXPECTED);
   } else {
diff --git a/dom/xhr/XMLHttpRequestMainThread.cpp b/dom/xhr/XMLHttpRequestMainThread.cpp
index 4fd34a993..613008ad5 100644
--- a/dom/xhr/XMLHttpRequestMainThread.cpp
+++ b/dom/xhr/XMLHttpRequestMainThread.cpp
@@ -757,15 +757,6 @@ XMLHttpRequestMainThread::SetResponseType(XMLHttpRequestResponseType aResponseTy
     return;
   }
 
-  // We want to get rid of this moz-only types. Bug 1335365.
-  if (aResponseType == XMLHttpRequestResponseType::Moz_blob) {
-    Telemetry::Accumulate(Telemetry::MOZ_BLOB_IN_XHR, 1);
-  } else if (aResponseType == XMLHttpRequestResponseType::Moz_chunked_text) {
-    Telemetry::Accumulate(Telemetry::MOZ_CHUNKED_TEXT_IN_XHR, 1);
-  } else if (aResponseType == XMLHttpRequestResponseType::Moz_chunked_arraybuffer) {
-    Telemetry::Accumulate(Telemetry::MOZ_CHUNKED_ARRAYBUFFER_IN_XHR, 1);
-  }
-
   // Set the responseType attribute's value to the given value.
   mResponseType = aResponseType;
 }
@@ -1521,8 +1512,6 @@ XMLHttpRequestMainThread::Open(const nsACString& aMethod,
     GetOwner()->GetExtantDoc()->WarnOnceAbout(nsIDocument::eSyncXMLHttpRequest);
   }
 
-  Telemetry::Accumulate(Telemetry::XMLHTTPREQUEST_ASYNC_OR_SYNC, aAsync ? 0 : 1);
-
   // Step 1
   nsCOMPtr<nsIDocument> responsibleDocument = GetDocumentIfCurrent();
   if (!responsibleDocument) {
diff --git a/dom/xhr/XMLHttpRequestWorker.cpp b/dom/xhr/XMLHttpRequestWorker.cpp
index c9e892f26..2af61bd7d 100644
--- a/dom/xhr/XMLHttpRequestWorker.cpp
+++ b/dom/xhr/XMLHttpRequestWorker.cpp
@@ -1588,8 +1588,6 @@ XMLHttpRequestWorker::Construct(const GlobalObject& aGlobal,
   WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
   MOZ_ASSERT(workerPrivate);
 
-  Telemetry::Accumulate(Telemetry::XHR_IN_WORKER, 1);
-
   RefPtr<XMLHttpRequestWorker> xhr = new XMLHttpRequestWorker(workerPrivate);
 
   if (workerPrivate->XHRParamsAllowed()) {
diff --git a/dom/xslt/xpath/XPathResult.cpp b/dom/xslt/xpath/XPathResult.cpp
index 33315c942..07121347e 100644
--- a/dom/xslt/xpath/XPathResult.cpp
+++ b/dom/xslt/xpath/XPathResult.cpp
@@ -63,7 +63,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(XPathResult)
     NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(XPathResult)
-    NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
     NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
     NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
     NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mResultNodes)
diff --git a/dom/xslt/xpath/txUnaryExpr.cpp b/dom/xslt/xpath/txUnaryExpr.cpp
index 95682b5b2..ae20fda46 100644
--- a/dom/xslt/xpath/txUnaryExpr.cpp
+++ b/dom/xslt/xpath/txUnaryExpr.cpp
@@ -23,16 +23,7 @@ UnaryExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
     NS_ENSURE_SUCCESS(rv, rv);
 
     double value = exprRes->numberValue();
-#ifdef HPUX
-    /*
-     * Negation of a zero doesn't produce a negative
-     * zero on HPUX. Perform the operation by multiplying with
-     * -1.
-     */
-    return aContext->recycler()->getNumberResult(-1 * value, aResult);
-#else
     return aContext->recycler()->getNumberResult(-value, aResult);
-#endif
 }
 
 TX_IMPL_EXPR_STUBS_1(UnaryExpr, NODESET_RESULT, expr)
diff --git a/dom/xslt/xslt/txMozillaStylesheetCompiler.cpp b/dom/xslt/xslt/txMozillaStylesheetCompiler.cpp
index 726441757..c9bcc31ff 100644
--- a/dom/xslt/xslt/txMozillaStylesheetCompiler.cpp
+++ b/dom/xslt/xslt/txMozillaStylesheetCompiler.cpp
@@ -462,10 +462,6 @@ txCompileObserver::startLoad(nsIURI* aUri, txStylesheetCompiler* aCompiler,
 
     nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel));
     if (httpChannel) {
-        httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"),
-                                      NS_LITERAL_CSTRING("*/*"),
-                                      false);
-
         nsCOMPtr<nsIURI> referrerURI;
         aReferrerPrincipal->GetURI(getter_AddRefs(referrerURI));
         if (referrerURI) {
diff --git a/dom/xul/nsXULElement.cpp b/dom/xul/nsXULElement.cpp
index 14fa898ab..e351a46eb 100644
--- a/dom/xul/nsXULElement.cpp
+++ b/dom/xul/nsXULElement.cpp
@@ -2173,7 +2173,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXULPrototypeNode)
         }
         ImplCycleCollectionTraverse(cb, elem->mChildren, "mChildren");
     }
-    NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsXULPrototypeNode)
     if (tmp->mType == nsXULPrototypeNode::eType_Script) {
diff --git a/dom/xul/nsXULPrototypeCache.cpp b/dom/xul/nsXULPrototypeCache.cpp
index 84a201d59..2c3454860 100644
--- a/dom/xul/nsXULPrototypeCache.cpp
+++ b/dom/xul/nsXULPrototypeCache.cpp
@@ -45,12 +45,6 @@ UpdategDisableXULCache()
     // Get the value of "nglayout.debug.disable_xul_cache" preference
     gDisableXULCache =
         Preferences::GetBool(kDisableXULCachePref, gDisableXULCache);
-
-    // Sets the flag if the XUL cache is disabled
-    if (gDisableXULCache) {
-        Telemetry::Accumulate(Telemetry::XUL_CACHE_DISABLED, true);
-    }
-
 }
 
 static void