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diff --git a/widget/cocoa/nsMenuUtilsX.h b/widget/cocoa/nsMenuUtilsX.h
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+++ b/widget/cocoa/nsMenuUtilsX.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 nsMenuUtilsX_h_
+#define nsMenuUtilsX_h_
+
+#include "nscore.h"
+#include "nsStringFwd.h"
+
+#import <Cocoa/Cocoa.h>
+
+class nsIContent;
+class nsMenuBarX;
+class nsMenuX;
+
+// Namespace containing utility functions used in our native menu implementation.
+namespace nsMenuUtilsX {
+void DispatchCommandTo(nsIContent* aTargetContent, NSEventModifierFlags aModifierFlags,
+                       int16_t aButton);
+NSString* GetTruncatedCocoaLabel(const nsString& itemLabel);
+uint8_t GeckoModifiersForNodeAttribute(const nsString& modifiersAttribute);
+unsigned int MacModifiersForGeckoModifiers(uint8_t geckoModifiers);
+nsMenuBarX* GetHiddenWindowMenuBar();   // returned object is not retained
+NSMenuItem* GetStandardEditMenuItem();  // returned object is not retained
+bool NodeIsHiddenOrCollapsed(nsIContent* aContent);
+
+// Find the menu item by following the path aLocationString from aRootMenu.
+// aLocationString is a '|'-separated list of integers, where each integer is
+// the index of the menu item in the menu.
+// aIsMenuBar needs to be true if aRootMenu is the app's mainMenu, so that the
+// app menu can be skipped during the search.
+NSMenuItem* NativeMenuItemWithLocation(NSMenu* aRootMenu, NSString* aLocationString,
+                                       bool aIsMenuBar);
+
+// Traverse the menu tree and check that there are no cycles or NSMenu(Item) objects that are used
+// more than once. If inconsistencies are found, these functions crash the process.
+void CheckNativeMenuConsistency(NSMenu* aMenu);
+void CheckNativeMenuConsistency(NSMenuItem* aMenuItem);
+
+// Print out debugging information about the native menu tree structure.
+void DumpNativeMenu(NSMenu* aMenu);
+void DumpNativeMenuItem(NSMenuItem* aMenuItem);
+
+extern bool gIsSynchronouslyActivatingNativeMenuItemDuringTest;
+
+}  // namespace nsMenuUtilsX
+
+#endif  // nsMenuUtilsX_h_