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diff --git a/accessible/base/FocusManager.h b/accessible/base/FocusManager.h
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+++ b/accessible/base/FocusManager.h
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_a11y_FocusManager_h_
+#define mozilla_a11y_FocusManager_h_
+
+#include "mozilla/RefPtr.h"
+
+class nsINode;
+class nsISupports;
+
+namespace mozilla {
+namespace dom {
+class Document;
+}
+
+namespace a11y {
+
+class Accessible;
+class AccEvent;
+class LocalAccessible;
+class DocAccessible;
+class DocAccessibleParent;
+
+/**
+ * Manage the accessible focus. Used to fire and process accessible events.
+ */
+class FocusManager {
+ public:
+  virtual ~FocusManager();
+
+  /**
+   * Return the currently focused LocalAccessible. If a remote document has
+   * focus, this will return null.
+   */
+  LocalAccessible* FocusedLocalAccessible() const;
+
+  /**
+   * Return the currently focused Accessible, local or remote.
+   */
+  Accessible* FocusedAccessible() const;
+
+  /**
+   * Return true if given accessible is focused.
+   */
+  bool IsFocused(const Accessible* aAccessible) const {
+    return FocusedAccessible() == aAccessible;
+  }
+
+  /**
+   * Return true if the given accessible is an active item, i.e. an item that
+   * is current within the active widget.
+   */
+  inline bool IsActiveItem(const LocalAccessible* aAccessible) {
+    return aAccessible == mActiveItem;
+  }
+
+  /**
+   * Return DOM node having DOM focus.
+   */
+  nsINode* FocusedDOMNode() const;
+
+  /**
+   * Return true if given DOM node has DOM focus.
+   */
+  inline bool HasDOMFocus(const nsINode* aNode) const {
+    return aNode == FocusedDOMNode();
+  }
+
+  /**
+   * Return true if focused accessible is within the given container.
+   */
+  bool IsFocusWithin(const Accessible* aContainer) const;
+
+  /**
+   * Return whether the given accessible is focused or contains the focus or
+   * contained by focused accessible.
+   */
+  enum FocusDisposition { eNone, eFocused, eContainsFocus, eContainedByFocus };
+  FocusDisposition IsInOrContainsFocus(
+      const LocalAccessible* aAccessible) const;
+
+  /**
+   * Return true if the given accessible was the last accessible focused.
+   * This is useful to detect the case where the last focused accessible was
+   * removed before something else was focused. This can happen in one of two
+   * ways:
+   * 1. The DOM focus was removed. DOM doesn't fire a blur event when this
+   *    happens; see bug 559561.
+   * 2. The accessibility focus was an active item (e.g. aria-activedescendant)
+   *    and that item was removed.
+   */
+  bool WasLastFocused(const LocalAccessible* aAccessible) const;
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Focus notifications and processing (don't use until you know what you do).
+
+  /**
+   * Called when DOM focus event is fired.
+   */
+  void NotifyOfDOMFocus(nsISupports* aTarget);
+
+  /**
+   * Called when DOM blur event is fired.
+   */
+  void NotifyOfDOMBlur(nsISupports* aTarget);
+
+  /**
+   * Called when active item is changed. Note: must be called when accessible
+   * tree is up to date.
+   */
+  void ActiveItemChanged(LocalAccessible* aItem, bool aCheckIfActive = true);
+
+  /**
+   * Dispatch delayed focus event for the current focus accessible.
+   */
+  void ForceFocusEvent();
+
+  /**
+   * Dispatch delayed focus event for the given target.
+   */
+  void DispatchFocusEvent(DocAccessible* aDocument, LocalAccessible* aTarget);
+
+  /**
+   * Process DOM focus notification.
+   */
+  void ProcessDOMFocus(nsINode* aTarget);
+
+  /**
+   * Process the delayed accessible event.
+   * do.
+   */
+  void ProcessFocusEvent(AccEvent* aEvent);
+
+#ifdef ANDROID
+  void SetFocusedRemoteDoc(DocAccessibleParent* aDoc) {
+    mFocusedRemoteDoc = aDoc;
+  }
+  bool IsFocusedRemoteDoc(DocAccessibleParent* aDoc) {
+    return mFocusedRemoteDoc == aDoc;
+  }
+#endif
+
+ protected:
+  FocusManager();
+
+ private:
+  FocusManager(const FocusManager&);
+  FocusManager& operator=(const FocusManager&);
+
+  /**
+   * Return DOM document having DOM focus.
+   */
+  dom::Document* FocusedDOMDocument() const;
+
+ private:
+  RefPtr<LocalAccessible> mActiveItem;
+  RefPtr<LocalAccessible> mLastFocus;
+  RefPtr<LocalAccessible> mActiveARIAMenubar;
+#ifdef ANDROID
+  DocAccessibleParent* mFocusedRemoteDoc = nullptr;
+#endif
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif