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Firefox 14 has a build option --enable-gstreamer that allows it to playback html5 videos using codecs from gstreamer. This allows users to add codecs that are not shipped by default (notably H.264).

This is not enabled in current fedora builds (as can be seen by putting about:buildconfig in the URL bar), hence only theora and webm videos can be played.

This would increase the number of sites on which the html5 video can be used instead of flash.

I assume that this would be equivalent licence-wise to rhythmbox and gstreamer, that can have additional codecs added by the user through gstreamer plugins. 

Reproducible: Always

Steps to Reproduce:
1. open the page http://www.quirksmode.org/html5/tests/video.html
2. only the theora and webm videos play


Expected Results:  
With --enable-gstreamer and the correct gstreamer plugins added the H.264 video should also play