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My pc firefox browser is not opening any video or mp4

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When ever I open a video or mp4 my firefox browser do not open's or load that file ........... I'm really fed up of using different browser for different things so please !! can any one help me ?

When ever I open a video or mp4 my firefox browser do not open's or load that file ........... I'm really fed up of using different browser for different things so please !! can any one help me ?

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See if this helps your problem : Video or audio does not play


thank you

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