first, the two sessions i had up froze solid, which required "killall firefox". a new session i started lasted less than 10 seconds before it vanished.
time for a different browser, methinks, until this is sorted out.
I have been using Firefox 3.1b2 and later 3.1b3 on multiple F10 x86_64 machines for the last few months. It is remarkably stable, though not perfect. I have seen the random crash here or there. The most reproducible one is going to ted.com. Watch a video, go back or forward. Sometimes it will crash. I suspect it is more flash than Firefox. The version of flash is 10.0.22.87, and it is 64bit.
It seems it is a known flash issue. It even causes issues with Opera.
well, that *is* the 64-bit flashplayer that i have installed, so maybe we've tracked down the cause.
I've found in the past that flash has been notorious for lack of stability on firefox so I never use it now. I use swfdec which covers most stuff but can be somewhat of a cpu hog. That said beta 3 hasn't been quite as stable as beta 2 for me but it is still usable.
Peter