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Cannot see video on some websites

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I cannot view embedded YouTube videos on some websites. The video screen does not even appear.

I cannot view embedded YouTube videos on some websites. The video screen does not even appear.

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Are you using high speed internet or not ?? N if yes !!! Thn clear catch files and cookies form firefox

https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

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And after cleaning you face same problem !! Than its flash player problem !! So up date it n enjoye..... :)