Bug 547723 - Turn off menu background blurring on PPC because it results in blank menus. r=josh

widget/src/cocoa/nsCocoaWindow.mm

@@ -866,9 +866,12 @@ nsCocoaWindow::SetUpWindowFilter()
 
   CleanUpWindowFilter();
 
-  // Only blur the background of menus and fake sheets.
+  // Only blur the background of menus and fake sheets, but not on PPC
+  // because it results in blank windows (bug 547723).
+#ifndef __ppc__
   if (mShadowStyle != NS_STYLE_WINDOW_SHADOW_MENU &&
       mShadowStyle != NS_STYLE_WINDOW_SHADOW_SHEET)
+#endif
     return;
 
   // Create a CoreImage filter and set it up