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H.264 how to play without flash from sites demanding flash player like youtube

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http://www.theregister.co.uk/2012/12/20/firefox_20_h264_windows/ suggests that there is more than shumway in nightly but I still get error at youtube.com...

http://www.theregister.co.uk/2012/12/20/firefox_20_h264_windows/ suggests that there is more than shumway in nightly but I still get error at youtube.com...

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HTML5 website no need of flash player. http://www.youtube.com/html5

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I set this pref to true media.windows-media-foundation.enabled; as with Shumway many videos play fine including many at youtube. However some apparently have a ua sniffer and refuse to offer other than flash format.