Feel like you need a more traditional looking Firefox interface, but still don’t want the ugly mess that some Firefox themes out there deliver? For tradition, style and class I direct your attention to the CrystalFox Classic theme.
I am not sure if I really like the idea of my browser being cute. Then again, not sure if I would want it to be overly macho either. Nobody likes a browser with a five-o-clock shadow and a bad attitude. Most people would say Internet Explorer fits that description, not Firefox.
With that now being common knowledge now I have to say I like the CrystalFox Cute theme for Firefox. It is pretty darn cute.