--- a/widget/cocoa/nsCocoaWindow.h
+++ b/widget/cocoa/nsCocoaWindow.h
@@ -173,17 +173,16 @@ typedef struct _nsCocoaWindowList {
 @end
 
 // NSWindow subclass for handling windows with toolbars.
 @interface ToolbarWindow : BaseWindow
 {
   TitlebarAndBackgroundColor *mColor; // strong
   CGFloat mUnifiedToolbarHeight;
   NSColor *mBackgroundColor; // strong
-  NSView *mTitlebarView; // strong
   NSRect mWindowButtonsRect;
   NSRect mFullScreenButtonRect;
 }
 // Pass nil here to get the default appearance.
 - (void)setTitlebarColor:(NSColor*)aColor forActiveWindow:(BOOL)aActive;
 - (void)setUnifiedToolbarHeight:(CGFloat)aHeight;
 - (CGFloat)unifiedToolbarHeight;
 - (CGFloat)titlebarHeight;

--- a/widget/cocoa/nsCocoaWindow.mm
+++ b/widget/cocoa/nsCocoaWindow.mm
@@ -3599,17 +3599,16 @@ static const NSString* kStateCollectionB
 
 - (void)dealloc
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
 
   [super setBackgroundColor:[NSColor whiteColor]];
   [mColor release];
   [mBackgroundColor release];
-  [mTitlebarView release];
   [super dealloc];
 
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 
 - (void)setTitlebarColor:(NSColor*)aColor forActiveWindow:(BOOL)aActive
 {
   [super setTitlebarColor:aColor forActiveWindow:aActive];