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Firefox won't load youtube videos on any site but youtube

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Youtube videos won't load on sites other than youtube. Youtube is just fine, but videos from youtube don't even show up on other sites. Just a white space, which you can tell are supposed to be videos because if you right click you see Flash options. The videos all work just fine in IE....

Youtube videos won't load on sites other than youtube. Youtube is just fine, but videos from youtube don't even show up on other sites. Just a white space, which you can tell are supposed to be videos because if you right click you see Flash options. The videos all work just fine in IE....

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Just a guess: Have you installed any extensions that block ads? If so, the settings might need to be tweaked.