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Why can't I load youtube videos with FireFox 4.o beta

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Somehow or I don't know I can't load youtube videos, I can access the youtube page and pick a video normaly but when it's time for the video to load it won't ! the video screen will just stay in color balck ! I tried erasing the cookies and rebooting my laptop but nothing works ! I have windows 7 Ultimate with Firefox 4.0 beta everything is upgraded properly HELP !

Somehow or I don't know I can't load youtube videos, I can access the youtube page and pick a video normaly but when it's time for the video to load it won't ! the video screen will just stay in color balck ! I tried erasing the cookies and rebooting my laptop but nothing works ! I have windows 7 Ultimate with Firefox 4.0 beta everything is upgraded properly HELP !

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Clear the cache and the cookies from sites that cause problems.

  • "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
  • "Remove the Cookies" from sites causing problems: Tools > Options > Privacy > Cookies: "Show Cookies"

You can try to disable the hardware acceleration in the Flash Player.
See Flash videos won't play full screen

Flash "Display settings" window:

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Man this won't work ! anything ! Ive done everything and it won't work D: