I also think it's a Google ad that's not loading. If you look at where the ad would be, there's nothing there.
It doesn't happen all the time, but enough to be darn annoying.
Crouse, is there a way to turn off "alerts"?
Yes, this is Suse 9.3 and FF with all updates.
Mucks, that's a "theme". In FF, click on Tools, and Themes, Get More Themes. It will take you to a sight where you can view and choose themes. Then just click "install" and in seconds you are done.
To change themes, open Tools - Themes and click on your choice, then Use Theme. Close FF, reopen and wa la, new theme.