I use FF 13, I keep getting this problem with youtube (see link)

http://screencast.com/t/oFkj6gBzBksd
IE doesnt have the problem, so i assume the problem is firefox's

This may be caused by a recent Flash 11.3 update.
See:
*https://support.mozilla.org/kb/keep-flash-up-to-date-and-troubleshoot-problems
*https://support.mozilla.org/kb/flash-crashes-or-does-not-load-firefox-13
Try to disable protected mode as a test.
*http://forums.adobe.com/thread/1018071?tstart=0
*http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html

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