Since I installed the latest Firefox version on my openSuSE 11 box, it started to crash constantly on some websites, e.g. Jon Stewarts Full Episode player or the German news channel of Tagesschau. A lot of Google research did not reveal anything useful. Some users reported advance when de-installing AdBlock. That didn’t work, though.
At some forum I read that there are conflicts with pulseaudio installation together with flashplayer. So I deinstalled all pulseaudio packages. I had to restart my Gnome Desktop Manager (gdm). But finally it worked out. All flash videos now play perfectly, Jon Stewart as well as Tagesschau.
So you might want to give that a trial.