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diff --git a/widget/cocoa/nsMenuX.h b/widget/cocoa/nsMenuX.h
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+++ b/widget/cocoa/nsMenuX.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsMenuX_h_
+#define nsMenuX_h_
+
+#import <Cocoa/Cocoa.h>
+
+#include "mozilla/EventForwards.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Variant.h"
+#include "nsISupports.h"
+#include "nsMenuParentX.h"
+#include "nsMenuBarX.h"
+#include "nsMenuGroupOwnerX.h"
+#include "nsMenuItemIconX.h"
+#include "nsCOMPtr.h"
+#include "nsChangeObserver.h"
+#include "nsThreadUtils.h"
+
+class nsMenuX;
+class nsMenuItemX;
+class nsIWidget;
+
+// MenuDelegate is used to receive Cocoa notifications for setting
+// up carbon events. Protocol is defined as of 10.6 SDK.
+@interface MenuDelegate : NSObject <NSMenuDelegate> {
+  nsMenuX* mGeckoMenu;  // weak ref
+  NSMutableArray* mBlocksToRunWhenOpen;
+}
+- (id)initWithGeckoMenu:(nsMenuX*)geckoMenu;
+- (void)runBlockWhenOpen:(void (^)())block;
+- (void)menu:(NSMenu*)menu willActivateItem:(NSMenuItem*)item;
+@end
+
+class nsMenuXObserver {
+ public:
+  // Called when a menu in this menu subtree opens, before popupshowing.
+  // No strong reference is held to the observer during the call.
+  virtual void OnMenuWillOpen(mozilla::dom::Element* aPopupElement) = 0;
+
+  // Called when a menu in this menu subtree opened, after popupshown.
+  // No strong reference is held to the observer during the call.
+  virtual void OnMenuDidOpen(mozilla::dom::Element* aPopupElement) = 0;
+
+  // Called before a menu item is activated.
+  virtual void OnMenuWillActivateItem(
+      mozilla::dom::Element* aPopupElement,
+      mozilla::dom::Element* aMenuItemElement) = 0;
+
+  // Called when a menu in this menu subtree closed, after popuphidden.
+  // No strong reference is held to the observer during the call.
+  virtual void OnMenuClosed(mozilla::dom::Element* aPopupElement) = 0;
+};
+
+// Once instantiated, this object lives until its DOM node or its parent window
+// is destroyed. Do not hold references to this, they can become invalid any
+// time the DOM node can be destroyed.
+class nsMenuX final : public nsMenuParentX,
+                      public nsChangeObserver,
+                      public nsMenuItemIconX::Listener,
+                      public nsMenuXObserver {
+ public:
+  using Observer = nsMenuXObserver;
+
+  // aParent is optional.
+  nsMenuX(nsMenuParentX* aParent, nsMenuGroupOwnerX* aMenuGroupOwner,
+          nsIContent* aContent);
+
+  NS_INLINE_DECL_REFCOUNTING(nsMenuX)
+
+  // If > 0, the OS is indexing all the app's menus (triggered by opening
+  // Help menu on Leopard and higher).  There are some things that are
+  // unsafe to do while this is happening.
+  static int32_t sIndexingMenuLevel;
+
+  NS_DECL_CHANGEOBSERVER
+
+  // nsMenuItemIconX::Listener
+  void IconUpdated() override;
+
+  // nsMenuXObserver, to forward notifications from our children to our
+  // observer.
+  void OnMenuWillOpen(mozilla::dom::Element* aPopupElement) override;
+  void OnMenuDidOpen(mozilla::dom::Element* aPopupElement) override;
+  void OnMenuWillActivateItem(mozilla::dom::Element* aPopupElement,
+                              mozilla::dom::Element* aMenuItemElement) override;
+  void OnMenuClosed(mozilla::dom::Element* aPopupElement) override;
+
+  bool IsVisible() const { return mVisible; }
+
+  // Unregisters nsMenuX from the nsMenuGroupOwner, and nulls out the group
+  // owner pointer, on this nsMenuX and also all nested nsMenuX and nsMenuItemX
+  // objects. This is needed because nsMenuX is reference-counted and can
+  // outlive its owner, and the menu group owner asserts that everything has
+  // been unregistered when it is destroyed.
+  void DetachFromGroupOwnerRecursive();
+
+  // Nulls out our reference to the parent.
+  // This is needed because nsMenuX is reference-counted and can outlive its
+  // parent.
+  void DetachFromParent() { mParent = nullptr; }
+
+  mozilla::Maybe<MenuChild> GetItemAt(uint32_t aPos);
+  uint32_t GetItemCount();
+
+  mozilla::Maybe<MenuChild> GetVisibleItemAt(uint32_t aPos);
+  nsresult GetVisibleItemCount(uint32_t& aCount);
+
+  mozilla::Maybe<MenuChild> GetItemForElement(
+      mozilla::dom::Element* aMenuChildElement);
+
+  // Asynchronously runs the command event on aItem, after the root menu has
+  // closed.
+  void ActivateItemAfterClosing(RefPtr<nsMenuItemX>&& aItem,
+                                NSEventModifierFlags aModifiers,
+                                int16_t aButton);
+
+  bool IsOpenForGecko() const { return mIsOpenForGecko; }
+
+  // Fires the popupshowing event and returns whether the handler allows the
+  // popup to open. When calling this method, the caller must hold a strong
+  // reference to this object, because other references to this object can be
+  // dropped during the handling of the DOM event.
+  MOZ_CAN_RUN_SCRIPT bool OnOpen();
+
+  void PopupShowingEventWasSentAndApprovedExternally() {
+    DidFirePopupShowing();
+  }
+
+  // Called from the menu delegate during menuWillOpen, or to simulate opening.
+  // Ignored if the menu is already considered open.
+  // When calling this method, the caller must hold a strong reference to this
+  // object, because other references to this object can be dropped during the
+  // handling of the DOM event.
+  // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230)
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void MenuOpened();
+
+  // Called from the menu delegate during menuDidClose, or to simulate closing.
+  // Ignored if the menu is already considered closed.
+  // When calling this method, the caller must hold a strong reference to this
+  // object, because other references to this object can be dropped during the
+  // handling of the DOM event.
+  void MenuClosed();
+
+  // Close the menu if it's open, and flush any pending popuphiding /
+  // popuphidden events.
+  bool Close();
+
+  // Called from the menu delegate during menu:willHighlightItem:.
+  // If called with Nothing(), it means that no item is highlighted.
+  // The index only accounts for visible items, i.e. items for which there
+  // exists an NSMenuItem* in mNativeMenu.
+  void OnHighlightedItemChanged(
+      const mozilla::Maybe<uint32_t>& aNewHighlightedIndex);
+
+  // Called from the menu delegate before an item anywhere in this menu is
+  // activated. Called after MenuClosed().
+  void OnWillActivateItem(NSMenuItem* aItem);
+
+  void SetRebuild(bool aMenuEvent);
+  void SetupIcon();
+  nsIContent* Content() { return mContent; }
+  NSMenuItem* NativeNSMenuItem() { return mNativeMenuItem; }
+  GeckoNSMenu* NativeNSMenu() { return mNativeMenu; }
+
+  void SetIconListener(nsMenuItemIconX::Listener* aListener) {
+    mIconListener = aListener;
+  }
+  void ClearIconListener() { mIconListener = nullptr; }
+
+  // nsMenuParentX
+  void MenuChildChangedVisibility(const MenuChild& aChild,
+                                  bool aIsVisible) override;
+
+  void Dump(uint32_t aIndent) const;
+
+  static bool IsXULHelpMenu(nsIContent* aMenuContent);
+  static bool IsXULWindowMenu(nsIContent* aMenuContent);
+
+  // Set an observer that gets notified of menu opening and closing.
+  // The menu does not keep a strong reference the observer. The observer must
+  // remove itself before it is destroyed.
+  void SetObserver(Observer* aObserver) { mObserver = aObserver; }
+
+  // Stop observing.
+  void ClearObserver() { mObserver = nullptr; }
+
+ protected:
+  virtual ~nsMenuX();
+
+  void RebuildMenu();
+  nsresult RemoveAll();
+  nsresult SetEnabled(bool aIsEnabled);
+  nsresult GetEnabled(bool* aIsEnabled);
+  already_AddRefed<nsIContent> GetMenuPopupContent();
+  void WillInsertChild(const MenuChild& aChild);
+  void WillRemoveChild(const MenuChild& aChild);
+  void AddMenuChild(MenuChild&& aChild);
+  void InsertMenuChild(MenuChild&& aChild);
+  void RemoveMenuChild(const MenuChild& aChild);
+  mozilla::Maybe<MenuChild> CreateMenuChild(nsIContent* aContent);
+  RefPtr<nsMenuItemX> CreateMenuItem(nsIContent* aMenuItemContent);
+  GeckoNSMenu* CreateMenuWithGeckoString(nsString& aMenuTitle,
+                                         bool aShowServices);
+  void DidFirePopupShowing();
+
+  // Find the index at which aChild needs to be inserted into mMenuChildren such
+  // that mMenuChildren remains in correct content order, i.e. the order in
+  // mMenuChildren is the same as the order of the DOM children of our
+  // <menupopup>.
+  size_t FindInsertionIndex(const MenuChild& aChild);
+
+  // Calculates the index at which aChild's NSMenuItem should be inserted into
+  // our NSMenu. The order of NSMenuItems in the NSMenu is the same as the order
+  // of menu children in mMenuChildren; the only difference is that
+  // mMenuChildren contains both visible and invisible children, and the NSMenu
+  // only contains visible items. So the insertion index is equal to the number
+  // of visible previous siblings of aChild in mMenuChildren.
+  NSInteger CalculateNativeInsertionPoint(const MenuChild& aChild);
+
+  // Fires the popupshown event.
+  MOZ_CAN_RUN_SCRIPT void MenuOpenedAsync();
+
+  // Called from mPendingAsyncMenuCloseRunnable asynchronously after
+  // MenuClosed(), so that it runs after any potential menuItemHit calls for
+  // clicked menu items. Fires popuphiding and popuphidden events. When calling
+  // this method, the caller must hold a strong reference to this object,
+  // because other references to this object can be dropped during the handling
+  // of the DOM event.
+  MOZ_CAN_RUN_SCRIPT void MenuClosedAsync();
+
+  // If mPendingAsyncMenuOpenRunnable is non-null, call MenuOpenedAsync() to
+  // send out the pending popupshown event.
+  // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230)
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void FlushMenuOpenedRunnable();
+
+  // If mPendingAsyncMenuCloseRunnable is non-null, call MenuClosedAsync() to
+  // send out pending popuphiding/popuphidden events.
+  // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230)
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void FlushMenuClosedRunnable();
+
+  // Make sure the NSMenu contains at least one item, even if mVisibleItemsCount
+  // is zero. Otherwise it won't open.
+  void InsertPlaceholderIfNeeded();
+  // Remove the placeholder before adding an item to mNativeNSMenu.
+  void RemovePlaceholderIfPresent();
+
+  nsCOMPtr<nsIContent> mContent;  // XUL <menu> or <menupopup>
+
+  // Contains nsMenuX and nsMenuItemX objects
+  nsTArray<MenuChild> mMenuChildren;
+
+  nsString mLabel;
+  uint32_t mVisibleItemsCount = 0;                     // cache
+  nsMenuParentX* mParent = nullptr;                    // [weak]
+  nsMenuGroupOwnerX* mMenuGroupOwner = nullptr;        // [weak]
+  nsMenuItemIconX::Listener* mIconListener = nullptr;  // [weak]
+  mozilla::UniquePtr<nsMenuItemIconX> mIcon;
+
+  Observer* mObserver = nullptr;  // non-owning pointer to our observer
+
+  // Non-null between a call to MenuOpened() and MenuOpenedAsync().
+  RefPtr<mozilla::CancelableRunnable> mPendingAsyncMenuOpenRunnable;
+
+  // Non-null between a call to MenuClosed() and MenuClosedAsync().
+  // This is asynchronous so that, if a menu item is clicked, we can fire
+  // popuphiding *after* we execute the menu item command. The macOS menu system
+  // calls menuWillClose *before* it calls menuItemHit.
+  RefPtr<mozilla::CancelableRunnable> mPendingAsyncMenuCloseRunnable;
+
+  struct PendingCommandEvent {
+    RefPtr<nsMenuItemX> mMenuItem;
+    NSEventModifierFlags mModifiers;
+    int16_t mButton;
+  };
+
+  // Any pending command events.
+  // These are queued by ActivateItemAfterClosing and run by MenuClosedAsync.
+  nsTArray<PendingCommandEvent> mPendingCommandEvents;
+
+  GeckoNSMenu* mNativeMenu = nil;     // [strong]
+  MenuDelegate* mMenuDelegate = nil;  // [strong]
+  // nsMenuX objects should always have a valid native menu item.
+  NSMenuItem* mNativeMenuItem = nil;  // [strong]
+
+  // Nothing() if no item is highlighted. The index only accounts for visible
+  // items.
+  mozilla::Maybe<uint32_t> mHighlightedItemIndex;
+
+  bool mIsEnabled = true;
+  bool mNeedsRebuild = true;
+
+  // Whether the native NSMenu is considered open.
+  // Also affected by MenuOpened() / MenuClosed() calls for simulated opening /
+  // closing.
+  bool mIsOpen = false;
+
+  // Whether the popup is open from Gecko's perspective, based on popupshowing /
+  // popuphiding events.
+  bool mIsOpenForGecko = false;
+
+  bool mVisible = true;
+
+  // true between an OnOpen() call that returned true, and the subsequent call
+  // to MenuOpened().
+  bool mDidFirePopupshowingAndIsApprovedToOpen = false;
+};
+
+#endif  // nsMenuX_h_