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I remember somewhat recently that YouTube was using the H.264 codec for their videos in HTML5 format. This is a proprietary format, and Firefox is open source, so they only support Theora and Ogg Vorbis.

Does YouTube plan on supporting Firefox (or does the Firefox developers plan on using H.264?)

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up vote 2 down vote accepted

YouTube are also supporting the WebM format which will be supported under Firefox version 4.

Supported Browsers

We support browsers that support both the video tag in HTML5 and either the h.264 video codec or the WebM format (with VP8 codec). These include:

Firefox 4 (WebM, Beta available here)

Google Chrome (h.264 supported now, WebM enabled version available via Early Release Channel)

Opera 10.6+ (WebM, Available here)

Apple Safari (h.264, version 4+)

Microsoft Internet Explorer 9 (h.264, Beta available here)

Microsoft Internet Explorer 6, 7 or 8 with Google Chrome Frame installed (Get Google Chrome Frame)

Taken from http://www.youtube.com/html5

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