Gotta say it works fine here too. Since you're still using Firebird, I'd say take this opportunity to remove Firebird and its settings from your drive (don't forget to backup your bookmarks.html file), then download the new FireFox distribution. (It has its own handy installer now...)
Maybe something got screwed in the browser settings, perhaps even your cookies?
I've tested Firebird 0.7 and Firefox 0.8 trying to bring up forums, they work just fine here.
