diff --git a/mozilla/widget/src/cocoa/nsCocoaWindow.mm b/mozilla/widget/src/cocoa/nsCocoaWindow.mm
index cc6b130eb00..cd0f5540d7a 100644
--- a/mozilla/widget/src/cocoa/nsCocoaWindow.mm
+++ b/mozilla/widget/src/cocoa/nsCocoaWindow.mm
@@ -375,6 +375,8 @@ nsresult nsCocoaWindow::StandardCreate(nsIWidget *aParent,
       [mWindow setLevel:kCGDesktopWindowLevelKey];
     }
 
+    [mWindow setBackgroundColor:[NSColor whiteColor]];
+
     [mWindow setContentMinSize:NSMakeSize(60, 60)];
 
     [mWindow setReleasedWhenClosed:NO];