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Issues when attempting to go Full-Screen

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Whenever I attempt to watch videos in full screen on sites like Youtube, Firefox fails to open the video in full screen and just makes the area where the video should be go black. Sometimes it even crashes.

http://img29.imageshack.us/img29/2048/63130424.png

That shows my problem.

Whenever I attempt to watch videos in full screen on sites like Youtube, Firefox fails to open the video in full screen and just makes the area where the video should be go black. Sometimes it even crashes. http://img29.imageshack.us/img29/2048/63130424.png That shows my problem.

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Its also worth mentioning that I've updated Flashplayer and Firefox to the latest versions since then and still get the problem.