Flash crashes in Firefox 14 on sites like Vimeo, when moving mouse or using keyboard

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http://askubuntu.com – After having searched for a solution for my problem on many forums, I'm still unable to help my Shockwave Flash 11.2 r202 in Firefox 14.0.1 crashing all the time when I try to watch a video, e.g. on vimeo, but only on mouse movement or keystroke on the keyboard. After reloading the site, the video loads ok and I am able to start the playback, but moving the mouse, e.g. to the maximize button, instantly crashes Flash. My guess is, it having something to do with compiz or one of its plugins, but I've checked ubuntu's recommended compiz setup for hints and found no clue. Videos from youtube are w (HowTos)