Firefox has been lousy ever since version 1.5, and I've been using it since about release 0.2.
I upgraded to version 2.0 last week and it's been crashing like Netscape 6.0 used to crash. Complete piece of crap. It makes Microsoft look very good and reliable.
It has worked great for me on three computers.
Im pretty much a 80/20 FF to IE user and though I like to believe I really don't have a dog in this fight, I dont think IE7 is as bad as everyone (FF user mostly) says it is. Its also not as good as MS makes it to be but it IS a marked improvement from prior IE's.
Take that for what it's worth.
Most comments against IE and for FF I take like a campaign commercial. IGNORED.
I would suggest the real problem is in your hardware or setup skills.
Name some specifics instead or vague grumbling.
I have never had it or any earlier versions crash.