Using a frackin Dell Precision 690 workstation, dude. I tried switching to Firefox last summer. Worked ok, but it DID crash on me frequently, and I finally said the heck with it and went back to IE.
I’m on a Dell Optiplex GX520 and Firefox 3.0.4 works like a charm. I will NEVER go back to IE, no matter how frickin’ good they try to make it.