I installed Firefox 4 on Mac OS X. When I go to Mozilla Addons, I can't install any themes. All the themes say "not available for your platform". There isn't even any way to filter themes by platform. Now, the real reason I want to change my theme is the completely idiotic decision of not displaying favicons in default theme on Mac. I searched for that problem and found a post in Mozilla forums saying we need to use a different theme if we want to see favicons. But I just can't get ANY themes for FF on Mac. EDIT: forgot to mention that without favicons, App Tabs are completely useless.