Try updating to latest flash 11.4, it is released today.

http://download.macromedia.com/get/flashplayer/current/licensing/win/install_flash_player_11_plugin.exe

or http://get.adobe.com/flashplayer/

thank you

Recent crashes of certain multimedia contents (this includes Youtube videos, certain flash games and other applications) in conjunction with Firefox are most probably caused by a recent Flash 11.3 update and/or a malfunctioning Real Player browser plugin.

In order to remedy the problem, please perform the steps mentioned in these Knowledge Base articles:

Flash Plugin - Keep it up to date and troubleshoot problems

Adobe Flash plugin has crashed - Prevent it from happening again

Flash 11.3 doesn't load video in Firefox

Updating Flash to 11.4 may also work.

Other, more technical information about these issues can be found under these Links:

http://forums.adobe.com/thread/1018071?tstart=0

http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html

Please tell us if this helped!

I updated all of these things and it did not work...

Try to Turn off hardware acceleration and disable the hardware acceleration also in the Flash Player, see: http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues

http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html

thanks again

this seems to have been an on going problem for i have had this problem for a while why doesn't firefox fix it, less of a problem in ie ?