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Home/ Questions/Q 6942375
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Editorial Team
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Editorial Team
Asked: May 27, 20262026-05-27T13:00:30+00:00 2026-05-27T13:00:30+00:00

Does Firefox 8 (win/64) Support mp4? I cannot find any mention on MDN of

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Does Firefox 8 (win/64) Support mp4?

I cannot find any mention on MDN of support for mp4 AND it’s not playing mp4 files locally on server.

Please advise.

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  1. Editorial Team
    Editorial Team
    2026-05-27T13:00:30+00:00Added an answer on May 27, 2026 at 1:00 pm

    Firefox does not support the mp3/mp4 technologies, as aspects of them are licensed.

    See the ‘official’ support list for Firefox here: https://developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements

    More about why Firefox avoids it:
    http://en.wikipedia.org/wiki/MP3#Licensing_and_patent_issues

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