If you need an earlier version of FireFox to test out, I happen to have a fresh copy of 2.0.0.6, which was the last 'great' version, in my opinion.
I now use 2.0.0.11, but only because I forgot to set auto-update to 'ask me first' and it update itself : (
Otherwise, if you're truely done with FireFox, Opera is excellent.. I use it occasionally to test web pages after posting them, to be sure that all code has been properly placed..
Safari-PC is also decent, but very plain and cold.. no real personality to it, unless you enjoy modding sub-files that aren't meant to be tampered with :]