diff --git a/widget/cocoa/nsCocoaWindow.h b/widget/cocoa/nsCocoaWindow.h
index 312011c1c2ac41e78affecbdef25d72766a7c882..e5865c7d6259f0a3df48edf7a26b1b75a23cdb3a 100644
--- a/widget/cocoa/nsCocoaWindow.h
+++ b/widget/cocoa/nsCocoaWindow.h
@@ -462,6 +462,10 @@ class nsCocoaWindow final : public nsIWidget {
   void SetHideTitlebarSeparator(bool) override;
   bool IsMacTitlebarDirectionRTL() override;
   void SetCustomTitlebar(bool) override;
+  void SetWindowClass(const nsAString& aXulWinType,
+                      const nsAString& aXulWinClass,
+                      const nsAString& aXulWinName) override;
+  void UpdateWindowMaterial();
   void UpdateThemeGeometries(
       const nsTArray<ThemeGeometry>& aThemeGeometries) override;
   void LockAspectRatio(bool aShouldLock) override;
@@ -672,6 +676,7 @@ class nsCocoaWindow final : public nsIWidget {
   bool mAspectRatioLocked = false;
   bool mIsAlert = false;  // True if this is an non-native alert window.
   bool mWasShown = false;
+  bool mIsBrowserWindow = false;
 
   int32_t mNumModalDescendants = 0;