Download Firefox 21 Alpha

By | February 11, 2013

Download Firefox 21 AlphaWith experimental H.264/AAC/MP3 support.

Now here is a nice update for you. It looks like just recently, Mozilla was debating whether or not to continue supporting the H.264 codec. Now, the open source organization has pushed a new batch of Firefox nightly builds that will make at least some of its users happy. Why? Well, it has enabled a support for playing H.264/AAC in MP4 and MP3 audio files in HTML5 video and audio tags by default on Windows machines.

On a side note, Mozilla has also said that we will only see H.264/AAC/MP3 support on Windows in Firefox 22, which is set for June 25 release, rather than Firefox 21.

Firefox 21 Alpha

About (Author Profile)

Vygantas is a former web designer whose projects are used by companies such as AMD, NVIDIA and departed Westood Studios. Being passionate about software, Vygantas began his journalism career back in 2007 when he founded Having said that, he is also an adrenaline junkie who enjoys good books, fitness activities and Forex trading.

Comments (5)

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  1. Žilvinas Urbonas says:

    Will give it a try when it will be available on Mac ;/

  2. apád anyád says:

    I think you meant “whether or not to start supporting the H.264 codec”.

  3. Przemysław Lib says:

    Its actually support for CODECS INSTALLED ON WINDOWS. So if for some reason you do not have those codecs installed FF will not have H.264 support.

    And Moz is checking if they can do the same for GStreamer for Linux.

    • Mehran says:

      install mplayer-codecs-20061022-1.i386.rpm


      you’ll be probably good to go!

      • Przemysław Lib says:

        Will it install firefox plugin for mplayer as well? Or is it just adding codecs firefox will use?