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I have installed media feature pack but still h264 etc. don't work in firefox. Why can't I play some video in Firefox?

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Can't use Twitch, twitter videos and some videos on youtube right after a livestream. I get that "to enhanced video quality install microsoft media pack" or something like that, but I already have. I get that youtube error list showing red on h.264 and some other format also.

Can't use Twitch, twitter videos and some videos on youtube right after a livestream. I get that "to enhanced video quality install microsoft media pack" or something like that, but I already have. I get that youtube error list showing red on h.264 and some other format also.

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Uninstall and download Full Version 56.0.1 Installer from here : https://www.mozilla.org/en-US/firefox/all/

Check your Flash to see if running Flash Player Version: 27.0.0.170

Please let us know if this solved your issue or if need further assistance.