I'm guessing that the "MSE & H.264" box in the pic attached to comment #2 might become green with a tick once the fix/es for https://bugzilla.mozilla.org/show_bug.cgi?id=778617 and/or https://bugzilla.mozilla.org/show_bug.cgi?id=881512 land.
** Bug watch added: Mozilla Bugzilla #778617 https://bugzilla.mozilla.org/show_bug.cgi?id=778617 ** Bug watch added: Mozilla Bugzilla #881512 https://bugzilla.mozilla.org/show_bug.cgi?id=881512 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1260788 Title: Firefox H.264 support Status in “firefox” package in Ubuntu: New Bug description: This is a tracking bug only. Please do not post comments. Firefox 26 has turned on the media.gstreamer.enabled preference by default. This enables H.264 playback with gstreamer 0.10 if the relevant gstreamer plugins are installed. Firefox support for gstreamer 1.0 is being worked on and is expected to arrive soon. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1260788/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp