Only on Windows 7 and 8. Linux Gstreamer support just landed in nightly, preffed off. https://mobile.twitter.com/FirefoxNightly/status/34910062265...

OS X is a bit more complicated due to needing to poke at Quicktime for the codecs.

Didn't know that about nix, nice. I forgot to mention that about it being only supported on windows for now.

Still waiting on Opera to make a move for mp4...especially with the promises that H.265 make in regards to reduced file sizes with great qualities.

Although I know mp4 is patent encumbered, it's too prevalent to ignore (thanks to Apple and Microsoft products).