Add m-esr52 at 52.6.0

1 files changed, 3659 insertions, 0 deletions

diff --git a/dom/base/nsFocusManager.cpp b/dom/base/nsFocusManager.cpp
new file mode 100644
index 000000000..fb350fa12
--- /dev/null
+++ b/dom/base/nsFocusManager.cpp
@@ -0,0 +1,3659 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/TabParent.h"
+
+#include "nsFocusManager.h"
+
+#include "AccessibleCaretEventHub.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsGkAtoms.h"
+#include "nsContentUtils.h"
+#include "nsIDocument.h"
+#include "nsIEditor.h"
+#include "nsPIDOMWindow.h"
+#include "nsIDOMChromeWindow.h"
+#include "nsIDOMElement.h"
+#include "nsIDOMDocument.h"
+#include "nsIDOMRange.h"
+#include "nsIHTMLDocument.h"
+#include "nsIDocShell.h"
+#include "nsIDocShellTreeOwner.h"
+#include "nsIFormControl.h"
+#include "nsLayoutUtils.h"
+#include "nsIPresShell.h"
+#include "nsFrameTraversal.h"
+#include "nsIWebNavigation.h"
+#include "nsCaret.h"
+#include "nsIBaseWindow.h"
+#include "nsIXULWindow.h"
+#include "nsViewManager.h"
+#include "nsFrameSelection.h"
+#include "mozilla/dom/Selection.h"
+#include "nsXULPopupManager.h"
+#include "nsMenuPopupFrame.h"
+#include "nsIScriptObjectPrincipal.h"
+#include "nsIPrincipal.h"
+#include "nsIObserverService.h"
+#include "nsIObjectFrame.h"
+#include "nsBindingManager.h"
+#include "nsStyleCoord.h"
+#include "TabChild.h"
+#include "nsFrameLoader.h"
+#include "nsNumberControlFrame.h"
+
+#include "mozilla/ContentEvents.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/HTMLInputElement.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/EventStateManager.h"
+#include "mozilla/EventStates.h"
+#include "mozilla/IMEStateManager.h"
+#include "mozilla/LookAndFeel.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/Services.h"
+#include "mozilla/Unused.h"
+#include <algorithm>
+
+#ifdef MOZ_XUL
+#include "nsIDOMXULTextboxElement.h"
+#include "nsIDOMXULMenuListElement.h"
+#endif
+
+#ifdef ACCESSIBILITY
+#include "nsAccessibilityService.h"
+#endif
+
+#ifndef XP_MACOSX
+#include "nsIScriptError.h"
+#endif
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::widget;
+
+// Two types of focus pr logging are available:
+//   'Focus' for normal focus manager calls
+//   'FocusNavigation' for tab and document navigation
+LazyLogModule gFocusLog("Focus");
+LazyLogModule gFocusNavigationLog("FocusNavigation");
+
+#define LOGFOCUS(args) MOZ_LOG(gFocusLog, mozilla::LogLevel::Debug, args)
+#define LOGFOCUSNAVIGATION(args) MOZ_LOG(gFocusNavigationLog, mozilla::LogLevel::Debug, args)
+
+#define LOGTAG(log, format, content)                            \
+  if (MOZ_LOG_TEST(log, LogLevel::Debug)) {                         \
+    nsAutoCString tag(NS_LITERAL_CSTRING("(none)"));            \
+    if (content) {                                              \
+      content->NodeInfo()->NameAtom()->ToUTF8String(tag);       \
+    }                                                           \
+    MOZ_LOG(log, LogLevel::Debug, (format, tag.get()));             \
+  }
+
+#define LOGCONTENT(format, content) LOGTAG(gFocusLog, format, content)
+#define LOGCONTENTNAVIGATION(format, content) LOGTAG(gFocusNavigationLog, format, content)
+
+struct nsDelayedBlurOrFocusEvent
+{
+  nsDelayedBlurOrFocusEvent(EventMessage aEventMessage,
+                            nsIPresShell* aPresShell,
+                            nsIDocument* aDocument,
+                            EventTarget* aTarget,
+                            EventTarget* aRelatedTarget)
+    : mPresShell(aPresShell)
+    , mDocument(aDocument)
+    , mTarget(aTarget)
+    , mEventMessage(aEventMessage)
+    , mRelatedTarget(aRelatedTarget)
+ {
+ }
+
+  nsDelayedBlurOrFocusEvent(const nsDelayedBlurOrFocusEvent& aOther)
+    : mPresShell(aOther.mPresShell)
+    , mDocument(aOther.mDocument)
+    , mTarget(aOther.mTarget)
+    , mEventMessage(aOther.mEventMessage)
+  {
+  }
+
+  nsCOMPtr<nsIPresShell> mPresShell;
+  nsCOMPtr<nsIDocument> mDocument;
+  nsCOMPtr<EventTarget> mTarget;
+  EventMessage mEventMessage;
+  nsCOMPtr<EventTarget> mRelatedTarget;
+};
+
+inline void ImplCycleCollectionUnlink(nsDelayedBlurOrFocusEvent& aField)
+{
+  aField.mPresShell = nullptr;
+  aField.mDocument = nullptr;
+  aField.mTarget = nullptr;
+  aField.mRelatedTarget = nullptr;
+}
+
+inline void
+ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
+                            nsDelayedBlurOrFocusEvent& aField,
+                            const char* aName,
+                            uint32_t aFlags = 0)
+{
+  CycleCollectionNoteChild(aCallback, aField.mPresShell.get(), aName, aFlags);
+  CycleCollectionNoteChild(aCallback, aField.mDocument.get(), aName, aFlags);
+  CycleCollectionNoteChild(aCallback, aField.mTarget.get(), aName, aFlags);
+  CycleCollectionNoteChild(aCallback, aField.mRelatedTarget.get(), aName, aFlags);
+}
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsFocusManager)
+  NS_INTERFACE_MAP_ENTRY(nsIFocusManager)
+  NS_INTERFACE_MAP_ENTRY(nsIObserver)
+  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIFocusManager)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsFocusManager)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsFocusManager)
+
+NS_IMPL_CYCLE_COLLECTION(nsFocusManager,
+                         mActiveWindow,
+                         mFocusedWindow,
+                         mFocusedContent,
+                         mFirstBlurEvent,
+                         mFirstFocusEvent,
+                         mWindowBeingLowered,
+                         mDelayedBlurFocusEvents,
+                         mMouseButtonEventHandlingDocument)
+
+nsFocusManager* nsFocusManager::sInstance = nullptr;
+bool nsFocusManager::sMouseFocusesFormControl = false;
+bool nsFocusManager::sTestMode = false;
+
+static const char* kObservedPrefs[] = {
+  "accessibility.browsewithcaret",
+  "accessibility.tabfocus_applies_to_xul",
+  "accessibility.mouse_focuses_formcontrol",
+  "focusmanager.testmode",
+  nullptr
+};
+
+nsFocusManager::nsFocusManager()
+{ }
+
+nsFocusManager::~nsFocusManager()
+{
+  Preferences::RemoveObservers(this, kObservedPrefs);
+
+  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+  if (obs) {
+    obs->RemoveObserver(this, "xpcom-shutdown");
+  }
+}
+
+// static
+nsresult
+nsFocusManager::Init()
+{
+  nsFocusManager* fm = new nsFocusManager();
+  NS_ADDREF(fm);
+  sInstance = fm;
+
+  nsIContent::sTabFocusModelAppliesToXUL =
+    Preferences::GetBool("accessibility.tabfocus_applies_to_xul",
+                         nsIContent::sTabFocusModelAppliesToXUL);
+
+  sMouseFocusesFormControl =
+    Preferences::GetBool("accessibility.mouse_focuses_formcontrol", false);
+
+  sTestMode = Preferences::GetBool("focusmanager.testmode", false);
+
+  Preferences::AddWeakObservers(fm, kObservedPrefs);
+
+  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+  if (obs) {
+    obs->AddObserver(fm, "xpcom-shutdown", true);
+  }
+
+  return NS_OK;
+}
+
+// static
+void
+nsFocusManager::Shutdown()
+{
+  NS_IF_RELEASE(sInstance);
+}
+
+NS_IMETHODIMP
+nsFocusManager::Observe(nsISupports *aSubject,
+                        const char *aTopic,
+                        const char16_t *aData)
+{
+  if (!nsCRT::strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
+    nsDependentString data(aData);
+    if (data.EqualsLiteral("accessibility.browsewithcaret")) {
+      UpdateCaretForCaretBrowsingMode();
+    }
+    else if (data.EqualsLiteral("accessibility.tabfocus_applies_to_xul")) {
+      nsIContent::sTabFocusModelAppliesToXUL =
+        Preferences::GetBool("accessibility.tabfocus_applies_to_xul",
+                             nsIContent::sTabFocusModelAppliesToXUL);
+    }
+    else if (data.EqualsLiteral("accessibility.mouse_focuses_formcontrol")) {
+      sMouseFocusesFormControl =
+        Preferences::GetBool("accessibility.mouse_focuses_formcontrol",
+                             false);
+    }
+    else if (data.EqualsLiteral("focusmanager.testmode")) {
+      sTestMode = Preferences::GetBool("focusmanager.testmode", false);
+    }
+  } else if (!nsCRT::strcmp(aTopic, "xpcom-shutdown")) {
+    mActiveWindow = nullptr;
+    mFocusedWindow = nullptr;
+    mFocusedContent = nullptr;
+    mFirstBlurEvent = nullptr;
+    mFirstFocusEvent = nullptr;
+    mWindowBeingLowered = nullptr;
+    mDelayedBlurFocusEvents.Clear();
+    mMouseButtonEventHandlingDocument = nullptr;
+  }
+
+  return NS_OK;
+}
+
+// given a frame content node, retrieve the nsIDOMWindow displayed in it 
+static nsPIDOMWindowOuter*
+GetContentWindow(nsIContent* aContent)
+{
+  nsIDocument* doc = aContent->GetComposedDoc();
+  if (doc) {
+    nsIDocument* subdoc = doc->GetSubDocumentFor(aContent);
+    if (subdoc)
+      return subdoc->GetWindow();
+  }
+
+  return nullptr;
+}
+
+// get the current window for the given content node 
+static nsPIDOMWindowOuter*
+GetCurrentWindow(nsIContent* aContent)
+{
+  nsIDocument* doc = aContent->GetComposedDoc();
+  return doc ? doc->GetWindow() : nullptr;
+}
+
+// static
+nsIContent*
+nsFocusManager::GetFocusedDescendant(nsPIDOMWindowOuter* aWindow, bool aDeep,
+                                     nsPIDOMWindowOuter** aFocusedWindow)
+{
+  NS_ENSURE_TRUE(aWindow, nullptr);
+
+  *aFocusedWindow = nullptr;
+
+  nsIContent* currentContent = nullptr;
+  nsPIDOMWindowOuter* window = aWindow;
+  while (window) {
+    *aFocusedWindow = window;
+    currentContent = window->GetFocusedNode();
+    if (!currentContent || !aDeep)
+      break;
+
+    window = GetContentWindow(currentContent);
+  }
+
+  NS_IF_ADDREF(*aFocusedWindow);
+
+  return currentContent;
+}
+
+// static
+nsIContent*
+nsFocusManager::GetRedirectedFocus(nsIContent* aContent)
+{
+  // For input number, redirect focus to our anonymous text control.
+  if (aContent->IsHTMLElement(nsGkAtoms::input)) {
+    bool typeIsNumber =
+      static_cast<dom::HTMLInputElement*>(aContent)->GetType() ==
+        NS_FORM_INPUT_NUMBER;
+
+    if (typeIsNumber) {
+      nsNumberControlFrame* numberControlFrame =
+        do_QueryFrame(aContent->GetPrimaryFrame());
+
+      if (numberControlFrame) {
+        HTMLInputElement* textControl =
+          numberControlFrame->GetAnonTextControl();
+        return static_cast<nsIContent*>(textControl);
+      }
+    }
+  }
+
+#ifdef MOZ_XUL
+  if (aContent->IsXULElement()) {
+    nsCOMPtr<nsIDOMNode> inputField;
+
+    nsCOMPtr<nsIDOMXULTextBoxElement> textbox = do_QueryInterface(aContent);
+    if (textbox) {
+      textbox->GetInputField(getter_AddRefs(inputField));
+    }
+    else {
+      nsCOMPtr<nsIDOMXULMenuListElement> menulist = do_QueryInterface(aContent);
+      if (menulist) {
+        menulist->GetInputField(getter_AddRefs(inputField));
+      }
+      else if (aContent->IsXULElement(nsGkAtoms::scale)) {
+        nsCOMPtr<nsIDocument> doc = aContent->GetComposedDoc();
+        if (!doc)
+          return nullptr;
+
+        nsINodeList* children = doc->BindingManager()->GetAnonymousNodesFor(aContent);
+        if (children) {
+          nsIContent* child = children->Item(0);
+          if (child && child->IsXULElement(nsGkAtoms::slider))
+            return child;
+        }
+      }
+    }
+
+    if (inputField) {
+      nsCOMPtr<nsIContent> retval = do_QueryInterface(inputField);
+      return retval;
+    }
+  }
+#endif
+
+  return nullptr;
+}
+
+// static
+InputContextAction::Cause
+nsFocusManager::GetFocusMoveActionCause(uint32_t aFlags)
+{
+  if (aFlags & nsIFocusManager::FLAG_BYTOUCH) {
+    return InputContextAction::CAUSE_TOUCH;
+  } else if (aFlags & nsIFocusManager::FLAG_BYMOUSE) {
+    return InputContextAction::CAUSE_MOUSE;
+  } else if (aFlags & nsIFocusManager::FLAG_BYKEY) {
+    return InputContextAction::CAUSE_KEY;
+  }
+  return InputContextAction::CAUSE_UNKNOWN;
+}
+
+NS_IMETHODIMP
+nsFocusManager::GetActiveWindow(mozIDOMWindowProxy** aWindow)
+{
+  NS_IF_ADDREF(*aWindow = mActiveWindow);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::SetActiveWindow(mozIDOMWindowProxy* aWindow)
+{
+  NS_ENSURE_STATE(aWindow);
+  
+  // only top-level windows can be made active
+  nsCOMPtr<nsPIDOMWindowOuter> piWindow = nsPIDOMWindowOuter::From(aWindow);
+  NS_ENSURE_TRUE(piWindow == piWindow->GetPrivateRoot(), NS_ERROR_INVALID_ARG);
+
+  RaiseWindow(piWindow);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::GetFocusedWindow(mozIDOMWindowProxy** aFocusedWindow)
+{
+  NS_IF_ADDREF(*aFocusedWindow = mFocusedWindow);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsFocusManager::SetFocusedWindow(mozIDOMWindowProxy* aWindowToFocus)
+{
+  LOGFOCUS(("<<SetFocusedWindow begin>>"));
+
+  nsCOMPtr<nsPIDOMWindowOuter> windowToFocus = nsPIDOMWindowOuter::From(aWindowToFocus);
+  NS_ENSURE_TRUE(windowToFocus, NS_ERROR_FAILURE);
+
+  windowToFocus = windowToFocus->GetOuterWindow();
+
+  nsCOMPtr<Element> frameElement = windowToFocus->GetFrameElementInternal();
+  if (frameElement) {
+    // pass false for aFocusChanged so that the caret does not get updated
+    // and scrolling does not occur.
+    SetFocusInner(frameElement, 0, false, true);
+  }
+  else {
+    // this is a top-level window. If the window has a child frame focused,
+    // clear the focus. Otherwise, focus should already be in this frame, or
+    // already cleared. This ensures that focus will be in this frame and not
+    // in a child.
+    nsIContent* content = windowToFocus->GetFocusedNode();
+    if (content) {
+      if (nsCOMPtr<nsPIDOMWindowOuter> childWindow = GetContentWindow(content))
+        ClearFocus(windowToFocus);
+    }
+  }
+
+  nsCOMPtr<nsPIDOMWindowOuter> rootWindow = windowToFocus->GetPrivateRoot();
+  if (rootWindow)
+    RaiseWindow(rootWindow);
+
+  LOGFOCUS(("<<SetFocusedWindow end>>"));
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::GetFocusedElement(nsIDOMElement** aFocusedElement)
+{
+  if (mFocusedContent)
+    CallQueryInterface(mFocusedContent, aFocusedElement);
+  else
+    *aFocusedElement = nullptr;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::GetLastFocusMethod(mozIDOMWindowProxy* aWindow, uint32_t* aLastFocusMethod)
+{
+  // the focus method is stored on the inner window
+  nsCOMPtr<nsPIDOMWindowOuter> window;
+  if (aWindow) {
+    window = nsPIDOMWindowOuter::From(aWindow);
+  }
+  if (!window)
+    window = mFocusedWindow;
+
+  *aLastFocusMethod = window ? window->GetFocusMethod() : 0;
+
+  NS_ASSERTION((*aLastFocusMethod & FOCUSMETHOD_MASK) == *aLastFocusMethod,
+               "invalid focus method");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::SetFocus(nsIDOMElement* aElement, uint32_t aFlags)
+{
+  LOGFOCUS(("<<SetFocus begin>>"));
+
+  nsCOMPtr<nsIContent> newFocus = do_QueryInterface(aElement);
+  NS_ENSURE_ARG(newFocus);
+
+  SetFocusInner(newFocus, aFlags, true, true);
+
+  LOGFOCUS(("<<SetFocus end>>"));
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::ElementIsFocusable(nsIDOMElement* aElement, uint32_t aFlags,
+                                   bool* aIsFocusable)
+{
+  NS_ENSURE_TRUE(aElement, NS_ERROR_INVALID_ARG);
+
+  nsCOMPtr<nsIContent> aContent = do_QueryInterface(aElement);
+
+  *aIsFocusable = CheckIfFocusable(aContent, aFlags) != nullptr;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::MoveFocus(mozIDOMWindowProxy* aWindow, nsIDOMElement* aStartElement,
+                          uint32_t aType, uint32_t aFlags, nsIDOMElement** aElement)
+{
+  *aElement = nullptr;
+
+  LOGFOCUS(("<<MoveFocus begin Type: %d Flags: %x>>", aType, aFlags));
+
+  if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug) && mFocusedWindow) {
+    nsIDocument* doc = mFocusedWindow->GetExtantDoc();
+    if (doc && doc->GetDocumentURI()) {
+      LOGFOCUS((" Focused Window: %p %s",
+                mFocusedWindow.get(),
+                doc->GetDocumentURI()->GetSpecOrDefault().get()));
+    }
+  }
+
+  LOGCONTENT("  Current Focus: %s", mFocusedContent.get());
+
+  // use FLAG_BYMOVEFOCUS when switching focus with MoveFocus unless one of
+  // the other focus methods is already set, or we're just moving to the root
+  // or caret position.
+  if (aType != MOVEFOCUS_ROOT && aType != MOVEFOCUS_CARET &&
+      (aFlags & FOCUSMETHOD_MASK) == 0) {
+    aFlags |= FLAG_BYMOVEFOCUS;
+  }
+
+  nsCOMPtr<nsPIDOMWindowOuter> window;
+  nsCOMPtr<nsIContent> startContent;
+  if (aStartElement) {
+    startContent = do_QueryInterface(aStartElement);
+    NS_ENSURE_TRUE(startContent, NS_ERROR_INVALID_ARG);
+
+    window = GetCurrentWindow(startContent);
+  }
+  else {
+    window = aWindow ? nsPIDOMWindowOuter::From(aWindow) : mFocusedWindow.get();
+    NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
+  }
+
+  NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
+
+  bool noParentTraversal = aFlags & FLAG_NOPARENTFRAME;
+  nsCOMPtr<nsIContent> newFocus;
+  nsresult rv = DetermineElementToMoveFocus(window, startContent, aType, noParentTraversal,
+                                            getter_AddRefs(newFocus));
+  if (rv == NS_SUCCESS_DOM_NO_OPERATION) {
+    return NS_OK;
+  }
+
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  LOGCONTENTNAVIGATION("Element to be focused: %s", newFocus.get());
+
+  if (newFocus) {
+    // for caret movement, pass false for the aFocusChanged argument,
+    // otherwise the caret will end up moving to the focus position. This
+    // would be a problem because the caret would move to the beginning of the
+    // focused link making it impossible to navigate the caret over a link.
+    SetFocusInner(newFocus, aFlags, aType != MOVEFOCUS_CARET, true);
+    CallQueryInterface(newFocus, aElement);
+  }
+  else if (aType == MOVEFOCUS_ROOT || aType == MOVEFOCUS_CARET) {
+    // no content was found, so clear the focus for these two types.
+    ClearFocus(window);
+  }
+
+  LOGFOCUS(("<<MoveFocus end>>"));
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::ClearFocus(mozIDOMWindowProxy* aWindow)
+{
+  LOGFOCUS(("<<ClearFocus begin>>"));
+
+  // if the window to clear is the focused window or an ancestor of the
+  // focused window, then blur the existing focused content. Otherwise, the
+  // focus is somewhere else so just update the current node.
+  NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
+  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
+
+  if (IsSameOrAncestor(window, mFocusedWindow)) {
+    bool isAncestor = (window != mFocusedWindow);
+    if (Blur(window, nullptr, isAncestor, true)) {
+      // if we are clearing the focus on an ancestor of the focused window,
+      // the ancestor will become the new focused window, so focus it
+      if (isAncestor)
+        Focus(window, nullptr, 0, true, false, false, true);
+    }
+  }
+  else {
+    window->SetFocusedNode(nullptr);
+  }
+
+  LOGFOCUS(("<<ClearFocus end>>"));
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::GetFocusedElementForWindow(mozIDOMWindowProxy* aWindow,
+                                           bool aDeep,
+                                           mozIDOMWindowProxy** aFocusedWindow,
+                                           nsIDOMElement** aElement)
+{
+  *aElement = nullptr;
+  if (aFocusedWindow)
+    *aFocusedWindow = nullptr;
+
+  NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
+  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
+
+  nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
+  nsCOMPtr<nsIContent> focusedContent =
+    GetFocusedDescendant(window, aDeep, getter_AddRefs(focusedWindow));
+  if (focusedContent)
+    CallQueryInterface(focusedContent, aElement);
+
+  if (aFocusedWindow)
+    NS_IF_ADDREF(*aFocusedWindow = focusedWindow);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::MoveCaretToFocus(mozIDOMWindowProxy* aWindow)
+{
+  nsCOMPtr<nsIWebNavigation> webnav = do_GetInterface(aWindow);
+  nsCOMPtr<nsIDocShellTreeItem> dsti = do_QueryInterface(webnav);
+  if (dsti) {
+    if (dsti->ItemType() != nsIDocShellTreeItem::typeChrome) {
+      nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(dsti);
+      NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);
+
+      // don't move the caret for editable documents
+      bool isEditable;
+      docShell->GetEditable(&isEditable);
+      if (isEditable)
+        return NS_OK;
+
+      nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
+      NS_ENSURE_TRUE(presShell, NS_ERROR_FAILURE);
+
+      nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
+      nsCOMPtr<nsIContent> content = window->GetFocusedNode();
+      if (content)
+        MoveCaretToFocus(presShell, content);
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::WindowRaised(mozIDOMWindowProxy* aWindow)
+{
+  NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
+  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
+
+  if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
+    LOGFOCUS(("Window %p Raised [Currently: %p %p]", aWindow, mActiveWindow.get(), mFocusedWindow.get()));
+    nsIDocument* doc = window->GetExtantDoc();
+    if (doc && doc->GetDocumentURI()) {
+      LOGFOCUS(("  Raised Window: %p %s", aWindow,
+                doc->GetDocumentURI()->GetSpecOrDefault().get()));
+    }
+    if (mActiveWindow) {
+      doc = mActiveWindow->GetExtantDoc();
+      if (doc && doc->GetDocumentURI()) {
+        LOGFOCUS(("  Active Window: %p %s", mActiveWindow.get(),
+                  doc->GetDocumentURI()->GetSpecOrDefault().get()));
+      }
+    }
+  }
+
+  if (mActiveWindow == window) {
+    // The window is already active, so there is no need to focus anything,
+    // but make sure that the right widget is focused. This is a special case
+    // for Windows because when restoring a minimized window, a second
+    // activation will occur and the top-level widget could be focused instead
+    // of the child we want. We solve this by calling SetFocus to ensure that
+    // what the focus manager thinks should be the current widget is actually
+    // focused.
+    EnsureCurrentWidgetFocused();
+    return NS_OK;
+  }
+
+  // lower the existing window, if any. This shouldn't happen usually.
+  if (mActiveWindow)
+    WindowLowered(mActiveWindow);
+
+  nsCOMPtr<nsIDocShellTreeItem> docShellAsItem = window->GetDocShell();
+  // If there's no docShellAsItem, this window must have been closed,
+  // in that case there is no tree owner.
+  NS_ENSURE_TRUE(docShellAsItem, NS_OK);
+
+  // set this as the active window
+  mActiveWindow = window;
+
+  // ensure that the window is enabled and visible
+  nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
+  docShellAsItem->GetTreeOwner(getter_AddRefs(treeOwner));
+  nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(treeOwner);
+  if (baseWindow) {
+    bool isEnabled = true;
+    if (NS_SUCCEEDED(baseWindow->GetEnabled(&isEnabled)) && !isEnabled) {
+      return NS_ERROR_FAILURE;
+    }
+
+    if (!sTestMode) {
+      baseWindow->SetVisibility(true);
+    }
+  }
+
+  // If this is a parent or single process window, send the activate event.
+  // Events for child process windows will be sent when ParentActivated
+  // is called.
+  if (XRE_IsParentProcess()) {
+    ActivateOrDeactivate(window, true);
+  }
+
+  // retrieve the last focused element within the window that was raised
+  nsCOMPtr<nsPIDOMWindowOuter> currentWindow;
+  nsCOMPtr<nsIContent> currentFocus =
+    GetFocusedDescendant(window, true, getter_AddRefs(currentWindow));
+
+  NS_ASSERTION(currentWindow, "window raised with no window current");
+  if (!currentWindow)
+    return NS_OK;
+
+  // If there is no nsIXULWindow, then this is an embedded or child process window.
+  // Pass false for aWindowRaised so that commands get updated.
+  nsCOMPtr<nsIXULWindow> xulWin(do_GetInterface(baseWindow));
+  Focus(currentWindow, currentFocus, 0, true, false, xulWin != nullptr, true);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::WindowLowered(mozIDOMWindowProxy* aWindow)
+{
+  NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
+  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
+
+  if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
+    LOGFOCUS(("Window %p Lowered [Currently: %p %p]", aWindow, mActiveWindow.get(), mFocusedWindow.get()));
+    nsIDocument* doc = window->GetExtantDoc();
+    if (doc && doc->GetDocumentURI()) {
+      LOGFOCUS(("  Lowered Window: %s",
+                doc->GetDocumentURI()->GetSpecOrDefault().get()));
+    }
+    if (mActiveWindow) {
+      doc = mActiveWindow->GetExtantDoc();
+      if (doc && doc->GetDocumentURI()) {
+        LOGFOCUS(("  Active Window: %s",
+                  doc->GetDocumentURI()->GetSpecOrDefault().get()));
+      }
+    }
+  }
+
+  if (mActiveWindow != window)
+    return NS_OK;
+
+  // clear the mouse capture as the active window has changed
+  nsIPresShell::SetCapturingContent(nullptr, 0);
+
+  // In addition, reset the drag state to ensure that we are no longer in
+  // drag-select mode.
+  if (mFocusedWindow) {
+    nsCOMPtr<nsIDocShell> docShell = mFocusedWindow->GetDocShell();
+    if (docShell) {
+      nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
+      if (presShell) {
+        RefPtr<nsFrameSelection> frameSelection = presShell->FrameSelection();
+        frameSelection->SetDragState(false);
+      }
+    }
+  }
+
+  // If this is a parent or single process window, send the deactivate event.
+  // Events for child process windows will be sent when ParentActivated
+  // is called.
+  if (XRE_IsParentProcess()) {
+    ActivateOrDeactivate(window, false);
+  }
+
+  // keep track of the window being lowered, so that attempts to raise the
+  // window can be prevented until we return. Otherwise, focus can get into
+  // an unusual state.
+  mWindowBeingLowered = mActiveWindow;
+  mActiveWindow = nullptr;
+
+  if (mFocusedWindow)
+    Blur(nullptr, nullptr, true, true);
+
+  mWindowBeingLowered = nullptr;
+
+  return NS_OK;
+}
+
+nsresult
+nsFocusManager::ContentRemoved(nsIDocument* aDocument, nsIContent* aContent)
+{
+  NS_ENSURE_ARG(aDocument);
+  NS_ENSURE_ARG(aContent);
+
+  nsPIDOMWindowOuter *window = aDocument->GetWindow();
+  if (!window)
+    return NS_OK;
+
+  // if the content is currently focused in the window, or is an ancestor
+  // of the currently focused element, reset the focus within that window.
+  nsIContent* content = window->GetFocusedNode();
+  if (content && nsContentUtils::ContentIsDescendantOf(content, aContent)) {
+    bool shouldShowFocusRing = window->ShouldShowFocusRing();
+    window->SetFocusedNode(nullptr);
+
+    // if this window is currently focused, clear the global focused
+    // element as well, but don't fire any events.
+    if (window == mFocusedWindow) {
+      mFocusedContent = nullptr;
+    } else {
+      // Check if the node that was focused is an iframe or similar by looking
+      // if it has a subdocument. This would indicate that this focused iframe
+      // and its descendants will be going away. We will need to move the
+      // focus somewhere else, so just clear the focus in the toplevel window
+      // so that no element is focused.
+      nsIDocument* subdoc = aDocument->GetSubDocumentFor(content);
+      if (subdoc) {
+        nsCOMPtr<nsIDocShell> docShell = subdoc->GetDocShell();
+        if (docShell) {
+          nsCOMPtr<nsPIDOMWindowOuter> childWindow = docShell->GetWindow();
+          if (childWindow && IsSameOrAncestor(childWindow, mFocusedWindow)) {
+            ClearFocus(mActiveWindow);
+          }
+        }
+      }
+    }
+
+    // Notify the editor in case we removed its ancestor limiter.
+    if (content->IsEditable()) {
+      nsCOMPtr<nsIDocShell> docShell = aDocument->GetDocShell();
+      if (docShell) {
+        nsCOMPtr<nsIEditor> editor;
+        docShell->GetEditor(getter_AddRefs(editor));
+        if (editor) {
+          nsCOMPtr<nsISelection> s;
+          editor->GetSelection(getter_AddRefs(s));
+          nsCOMPtr<nsISelectionPrivate> selection = do_QueryInterface(s);
+          if (selection) {
+            nsCOMPtr<nsIContent> limiter;
+            selection->GetAncestorLimiter(getter_AddRefs(limiter));
+            if (limiter == content) {
+              editor->FinalizeSelection();
+            }
+          }
+        }
+      }
+    }
+
+    NotifyFocusStateChange(content, shouldShowFocusRing, false);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::WindowShown(mozIDOMWindowProxy* aWindow, bool aNeedsFocus)
+{
+  NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
+  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
+
+  if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
+    LOGFOCUS(("Window %p Shown [Currently: %p %p]", window.get(), mActiveWindow.get(), mFocusedWindow.get()));
+    nsIDocument* doc = window->GetExtantDoc();
+    if (doc && doc->GetDocumentURI()) {
+      LOGFOCUS(("Shown Window: %s",
+                doc->GetDocumentURI()->GetSpecOrDefault().get()));
+    }
+
+    if (mFocusedWindow) {
+      doc = mFocusedWindow->GetExtantDoc();
+      if (doc && doc->GetDocumentURI()) {
+        LOGFOCUS((" Focused Window: %s",
+                  doc->GetDocumentURI()->GetSpecOrDefault().get()));
+      }
+    }
+  }
+
+  if (nsIDocShell* docShell = window->GetDocShell()) {
+    if (nsCOMPtr<nsITabChild> child = docShell->GetTabChild()) {
+      bool active = static_cast<TabChild*>(child.get())->ParentIsActive();
+      ActivateOrDeactivate(window, active);
+    }
+  }
+
+  if (mFocusedWindow != window)
+    return NS_OK;
+
+  if (aNeedsFocus) {
+    nsCOMPtr<nsPIDOMWindowOuter> currentWindow;
+    nsCOMPtr<nsIContent> currentFocus =
+      GetFocusedDescendant(window, true, getter_AddRefs(currentWindow));
+    if (currentWindow)
+      Focus(currentWindow, currentFocus, 0, true, false, false, true);
+  }
+  else {
+    // Sometimes, an element in a window can be focused before the window is
+    // visible, which would mean that the widget may not be properly focused.
+    // When the window becomes visible, make sure the right widget is focused.
+    EnsureCurrentWidgetFocused();
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::WindowHidden(mozIDOMWindowProxy* aWindow)
+{
+  // if there is no window or it is not the same or an ancestor of the
+  // currently focused window, just return, as the current focus will not
+  // be affected.
+
+  NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
+  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
+
+  if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
+    LOGFOCUS(("Window %p Hidden [Currently: %p %p]", window.get(), mActiveWindow.get(), mFocusedWindow.get()));
+    nsAutoCString spec;
+    nsIDocument* doc = window->GetExtantDoc();
+    if (doc && doc->GetDocumentURI()) {
+      LOGFOCUS(("  Hide Window: %s",
+                doc->GetDocumentURI()->GetSpecOrDefault().get()));
+    }
+
+    if (mFocusedWindow) {
+      doc = mFocusedWindow->GetExtantDoc();
+      if (doc && doc->GetDocumentURI()) {
+        LOGFOCUS(("  Focused Window: %s",
+                  doc->GetDocumentURI()->GetSpecOrDefault().get()));
+      }
+    }
+
+    if (mActiveWindow) {
+      doc = mActiveWindow->GetExtantDoc();
+      if (doc && doc->GetDocumentURI()) {
+        LOGFOCUS(("  Active Window: %s",
+                  doc->GetDocumentURI()->GetSpecOrDefault().get()));
+      }
+    }
+  }
+
+  if (!IsSameOrAncestor(window, mFocusedWindow))
+    return NS_OK;
+
+  // at this point, we know that the window being hidden is either the focused
+  // window, or an ancestor of the focused window. Either way, the focus is no
+  // longer valid, so it needs to be updated.
+
+  nsCOMPtr<nsIContent> oldFocusedContent = mFocusedContent.forget();
+
+  nsCOMPtr<nsIDocShell> focusedDocShell = mFocusedWindow->GetDocShell();
+  nsCOMPtr<nsIPresShell> presShell = focusedDocShell->GetPresShell();
+
+  if (oldFocusedContent && oldFocusedContent->IsInComposedDoc()) {
+    NotifyFocusStateChange(oldFocusedContent,
+                           mFocusedWindow->ShouldShowFocusRing(),
+                           false);
+    window->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
+
+    if (presShell) {
+      SendFocusOrBlurEvent(eBlur, presShell,
+                           oldFocusedContent->GetComposedDoc(),
+                           oldFocusedContent, 1, false);
+    }
+  }
+
+  nsPresContext* focusedPresContext =
+    presShell ? presShell->GetPresContext() : nullptr;
+  IMEStateManager::OnChangeFocus(focusedPresContext, nullptr,
+                                 GetFocusMoveActionCause(0));
+  if (presShell) {
+    SetCaretVisible(presShell, false, nullptr);
+  }
+
+  // if the docshell being hidden is being destroyed, then we want to move
+  // focus somewhere else. Call ClearFocus on the toplevel window, which
+  // will have the effect of clearing the focus and moving the focused window
+  // to the toplevel window. But if the window isn't being destroyed, we are
+  // likely just loading a new document in it, so we want to maintain the
+  // focused window so that the new document gets properly focused.
+  nsCOMPtr<nsIDocShell> docShellBeingHidden = window->GetDocShell();
+  bool beingDestroyed = !docShellBeingHidden;
+  if (docShellBeingHidden) {
+    docShellBeingHidden->IsBeingDestroyed(&beingDestroyed);
+  }
+  if (beingDestroyed) {
+    // There is usually no need to do anything if a toplevel window is going
+    // away, as we assume that WindowLowered will be called. However, this may
+    // not happen if nsIAppStartup::eForceQuit is used to quit, and can cause
+    // a leak. So if the active window is being destroyed, call WindowLowered
+    // directly.
+    NS_ASSERTION(mFocusedWindow->IsOuterWindow(), "outer window expected");
+    if (mActiveWindow == mFocusedWindow || mActiveWindow == window)
+      WindowLowered(mActiveWindow);
+    else
+      ClearFocus(mActiveWindow);
+    return NS_OK;
+  }
+
+  // if the window being hidden is an ancestor of the focused window, adjust
+  // the focused window so that it points to the one being hidden. This
+  // ensures that the focused window isn't in a chain of frames that doesn't
+  // exist any more.
+  if (window != mFocusedWindow) {
+    nsCOMPtr<nsIDocShellTreeItem> dsti =
+      mFocusedWindow ? mFocusedWindow->GetDocShell() : nullptr;
+    if (dsti) {
+      nsCOMPtr<nsIDocShellTreeItem> parentDsti;
+      dsti->GetParent(getter_AddRefs(parentDsti));
+      if (parentDsti) {
+        if (nsCOMPtr<nsPIDOMWindowOuter> parentWindow = parentDsti->GetWindow())
+          parentWindow->SetFocusedNode(nullptr);
+      }
+    }
+
+    SetFocusedWindowInternal(window);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::FireDelayedEvents(nsIDocument* aDocument)
+{
+  NS_ENSURE_ARG(aDocument);
+
+  // fire any delayed focus and blur events in the same order that they were added
+  for (uint32_t i = 0; i < mDelayedBlurFocusEvents.Length(); i++) {
+    if (mDelayedBlurFocusEvents[i].mDocument == aDocument) {
+      if (!aDocument->GetInnerWindow() ||
+          !aDocument->GetInnerWindow()->IsCurrentInnerWindow()) {
+        // If the document was navigated away from or is defunct, don't bother
+        // firing events on it. Note the symmetry between this condition and
+        // the similar one in nsDocument.cpp:FireOrClearDelayedEvents.
+        mDelayedBlurFocusEvents.RemoveElementAt(i);
+        --i;
+      } else if (!aDocument->EventHandlingSuppressed()) {
+        EventMessage message = mDelayedBlurFocusEvents[i].mEventMessage;
+        nsCOMPtr<EventTarget> target = mDelayedBlurFocusEvents[i].mTarget;
+        nsCOMPtr<nsIPresShell> presShell = mDelayedBlurFocusEvents[i].mPresShell;
+        nsCOMPtr<EventTarget> relatedTarget = mDelayedBlurFocusEvents[i].mRelatedTarget;
+        mDelayedBlurFocusEvents.RemoveElementAt(i);
+        SendFocusOrBlurEvent(message, presShell, aDocument, target, 0,
+                             false, false, relatedTarget);
+        --i;
+      }
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::FocusPlugin(nsIContent* aContent)
+{
+  NS_ENSURE_ARG(aContent);
+  SetFocusInner(aContent, 0, true, false);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFocusManager::ParentActivated(mozIDOMWindowProxy* aWindow, bool aActive)
+{
+  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
+  NS_ENSURE_TRUE(window, NS_ERROR_INVALID_ARG);
+
+  ActivateOrDeactivate(window, aActive);
+  return NS_OK;
+}
+
+/* static */
+void
+nsFocusManager::NotifyFocusStateChange(nsIContent* aContent,
+                                       bool aWindowShouldShowFocusRing,
+                                       bool aGettingFocus)
+{
+  if (!aContent->IsElement()) {
+    return;
+  }
+  EventStates eventState = NS_EVENT_STATE_FOCUS;
+  if (aWindowShouldShowFocusRing) {
+    eventState |= NS_EVENT_STATE_FOCUSRING;
+  }
+
+  if (aGettingFocus) {
+    aContent->AsElement()->AddStates(eventState);
+  } else {
+    aContent->AsElement()->RemoveStates(eventState);
+  }
+
+  for (Element* element = aContent->AsElement(); element;
+       element = element->GetParentElementCrossingShadowRoot()) {
+    if (aGettingFocus) {
+      element->AddStates(NS_EVENT_STATE_FOCUS_WITHIN);
+    } else {
+      element->RemoveStates(NS_EVENT_STATE_FOCUS_WITHIN);
+    }
+  }
+}
+
+// static
+void
+nsFocusManager::EnsureCurrentWidgetFocused()
+{
+  if (!mFocusedWindow || sTestMode)
+    return;
+
+  // get the main child widget for the focused window and ensure that the
+  // platform knows that this widget is focused.
+  nsCOMPtr<nsIDocShell> docShell = mFocusedWindow->GetDocShell();
+  if (docShell) {
+    nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
+    if (presShell) {
+      nsViewManager* vm = presShell->GetViewManager();
+      if (vm) {
+        nsCOMPtr<nsIWidget> widget;
+        vm->GetRootWidget(getter_AddRefs(widget));
+        if (widget)
+          widget->SetFocus(false);
+      }
+    }
+  }
+}
+
+bool
+ActivateOrDeactivateChild(TabParent* aParent, void* aArg)
+{
+  bool active = static_cast<bool>(aArg);
+  Unused << aParent->SendParentActivated(active);
+  return false;
+}
+
+void
+nsFocusManager::ActivateOrDeactivate(nsPIDOMWindowOuter* aWindow, bool aActive)
+{
+  if (!aWindow) {
+    return;
+  }
+
+  // Inform the DOM window that it has activated or deactivated, so that
+  // the active attribute is updated on the window.
+  aWindow->ActivateOrDeactivate(aActive);
+
+  // Send the activate event.
+  if (aWindow->GetExtantDoc()) {
+    nsContentUtils::DispatchEventOnlyToChrome(aWindow->GetExtantDoc(),
+                                              aWindow->GetCurrentInnerWindow(),
+                                              aActive ?
+                                                NS_LITERAL_STRING("activate") :
+                                                NS_LITERAL_STRING("deactivate"),
+                                              true, true, nullptr);
+  }
+
+  // Look for any remote child frames, iterate over them and send the activation notification.
+  nsContentUtils::CallOnAllRemoteChildren(aWindow, ActivateOrDeactivateChild,
+                                          (void *)aActive);
+}
+
+void
+nsFocusManager::SetFocusInner(nsIContent* aNewContent, int32_t aFlags,
+                              bool aFocusChanged, bool aAdjustWidget)
+{
+  // if the element is not focusable, just return and leave the focus as is
+  nsCOMPtr<nsIContent> contentToFocus = CheckIfFocusable(aNewContent, aFlags);
+  if (!contentToFocus)
+    return;
+
+  // check if the element to focus is a frame (iframe) containing a child
+  // document. Frames are never directly focused; instead focusing a frame
+  // means focus what is inside the frame. To do this, the descendant content
+  // within the frame is retrieved and that will be focused instead.
+  nsCOMPtr<nsPIDOMWindowOuter> newWindow;
+  nsCOMPtr<nsPIDOMWindowOuter> subWindow = GetContentWindow(contentToFocus);
+  if (subWindow) {
+    contentToFocus = GetFocusedDescendant(subWindow, true, getter_AddRefs(newWindow));
+    // since a window is being refocused, clear aFocusChanged so that the
+    // caret position isn't updated.
+    aFocusChanged = false;
+  }
+
+  // unless it was set above, retrieve the window for the element to focus
+  if (!newWindow)
+    newWindow = GetCurrentWindow(contentToFocus);
+
+  // if the element is already focused, just return. Note that this happens
+  // after the frame check above so that we compare the element that will be
+  // focused rather than the frame it is in.
+  if (!newWindow || (newWindow == mFocusedWindow && contentToFocus == mFocusedContent))
+    return;
+
+  // don't allow focus to be placed in docshells or descendants of docshells
+  // that are being destroyed. Also, ensure that the page hasn't been
+  // unloaded. The prevents content from being refocused during an unload event.
+  nsCOMPtr<nsIDocShell> newDocShell = newWindow->GetDocShell();
+  nsCOMPtr<nsIDocShell> docShell = newDocShell;
+  while (docShell) {
+    bool inUnload;
+    docShell->GetIsInUnload(&inUnload);
+    if (inUnload)
+      return;
+
+    bool beingDestroyed;
+    docShell->IsBeingDestroyed(&beingDestroyed);
+    if (beingDestroyed)
+      return;
+
+    nsCOMPtr<nsIDocShellTreeItem> parentDsti;
+    docShell->GetParent(getter_AddRefs(parentDsti));
+    docShell = do_QueryInterface(parentDsti);
+  }
+
+  // if the new element is in the same window as the currently focused element 
+  bool isElementInFocusedWindow = (mFocusedWindow == newWindow);
+
+  if (!isElementInFocusedWindow && mFocusedWindow && newWindow &&
+      nsContentUtils::IsHandlingKeyBoardEvent()) {
+    nsCOMPtr<nsIScriptObjectPrincipal> focused =
+      do_QueryInterface(mFocusedWindow);
+    nsCOMPtr<nsIScriptObjectPrincipal> newFocus =
+      do_QueryInterface(newWindow);
+    nsIPrincipal* focusedPrincipal = focused->GetPrincipal();
+    nsIPrincipal* newPrincipal = newFocus->GetPrincipal();
+    if (!focusedPrincipal || !newPrincipal) {
+      return;
+    }
+    bool subsumes = false;
+    focusedPrincipal->Subsumes(newPrincipal, &subsumes);
+    if (!subsumes && !nsContentUtils::LegacyIsCallerChromeOrNativeCode()) {
+      NS_WARNING("Not allowed to focus the new window!");
+      return;
+    }
+  }
+
+  // to check if the new element is in the active window, compare the
+  // new root docshell for the new element with the active window's docshell.
+  bool isElementInActiveWindow = false;
+
+  nsCOMPtr<nsIDocShellTreeItem> dsti = newWindow->GetDocShell();
+  nsCOMPtr<nsPIDOMWindowOuter> newRootWindow;
+  if (dsti) {
+    nsCOMPtr<nsIDocShellTreeItem> root;
+    dsti->GetRootTreeItem(getter_AddRefs(root));
+    newRootWindow = root ? root->GetWindow() : nullptr;
+
+    isElementInActiveWindow = (mActiveWindow && newRootWindow == mActiveWindow);
+  }
+
+  // Exit fullscreen if we're focusing a windowed plugin on a non-MacOSX
+  // system. We don't control event dispatch to windowed plugins on non-MacOSX,
+  // so we can't display the "Press ESC to leave fullscreen mode" warning on
+  // key input if a windowed plugin is focused, so just exit fullscreen
+  // to guard against phishing.
+#ifndef XP_MACOSX
+  if (contentToFocus &&
+      nsContentUtils::
+        GetRootDocument(contentToFocus->OwnerDoc())->GetFullscreenElement() &&
+      nsContentUtils::HasPluginWithUncontrolledEventDispatch(contentToFocus)) {
+    nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
+                                    NS_LITERAL_CSTRING("DOM"),
+                                    contentToFocus->OwnerDoc(),
+                                    nsContentUtils::eDOM_PROPERTIES,
+                                    "FocusedWindowedPluginWhileFullscreen");
+    nsIDocument::AsyncExitFullscreen(contentToFocus->OwnerDoc());
+  }
+#endif
+
+  // if the FLAG_NOSWITCHFRAME flag is used, only allow the focus to be
+  // shifted away from the current element if the new shell to focus is
+  // the same or an ancestor shell of the currently focused shell.
+  bool allowFrameSwitch = !(aFlags & FLAG_NOSWITCHFRAME) ||
+                            IsSameOrAncestor(newWindow, mFocusedWindow);
+
+  // if the element is in the active window, frame switching is allowed and
+  // the content is in a visible window, fire blur and focus events.
+  bool sendFocusEvent =
+    isElementInActiveWindow && allowFrameSwitch && IsWindowVisible(newWindow);
+
+  // When the following conditions are true:
+  //  * an element has focus
+  //  * isn't called by trusted event (i.e., called by untrusted event or by js)
+  //  * the focus is moved to another document's element
+  // we need to check the permission.
+  if (sendFocusEvent && mFocusedContent && !nsContentUtils::LegacyIsCallerNativeCode() &&
+      mFocusedContent->OwnerDoc() != aNewContent->OwnerDoc()) {
+    // If the caller cannot access the current focused node, the caller should
+    // not be able to steal focus from it. E.g., When the current focused node
+    // is in chrome, any web contents should not be able to steal the focus.
+    nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(mFocusedContent));
+    sendFocusEvent = nsContentUtils::CanCallerAccess(domNode);
+    if (!sendFocusEvent && mMouseButtonEventHandlingDocument) {
+      // However, while mouse button event is handling, the handling document's
+      // script should be able to steal focus.
+      domNode = do_QueryInterface(mMouseButtonEventHandlingDocument);
+      sendFocusEvent = nsContentUtils::CanCallerAccess(domNode);
+    }
+  }
+
+  LOGCONTENT("Shift Focus: %s", contentToFocus.get());
+  LOGFOCUS((" Flags: %x Current Window: %p New Window: %p Current Element: %p",
+           aFlags, mFocusedWindow.get(), newWindow.get(), mFocusedContent.get()));
+  LOGFOCUS((" In Active Window: %d In Focused Window: %d SendFocus: %d",
+           isElementInActiveWindow, isElementInFocusedWindow, sendFocusEvent));
+
+  if (sendFocusEvent) {
+    nsCOMPtr<nsIContent> oldFocusedContent = mFocusedContent;
+    // return if blurring fails or the focus changes during the blur
+    if (mFocusedWindow) {
+      // if the focus is being moved to another element in the same document,
+      // or to a descendant, pass the existing window to Blur so that the
+      // current node in the existing window is cleared. If moving to a
+      // window elsewhere, we want to maintain the current node in the
+      // window but still blur it.
+      bool currentIsSameOrAncestor = IsSameOrAncestor(mFocusedWindow, newWindow);
+      // find the common ancestor of the currently focused window and the new
+      // window. The ancestor will need to have its currently focused node
+      // cleared once the document has been blurred. Otherwise, we'll be in a
+      // state where a document is blurred yet the chain of windows above it
+      // still points to that document.
+      // For instance, in the following frame tree:
+      //   A
+      //  B C
+      //  D
+      // D is focused and we want to focus C. Once D has been blurred, we need
+      // to clear out the focus in A, otherwise A would still maintain that B
+      // was focused, and B that D was focused.
+      nsCOMPtr<nsPIDOMWindowOuter> commonAncestor;
+      if (!isElementInFocusedWindow)
+        commonAncestor = GetCommonAncestor(newWindow, mFocusedWindow);
+
+      if (!Blur(currentIsSameOrAncestor ? mFocusedWindow.get() : nullptr,
+                commonAncestor, !isElementInFocusedWindow, aAdjustWidget,
+                contentToFocus))
+        return;
+    }
+
+    Focus(newWindow, contentToFocus, aFlags, !isElementInFocusedWindow,
+          aFocusChanged, false, aAdjustWidget, oldFocusedContent);
+  }
+  else {
+    // otherwise, for inactive windows and when the caller cannot steal the
+    // focus, update the node in the window, and  raise the window if desired.
+    if (allowFrameSwitch)
+      AdjustWindowFocus(newWindow, true);
+
+    // set the focus node and method as needed
+    uint32_t focusMethod = aFocusChanged ? aFlags & FOCUSMETHODANDRING_MASK :
+                           newWindow->GetFocusMethod() | (aFlags & FLAG_SHOWRING);
+    newWindow->SetFocusedNode(contentToFocus, focusMethod);
+    if (aFocusChanged) {
+      nsCOMPtr<nsIDocShell> docShell = newWindow->GetDocShell();
+
+      nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
+      if (presShell && presShell->DidInitialize())
+        ScrollIntoView(presShell, contentToFocus, aFlags);
+    }
+
+    // update the commands even when inactive so that the attributes for that
+    // window are up to date.
+    if (allowFrameSwitch)
+      newWindow->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
+
+    if (aFlags & FLAG_RAISE)
+      RaiseWindow(newRootWindow);
+  }
+}
+
+bool
+nsFocusManager::IsSameOrAncestor(nsPIDOMWindowOuter* aPossibleAncestor,
+                                 nsPIDOMWindowOuter* aWindow)
+{
+  if (!aWindow || !aPossibleAncestor) {
+    return false;
+  }
+
+  nsCOMPtr<nsIDocShellTreeItem> ancestordsti = aPossibleAncestor->GetDocShell();
+  nsCOMPtr<nsIDocShellTreeItem> dsti = aWindow->GetDocShell();
+  while (dsti) {
+    if (dsti == ancestordsti)
+      return true;
+    nsCOMPtr<nsIDocShellTreeItem> parentDsti;
+    dsti->GetParent(getter_AddRefs(parentDsti));
+    dsti.swap(parentDsti);
+  }
+
+  return false;
+}
+
+already_AddRefed<nsPIDOMWindowOuter>
+nsFocusManager::GetCommonAncestor(nsPIDOMWindowOuter* aWindow1,
+                                  nsPIDOMWindowOuter* aWindow2)
+{
+  NS_ENSURE_TRUE(aWindow1 && aWindow2, nullptr);
+
+  nsCOMPtr<nsIDocShellTreeItem> dsti1 = aWindow1->GetDocShell();
+  NS_ENSURE_TRUE(dsti1, nullptr);
+
+  nsCOMPtr<nsIDocShellTreeItem> dsti2 = aWindow2->GetDocShell();
+  NS_ENSURE_TRUE(dsti2, nullptr);
+
+  AutoTArray<nsIDocShellTreeItem*, 30> parents1, parents2;
+  do {
+    parents1.AppendElement(dsti1);
+    nsCOMPtr<nsIDocShellTreeItem> parentDsti1;
+    dsti1->GetParent(getter_AddRefs(parentDsti1));
+    dsti1.swap(parentDsti1);
+  } while (dsti1);
+  do {
+    parents2.AppendElement(dsti2);
+    nsCOMPtr<nsIDocShellTreeItem> parentDsti2;
+    dsti2->GetParent(getter_AddRefs(parentDsti2));
+    dsti2.swap(parentDsti2);
+  } while (dsti2);
+
+  uint32_t pos1 = parents1.Length();
+  uint32_t pos2 = parents2.Length();
+  nsIDocShellTreeItem* parent = nullptr;
+  uint32_t len;
+  for (len = std::min(pos1, pos2); len > 0; --len) {
+    nsIDocShellTreeItem* child1 = parents1.ElementAt(--pos1);
+    nsIDocShellTreeItem* child2 = parents2.ElementAt(--pos2);
+    if (child1 != child2) {
+      break;
+    }
+    parent = child1;
+  }
+
+  nsCOMPtr<nsPIDOMWindowOuter> window = parent ? parent->GetWindow() : nullptr;
+  return window.forget();
+}
+
+void
+nsFocusManager::AdjustWindowFocus(nsPIDOMWindowOuter* aWindow,
+                                  bool aCheckPermission)
+{
+  bool isVisible = IsWindowVisible(aWindow);
+
+  nsCOMPtr<nsPIDOMWindowOuter> window(aWindow);
+  while (window) {
+    // get the containing <iframe> or equivalent element so that it can be
+    // focused below.
+    nsCOMPtr<Element> frameElement = window->GetFrameElementInternal();
+
+    nsCOMPtr<nsIDocShellTreeItem> dsti = window->GetDocShell();
+    if (!dsti) 
+      return;
+    nsCOMPtr<nsIDocShellTreeItem> parentDsti;
+    dsti->GetParent(getter_AddRefs(parentDsti));
+    if (!parentDsti) {
+      return;
+    }
+
+    window = parentDsti->GetWindow();
+    if (window) {
+      // if the parent window is visible but aWindow was not, then we have
+      // likely moved up and out from a hidden tab to the browser window, or a
+      // similar such arrangement. Stop adjusting the current nodes.
+      if (IsWindowVisible(window) != isVisible)
+        break;
+
+      // When aCheckPermission is true, we should check whether the caller can
+      // access the window or not.  If it cannot access, we should stop the
+      // adjusting.
+      if (aCheckPermission && !nsContentUtils::LegacyIsCallerNativeCode() &&
+          !nsContentUtils::CanCallerAccess(window->GetCurrentInnerWindow())) {
+        break;
+      }
+
+      window->SetFocusedNode(frameElement);
+    }
+  }
+}
+
+bool
+nsFocusManager::IsWindowVisible(nsPIDOMWindowOuter* aWindow)
+{
+  if (!aWindow || aWindow->IsFrozen())
+    return false;
+
+  // Check if the inner window is frozen as well. This can happen when a focus change
+  // occurs while restoring a previous page.
+  nsPIDOMWindowInner* innerWindow = aWindow->GetCurrentInnerWindow();
+  if (!innerWindow || innerWindow->IsFrozen())
+    return false;
+
+  nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
+  nsCOMPtr<nsIBaseWindow> baseWin(do_QueryInterface(docShell));
+  if (!baseWin)
+    return false;
+
+  bool visible = false;
+  baseWin->GetVisibility(&visible);
+  return visible;
+}
+
+bool
+nsFocusManager::IsNonFocusableRoot(nsIContent* aContent)
+{
+  NS_PRECONDITION(aContent, "aContent must not be NULL");
+  NS_PRECONDITION(aContent->IsInComposedDoc(), "aContent must be in a document");
+
+  // If aContent is in designMode, the root element is not focusable.
+  // NOTE: in designMode, most elements are not focusable, just the document is
+  //       focusable.
+  // Also, if aContent is not editable but it isn't in designMode, it's not
+  // focusable.
+  // And in userfocusignored context nothing is focusable.
+  nsIDocument* doc = aContent->GetComposedDoc();
+  NS_ASSERTION(doc, "aContent must have current document");
+  return aContent == doc->GetRootElement() &&
+           (doc->HasFlag(NODE_IS_EDITABLE) || !aContent->IsEditable() ||
+            nsContentUtils::IsUserFocusIgnored(aContent));
+}
+
+nsIContent*
+nsFocusManager::CheckIfFocusable(nsIContent* aContent, uint32_t aFlags)
+{
+  if (!aContent)
+    return nullptr;
+
+  // this is a special case for some XUL elements or input number, where an
+  // anonymous child is actually focusable and not the element itself.
+  nsCOMPtr<nsIContent> redirectedFocus = GetRedirectedFocus(aContent);
+  if (redirectedFocus)
+    return CheckIfFocusable(redirectedFocus, aFlags);
+
+  nsCOMPtr<nsIDocument> doc = aContent->GetComposedDoc();
+  // can't focus elements that are not in documents
+  if (!doc) {
+    LOGCONTENT("Cannot focus %s because content not in document", aContent)
+    return nullptr;
+  }
+
+  // Make sure that our frames are up to date
+  doc->FlushPendingNotifications(Flush_Layout);
+
+  nsIPresShell *shell = doc->GetShell();
+  if (!shell)
+    return nullptr;
+
+  // the root content can always be focused,
+  // except in userfocusignored context.
+  if (aContent == doc->GetRootElement())
+    return nsContentUtils::IsUserFocusIgnored(aContent) ? nullptr : aContent;
+
+  // cannot focus content in print preview mode. Only the root can be focused.
+  nsPresContext* presContext = shell->GetPresContext();
+  if (presContext && presContext->Type() == nsPresContext::eContext_PrintPreview) {
+    LOGCONTENT("Cannot focus %s while in print preview", aContent)
+    return nullptr;
+  }
+
+  nsIFrame* frame = aContent->GetPrimaryFrame();
+  if (!frame) {
+    LOGCONTENT("Cannot focus %s as it has no frame", aContent)
+    return nullptr;
+  }
+
+  if (aContent->IsHTMLElement(nsGkAtoms::area)) {
+    // HTML areas do not have their own frame, and the img frame we get from
+    // GetPrimaryFrame() is not relevant as to whether it is focusable or
+    // not, so we have to do all the relevant checks manually for them.
+    return frame->IsVisibleConsideringAncestors() &&
+           aContent->IsFocusable() ? aContent : nullptr;
+  }
+
+  // if this is a child frame content node, check if it is visible and
+  // call the content node's IsFocusable method instead of the frame's
+  // IsFocusable method. This skips checking the style system and ensures that
+  // offscreen browsers can still be focused.
+  nsIDocument* subdoc = doc->GetSubDocumentFor(aContent);
+  if (subdoc && IsWindowVisible(subdoc->GetWindow())) {
+    const nsStyleUserInterface* ui = frame->StyleUserInterface();
+    int32_t tabIndex = (ui->mUserFocus == StyleUserFocus::Ignore ||
+                        ui->mUserFocus == StyleUserFocus::None) ? -1 : 0;
+    return aContent->IsFocusable(&tabIndex, aFlags & FLAG_BYMOUSE) ? aContent : nullptr;
+  }
+  
+  return frame->IsFocusable(nullptr, aFlags & FLAG_BYMOUSE) ? aContent : nullptr;
+}
+
+bool
+nsFocusManager::Blur(nsPIDOMWindowOuter* aWindowToClear,
+                     nsPIDOMWindowOuter* aAncestorWindowToFocus,
+                     bool aIsLeavingDocument,
+                     bool aAdjustWidgets,
+                     nsIContent* aContentToFocus)
+{
+  LOGFOCUS(("<<Blur begin>>"));
+
+  // hold a reference to the focused content, which may be null
+  nsCOMPtr<nsIContent> content = mFocusedContent;
+  if (content) {
+    if (!content->IsInComposedDoc()) {
+      mFocusedContent = nullptr;
+      return true;
+    }
+    if (content == mFirstBlurEvent)
+      return true;
+  }
+
+  // hold a reference to the focused window
+  nsCOMPtr<nsPIDOMWindowOuter> window = mFocusedWindow;
+  if (!window) {
+    mFocusedContent = nullptr;
+    return true;
+  }
+
+  nsCOMPtr<nsIDocShell> docShell = window->GetDocShell();
+  if (!docShell) {
+    mFocusedContent = nullptr;
+    return true;
+  }
+
+  // Keep a ref to presShell since dispatching the DOM event may cause
+  // the document to be destroyed.
+  nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
+  if (!presShell) {
+    mFocusedContent = nullptr;
+    return true;
+  }
+
+  bool clearFirstBlurEvent = false;
+  if (!mFirstBlurEvent) {
+    mFirstBlurEvent = content;
+    clearFirstBlurEvent = true;
+  }
+
+  nsPresContext* focusedPresContext =
+    mActiveWindow ? presShell->GetPresContext() : nullptr;
+  IMEStateManager::OnChangeFocus(focusedPresContext, nullptr,
+                                 GetFocusMoveActionCause(0));
+
+  // now adjust the actual focus, by clearing the fields in the focus manager
+  // and in the window.
+  mFocusedContent = nullptr;
+  bool shouldShowFocusRing = window->ShouldShowFocusRing();
+  if (aWindowToClear)
+    aWindowToClear->SetFocusedNode(nullptr);
+
+  LOGCONTENT("Element %s has been blurred", content.get());
+
+  // Don't fire blur event on the root content which isn't editable.
+  bool sendBlurEvent =
+    content && content->IsInComposedDoc() && !IsNonFocusableRoot(content);
+  if (content) {
+    if (sendBlurEvent) {
+      NotifyFocusStateChange(content, shouldShowFocusRing, false);
+    }
+
+    // if an object/plug-in/remote browser is being blurred, move the system focus
+    // to the parent window, otherwise events will still get fired at the plugin.
+    // But don't do this if we are blurring due to the window being lowered,
+    // otherwise, the parent window can get raised again.
+    if (mActiveWindow) {
+      nsIFrame* contentFrame = content->GetPrimaryFrame();
+      nsIObjectFrame* objectFrame = do_QueryFrame(contentFrame);
+      if (aAdjustWidgets && objectFrame && !sTestMode) {
+        if (XRE_IsContentProcess()) {
+          // set focus to the top level window via the chrome process.
+          nsCOMPtr<nsITabChild> tabChild = docShell->GetTabChild();
+          if (tabChild) {
+            static_cast<TabChild*>(tabChild.get())->SendDispatchFocusToTopLevelWindow();
+          }
+        } else {
+          // note that the presshell's widget is being retrieved here, not the one
+          // for the object frame.
+          nsViewManager* vm = presShell->GetViewManager();
+          if (vm) {
+            nsCOMPtr<nsIWidget> widget;
+            vm->GetRootWidget(getter_AddRefs(widget));
+            if (widget) {
+              // set focus to the top level window but don't raise it.
+              widget->SetFocus(false);
+            }
+          }
+        }
+      }
+    }
+
+      // if the object being blurred is a remote browser, deactivate remote content
+    if (TabParent* remote = TabParent::GetFrom(content)) {
+      remote->Deactivate();
+      LOGFOCUS(("Remote browser deactivated"));
+    }
+  }
+
+  bool result = true;
+  if (sendBlurEvent) {
+    // if there is an active window, update commands. If there isn't an active
+    // window, then this was a blur caused by the active window being lowered,
+    // so there is no need to update the commands
+    if (mActiveWindow)
+      window->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
+
+    SendFocusOrBlurEvent(eBlur, presShell,
+                         content->GetComposedDoc(), content, 1,
+                         false, false, aContentToFocus);
+  }
+
+  // if we are leaving the document or the window was lowered, make the caret
+  // invisible.
+  if (aIsLeavingDocument || !mActiveWindow) {
+    SetCaretVisible(presShell, false, nullptr);
+  }
+
+  RefPtr<AccessibleCaretEventHub> eventHub = presShell->GetAccessibleCaretEventHub();
+  if (eventHub) {
+    eventHub->NotifyBlur(aIsLeavingDocument || !mActiveWindow);
+  }
+
+  // at this point, it is expected that this window will be still be
+  // focused, but the focused content will be null, as it was cleared before
+  // the event. If this isn't the case, then something else was focused during
+  // the blur event above and we should just return. However, if
+  // aIsLeavingDocument is set, a new document is desired, so make sure to
+  // blur the document and window.
+  if (mFocusedWindow != window ||
+      (mFocusedContent != nullptr && !aIsLeavingDocument)) {
+    result = false;
+  }
+  else if (aIsLeavingDocument) {
+    window->TakeFocus(false, 0);
+
+    // clear the focus so that the ancestor frame hierarchy is in the correct
+    // state. Pass true because aAncestorWindowToFocus is thought to be
+    // focused at this point.
+    if (aAncestorWindowToFocus)
+      aAncestorWindowToFocus->SetFocusedNode(nullptr, 0, true);
+
+    SetFocusedWindowInternal(nullptr);
+    mFocusedContent = nullptr;
+
+    // pass 1 for the focus method when calling SendFocusOrBlurEvent just so
+    // that the check is made for suppressed documents. Check to ensure that
+    // the document isn't null in case someone closed it during the blur above
+    nsIDocument* doc = window->GetExtantDoc();
+    if (doc)
+      SendFocusOrBlurEvent(eBlur, presShell, doc, doc, 1, false);
+    if (mFocusedWindow == nullptr)
+      SendFocusOrBlurEvent(eBlur, presShell, doc,
+                           window->GetCurrentInnerWindow(), 1, false);
+
+    // check if a different window was focused
+    result = (mFocusedWindow == nullptr && mActiveWindow);
+  }
+  else if (mActiveWindow) {
+    // Otherwise, the blur of the element without blurring the document
+    // occurred normally. Call UpdateCaret to redisplay the caret at the right
+    // location within the document. This is needed to ensure that the caret
+    // used for caret browsing is made visible again when an input field is
+    // blurred.
+    UpdateCaret(false, true, nullptr);
+  }
+
+  if (clearFirstBlurEvent)
+    mFirstBlurEvent = nullptr;
+
+  return result;
+}
+
+void
+nsFocusManager::Focus(nsPIDOMWindowOuter* aWindow,
+                      nsIContent* aContent,
+                      uint32_t aFlags,
+                      bool aIsNewDocument,
+                      bool aFocusChanged,
+                      bool aWindowRaised,
+                      bool aAdjustWidgets,
+                      nsIContent* aContentLostFocus)
+{
+  LOGFOCUS(("<<Focus begin>>"));
+
+  if (!aWindow)
+    return;
+
+  if (aContent && (aContent == mFirstFocusEvent || aContent == mFirstBlurEvent))
+    return;
+
+  // Keep a reference to the presShell since dispatching the DOM event may
+  // cause the document to be destroyed.
+  nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
+  if (!docShell)
+    return;
+
+  nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
+  if (!presShell)
+    return;
+
+  // If the focus actually changed, set the focus method (mouse, keyboard, etc).
+  // Otherwise, just get the current focus method and use that. This ensures
+  // that the method is set during the document and window focus events.
+  uint32_t focusMethod = aFocusChanged ? aFlags & FOCUSMETHODANDRING_MASK :
+                         aWindow->GetFocusMethod() | (aFlags & FLAG_SHOWRING);
+
+  if (!IsWindowVisible(aWindow)) {
+    // if the window isn't visible, for instance because it is a hidden tab,
+    // update the current focus and scroll it into view but don't do anything else
+    if (CheckIfFocusable(aContent, aFlags)) {
+      aWindow->SetFocusedNode(aContent, focusMethod);
+      if (aFocusChanged)
+        ScrollIntoView(presShell, aContent, aFlags);
+    }
+    return;
+  }
+
+  bool clearFirstFocusEvent = false;
+  if (!mFirstFocusEvent) {
+    mFirstFocusEvent = aContent;
+    clearFirstFocusEvent = true;
+  }
+
+  LOGCONTENT("Element %s has been focused", aContent);
+
+  if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
+    nsIDocument* docm = aWindow->GetExtantDoc();
+    if (docm) {
+      LOGCONTENT(" from %s", docm->GetRootElement());
+    }
+    LOGFOCUS((" [Newdoc: %d FocusChanged: %d Raised: %d Flags: %x]",
+             aIsNewDocument, aFocusChanged, aWindowRaised, aFlags));
+  }
+
+  if (aIsNewDocument) {
+    // if this is a new document, update the parent chain of frames so that
+    // focus can be traversed from the top level down to the newly focused
+    // window.
+    AdjustWindowFocus(aWindow, false);
+  }
+
+  // indicate that the window has taken focus.
+  if (aWindow->TakeFocus(true, focusMethod))
+    aIsNewDocument = true;
+
+  SetFocusedWindowInternal(aWindow);
+
+  // Update the system focus by focusing the root widget.  But avoid this
+  // if 1) aAdjustWidgets is false or 2) aContent is a plugin that has its
+  // own widget and is either already focused or is about to be focused.
+  nsCOMPtr<nsIWidget> objectFrameWidget;
+  if (aContent) {
+    nsIFrame* contentFrame = aContent->GetPrimaryFrame();
+    nsIObjectFrame* objectFrame = do_QueryFrame(contentFrame);
+    if (objectFrame)
+      objectFrameWidget = objectFrame->GetWidget();
+  }
+  if (aAdjustWidgets && !objectFrameWidget && !sTestMode) {
+    nsViewManager* vm = presShell->GetViewManager();
+    if (vm) {
+      nsCOMPtr<nsIWidget> widget;
+      vm->GetRootWidget(getter_AddRefs(widget));
+      if (widget)
+        widget->SetFocus(false);
+    }
+  }
+
+  // if switching to a new document, first fire the focus event on the
+  // document and then the window.
+  if (aIsNewDocument) {
+    nsIDocument* doc = aWindow->GetExtantDoc();
+    // The focus change should be notified to IMEStateManager from here if
+    // the focused content is a designMode editor since any content won't
+    // receive focus event.
+    if (doc && doc->HasFlag(NODE_IS_EDITABLE)) {
+      IMEStateManager::OnChangeFocus(presShell->GetPresContext(), nullptr,
+                                     GetFocusMoveActionCause(aFlags));
+    }
+    if (doc)
+      SendFocusOrBlurEvent(eFocus, presShell, doc,
+                           doc, aFlags & FOCUSMETHOD_MASK, aWindowRaised);
+    if (mFocusedWindow == aWindow && mFocusedContent == nullptr)
+      SendFocusOrBlurEvent(eFocus, presShell, doc,
+                           aWindow->GetCurrentInnerWindow(),
+                           aFlags & FOCUSMETHOD_MASK, aWindowRaised);
+  }
+
+  // check to ensure that the element is still focusable, and that nothing
+  // else was focused during the events above.
+  if (CheckIfFocusable(aContent, aFlags) &&
+      mFocusedWindow == aWindow && mFocusedContent == nullptr) {
+    mFocusedContent = aContent;
+
+    nsIContent* focusedNode = aWindow->GetFocusedNode();
+    bool isRefocus = focusedNode && focusedNode->IsEqualNode(aContent);
+
+    aWindow->SetFocusedNode(aContent, focusMethod);
+
+    bool sendFocusEvent =
+      aContent && aContent->IsInComposedDoc() && !IsNonFocusableRoot(aContent);
+    nsPresContext* presContext = presShell->GetPresContext();
+    if (sendFocusEvent) {
+      // if the focused element changed, scroll it into view
+      if (aFocusChanged)
+        ScrollIntoView(presShell, aContent, aFlags);
+
+      NotifyFocusStateChange(aContent, aWindow->ShouldShowFocusRing(), true);
+
+      // if this is an object/plug-in/remote browser, focus its widget.  Note that we might
+      // no longer be in the same document, due to the events we fired above when
+      // aIsNewDocument.
+      if (presShell->GetDocument() == aContent->GetComposedDoc()) {
+        if (aAdjustWidgets && objectFrameWidget && !sTestMode)
+          objectFrameWidget->SetFocus(false);
+
+        // if the object being focused is a remote browser, activate remote content
+        if (TabParent* remote = TabParent::GetFrom(aContent)) {
+          remote->Activate();
+          LOGFOCUS(("Remote browser activated"));
+        }
+      }
+
+      IMEStateManager::OnChangeFocus(presContext, aContent,
+                                     GetFocusMoveActionCause(aFlags));
+
+      // as long as this focus wasn't because a window was raised, update the
+      // commands
+      // XXXndeakin P2 someone could adjust the focus during the update
+      if (!aWindowRaised)
+        aWindow->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
+
+      SendFocusOrBlurEvent(eFocus, presShell,
+                           aContent->GetComposedDoc(),
+                           aContent, aFlags & FOCUSMETHOD_MASK,
+                           aWindowRaised, isRefocus, aContentLostFocus);
+    } else {
+      IMEStateManager::OnChangeFocus(presContext, nullptr,
+                                     GetFocusMoveActionCause(aFlags));
+      if (!aWindowRaised) {
+        aWindow->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
+      }
+    }
+  }
+  else {
+    // If the window focus event (fired above when aIsNewDocument) caused
+    // the plugin not to be focusable, update the system focus by focusing
+    // the root widget.
+    if (aAdjustWidgets && objectFrameWidget &&
+        mFocusedWindow == aWindow && mFocusedContent == nullptr &&
+        !sTestMode) {
+      nsViewManager* vm = presShell->GetViewManager();
+      if (vm) {
+        nsCOMPtr<nsIWidget> widget;
+        vm->GetRootWidget(getter_AddRefs(widget));
+        if (widget)
+          widget->SetFocus(false);
+      }
+    }
+
+    if (!mFocusedContent) {
+      // When there is no focused content, IMEStateManager needs to adjust IME
+      // enabled state with the document.
+      nsPresContext* presContext = presShell->GetPresContext();
+      IMEStateManager::OnChangeFocus(presContext, nullptr,
+                                     GetFocusMoveActionCause(aFlags));
+    }
+
+    if (!aWindowRaised)
+      aWindow->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
+  }
+
+  // update the caret visibility and position to match the newly focused
+  // element. However, don't update the position if this was a focus due to a
+  // mouse click as the selection code would already have moved the caret as
+  // needed. If this is a different document than was focused before, also
+  // update the caret's visibility. If this is the same document, the caret
+  // visibility should be the same as before so there is no need to update it.
+  if (mFocusedContent == aContent)
+    UpdateCaret(aFocusChanged && !(aFlags & FLAG_BYMOUSE), aIsNewDocument,
+                mFocusedContent);
+
+  if (clearFirstFocusEvent)
+    mFirstFocusEvent = nullptr;
+}
+
+class FocusBlurEvent : public Runnable
+{
+public:
+  FocusBlurEvent(nsISupports* aTarget, EventMessage aEventMessage,
+                 nsPresContext* aContext, bool aWindowRaised,
+                 bool aIsRefocus, EventTarget* aRelatedTarget)
+    : mTarget(aTarget)
+    , mContext(aContext)
+    , mEventMessage(aEventMessage)
+    , mWindowRaised(aWindowRaised)
+    , mIsRefocus(aIsRefocus)
+    , mRelatedTarget(aRelatedTarget)
+  {
+  }
+
+  NS_IMETHOD Run() override
+  {
+    InternalFocusEvent event(true, mEventMessage);
+    event.mFlags.mBubbles = false;
+    event.mFlags.mCancelable = false;
+    event.mFromRaise = mWindowRaised;
+    event.mIsRefocus = mIsRefocus;
+    event.mRelatedTarget = mRelatedTarget;
+    return EventDispatcher::Dispatch(mTarget, mContext, &event);
+  }
+
+  nsCOMPtr<nsISupports>   mTarget;
+  RefPtr<nsPresContext> mContext;
+  EventMessage            mEventMessage;
+  bool                    mWindowRaised;
+  bool                    mIsRefocus;
+  nsCOMPtr<EventTarget>   mRelatedTarget;
+};
+
+class FocusInOutEvent : public Runnable
+{
+public:
+  FocusInOutEvent(nsISupports* aTarget, EventMessage aEventMessage,
+                 nsPresContext* aContext,
+                 nsPIDOMWindowOuter* aOriginalFocusedWindow,
+                 nsIContent* aOriginalFocusedContent,
+                 EventTarget* aRelatedTarget)
+    : mTarget(aTarget)
+    , mContext(aContext)
+    , mEventMessage(aEventMessage)
+    , mOriginalFocusedWindow(aOriginalFocusedWindow)
+    , mOriginalFocusedContent(aOriginalFocusedContent)
+    , mRelatedTarget(aRelatedTarget)
+  {
+  }
+
+  NS_IMETHOD Run() override
+  {
+    nsCOMPtr<nsIContent> originalWindowFocus = mOriginalFocusedWindow ?
+        mOriginalFocusedWindow->GetFocusedNode() :
+        nullptr;
+    // Blink does not check that focus is the same after blur, but WebKit does.
+    // Opt to follow Blink's behavior (see bug 687787).
+    if (mEventMessage == eFocusOut ||
+        originalWindowFocus == mOriginalFocusedContent) {
+      InternalFocusEvent event(true, mEventMessage);
+      event.mFlags.mBubbles = true;
+      event.mFlags.mCancelable = false;
+      event.mRelatedTarget = mRelatedTarget;
+      return EventDispatcher::Dispatch(mTarget, mContext, &event);
+    }
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsISupports>        mTarget;
+  RefPtr<nsPresContext>        mContext;
+  EventMessage                 mEventMessage;
+  nsCOMPtr<nsPIDOMWindowOuter> mOriginalFocusedWindow;
+  nsCOMPtr<nsIContent>         mOriginalFocusedContent;
+  nsCOMPtr<EventTarget>        mRelatedTarget;
+};
+
+static nsIDocument*
+GetDocumentHelper(EventTarget* aTarget)
+{
+  nsCOMPtr<nsINode> node = do_QueryInterface(aTarget);
+  if (!node) {
+    nsCOMPtr<nsPIDOMWindowInner> win = do_QueryInterface(aTarget);
+    return win ? win->GetExtantDoc() : nullptr;
+  }
+
+  return node->OwnerDoc();
+}
+
+void nsFocusManager::SendFocusInOrOutEvent(EventMessage aEventMessage,
+                                     nsIPresShell* aPresShell,
+                                     nsISupports* aTarget,
+                                     nsPIDOMWindowOuter* aCurrentFocusedWindow,
+                                     nsIContent* aCurrentFocusedContent,
+                                     EventTarget* aRelatedTarget)
+{
+  NS_ASSERTION(aEventMessage == eFocusIn || aEventMessage == eFocusOut,
+      "Wrong event type for SendFocusInOrOutEvent");
+
+  nsContentUtils::AddScriptRunner(
+      new FocusInOutEvent(
+        aTarget,
+        aEventMessage,
+        aPresShell->GetPresContext(),
+        aCurrentFocusedWindow,
+        aCurrentFocusedContent,
+        aRelatedTarget));
+}
+
+void
+nsFocusManager::SendFocusOrBlurEvent(EventMessage aEventMessage,
+                                     nsIPresShell* aPresShell,
+                                     nsIDocument* aDocument,
+                                     nsISupports* aTarget,
+                                     uint32_t aFocusMethod,
+                                     bool aWindowRaised,
+                                     bool aIsRefocus,
+                                     EventTarget* aRelatedTarget)
+{
+  NS_ASSERTION(aEventMessage == eFocus || aEventMessage == eBlur,
+               "Wrong event type for SendFocusOrBlurEvent");
+
+  nsCOMPtr<EventTarget> eventTarget = do_QueryInterface(aTarget);
+  nsCOMPtr<nsIDocument> eventTargetDoc = GetDocumentHelper(eventTarget);
+  nsCOMPtr<nsIDocument> relatedTargetDoc = GetDocumentHelper(aRelatedTarget);
+  nsCOMPtr<nsPIDOMWindowOuter> currentWindow = mFocusedWindow;
+  nsCOMPtr<nsPIDOMWindowInner> targetWindow = do_QueryInterface(aTarget);
+  nsCOMPtr<nsIDocument> targetDocument = do_QueryInterface(aTarget);
+  nsCOMPtr<nsIContent> currentFocusedContent = currentWindow ?
+      currentWindow->GetFocusedNode() : nullptr;
+
+  // set aRelatedTarget to null if it's not in the same document as eventTarget
+  if (eventTargetDoc != relatedTargetDoc) {
+    aRelatedTarget = nullptr;
+  }
+
+  bool dontDispatchEvent =
+    eventTargetDoc && nsContentUtils::IsUserFocusIgnored(eventTargetDoc);
+
+  // for focus events, if this event was from a mouse or key and event
+  // handling on the document is suppressed, queue the event and fire it
+  // later. For blur events, a non-zero value would be set for aFocusMethod.
+  if (aFocusMethod && !dontDispatchEvent &&
+      aDocument && aDocument->EventHandlingSuppressed()) {
+    // aFlags is always 0 when aWindowRaised is true so this won't be called
+    // on a window raise.
+    NS_ASSERTION(!aWindowRaised, "aWindowRaised should not be set");
+
+    for (uint32_t i = mDelayedBlurFocusEvents.Length(); i > 0; --i) {
+      // if this event was already queued, remove it and append it to the end
+      if (mDelayedBlurFocusEvents[i - 1].mEventMessage == aEventMessage &&
+          mDelayedBlurFocusEvents[i - 1].mPresShell == aPresShell &&
+          mDelayedBlurFocusEvents[i - 1].mDocument == aDocument &&
+          mDelayedBlurFocusEvents[i - 1].mTarget == eventTarget &&
+          mDelayedBlurFocusEvents[i - 1].mRelatedTarget == aRelatedTarget) {
+        mDelayedBlurFocusEvents.RemoveElementAt(i - 1);
+      }
+    }
+
+    mDelayedBlurFocusEvents.AppendElement(
+      nsDelayedBlurOrFocusEvent(aEventMessage, aPresShell,
+                                aDocument, eventTarget, aRelatedTarget));
+    return;
+  }
+
+#ifdef ACCESSIBILITY
+  nsAccessibilityService* accService = GetAccService();
+  if (accService) {
+    if (aEventMessage == eFocus) {
+      accService->NotifyOfDOMFocus(aTarget);
+    } else {
+      accService->NotifyOfDOMBlur(aTarget);
+    }
+  }
+#endif
+
+  if (!dontDispatchEvent) {
+    nsContentUtils::AddScriptRunner(
+      new FocusBlurEvent(aTarget, aEventMessage, aPresShell->GetPresContext(),
+                         aWindowRaised, aIsRefocus, aRelatedTarget));
+
+    // Check that the target is not a window or document before firing
+    // focusin/focusout. Other browsers do not fire focusin/focusout on window,
+    // despite being required in the spec, so follow their behavior.
+    //
+    // As for document, we should not even fire focus/blur, but until then, we
+    // need this check. targetDocument should be removed once bug 1228802 is
+    // resolved.
+    if (!targetWindow && !targetDocument) {
+      EventMessage focusInOrOutMessage = aEventMessage == eFocus ? eFocusIn : eFocusOut;
+      SendFocusInOrOutEvent(focusInOrOutMessage, aPresShell, aTarget,
+          currentWindow, currentFocusedContent, aRelatedTarget);
+    }
+  }
+}
+
+void
+nsFocusManager::ScrollIntoView(nsIPresShell* aPresShell,
+                               nsIContent* aContent,
+                               uint32_t aFlags)
+{
+  // if the noscroll flag isn't set, scroll the newly focused element into view
+  if (!(aFlags & FLAG_NOSCROLL))
+    aPresShell->ScrollContentIntoView(aContent,
+                                      nsIPresShell::ScrollAxis(
+                                        nsIPresShell::SCROLL_MINIMUM,
+                                        nsIPresShell::SCROLL_IF_NOT_VISIBLE),
+                                      nsIPresShell::ScrollAxis(
+                                        nsIPresShell::SCROLL_MINIMUM,
+                                        nsIPresShell::SCROLL_IF_NOT_VISIBLE),
+                                      nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
+}
+
+
+void
+nsFocusManager::RaiseWindow(nsPIDOMWindowOuter* aWindow)
+{
+  // don't raise windows that are already raised or are in the process of
+  // being lowered
+  if (!aWindow || aWindow == mActiveWindow || aWindow == mWindowBeingLowered)
+    return;
+
+  if (sTestMode) {
+    // In test mode, emulate the existing window being lowered and the new
+    // window being raised.
+    if (mActiveWindow)
+      WindowLowered(mActiveWindow);
+    WindowRaised(aWindow);
+    return;
+  }
+
+#if defined(XP_WIN)
+  // Windows would rather we focus the child widget, otherwise, the toplevel
+  // widget will always end up being focused. Fortunately, focusing the child
+  // widget will also have the effect of raising the window this widget is in.
+  // But on other platforms, we can just focus the toplevel widget to raise
+  // the window.
+  nsCOMPtr<nsPIDOMWindowOuter> childWindow;
+  GetFocusedDescendant(aWindow, true, getter_AddRefs(childWindow));
+  if (!childWindow)
+    childWindow = aWindow;
+
+  nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
+  if (!docShell)
+    return;
+
+  nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
+  if (!presShell)
+    return;
+
+  nsViewManager* vm = presShell->GetViewManager();
+  if (vm) {
+    nsCOMPtr<nsIWidget> widget;
+    vm->GetRootWidget(getter_AddRefs(widget));
+    if (widget)
+      widget->SetFocus(true);
+  }
+#else
+  nsCOMPtr<nsIBaseWindow> treeOwnerAsWin =
+    do_QueryInterface(aWindow->GetDocShell());
+  if (treeOwnerAsWin) {
+    nsCOMPtr<nsIWidget> widget;
+    treeOwnerAsWin->GetMainWidget(getter_AddRefs(widget));
+    if (widget)
+      widget->SetFocus(true);
+  }
+#endif
+}
+
+void
+nsFocusManager::UpdateCaretForCaretBrowsingMode()
+{
+  UpdateCaret(false, true, mFocusedContent);
+}
+
+void
+nsFocusManager::UpdateCaret(bool aMoveCaretToFocus,
+                            bool aUpdateVisibility,
+                            nsIContent* aContent)
+{
+  LOGFOCUS(("Update Caret: %d %d", aMoveCaretToFocus, aUpdateVisibility));
+
+  if (!mFocusedWindow)
+    return;
+
+  // this is called when a document is focused or when the caretbrowsing
+  // preference is changed
+  nsCOMPtr<nsIDocShell> focusedDocShell = mFocusedWindow->GetDocShell();
+  nsCOMPtr<nsIDocShellTreeItem> dsti = do_QueryInterface(focusedDocShell);
+  if (!dsti)
+    return;
+
+  if (dsti->ItemType() == nsIDocShellTreeItem::typeChrome) {
+    return;  // Never browse with caret in chrome
+  }
+
+  bool browseWithCaret =
+    Preferences::GetBool("accessibility.browsewithcaret");
+
+  nsCOMPtr<nsIPresShell> presShell = focusedDocShell->GetPresShell();
+  if (!presShell)
+    return;
+
+  // If this is an editable document which isn't contentEditable, or a
+  // contentEditable document and the node to focus is contentEditable,
+  // return, so that we don't mess with caret visibility.
+  bool isEditable = false;
+  focusedDocShell->GetEditable(&isEditable);
+
+  if (isEditable) {
+    nsCOMPtr<nsIHTMLDocument> doc =
+      do_QueryInterface(presShell->GetDocument());
+
+    bool isContentEditableDoc =
+      doc && doc->GetEditingState() == nsIHTMLDocument::eContentEditable;
+
+    bool isFocusEditable =
+      aContent && aContent->HasFlag(NODE_IS_EDITABLE);
+    if (!isContentEditableDoc || isFocusEditable)
+      return;
+  }
+
+  if (!isEditable && aMoveCaretToFocus)
+    MoveCaretToFocus(presShell, aContent);
+
+  if (!aUpdateVisibility)
+    return;
+
+  // XXXndeakin this doesn't seem right. It should be checking for this only
+  // on the nearest ancestor frame which is a chrome frame. But this is
+  // what the existing code does, so just leave it for now.
+  if (!browseWithCaret) {
+    nsCOMPtr<Element> docElement =
+      mFocusedWindow->GetFrameElementInternal();
+    if (docElement)
+      browseWithCaret = docElement->AttrValueIs(kNameSpaceID_None,
+                                                nsGkAtoms::showcaret,
+                                                NS_LITERAL_STRING("true"),
+                                                eCaseMatters);
+  }
+
+  SetCaretVisible(presShell, browseWithCaret, aContent);
+}
+
+void
+nsFocusManager::MoveCaretToFocus(nsIPresShell* aPresShell, nsIContent* aContent)
+{
+  // domDoc is a document interface we can create a range with
+  nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(aPresShell->GetDocument());
+  if (domDoc) {
+    RefPtr<nsFrameSelection> frameSelection = aPresShell->FrameSelection();
+    nsCOMPtr<nsISelection> domSelection =
+      frameSelection->GetSelection(SelectionType::eNormal);
+    if (domSelection) {
+      nsCOMPtr<nsIDOMNode> currentFocusNode(do_QueryInterface(aContent));
+      // First clear the selection. This way, if there is no currently focused
+      // content, the selection will just be cleared.
+      domSelection->RemoveAllRanges();
+      if (currentFocusNode) {
+        nsCOMPtr<nsIDOMRange> newRange;
+        nsresult rv = domDoc->CreateRange(getter_AddRefs(newRange));
+        if (NS_SUCCEEDED(rv)) {
+          // Set the range to the start of the currently focused node
+          // Make sure it's collapsed
+          newRange->SelectNodeContents(currentFocusNode);
+          nsCOMPtr<nsIDOMNode> firstChild;
+          currentFocusNode->GetFirstChild(getter_AddRefs(firstChild));
+          if (!firstChild ||
+              aContent->IsNodeOfType(nsINode::eHTML_FORM_CONTROL)) {
+            // If current focus node is a leaf, set range to before the
+            // node by using the parent as a container.
+            // This prevents it from appearing as selected.
+            newRange->SetStartBefore(currentFocusNode);
+            newRange->SetEndBefore(currentFocusNode);
+          }
+          domSelection->AddRange(newRange);
+          domSelection->CollapseToStart();
+        }
+      }
+    }
+  }
+}
+
+nsresult
+nsFocusManager::SetCaretVisible(nsIPresShell* aPresShell,
+                                bool aVisible,
+                                nsIContent* aContent)
+{
+  // When browsing with caret, make sure caret is visible after new focus
+  // Return early if there is no caret. This can happen for the testcase
+  // for bug 308025 where a window is closed in a blur handler.
+  RefPtr<nsCaret> caret = aPresShell->GetCaret();
+  if (!caret)
+    return NS_OK;
+
+  bool caretVisible = caret->IsVisible();
+  if (!aVisible && !caretVisible)
+    return NS_OK;
+
+  RefPtr<nsFrameSelection> frameSelection;
+  if (aContent) {
+    NS_ASSERTION(aContent->GetComposedDoc() == aPresShell->GetDocument(),
+                 "Wrong document?");
+    nsIFrame *focusFrame = aContent->GetPrimaryFrame();
+    if (focusFrame)
+      frameSelection = focusFrame->GetFrameSelection();
+  }
+
+  RefPtr<nsFrameSelection> docFrameSelection = aPresShell->FrameSelection();
+
+  if (docFrameSelection && caret &&
+     (frameSelection == docFrameSelection || !aContent)) {
+    nsISelection* domSelection =
+      docFrameSelection->GetSelection(SelectionType::eNormal);
+    if (domSelection) {
+      nsCOMPtr<nsISelectionController> selCon(do_QueryInterface(aPresShell));
+      if (!selCon) {
+        return NS_ERROR_FAILURE;
+      }
+      // First, hide the caret to prevent attempting to show it in SetCaretDOMSelection
+      selCon->SetCaretEnabled(false);
+
+      // Caret must blink on non-editable elements
+      caret->SetIgnoreUserModify(true);
+      // Tell the caret which selection to use
+      caret->SetSelection(domSelection);
+
+      // In content, we need to set the caret. The only special case is edit
+      // fields, which have a different frame selection from the document.
+      // They will take care of making the caret visible themselves.
+
+      selCon->SetCaretReadOnly(false);
+      selCon->SetCaretEnabled(aVisible);
+    }
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsFocusManager::GetSelectionLocation(nsIDocument* aDocument,
+                                     nsIPresShell* aPresShell,
+                                     nsIContent **aStartContent,
+                                     nsIContent **aEndContent)
+{
+  *aStartContent = *aEndContent = nullptr;
+  nsresult rv = NS_ERROR_FAILURE;
+
+  nsPresContext* presContext = aPresShell->GetPresContext();
+  NS_ASSERTION(presContext, "mPresContent is null!!");
+
+  RefPtr<nsFrameSelection> frameSelection = aPresShell->FrameSelection();
+
+  nsCOMPtr<nsISelection> domSelection;
+  if (frameSelection) {
+    domSelection = frameSelection->GetSelection(SelectionType::eNormal);
+  }
+
+  nsCOMPtr<nsIDOMNode> startNode, endNode;
+  bool isCollapsed = false;
+  nsCOMPtr<nsIContent> startContent, endContent;
+  int32_t startOffset = 0;
+  if (domSelection) {
+    domSelection->GetIsCollapsed(&isCollapsed);
+    nsCOMPtr<nsIDOMRange> domRange;
+    rv = domSelection->GetRangeAt(0, getter_AddRefs(domRange));
+    if (domRange) {
+      domRange->GetStartContainer(getter_AddRefs(startNode));
+      domRange->GetEndContainer(getter_AddRefs(endNode));
+      domRange->GetStartOffset(&startOffset);
+
+      nsIContent *childContent = nullptr;
+
+      startContent = do_QueryInterface(startNode);
+      if (startContent && startContent->IsElement()) {
+        NS_ASSERTION(startOffset >= 0, "Start offset cannot be negative");  
+        childContent = startContent->GetChildAt(startOffset);
+        if (childContent) {
+          startContent = childContent;
+        }
+      }
+
+      endContent = do_QueryInterface(endNode);
+      if (endContent && endContent->IsElement()) {
+        int32_t endOffset = 0;
+        domRange->GetEndOffset(&endOffset);
+        NS_ASSERTION(endOffset >= 0, "End offset cannot be negative");
+        childContent = endContent->GetChildAt(endOffset);
+        if (childContent) {
+          endContent = childContent;
+        }
+      }
+    }
+  }
+  else {
+    rv = NS_ERROR_INVALID_ARG;
+  }
+
+  nsIFrame *startFrame = nullptr;
+  if (startContent) {
+    startFrame = startContent->GetPrimaryFrame();
+    if (isCollapsed) {
+      // Next check to see if our caret is at the very end of a node
+      // If so, the caret is actually sitting in front of the next
+      // logical frame's primary node - so for this case we need to
+      // change caretContent to that node.
+
+      if (startContent->NodeType() == nsIDOMNode::TEXT_NODE) {
+        nsAutoString nodeValue;
+        startContent->AppendTextTo(nodeValue);
+
+        bool isFormControl =
+          startContent->IsNodeOfType(nsINode::eHTML_FORM_CONTROL);
+
+        if (nodeValue.Length() == (uint32_t)startOffset && !isFormControl &&
+            startContent != aDocument->GetRootElement()) {
+          // Yes, indeed we were at the end of the last node
+          nsCOMPtr<nsIFrameEnumerator> frameTraversal;
+          nsresult rv = NS_NewFrameTraversal(getter_AddRefs(frameTraversal),
+                                             presContext, startFrame,
+                                             eLeaf,
+                                             false, // aVisual
+                                             false, // aLockInScrollView
+                                             true,  // aFollowOOFs
+                                             false  // aSkipPopupChecks
+                                             );
+          NS_ENSURE_SUCCESS(rv, rv);
+
+          nsIFrame *newCaretFrame = nullptr;
+          nsCOMPtr<nsIContent> newCaretContent = startContent;
+          bool endOfSelectionInStartNode(startContent == endContent);
+          do {
+            // Continue getting the next frame until the primary content for the frame
+            // we are on changes - we don't want to be stuck in the same place
+            frameTraversal->Next();
+            newCaretFrame = static_cast<nsIFrame*>(frameTraversal->CurrentItem());
+            if (nullptr == newCaretFrame)
+              break;
+            newCaretContent = newCaretFrame->GetContent();
+          } while (!newCaretContent || newCaretContent == startContent);
+
+          if (newCaretFrame && newCaretContent) {
+            // If the caret is exactly at the same position of the new frame,
+            // then we can use the newCaretFrame and newCaretContent for our position
+            nsRect caretRect;
+            nsIFrame *frame = nsCaret::GetGeometry(domSelection, &caretRect);
+            if (frame) {
+              nsPoint caretWidgetOffset;
+              nsIWidget *widget = frame->GetNearestWidget(caretWidgetOffset);
+              caretRect.MoveBy(caretWidgetOffset);
+              nsPoint newCaretOffset;
+              nsIWidget *newCaretWidget = newCaretFrame->GetNearestWidget(newCaretOffset);
+              if (widget == newCaretWidget && caretRect.y == newCaretOffset.y &&
+                  caretRect.x == newCaretOffset.x) {
+                // The caret is at the start of the new element.
+                startFrame = newCaretFrame;
+                startContent = newCaretContent;
+                if (endOfSelectionInStartNode) {
+                  endContent = newCaretContent; // Ensure end of selection is not before start
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  *aStartContent = startContent;
+  *aEndContent = endContent;
+  NS_IF_ADDREF(*aStartContent);
+  NS_IF_ADDREF(*aEndContent);
+
+  return rv;
+}
+
+nsresult
+nsFocusManager::DetermineElementToMoveFocus(nsPIDOMWindowOuter* aWindow,
+                                            nsIContent* aStartContent,
+                                            int32_t aType, bool aNoParentTraversal,
+                                            nsIContent** aNextContent)
+{
+  *aNextContent = nullptr;
+
+  // True if we are navigating by document (F6/Shift+F6) or false if we are
+  // navigating by element (Tab/Shift+Tab).
+  bool forDocumentNavigation = false;
+
+  // This is used for document navigation only. It will be set to true if we
+  // start navigating from a starting point. If this starting point is near the
+  // end of the document (for example, an element on a statusbar), and there
+  // are no child documents or panels before the end of the document, then we
+  // will need to ensure that we don't consider the root chrome window when we
+  // loop around and instead find the next child document/panel, as focus is
+  // already in that window. This flag will be cleared once we navigate into
+  // another document.
+  bool mayFocusRoot = (aStartContent != nullptr);
+
+  nsCOMPtr<nsIContent> startContent = aStartContent;
+  if (!startContent && aType != MOVEFOCUS_CARET) {
+    if (aType == MOVEFOCUS_FORWARDDOC || aType == MOVEFOCUS_BACKWARDDOC) {
+      // When moving between documents, make sure to get the right
+      // starting content in a descendant.
+      nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
+      startContent = GetFocusedDescendant(aWindow, true, getter_AddRefs(focusedWindow));
+    }
+    else if (aType != MOVEFOCUS_LASTDOC) {
+      // Otherwise, start at the focused node. If MOVEFOCUS_LASTDOC is used,
+      // then we are document-navigating backwards from chrome to the content
+      // process, and we don't want to use this so that we start from the end
+      // of the document.
+      startContent = aWindow->GetFocusedNode();
+    }
+  }
+
+  nsCOMPtr<nsIDocument> doc;
+  if (startContent)
+    doc = startContent->GetComposedDoc();
+  else
+    doc = aWindow->GetExtantDoc();
+  if (!doc)
+    return NS_OK;
+
+  LookAndFeel::GetInt(LookAndFeel::eIntID_TabFocusModel,
+                      &nsIContent::sTabFocusModel);
+
+  // These types are for document navigation using F6.
+  if (aType == MOVEFOCUS_FORWARDDOC || aType == MOVEFOCUS_BACKWARDDOC ||
+      aType == MOVEFOCUS_FIRSTDOC || aType == MOVEFOCUS_LASTDOC) {
+    forDocumentNavigation = true;
+  }
+
+  // If moving to the root or first document, find the root element and return.
+  if (aType == MOVEFOCUS_ROOT || aType == MOVEFOCUS_FIRSTDOC) {
+    NS_IF_ADDREF(*aNextContent = GetRootForFocus(aWindow, doc, false, false));
+    if (!*aNextContent && aType == MOVEFOCUS_FIRSTDOC) {
+      // When looking for the first document, if the root wasn't focusable,
+      // find the next focusable document.
+      aType = MOVEFOCUS_FORWARDDOC;
+    } else {
+      return NS_OK;
+    }
+  }
+
+  nsIContent* rootContent = doc->GetRootElement();
+  NS_ENSURE_TRUE(rootContent, NS_OK);
+
+  nsIPresShell *presShell = doc->GetShell();
+  NS_ENSURE_TRUE(presShell, NS_OK);
+
+  if (aType == MOVEFOCUS_FIRST) {
+    if (!aStartContent)
+      startContent = rootContent;
+    return GetNextTabbableContent(presShell, startContent,
+                                  nullptr, startContent,
+                                  true, 1, false, false, aNextContent);
+  }
+  if (aType == MOVEFOCUS_LAST) {
+    if (!aStartContent)
+      startContent = rootContent;
+    return GetNextTabbableContent(presShell, startContent,
+                                  nullptr, startContent,
+                                  false, 0, false, false, aNextContent);
+  }
+
+  bool forward = (aType == MOVEFOCUS_FORWARD ||
+                  aType == MOVEFOCUS_FORWARDDOC ||
+                  aType == MOVEFOCUS_CARET);
+  bool doNavigation = true;
+  bool ignoreTabIndex = false;
+  // when a popup is open, we want to ensure that tab navigation occurs only
+  // within the most recently opened panel. If a popup is open, its frame will
+  // be stored in popupFrame.
+  nsIFrame* popupFrame = nullptr;
+
+  int32_t tabIndex = forward ? 1 : 0;
+  if (startContent) {
+    nsIFrame* frame = startContent->GetPrimaryFrame();
+    if (startContent->IsHTMLElement(nsGkAtoms::area))
+      startContent->IsFocusable(&tabIndex);
+    else if (frame)
+      frame->IsFocusable(&tabIndex, 0);
+    else
+      startContent->IsFocusable(&tabIndex);
+
+    // if the current element isn't tabbable, ignore the tabindex and just
+    // look for the next element. The root content won't have a tabindex
+    // so just treat this as the beginning of the tab order.
+    if (tabIndex < 0) {
+      tabIndex = 1;
+      if (startContent != rootContent)
+        ignoreTabIndex = true;
+    }
+
+    // check if the focus is currently inside a popup. Elements such as the
+    // autocomplete widget use the noautofocus attribute to allow the focus to
+    // remain outside the popup when it is opened.
+    if (frame) {
+      popupFrame = nsLayoutUtils::GetClosestFrameOfType(frame,
+                                                        nsGkAtoms::menuPopupFrame);
+    }
+
+    if (popupFrame && !forDocumentNavigation) {
+      // Don't navigate outside of a popup, so pretend that the
+      // root content is the popup itself
+      rootContent = popupFrame->GetContent();
+      NS_ASSERTION(rootContent, "Popup frame doesn't have a content node");
+    }
+    else if (!forward) {
+      // If focus moves backward and when current focused node is root
+      // content or <body> element which is editable by contenteditable
+      // attribute, focus should move to its parent document.
+      if (startContent == rootContent) {
+        doNavigation = false;
+      } else {
+        nsIDocument* doc = startContent->GetComposedDoc();
+        if (startContent ==
+              nsLayoutUtils::GetEditableRootContentByContentEditable(doc)) {
+          doNavigation = false;
+        }
+      }
+    }
+  }
+  else {
+#ifdef MOZ_XUL
+    if (aType != MOVEFOCUS_CARET) {
+      // if there is no focus, yet a panel is open, focus the first item in
+      // the panel
+      nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
+      if (pm)
+        popupFrame = pm->GetTopPopup(ePopupTypePanel);
+    }
+#endif
+    if (popupFrame) {
+      // When there is a popup open, and no starting content, start the search
+      // at the topmost popup.
+      startContent = popupFrame->GetContent();
+      NS_ASSERTION(startContent, "Popup frame doesn't have a content node");
+      // Unless we are searching for documents, set the root content to the
+      // popup as well, so that we don't tab-navigate outside the popup.
+      // When navigating by documents, we start at the popup but can navigate
+      // outside of it to look for other panels and documents.
+      if (!forDocumentNavigation) {
+        rootContent = startContent;
+      }
+
+      doc = startContent ? startContent->GetComposedDoc() : nullptr;
+    }
+    else {
+      // Otherwise, for content shells, start from the location of the caret.
+      nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
+      if (docShell && docShell->ItemType() != nsIDocShellTreeItem::typeChrome) {
+        nsCOMPtr<nsIContent> endSelectionContent;
+        GetSelectionLocation(doc, presShell,
+                             getter_AddRefs(startContent),
+                             getter_AddRefs(endSelectionContent));
+        // If the selection is on the rootContent, then there is no selection
+        if (startContent == rootContent) {
+          startContent = nullptr;
+        }
+
+        if (aType == MOVEFOCUS_CARET) {
+          // GetFocusInSelection finds a focusable link near the caret.
+          // If there is no start content though, don't do this to avoid
+          // focusing something unexpected.
+          if (startContent) {
+            GetFocusInSelection(aWindow, startContent,
+                                endSelectionContent, aNextContent);
+          }
+          return NS_OK;
+        }
+
+        if (startContent) {
+          // when starting from a selection, we always want to find the next or
+          // previous element in the document. So the tabindex on elements
+          // should be ignored.
+          ignoreTabIndex = true;
+        }
+      }
+
+      if (!startContent) {
+        // otherwise, just use the root content as the starting point
+        startContent = rootContent;
+        NS_ENSURE_TRUE(startContent, NS_OK);
+      }
+    }
+  }
+
+  // Check if the starting content is the same as the content assigned to the
+  // retargetdocumentfocus attribute. Is so, we don't want to start searching
+  // from there but instead from the beginning of the document. Otherwise, the
+  // content that appears before the retargetdocumentfocus element will never
+  // get checked as it will be skipped when the focus is retargetted to it.
+  if (forDocumentNavigation && doc->IsXULDocument()) {
+    nsAutoString retarget;
+
+    if (rootContent->GetAttr(kNameSpaceID_None,
+                             nsGkAtoms::retargetdocumentfocus, retarget)) {
+      nsIContent* retargetElement = doc->GetElementById(retarget);
+      // The common case here is the urlbar where focus is on the anonymous
+      // input inside the textbox, but the retargetdocumentfocus attribute
+      // refers to the textbox. The Contains check will return false and the
+      // ContentIsDescendantOf check will return true in this case.
+      if (retargetElement && (retargetElement == startContent ||
+                              (!retargetElement->Contains(startContent) &&
+                              nsContentUtils::ContentIsDescendantOf(startContent, retargetElement)))) {
+        startContent = rootContent;
+      }
+    }
+  }
+
+  NS_ASSERTION(startContent, "starting content not set");
+
+  // keep a reference to the starting content. If we find that again, it means
+  // we've iterated around completely and we don't want to adjust the focus.
+  // The skipOriginalContentCheck will be set to true only for the first time
+  // GetNextTabbableContent is called. This ensures that we don't break out
+  // when nothing is focused to start with. Specifically,
+  // GetNextTabbableContent first checks the root content -- which happens to
+  // be the same as the start content -- when nothing is focused and tabbing
+  // forward. Without skipOriginalContentCheck set to true, we'd end up
+  // returning right away and focusing nothing. Luckily, GetNextTabbableContent
+  // will never wrap around on its own, and can only return the original
+  // content when it is called a second time or later.
+  bool skipOriginalContentCheck = true;
+  nsIContent* originalStartContent = startContent;
+
+  LOGCONTENTNAVIGATION("Focus Navigation Start Content %s", startContent.get());
+  LOGFOCUSNAVIGATION(("  Forward: %d Tabindex: %d Ignore: %d DocNav: %d",
+                      forward, tabIndex, ignoreTabIndex, forDocumentNavigation));
+
+  while (doc) {
+    if (doNavigation) {
+      nsCOMPtr<nsIContent> nextFocus;
+      nsresult rv = GetNextTabbableContent(presShell, rootContent,
+                                           skipOriginalContentCheck ? nullptr : originalStartContent,
+                                           startContent, forward,
+                                           tabIndex, ignoreTabIndex,
+                                           forDocumentNavigation,
+                                           getter_AddRefs(nextFocus));
+      NS_ENSURE_SUCCESS(rv, rv);
+      if (rv == NS_SUCCESS_DOM_NO_OPERATION) {
+        // Navigation was redirected to a child process, so just return.
+        return NS_OK;
+      }
+
+      // found a content node to focus.
+      if (nextFocus) {
+        LOGCONTENTNAVIGATION("Next Content: %s", nextFocus.get());
+
+        // as long as the found node was not the same as the starting node,
+        // set it as the return value. For document navigation, we can return
+        // the same element in case there is only one content node that could
+        // be returned, for example, in a child process document. 
+        if (nextFocus != originalStartContent || forDocumentNavigation) {
+          nextFocus.forget(aNextContent);
+        }
+        return NS_OK;
+      }
+
+      if (popupFrame && !forDocumentNavigation) {
+        // in a popup, so start again from the beginning of the popup. However,
+        // if we already started at the beginning, then there isn't anything to
+        // focus, so just return
+        if (startContent != rootContent) {
+          startContent = rootContent;
+          tabIndex = forward ? 1 : 0;
+          continue;
+        }
+        return NS_OK;
+      }
+    }
+
+    doNavigation = true;
+    skipOriginalContentCheck = forDocumentNavigation;
+    ignoreTabIndex = false;
+
+    if (aNoParentTraversal) {
+      if (startContent == rootContent)
+        return NS_OK;
+
+      startContent = rootContent;
+      tabIndex = forward ? 1 : 0;
+      continue;
+    }
+
+    // Reached the beginning or end of the document. Next, navigate up to the
+    // parent document and try again.
+    nsCOMPtr<nsPIDOMWindowOuter> piWindow = doc->GetWindow();
+    NS_ENSURE_TRUE(piWindow, NS_ERROR_FAILURE);
+
+    nsCOMPtr<nsIDocShell> docShell = piWindow->GetDocShell();
+    NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);
+
+    // Get the frame element this window is inside and, from that, get the
+    // parent document and presshell. If there is no enclosing frame element,
+    // then this is a top-level, embedded or remote window.
+    startContent = piWindow->GetFrameElementInternal();
+    if (startContent) {
+      doc = startContent->GetComposedDoc();
+      NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
+
+      rootContent = doc->GetRootElement();
+      presShell = doc->GetShell();
+
+      // We can focus the root element now that we have moved to another document.
+      mayFocusRoot = true;
+
+      nsIFrame* frame = startContent->GetPrimaryFrame();
+      if (!frame) {
+        return NS_OK;
+      }
+
+      frame->IsFocusable(&tabIndex, 0);
+      if (tabIndex < 0) {
+        tabIndex = 1;
+        ignoreTabIndex = true;
+      }
+
+      // if the frame is inside a popup, make sure to scan only within the
+      // popup. This handles the situation of tabbing amongst elements
+      // inside an iframe which is itself inside a popup. Otherwise,
+      // navigation would move outside the popup when tabbing outside the
+      // iframe.
+      if (!forDocumentNavigation) {
+        popupFrame = nsLayoutUtils::GetClosestFrameOfType(frame,
+                                                          nsGkAtoms::menuPopupFrame);
+        if (popupFrame) {
+          rootContent = popupFrame->GetContent();
+          NS_ASSERTION(rootContent, "Popup frame doesn't have a content node");
+        }
+      }
+    }
+    else {
+      // There is no parent, so call the tree owner. This will tell the
+      // embedder or parent process that it should take the focus.
+      bool tookFocus;
+      docShell->TabToTreeOwner(forward, forDocumentNavigation, &tookFocus);
+      // If the tree owner took the focus, blur the current content.
+      if (tookFocus) {
+        nsCOMPtr<nsPIDOMWindowOuter> window = docShell->GetWindow();
+        if (window->GetFocusedNode() == mFocusedContent)
+          Blur(mFocusedWindow, nullptr, true, true);
+        else
+          window->SetFocusedNode(nullptr);
+        return NS_OK;
+      }
+
+      // If we have reached the end of the top-level document, focus the
+      // first element in the top-level document. This should always happen
+      // when navigating by document forwards but when navigating backwards,
+      // only do this if we started in another document or within a popup frame.
+      // If the focus started in this window outside a popup however, we should
+      // continue by looping around to the end again.
+      if (forDocumentNavigation && (forward || mayFocusRoot || popupFrame)) {
+        // HTML content documents can have their root element focused (a focus
+        // ring appears around the entire content area frame). This root
+        // appears in the tab order before all of the elements in the document.
+        // Chrome documents however cannot be focused directly, so instead we
+        // focus the first focusable element within the window.
+        // For example, the urlbar.
+        nsIContent* root = GetRootForFocus(piWindow, doc, true, true);
+        return FocusFirst(root, aNextContent);
+      }
+
+      // Once we have hit the top-level and have iterated to the end again, we
+      // just want to break out next time we hit this spot to prevent infinite
+      // iteration.
+      mayFocusRoot = true;
+
+      // reset the tab index and start again from the beginning or end
+      startContent = rootContent;
+      tabIndex = forward ? 1 : 0;
+    }
+
+    // wrapped all the way around and didn't find anything to move the focus
+    // to, so just break out
+    if (startContent == originalStartContent)
+      break;
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsFocusManager::GetNextTabbableContent(nsIPresShell* aPresShell,
+                                       nsIContent* aRootContent,
+                                       nsIContent* aOriginalStartContent,
+                                       nsIContent* aStartContent,
+                                       bool aForward,
+                                       int32_t aCurrentTabIndex,
+                                       bool aIgnoreTabIndex,
+                                       bool aForDocumentNavigation,
+                                       nsIContent** aResultContent)
+{
+  *aResultContent = nullptr;
+
+  nsCOMPtr<nsIContent> startContent = aStartContent;
+  if (!startContent)
+    return NS_OK;
+
+  LOGCONTENTNAVIGATION("GetNextTabbable: %s", aStartContent);
+  LOGFOCUSNAVIGATION(("  tabindex: %d", aCurrentTabIndex));
+
+  nsPresContext* presContext = aPresShell->GetPresContext();
+
+  bool getNextFrame = true;
+  nsCOMPtr<nsIContent> iterStartContent = aStartContent;
+  while (1) {
+    nsIFrame* startFrame = iterStartContent->GetPrimaryFrame();
+    // if there is no frame, look for another content node that has a frame
+    if (!startFrame) {
+      // if the root content doesn't have a frame, just return
+      if (iterStartContent == aRootContent)
+        return NS_OK;
+
+      // look for the next or previous content node in tree order
+      iterStartContent = aForward ? iterStartContent->GetNextNode() : iterStartContent->GetPreviousContent();
+      // we've already skipped over the initial focused content, so we
+      // don't want to traverse frames.
+      getNextFrame = false;
+      if (iterStartContent)
+        continue;
+
+      // otherwise, as a last attempt, just look at the root content
+      iterStartContent = aRootContent;
+      continue;
+    }
+
+    // For tab navigation, pass false for aSkipPopupChecks so that we don't
+    // iterate into or out of a popup. For document naviation pass true to
+    // ignore these boundaries.
+    nsCOMPtr<nsIFrameEnumerator> frameTraversal;
+    nsresult rv = NS_NewFrameTraversal(getter_AddRefs(frameTraversal),
+                                       presContext, startFrame,
+                                       ePreOrder,
+                                       false, // aVisual
+                                       false, // aLockInScrollView
+                                       true,  // aFollowOOFs
+                                       aForDocumentNavigation  // aSkipPopupChecks
+                                       );
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (iterStartContent == aRootContent) {
+      if (!aForward) {
+        frameTraversal->Last();
+      } else if (aRootContent->IsFocusable()) {
+        frameTraversal->Next();
+      }
+    }
+    else if (getNextFrame &&
+             (!iterStartContent ||
+              !iterStartContent->IsHTMLElement(nsGkAtoms::area))) {
+      // Need to do special check in case we're in an imagemap which has multiple
+      // content nodes per frame, so don't skip over the starting frame.
+      if (aForward)
+        frameTraversal->Next();
+      else
+        frameTraversal->Prev();
+    }
+
+    // Walk frames to find something tabbable matching mCurrentTabIndex
+    nsIFrame* frame = static_cast<nsIFrame*>(frameTraversal->CurrentItem());
+    while (frame) {
+      nsIContent* currentContent = frame->GetContent();
+
+      // For document navigation, check if this element is an open panel. Since
+      // panels aren't focusable (tabIndex would be -1), we'll just assume that
+      // for document navigation, the tabIndex is 0.
+      if (aForDocumentNavigation && currentContent && (aCurrentTabIndex == 0) &&
+          currentContent->IsXULElement(nsGkAtoms::panel)) {
+        nsMenuPopupFrame* popupFrame = do_QueryFrame(frame);
+        // Check if the panel is open. Closed panels are ignored since you can't
+        // focus anything in them.
+        if (popupFrame && popupFrame->IsOpen()) {
+          // When moving backward, skip the popup we started in otherwise it
+          // will be selected again.
+          bool validPopup = true;
+          if (!aForward) {
+            nsIContent* content = aStartContent;
+            while (content) {
+              if (content == currentContent) {
+                validPopup = false;
+                break;
+              }
+
+              content = content->GetParent();
+            }
+          }
+
+          if (validPopup) {
+            // Since a panel isn't focusable itself, find the first focusable
+            // content within the popup. If there isn't any focusable content
+            // in the popup, skip this popup and continue iterating through the
+            // frames. We pass the panel itself (currentContent) as the starting
+            // and root content, so that we only find content within the panel.
+            // Note also that we pass false for aForDocumentNavigation since we
+            // want to locate the first content, not the first document.
+            rv = GetNextTabbableContent(aPresShell, currentContent,
+                                        nullptr, currentContent,
+                                        true, 1, false, false,
+                                        aResultContent);
+            if (NS_SUCCEEDED(rv) && *aResultContent) {
+              return rv;
+            }
+          }
+        }
+      }
+
+      // TabIndex not set defaults to 0 for form elements, anchors and other
+      // elements that are normally focusable. Tabindex defaults to -1
+      // for elements that are not normally focusable.
+      // The returned computed tabindex from IsFocusable() is as follows:
+      //          < 0 not tabbable at all
+      //          == 0 in normal tab order (last after positive tabindexed items)
+      //          > 0 can be tabbed to in the order specified by this value
+      int32_t tabIndex;
+      frame->IsFocusable(&tabIndex, 0);
+
+      LOGCONTENTNAVIGATION("Next Tabbable %s:", frame->GetContent());
+      LOGFOCUSNAVIGATION(("  with tabindex: %d expected: %d", tabIndex, aCurrentTabIndex));
+
+      if (tabIndex >= 0) {
+        NS_ASSERTION(currentContent, "IsFocusable set a tabindex for a frame with no content");
+        if (!aForDocumentNavigation &&
+            currentContent->IsHTMLElement(nsGkAtoms::img) &&
+            currentContent->HasAttr(kNameSpaceID_None, nsGkAtoms::usemap)) {
+          // This is an image with a map. Image map areas are not traversed by
+          // nsIFrameTraversal so look for the next or previous area element.
+          nsIContent *areaContent =
+            GetNextTabbableMapArea(aForward, aCurrentTabIndex,
+                                   currentContent, iterStartContent);
+          if (areaContent) {
+            NS_ADDREF(*aResultContent = areaContent);
+            return NS_OK;
+          }
+        }
+        else if (aIgnoreTabIndex || aCurrentTabIndex == tabIndex) {
+          // break out if we've wrapped around to the start again.
+          if (aOriginalStartContent && currentContent == aOriginalStartContent) {
+            NS_ADDREF(*aResultContent = currentContent);
+            return NS_OK;
+          }
+
+          // If this is a remote child browser, call NavigateDocument to have
+          // the child process continue the navigation. Return a special error
+          // code to have the caller return early. If the child ends up not
+          // being focusable in some way, the child process will call back
+          // into document navigation again by calling MoveFocus.
+          TabParent* remote = TabParent::GetFrom(currentContent);
+          if (remote) {
+            remote->NavigateByKey(aForward, aForDocumentNavigation);
+            return NS_SUCCESS_DOM_NO_OPERATION;
+          }
+
+          // Next, for document navigation, check if this a non-remote child document.
+          bool checkSubDocument = true;
+          if (aForDocumentNavigation) {
+            nsIContent* docRoot = GetRootForChildDocument(currentContent);
+            if (docRoot) {
+              // If GetRootForChildDocument returned something then call
+              // FocusFirst to find the root or first element to focus within
+              // the child document. If this is a frameset though, skip this and
+              // fall through to the checkSubDocument block below to iterate into
+              // the frameset's frames and locate the first focusable frame.
+              if (!docRoot->IsHTMLElement(nsGkAtoms::frameset)) {
+                return FocusFirst(docRoot, aResultContent);
+              }
+            } else {
+              // Set checkSubDocument to false, as this was neither a frame
+              // type element or a child document that was focusable.
+              checkSubDocument = false;
+            }
+          }
+
+          if (checkSubDocument) {
+            // found a node with a matching tab index. Check if it is a child
+            // frame. If so, navigate into the child frame instead.
+            nsIDocument* doc = currentContent->GetComposedDoc();
+            NS_ASSERTION(doc, "content not in document");
+            nsIDocument* subdoc = doc->GetSubDocumentFor(currentContent);
+            if (subdoc && !subdoc->EventHandlingSuppressed()) {
+              if (aForward) {
+                // when tabbing forward into a frame, return the root
+                // frame so that the canvas becomes focused.
+                nsCOMPtr<nsPIDOMWindowOuter> subframe = subdoc->GetWindow();
+                if (subframe) {
+                  *aResultContent = GetRootForFocus(subframe, subdoc, false, true);
+                  if (*aResultContent) {
+                    NS_ADDREF(*aResultContent);
+                    return NS_OK;
+                  }
+                }
+              }
+              Element* rootElement = subdoc->GetRootElement();
+              nsIPresShell* subShell = subdoc->GetShell();
+              if (rootElement && subShell) {
+                rv = GetNextTabbableContent(subShell, rootElement,
+                                            aOriginalStartContent, rootElement,
+                                            aForward, (aForward ? 1 : 0),
+                                            false, aForDocumentNavigation, aResultContent);
+                NS_ENSURE_SUCCESS(rv, rv);
+                if (*aResultContent)
+                  return NS_OK;
+              }
+            }
+            // otherwise, use this as the next content node to tab to, unless
+            // this was the element we started on. This would happen for
+            // instance on an element with child frames, where frame navigation
+            // could return the original element again. In that case, just skip
+            // it. Also, if the next content node is the root content, then
+            // return it. This latter case would happen only if someone made a
+            // popup focusable.
+            // Also, when going backwards, check to ensure that the focus
+            // wouldn't be redirected. Otherwise, for example, when an input in
+            // a textbox is focused, the enclosing textbox would be found and
+            // the same inner input would be returned again.
+            else if (currentContent == aRootContent ||
+                     (currentContent != startContent &&
+                      (aForward || !GetRedirectedFocus(currentContent)))) {
+              NS_ADDREF(*aResultContent = currentContent);
+              return NS_OK;
+            }
+          }
+        }
+      }
+      else if (aOriginalStartContent && currentContent == aOriginalStartContent) {
+        // not focusable, so return if we have wrapped around to the original
+        // content. This is necessary in case the original starting content was
+        // not focusable.
+        NS_ADDREF(*aResultContent = currentContent);
+        return NS_OK;
+      }
+
+      // Move to the next or previous frame, but ignore continuation frames
+      // since only the first frame should be involved in focusability.
+      // Otherwise, a loop will occur in the following example:
+      //   <span tabindex="1">...<a/><a/>...</span>
+      // where the text wraps onto multiple lines. Tabbing from the second
+      // link can find one of the span's continuation frames between the link
+      // and the end of the span, and the span would end up getting focused
+      // again.
+      do {
+        if (aForward)
+          frameTraversal->Next();
+        else
+          frameTraversal->Prev();
+        frame = static_cast<nsIFrame*>(frameTraversal->CurrentItem());
+      } while (frame && frame->GetPrevContinuation());
+    }
+
+    // If already at lowest priority tab (0), end search completely.
+    // A bit counterintuitive but true, tabindex order goes 1, 2, ... 32767, 0
+    if (aCurrentTabIndex == (aForward ? 0 : 1)) {
+      // if going backwards, the canvas should be focused once the beginning
+      // has been reached, so get the root element.
+      if (!aForward) {
+        nsCOMPtr<nsPIDOMWindowOuter> window = GetCurrentWindow(aRootContent);
+        NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
+
+        nsCOMPtr<nsIContent> docRoot =
+          GetRootForFocus(window, aRootContent->GetComposedDoc(), false, true);
+        FocusFirst(docRoot, aResultContent);
+      }
+      break;
+    }
+
+    // continue looking for next highest priority tabindex
+    aCurrentTabIndex = GetNextTabIndex(aRootContent, aCurrentTabIndex, aForward);
+    startContent = iterStartContent = aRootContent;
+  }
+
+  return NS_OK;
+}
+
+nsIContent*
+nsFocusManager::GetNextTabbableMapArea(bool aForward,
+                                       int32_t aCurrentTabIndex,
+                                       nsIContent* aImageContent,
+                                       nsIContent* aStartContent)
+{
+  nsAutoString useMap;
+  aImageContent->GetAttr(kNameSpaceID_None, nsGkAtoms::usemap, useMap);
+
+  nsCOMPtr<nsIDocument> doc = aImageContent->GetComposedDoc();
+  if (doc) {
+    nsCOMPtr<nsIContent> mapContent = doc->FindImageMap(useMap);
+    if (!mapContent)
+      return nullptr;
+    uint32_t count = mapContent->GetChildCount();
+    // First see if the the start content is in this map
+
+    int32_t index = mapContent->IndexOf(aStartContent);
+    int32_t tabIndex;
+    if (index < 0 || (aStartContent->IsFocusable(&tabIndex) &&
+                      tabIndex != aCurrentTabIndex)) {
+      // If aStartContent is in this map we must start iterating past it.
+      // We skip the case where aStartContent has tabindex == aStartContent
+      // since the next tab ordered element might be before it
+      // (or after for backwards) in the child list.
+      index = aForward ? -1 : (int32_t)count;
+    }
+
+    // GetChildAt will return nullptr if our index < 0 or index >= count
+    nsCOMPtr<nsIContent> areaContent;
+    while ((areaContent = mapContent->GetChildAt(aForward ? ++index : --index)) != nullptr) {
+      if (areaContent->IsFocusable(&tabIndex) && tabIndex == aCurrentTabIndex) {
+        return areaContent;
+      }
+    }
+  }
+
+  return nullptr;
+}
+
+int32_t
+nsFocusManager::GetNextTabIndex(nsIContent* aParent,
+                                int32_t aCurrentTabIndex,
+                                bool aForward)
+{
+  int32_t tabIndex, childTabIndex;
+
+  if (aForward) {
+    tabIndex = 0;
+    for (nsIContent* child = aParent->GetFirstChild();
+         child;
+         child = child->GetNextSibling()) {
+      childTabIndex = GetNextTabIndex(child, aCurrentTabIndex, aForward);
+      if (childTabIndex > aCurrentTabIndex && childTabIndex != tabIndex) {
+        tabIndex = (tabIndex == 0 || childTabIndex < tabIndex) ? childTabIndex : tabIndex;
+      }
+
+      nsAutoString tabIndexStr;
+      child->GetAttr(kNameSpaceID_None, nsGkAtoms::tabindex, tabIndexStr);
+      nsresult ec;
+      int32_t val = tabIndexStr.ToInteger(&ec);
+      if (NS_SUCCEEDED (ec) && val > aCurrentTabIndex && val != tabIndex) {
+        tabIndex = (tabIndex == 0 || val < tabIndex) ? val : tabIndex;
+      }
+    }
+  }
+  else { /* !aForward */
+    tabIndex = 1;
+    for (nsIContent* child = aParent->GetFirstChild();
+         child;
+         child = child->GetNextSibling()) {
+      childTabIndex = GetNextTabIndex(child, aCurrentTabIndex, aForward);
+      if ((aCurrentTabIndex == 0 && childTabIndex > tabIndex) ||
+          (childTabIndex < aCurrentTabIndex && childTabIndex > tabIndex)) {
+        tabIndex = childTabIndex;
+      }
+
+      nsAutoString tabIndexStr;
+      child->GetAttr(kNameSpaceID_None, nsGkAtoms::tabindex, tabIndexStr);
+      nsresult ec;
+      int32_t val = tabIndexStr.ToInteger(&ec);
+      if (NS_SUCCEEDED (ec)) {
+        if ((aCurrentTabIndex == 0 && val > tabIndex) ||
+            (val < aCurrentTabIndex && val > tabIndex) ) {
+          tabIndex = val;
+        }
+      }
+    }
+  }
+
+  return tabIndex;
+}
+
+nsresult
+nsFocusManager::FocusFirst(nsIContent* aRootContent, nsIContent** aNextContent)
+{
+  if (!aRootContent) {
+    return NS_OK;
+  }
+
+  nsIDocument* doc = aRootContent->GetComposedDoc();
+  if (doc) {
+    if (doc->IsXULDocument()) {
+      // If the redirectdocumentfocus attribute is set, redirect the focus to a
+      // specific element. This is primarily used to retarget the focus to the
+      // urlbar during document navigation.
+      nsAutoString retarget;
+
+      if (aRootContent->GetAttr(kNameSpaceID_None,
+                               nsGkAtoms::retargetdocumentfocus, retarget)) {
+        nsCOMPtr<Element> element = doc->GetElementById(retarget);
+        nsCOMPtr<nsIContent> retargetElement =
+          CheckIfFocusable(element, 0);
+        if (retargetElement) {
+          retargetElement.forget(aNextContent);
+          return NS_OK;
+        }
+      }
+    }
+
+    nsCOMPtr<nsIDocShell> docShell = doc->GetDocShell();
+    if (docShell->ItemType() == nsIDocShellTreeItem::typeChrome) {
+      // If the found content is in a chrome shell, navigate forward one
+      // tabbable item so that the first item is focused. Note that we
+      // always go forward and not back here.
+      nsIPresShell* presShell = doc->GetShell();
+      if (presShell) {
+        return GetNextTabbableContent(presShell, aRootContent,
+                                      nullptr, aRootContent,
+                                      true, 1, false, false,
+                                      aNextContent);
+      }
+    }
+  }
+
+  NS_ADDREF(*aNextContent = aRootContent);
+  return NS_OK;
+}
+
+nsIContent*
+nsFocusManager::GetRootForFocus(nsPIDOMWindowOuter* aWindow,
+                                nsIDocument* aDocument,
+                                bool aForDocumentNavigation,
+                                bool aCheckVisibility)
+{
+  if (!aForDocumentNavigation) {
+    nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
+    if (docShell->ItemType() == nsIDocShellTreeItem::typeChrome) {
+      return nullptr;
+    }
+  }
+
+  if (aCheckVisibility && !IsWindowVisible(aWindow))
+    return nullptr;
+
+  // If the body is contenteditable, use the editor's root element rather than
+  // the actual root element.
+  nsCOMPtr<nsIContent> rootElement =
+    nsLayoutUtils::GetEditableRootContentByContentEditable(aDocument);
+  if (!rootElement || !rootElement->GetPrimaryFrame()) {
+    rootElement = aDocument->GetRootElement();
+    if (!rootElement) {
+      return nullptr;
+    }
+  }
+
+  if (aCheckVisibility && !rootElement->GetPrimaryFrame()) {
+    return nullptr;
+  }
+
+  // Finally, check if this is a frameset
+  nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(aDocument);
+  if (htmlDoc) {
+    nsIContent* htmlChild = aDocument->GetHtmlChildElement(nsGkAtoms::frameset);
+    if (htmlChild) {
+      // In document navigation mode, return the frameset so that navigation
+      // descends into the child frames.
+      return aForDocumentNavigation ? htmlChild : nullptr;
+    }
+  }
+
+  return rootElement;
+}
+
+nsIContent*
+nsFocusManager::GetRootForChildDocument(nsIContent* aContent)
+{
+  // Check for elements that represent child documents, that is, browsers,
+  // editors or frames from a frameset. We don't include iframes since we
+  // consider them to be an integral part of the same window or page.
+  if (!aContent ||
+      !(aContent->IsXULElement(nsGkAtoms::browser) ||
+        aContent->IsXULElement(nsGkAtoms::editor) ||
+        aContent->IsHTMLElement(nsGkAtoms::frame))) {
+    return nullptr;
+  }
+
+  nsIDocument* doc = aContent->GetComposedDoc();
+  if (!doc) {
+    return nullptr;
+  }
+
+  nsIDocument* subdoc = doc->GetSubDocumentFor(aContent);
+  if (!subdoc || subdoc->EventHandlingSuppressed()) {
+    return nullptr;
+  }
+
+  nsCOMPtr<nsPIDOMWindowOuter> window = subdoc->GetWindow();
+  return GetRootForFocus(window, subdoc, true, true);
+}
+
+void
+nsFocusManager::GetFocusInSelection(nsPIDOMWindowOuter* aWindow,
+                                    nsIContent* aStartSelection,
+                                    nsIContent* aEndSelection,
+                                    nsIContent** aFocusedContent)
+{
+  *aFocusedContent = nullptr;
+
+  nsCOMPtr<nsIContent> testContent = aStartSelection;
+  nsCOMPtr<nsIContent> nextTestContent = aEndSelection;
+
+  nsCOMPtr<nsIContent> currentFocus = aWindow->GetFocusedNode();
+
+  // We now have the correct start node in selectionContent!
+  // Search for focusable elements, starting with selectionContent
+
+  // Method #1: Keep going up while we look - an ancestor might be focusable
+  // We could end the loop earlier, such as when we're no longer
+  // in the same frame, by comparing selectionContent->GetPrimaryFrame()
+  // with a variable holding the starting selectionContent
+  while (testContent) {
+    // Keep testing while selectionContent is equal to something,
+    // eventually we'll run out of ancestors
+
+    nsCOMPtr<nsIURI> uri;
+    if (testContent == currentFocus ||
+        testContent->IsLink(getter_AddRefs(uri))) {
+      testContent.forget(aFocusedContent);
+      return;
+    }
+
+    // Get the parent
+    testContent = testContent->GetParent();
+
+    if (!testContent) {
+      // We run this loop again, checking the ancestor chain of the selection's end point
+      testContent = nextTestContent;
+      nextTestContent = nullptr;
+    }
+  }
+
+  // We couldn't find an anchor that was an ancestor of the selection start
+  // Method #2: look for anchor in selection's primary range (depth first search)
+
+  // Turn into nodes so that we can use GetNextSibling() and GetFirstChild()
+  nsCOMPtr<nsIDOMNode> selectionNode(do_QueryInterface(aStartSelection));
+  nsCOMPtr<nsIDOMNode> endSelectionNode(do_QueryInterface(aEndSelection));
+  nsCOMPtr<nsIDOMNode> testNode;
+
+  do {
+    testContent = do_QueryInterface(selectionNode);
+
+    // We're looking for any focusable link that could be part of the
+    // main document's selection.
+    nsCOMPtr<nsIURI> uri;
+    if (testContent == currentFocus ||
+        testContent->IsLink(getter_AddRefs(uri))) {
+      testContent.forget(aFocusedContent);
+      return;
+    }
+
+    selectionNode->GetFirstChild(getter_AddRefs(testNode));
+    if (testNode) {
+      selectionNode = testNode;
+      continue;
+    }
+
+    if (selectionNode == endSelectionNode)
+      break;
+    selectionNode->GetNextSibling(getter_AddRefs(testNode));
+    if (testNode) {
+      selectionNode = testNode;
+      continue;
+    }
+
+    do {
+      selectionNode->GetParentNode(getter_AddRefs(testNode));
+      if (!testNode || testNode == endSelectionNode) {
+        selectionNode = nullptr;
+        break;
+      }
+      testNode->GetNextSibling(getter_AddRefs(selectionNode));
+      if (selectionNode)
+        break;
+      selectionNode = testNode;
+    } while (true);
+  }
+  while (selectionNode && selectionNode != endSelectionNode);
+}
+
+class PointerUnlocker : public Runnable
+{
+public:
+  PointerUnlocker()
+  {
+    MOZ_ASSERT(!PointerUnlocker::sActiveUnlocker);
+    PointerUnlocker::sActiveUnlocker = this;
+  }
+
+  ~PointerUnlocker()
+  {
+    if (PointerUnlocker::sActiveUnlocker == this) {
+      PointerUnlocker::sActiveUnlocker = nullptr;
+    }
+  }
+
+  NS_IMETHOD Run() override
+  {
+    if (PointerUnlocker::sActiveUnlocker == this) {
+      PointerUnlocker::sActiveUnlocker = nullptr;
+    }
+    NS_ENSURE_STATE(nsFocusManager::GetFocusManager());
+    nsPIDOMWindowOuter* focused =
+      nsFocusManager::GetFocusManager()->GetFocusedWindow();
+    nsCOMPtr<nsIDocument> pointerLockedDoc =
+      do_QueryReferent(EventStateManager::sPointerLockedDoc);
+    if (pointerLockedDoc &&
+        !nsContentUtils::IsInPointerLockContext(focused)) {
+      nsIDocument::UnlockPointer();
+    }
+    return NS_OK;
+  }
+
+  static PointerUnlocker* sActiveUnlocker;
+};
+
+PointerUnlocker*
+PointerUnlocker::sActiveUnlocker = nullptr;
+
+void
+nsFocusManager::SetFocusedWindowInternal(nsPIDOMWindowOuter* aWindow)
+{
+  if (!PointerUnlocker::sActiveUnlocker &&
+      nsContentUtils::IsInPointerLockContext(mFocusedWindow) &&
+      !nsContentUtils::IsInPointerLockContext(aWindow)) {
+    nsCOMPtr<nsIRunnable> runnable = new PointerUnlocker();
+    NS_DispatchToCurrentThread(runnable);
+  }
+  mFocusedWindow = aWindow;
+}
+
+void
+nsFocusManager::MarkUncollectableForCCGeneration(uint32_t aGeneration)
+{
+  if (!sInstance) {
+    return;
+  }
+
+  if (sInstance->mActiveWindow) {
+    sInstance->mActiveWindow->
+      MarkUncollectableForCCGeneration(aGeneration);
+  }
+  if (sInstance->mFocusedWindow) {
+    sInstance->mFocusedWindow->
+      MarkUncollectableForCCGeneration(aGeneration);
+  }
+  if (sInstance->mWindowBeingLowered) {
+    sInstance->mWindowBeingLowered->
+      MarkUncollectableForCCGeneration(aGeneration);
+  }
+  if (sInstance->mFocusedContent) {
+    sInstance->mFocusedContent->OwnerDoc()->
+      MarkUncollectableForCCGeneration(aGeneration);
+  }
+  if (sInstance->mFirstBlurEvent) {
+    sInstance->mFirstBlurEvent->OwnerDoc()->
+      MarkUncollectableForCCGeneration(aGeneration);
+  }
+  if (sInstance->mFirstFocusEvent) {
+    sInstance->mFirstFocusEvent->OwnerDoc()->
+      MarkUncollectableForCCGeneration(aGeneration);
+  }
+  if (sInstance->mMouseButtonEventHandlingDocument) {
+    sInstance->mMouseButtonEventHandlingDocument->
+      MarkUncollectableForCCGeneration(aGeneration);
+  }
+}
+
+nsresult
+NS_NewFocusManager(nsIFocusManager** aResult)
+{
+  NS_IF_ADDREF(*aResult = nsFocusManager::GetFocusManager());
+  return NS_OK;
+}