Find all needed information about Mp4 Support Firefox. Below you can see links where you can find everything you want to know about Mp4 Support Firefox.
https://support.mozilla.org/en-US/questions/1047078
Related. How can I play mp4 videos in external player? How do I change what happens when I click on a link when no options are presented? Unable to play powerpoint recorded videos with acceptable audio in firefox - very crackly.
https://developer.mozilla.org/en-US/docs/Web/Media/Formats
The modern web has powerful features to support the presentation and manipulation of media, with several media-related APIs supporting various types of content. Generally, the media formats supported by a browser are entirely up to the browser's creators, which can complicate the work of a web developer.
https://stackoverflow.com/questions/40760864/how-to-play-mp4-video-in-firefox
Original answer - for older versions of Firefox. As noted in the comments Ubuntu/firefox does not support mp4 natively - this is due to licensing issues. The Mozilla documentation is a little confusing (IMHO) so the table at the bottom is probably the best place to look. However you can add support fairly easily by installing Ubuntu extras:
https://www.mozilla.org/en-US/firefox/new/
Download Mozilla Firefox, a free Web browser. Firefox is created by a global non-profit dedicated to putting individuals in control online. Get Firefox for Windows, macOS, Linux, Android and iOS today!
https://itube.aimersoft.com/download-mp4/firefox-mp4-downloader.html
Jan 09, 2019 · Firefox MP4 Downloader is not working in other browsers other than Firefox. This can be resolved by looking for an alternative add-on since the Firefox MP4 Downloader is an add-on specifically built in for Firefox and this means it is not available or compatible with any other browser of your choice such as Google Chrome, Safari e.t.c.
https://www.wonderplugin.com/wordpress-video-gallery/one-mp4-format-to-play-in-all-web-browsers-and-devices/
May 25, 2019 · Can I only use one mp4 video format to play in all web browsers? Answer: Yes, with our WordPress gallery plugin Wonder Gallery, you only need to provide one mp4 format to play in all web browsers and devices. In iPhone, iPad, Android, Chrome, Safari, Firefox, Opera, IE 10 and above, the gallery plugin will use HTML5 to play the mp4 video.
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