Arch Linux - Firefox H.264 Playback
Jul 16, 2015

When you first install Firefox on Arch it does not come with the packages necessary to playback H.264 video on YouTube (HTML5).

First off I recommend installing every possible gstreamer plugin. sudo pacman -Ss gstreamer0.10

Next install the optional Firefox packages. sudo pacman -S gst-libav gst-plugins-good

Restart Firefox and H.264 HTML5 playback should work.

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