Weird, I always disliked Safari's compass and really did like Firefox' logo.
might as well rename FireFox to RedPanda too ;)
The Firefox name is kind of catchy (and known) so I wouldn't go that far. ;)
I think the name started it started out as Phoenix, then Firebird - which they couldn't use as it was a database, and then was named Firefox. I quite like the transition. Not sure if it was Clint Eastwood inspired or not. I like the way that Firefox is the Red Panda - so it's nice that it kind of has that evolution. It so happens that the Firefox is rare and is totally cute. There was an icon floating around on Linux which was based on the panda that I liked - and the panda has loads of potential for a lovely icon.
I like the idea of the ship's wheel in the navigator logo, and the compass in Safari. As for the other logos they don't do anything for me (oh alright, IceWeasel is quite a funny knock off, and Nightly's is boringly okay.)