--- a/widget/cocoa/nsCocoaWindow.mm
+++ b/widget/cocoa/nsCocoaWindow.mm
@@ -3492,17 +3492,16 @@ static const NSString* kStateCollectionB
 // cover the titlebar completely and nothing that happens in the window
 // background will reach the screen.
 @implementation ToolbarWindow
 
 - (id)initWithContentRect:(NSRect)aContentRect styleMask:(NSUInteger)aStyle backing:(NSBackingStoreType)aBufferingType defer:(BOOL)aFlag
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
 
-  aStyle = aStyle | NSTexturedBackgroundWindowMask;
   if ((self = [super initWithContentRect:aContentRect styleMask:aStyle backing:aBufferingType defer:aFlag])) {
     mUnifiedToolbarHeight = 22.0f;
     mSheetAttachmentPosition = aContentRect.size.height;
     mWindowButtonsRect = NSZeroRect;
     mFullScreenButtonRect = NSZeroRect;
 
     // setBottomCornerRounded: is a private API call, so we check to make sure
     // we respond to it just in case.