Well, I cracked. I installed FireFox this morning and have spent the last hour or so customizing it to my liking.

There's really no reason for anyone not to use FireFox that I can see. With a very little bit of work you can make FireFox do whatever you want it to.

Welcome to 2004, I guess. I'm a little behind the curve on this, but I'm pleased with the switch so far.

UPDATE: So I installed the big ones: GmailNotifier, FoxyTunes, the Googlebar, AutoFill, BugMeNot, Zoomy, etc. Any FireFox users want to clue me into ones I might be missing?

UPDATE 2: In the comments, Anonymous offers a few more: "some other good extensions are sage (built in RSS), fireFTP (FTP client), smoothweel (smooths out scrolling), CookieCuller (extended cookie management) ... Tweak Network, FlashBlock (block flash, then click to load)."