SSJ, I do not understand what the heck you are talking about. I've used Firefox on Redhat Linux, Debian, Mandrake, Window 2000, Windows XP, and Mac OS X Panther. All roxx0r. Why does it screw up your computer?
Crow is right. It runs awesome, and it doesn't even depend on the computer. So edso, welcome to Mozilla world and don't worry. You won't have problems with it at all.