I have the same problem with Firefox! It really pisses me off because people say it's ME or my computer, yet it happens on my work machines and with my friends.
The only fix I've found so far is to downgrade Firefox to version 1.5. I don't know what version of Mozilla corrisponds with this, but you could just try some older ones. Oh, and disable auto update...
__________________
Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
|