I understand FF 4 beta 6 is crashing like mad on me :( I've had to use chrome for most of my browsing because 3 is too slow now that I've tried 4 but every tim

I understand FF 4 beta 6 is crashing like mad on me :( I've had to use chrome for most of my browsing because 3 is too slow now that I've tried 4 but every time my laptop goes to sleep and also randomly throughout the day it crashes. I'm a pretty heavy user though I keep 30 - 40+ tabs open on the regular