that is remarkable...I've had several crashes but not like all the time! one thing that I do get quite often...."unresponsive script error" - that is QUITE annoying
Like I said often when some software crashes there is some kind of hardware problem...maybe this is not the case with FF and maybe there are some bugs or something but check your RAM or something ....
I migrated from Opera before I switched to FF....I wouldn't say WAY better, though it is much better in some aspects (memory usage - for me at least).
I upgraded but then quickly downgraded back to 1.5.0.7, none of my plugins worked and I couldn't get anything done...I'm still on 1.5.0.x now, I like it and I'm happy with it.