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Firefox can't play youtube

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I can't access videos on youtube any more. The page opens as it should and I can see all the video information and all comments and video suggestions, but the player itself is only a black screen. There are no controls and no picture.

I can still watch the videos embedded on other sites or in email, but not directly on youtube.

It's definitely a Firefox-related issue, because I double-checked with IE and everything worked fine with those browsers.

I tried the solutions in this page https://support.mozilla.com/hy-AM/questions/763673

I used CCleaner, but still no help.. It was working fine few days ago.. I have no idea what happened.

Please HELP!

I can't access videos on youtube any more. The page opens as it should and I can see all the video information and all comments and video suggestions, but the player itself is only a black screen. There are no controls and no picture. I can still watch the videos embedded on other sites or in email, but not directly on youtube. It's definitely a Firefox-related issue, because I double-checked with IE and everything worked fine with those browsers. I tried the solutions in this page https://support.mozilla.com/hy-AM/questions/763673 I used CCleaner, but still no help.. It was working fine few days ago.. I have no idea what happened. Please HELP!