Merge branch 'master' of https://github.com/MoonchildProductions/UXP

58 files changed, 14 insertions, 842 deletions

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/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/nsDocument.cpp b/dom/base/nsDocument.cpp
index 8acfd901a..ac9601caf 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"
@@ -12370,101 +12369,7 @@ MightBeAboutOrChromeScheme(nsIURI* aURI)
 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);
-        }
-      }
-    }
-  }
+/* STUB */
 }
 
 void
diff --git a/dom/base/nsFrameMessageManager.cpp b/dom/base/nsFrameMessageManager.cpp
index 6fffd376b..f173678b7 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"
@@ -716,9 +715,6 @@ AllowMessage(size_t aDataLength, const nsAString& aMessageName)
   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 +723,6 @@ AllowMessage(size_t aDataLength, const nsAString& aMessageName)
     return true;
   }
 
-  Telemetry::Accumulate(Telemetry::REJECTED_MESSAGE_MANAGER_MESSAGE,
-                        messageName);
-
   return false;
 }
 
@@ -2248,7 +2241,6 @@ 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/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 884ad69ca..88cebe42b 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -211,7 +211,6 @@
 #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"
@@ -1759,9 +1758,6 @@ nsGlobalWindow::~nsGlobalWindow()
 
     DropOuterWindowDocs();
   } else {
-    Telemetry::Accumulate(Telemetry::INNERWINDOWS_WITH_MUTATION_LISTENERS,
-                          mMutationBits ? 1 : 0);
-
     if (mListenerManager) {
       mListenerManager->Disconnect();
       mListenerManager = nullptr;
@@ -2695,7 +2691,6 @@ 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);
 }
 
@@ -3389,9 +3384,6 @@ 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 +6840,6 @@ 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);
@@ -11577,11 +11567,6 @@ 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() &&
@@ -11613,10 +11598,6 @@ 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);
diff --git a/dom/base/nsJSEnvironment.cpp b/dom/base/nsJSEnvironment.cpp
index 3be1a6d2f..4a984d294 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"
@@ -1477,22 +1476,8 @@ 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;
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/nsObjectLoadingContent.cpp b/dom/base/nsObjectLoadingContent.cpp
index 9e9dacf01..709c7aa56 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;
   }
 
@@ -1585,10 +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 +3793,6 @@ nsObjectLoadingContent::LegacyCall(JSContext* aCx,
     aRv.Throw(NS_ERROR_FAILURE);
     return;
   }
-
-  Telemetry::Accumulate(Telemetry::PLUGIN_CALLED_DIRECTLY, true);
 }
 
 void
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/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..14bc7e3e3 100644
--- a/dom/canvas/WebGLContext.cpp
+++ b/dom/canvas/WebGLContext.cpp
@@ -825,10 +825,6 @@ 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 +880,6 @@ 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 +901,6 @@ 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 +917,6 @@ 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 +929,6 @@ 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 +944,9 @@ 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 +958,6 @@ 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 +971,6 @@ 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 +979,6 @@ 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 +1062,6 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
 
     //////
 
-    failureId = NS_LITERAL_CSTRING("SUCCESS");
     return NS_OK;
 }
 
diff --git a/dom/crypto/WebCryptoTask.cpp b/dom/crypto/WebCryptoTask.cpp
index f5fc7b5bc..c4cc7080d 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;
@@ -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/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/fetch/Fetch.cpp b/dom/fetch/Fetch.cpp
index 5c05f3602..e2c139426 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();
     }
diff --git a/dom/fetch/FetchDriver.cpp b/dom/fetch/FetchDriver.cpp
index aac79b829..1791399b7 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(),
diff --git a/dom/geolocation/nsGeolocation.cpp b/dom/geolocation/nsGeolocation.cpp
index 2d84a3e11..201d4d89a 100644
--- a/dom/geolocation/nsGeolocation.cpp
+++ b/dom/geolocation/nsGeolocation.cpp
@@ -382,13 +382,6 @@ 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;
   }
@@ -403,9 +396,6 @@ 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;
@@ -415,12 +405,6 @@ nsGeolocationRequest::Allow(JS::HandleValue aChoices)
       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)) {
@@ -1110,7 +1094,6 @@ Geolocation::Update(nsIDOMGeoPosition *aSomewhere)
     if (coords) {
       double accuracy = -1;
       coords->GetAccuracy(&accuracy);
-      mozilla::Telemetry::Accumulate(mozilla::Telemetry::GEOLOCATION_ACCURACY_EXPONENTIAL, accuracy);
     }
   }
 
@@ -1135,8 +1118,6 @@ 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
@@ -1214,10 +1195,6 @@ 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),
@@ -1292,10 +1269,6 @@ 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++;
 
diff --git a/dom/html/HTMLFormElement.cpp b/dom/html/HTMLFormElement.cpp
index 5164391f8..0393ed3e0 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"
@@ -957,13 +956,6 @@ HTMLFormElement::DoSecureToInsecureSubmitCheck(nsIURI* aActionURL,
   *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/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..6171e1766 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"
@@ -1902,7 +1901,6 @@ 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);
 }
 
@@ -3693,7 +3691,6 @@ 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"));
   }
@@ -3745,7 +3742,6 @@ HTMLMediaElement::ReportTelemetry()
     }
   }
 
-  Telemetry::Accumulate(Telemetry::VIDEO_UNLOAD_STATE, state);
   LOG(LogLevel::Debug, ("%p VIDEO_UNLOAD_STATE = %d", this, state));
 
   FrameStatisticsData data;
@@ -3761,8 +3757,6 @@ HTMLMediaElement::ReportTelemetry()
         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);
       }
     }
   }
@@ -3774,10 +3768,8 @@ HTMLMediaElement::ReportTelemetry()
     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) {
@@ -3804,24 +3796,11 @@ HTMLMediaElement::ReportTelemetry()
       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()));
 
@@ -3832,24 +3811,12 @@ HTMLMediaElement::ReportTelemetry()
                                       / 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 {
@@ -3858,12 +3825,6 @@ HTMLMediaElement::ReportTelemetry()
         // 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()));
         }
@@ -6860,97 +6821,6 @@ 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/TextTrackManager.cpp b/dom/html/TextTrackManager.cpp
index 8110dab29..4266575f7 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"
@@ -824,24 +823,13 @@ TextTrackManager::NotifyReset()
 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));
+/* STUB */
 }
 
 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;
-  }
+/* STUB */
 }
 
 } // namespace dom
diff --git a/dom/html/nsTextEditorState.cpp b/dom/html/nsTextEditorState.cpp
index 187afb66d..0b4cb1920 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);
diff --git a/dom/ipc/ContentParent.cpp b/dom/ipc/ContentParent.cpp
index 0a07147bf..5c6aadb77 100644
--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -1718,9 +1718,6 @@ 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;
@@ -4778,7 +4775,7 @@ bool
 ContentParent::RecvAccumulateChildHistogram(
                 InfallibleTArray<Accumulation>&& aAccumulations)
 {
-  Telemetry::AccumulateChild(GeckoProcessType_Content, aAccumulations);
+  /* STUB */
   return true;
 }
 
@@ -4786,6 +4783,6 @@ bool
 ContentParent::RecvAccumulateChildKeyedHistogram(
                 InfallibleTArray<KeyedAccumulation>&& aAccumulations)
 {
-  Telemetry::AccumulateChildKeyed(GeckoProcessType_Content, aAccumulations);
+  /* STUB */
   return true;
 }
diff --git a/dom/media/AudioStream.cpp b/dom/media/AudioStream.cpp
index 54cf7b965..896dee407 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"
@@ -378,8 +377,6 @@ AudioStream::OpenCubeb(cubeb* aContext, cubeb_stream_params& aParams,
   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..93792e63b 100644
--- a/dom/media/CubebUtils.cpp
+++ b/dom/media/CubebUtils.cpp
@@ -248,14 +248,9 @@ void ReportCubebBackendUsed()
   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)
@@ -267,9 +262,6 @@ void ReportCubebStreamInitFailure(bool aIsFirst)
     // 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()
diff --git a/dom/media/DecoderTraits.cpp b/dom/media/DecoderTraits.cpp
index ddd35fe0d..56ebd9ce9 100644
--- a/dom/media/DecoderTraits.cpp
+++ b/dom/media/DecoderTraits.cpp
@@ -288,7 +288,7 @@ CanHandleMediaType(const MediaContentType& aType,
   MOZ_ASSERT(NS_IsMainThread());
 
   if (IsHttpLiveStreamingType(aType.GetMIMEType())) {
-    Telemetry::Accumulate(Telemetry::MEDIA_HLS_CANPLAY_REQUESTED, true);
+    /* Telemetry STUB */
   }
 
   if (aType.HaveCodecs()) {
@@ -433,11 +433,6 @@ InstantiateDecoder(const nsACString& aType,
   }
 #endif
 
-  if (IsHttpLiveStreamingType(aType)) {
-    // We don't have an HLS decoder.
-    Telemetry::Accumulate(Telemetry::MEDIA_HLS_DECODER_SUCCESS, false);
-  }
-
   return nullptr;
 }
 
diff --git a/dom/media/MediaDecoder.cpp b/dom/media/MediaDecoder.cpp
index 9334d1bcb..d027818de 100644
--- a/dom/media/MediaDecoder.cpp
+++ b/dom/media/MediaDecoder.cpp
@@ -877,7 +877,6 @@ MediaDecoder::EnsureTelemetryReported()
   }
   for (const nsCString& codec : codecs) {
     DECODER_LOG("Telemetry MEDIA_CODEC_USED= '%s'", codec.get());
-    Telemetry::Accumulate(Telemetry::ID::MEDIA_CODEC_USED, codec);
   }
 
   mTelemetryReported = true;
diff --git a/dom/media/MediaDecoderStateMachine.cpp b/dom/media/MediaDecoderStateMachine.cpp
index c586139ad..5bc1d95ef 100644
--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -1178,40 +1178,7 @@ 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));
+/* STUB */
 }
 
 void
diff --git a/dom/media/MediaManager.cpp b/dom/media/MediaManager.cpp
index ba6b4cd47..baaf45416 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"
@@ -2058,28 +2057,6 @@ MediaManager::GetUserMedia(nsPIDOMWindowInner* aWindow,
                       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);
   if (NS_WARN_IF(NS_FAILED(rv))) {
@@ -2098,8 +2075,6 @@ 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 +2157,6 @@ 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:
diff --git a/dom/media/VideoUtils.cpp b/dom/media/VideoUtils.cpp
index 5c00e54bc..b1a202c03 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"
@@ -248,24 +247,6 @@ 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;
 }
 
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/MP4Demuxer.cpp b/dom/media/fmp4/MP4Demuxer.cpp
index 646897468..5a637b003 100644
--- a/dom/media/fmp4/MP4Demuxer.cpp
+++ b/dom/media/fmp4/MP4Demuxer.cpp
@@ -81,35 +81,11 @@ private:
 bool
 AccumulateSPSTelemetry(const MediaByteBuffer* aExtradata)
 {
+  // XXX: Do we still need this without telemetry?
   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;
 }
 
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/wmf/DXVA2Manager.cpp b/dom/media/platforms/wmf/DXVA2Manager.cpp
index 0c1734c54..1226ea621 100644
--- a/dom/media/platforms/wmf/DXVA2Manager.cpp
+++ b/dom/media/platforms/wmf/DXVA2Manager.cpp
@@ -14,7 +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"
@@ -442,9 +441,6 @@ 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 +771,6 @@ 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/WMFMediaDataDecoder.cpp b/dom/media/platforms/wmf/WMFMediaDataDecoder.cpp
index d2c13eac7..15e2e1097 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"
@@ -67,7 +66,7 @@ SendTelemetry(unsigned long hr)
 
   nsCOMPtr<nsIRunnable> runnable = NS_NewRunnableFunction(
     [sample] {
-      Telemetry::Accumulate(Telemetry::MEDIA_WMF_DECODE_ERROR, sample);
+      /* Telemetry STUB */
     });
   NS_DispatchToMainThread(runnable);
 }
diff --git a/dom/media/platforms/wmf/WMFVideoMFTManager.cpp b/dom/media/platforms/wmf/WMFVideoMFTManager.cpp
index 291bc5b74..8a51f817a 100644
--- a/dom/media/platforms/wmf/WMFVideoMFTManager.cpp
+++ b/dom/media/platforms/wmf/WMFVideoMFTManager.cpp
@@ -128,7 +128,6 @@ 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 +510,6 @@ 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/webaudio/MediaBufferDecoder.cpp b/dom/media/webaudio/MediaBufferDecoder.cpp
index e9f1d5a47..2ee11eacd 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"
 
@@ -302,7 +301,6 @@ 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/notification/Notification.cpp b/dom/notification/Notification.cpp
index 1dd5724e4..71c4916b9 100644
--- a/dom/notification/Notification.cpp
+++ b/dom/notification/Notification.cpp
@@ -642,8 +642,6 @@ NotificationPermissionRequest::ResolvePromise()
     mCallback->Call(mPermission, error);
     rv = error.StealNSResult();
   }
-  Telemetry::Accumulate(
-    Telemetry::WEB_NOTIFICATION_REQUEST_PERMISSION_CALLBACK, !!mCallback);
   mPromise->MaybeResolve(mPermission);
   return rv;
 }
@@ -750,11 +748,6 @@ NotificationTelemetryService::RecordPermissions()
     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);
-    }
   }
 }
 
@@ -800,9 +793,6 @@ NotificationTelemetryService::RecordDNDSupported()
   if (NS_FAILED(rv)) {
     return;
   }
-
-  Telemetry::Accumulate(
-    Telemetry::ALERTS_SERVICE_DND_SUPPORTED_FLAG, true);
 }
 
 nsresult
@@ -819,7 +809,6 @@ NotificationTelemetryService::RecordSender(nsIPrincipal* aPrincipal)
   }
   if (!mOrigins.Contains(origin)) {
     mOrigins.PutEntry(origin);
-    Telemetry::Accumulate(Telemetry::WEB_NOTIFICATION_SENDERS, 1);
   }
   return NS_OK;
 }
@@ -829,21 +818,7 @@ 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);
-    }
-  }
+  /* STUB */
   return NS_OK;
 }
 
@@ -1407,7 +1382,6 @@ 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 +1391,7 @@ 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);
     }
@@ -1433,21 +1404,7 @@ NotificationObserver::Observe(nsISupports* aSubject, const char* 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/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..fee2d2f98 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"
@@ -2504,6 +2503,5 @@ 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..f04cd209c 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"
@@ -1172,11 +1171,6 @@ 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();
 
@@ -2203,12 +2197,8 @@ public:
 void
 PluginModuleParent::AccumulateModuleInitBlockedTime()
 {
-    if (mPluginName.IsEmpty()) {
-        GetPluginDetails();
-    }
-    Telemetry::Accumulate(Telemetry::BLOCKED_ON_PLUGIN_MODULE_INIT_MS,
-                          GetHistogramKey(),
-                          static_cast<uint32_t>(mTimeBlocked.ToMilliseconds()));
+    // XXX: mTimeBlocked can probably go if not used for anything besides
+    // telemetry.
     mTimeBlocked = TimeDuration();
 }
 
diff --git a/dom/security/nsMixedContentBlocker.cpp b/dom/security/nsMixedContentBlocker.cpp
index c03628da0..5f41f414d 100644
--- a/dom/security/nsMixedContentBlocker.cpp
+++ b/dom/security/nsMixedContentBlocker.cpp
@@ -983,44 +983,5 @@ enum MixedContentHSTSState {
 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);
-    }
-  }
+/* STUB */
 }
\ No newline at end of file
diff --git a/dom/storage/DOMStorageCache.cpp b/dom/storage/DOMStorageCache.cpp
index 811f79fd3..a6aa17424 100644
--- a/dom/storage/DOMStorageCache.cpp
+++ b/dom/storage/DOMStorageCache.cpp
@@ -309,7 +309,7 @@ public:
   explicit TelemetryAutoTimer(Telemetry::ID aId)
     : id(aId), start(TimeStamp::Now()) {}
   ~TelemetryAutoTimer()
-    { Telemetry::AccumulateDelta_impl<Telemetry::Millisecond>::compute(id, start); }
+    { /* STUB */ }
 private:
   Telemetry::ID id;
   const TimeStamp start;
@@ -329,9 +329,6 @@ DOMStorageCache::WaitForPreload(Telemetry::ID aTelemetryID)
   // Telemetry of rates of pending preloads
   if (!mPreloadTelemetryRecorded) {
     mPreloadTelemetryRecorded = true;
-    Telemetry::Accumulate(
-      Telemetry::LOCALDOMSTORAGE_PRELOAD_PENDING_ON_FIRST_ACCESS,
-      !loaded);
   }
 
   if (loaded) {
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/workers/RuntimeService.cpp b/dom/workers/RuntimeService.cpp
index e1910536f..1f49e16dd 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"
@@ -1534,7 +1533,6 @@ RuntimeService::RegisterWorker(WorkerPrivate* aWorkerPrivate)
   const bool isDedicatedWorker = aWorkerPrivate->IsDedicatedWorker();
   if (isServiceWorker) {
     AssertIsOnMainThread();
-    Telemetry::Accumulate(Telemetry::SERVICE_WORKER_SPAWN_ATTEMPTS, 1);
   }
 
   nsCString sharedWorkerScriptSpec;
@@ -1586,14 +1584,6 @@ 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 +1659,6 @@ RuntimeService::RegisterWorker(WorkerPrivate* aWorkerPrivate)
 
   if (isServiceWorker) {
     AssertIsOnMainThread();
-    Telemetry::Accumulate(Telemetry::SERVICE_WORKER_WAS_SPAWNED, 1);
   }
   return true;
 }
@@ -1766,8 +1755,6 @@ 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/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/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/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/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/WorkerRunnable.cpp b/dom/workers/WorkerRunnable.cpp
index 6bbe40f66..9e6d4cfb8 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"
@@ -572,8 +571,6 @@ WorkerMainThreadRunnable::Dispatch(Status aFailStatus, ErrorResult& aRv)
 {
   mWorkerPrivate->AssertIsOnWorkerThread();
 
-  TimeStamp startTime = TimeStamp::NowLoRes();
-
   AutoSyncLoopHolder syncLoop(mWorkerPrivate, aFailStatus);
 
   mSyncLoopTarget = syncLoop.GetEventTarget();
@@ -590,11 +587,6 @@ WorkerMainThreadRunnable::Dispatch(Status aFailStatus, ErrorResult& aRv)
   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
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/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