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No audio on some videos while others work fine

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Video is working fine,no audio on some videos while streaming on yesmovies,but others are working fine. Similar problem on some other streaming sites as well. Help please.

Video is working fine,no audio on some videos while streaming on yesmovies,but others are working fine. Similar problem on some other streaming sites as well. Help please.

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type "about:support" in the url bar then click "refresh firefox" and test again.

if not working, please give Firefox version, OS version (if windows, check if you have an "N" version) and examples of which videos cause this.

also goto www.youtube.com/html5 and report which features are disabled