No playback h.264 on youtube

When I try to play html5 YouTube for most of the firefox browser. I find that the h.264 playback is not allowed. Therefore I don't think I can play at 2 x. I think firefox natively adopted h.264 already. I am not mistaken?

You have the codecs installed to play H.264 (MP4) videos?

On Windows XP, you must make the media.directshow.enabled set to true on the topic: config page.

Tags: Firefox

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