Firefox is not playing most of my videos
I have been running Mozilla that comes default with Ubuntu 18.04 for the last one and a half months but not been able to play most videos and gifs. Youtube runs properly but Amazon Prime does not. I tried restarting in the safe mode and still couldn't get it to work. I only added an ad-blocker add on and disabling this did not help too.
I browse reddit and one thing I noticed is that gfycat gifs play fine but rest of them just don't play. They just show a picture of the first frame, no error messages as such.
Solution choisie
With the various flavors of Ubuntu you may also find the FFmpeg in Ubuntu Restricted Extras for example. https://help.ubuntu.com/community/RestrictedFormats
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Please try the full installer from; Download Firefox For All languages And Systems {web link}
I installed from the link given but still the issue is not solved. Thanks for the reply!
https://support.mozilla.org/en-US/kb/fix-problems-images-not-show
https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows
https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues
https://support.mozilla.org/en-US/kb/html5-audio-and-video-firefox
https://support.mozilla.org/en-US/kb/troubleshoot-issues-with-plugins-fix-problems
https://support.mozilla.org/en-US/kb/warning-unresponsive-plugin
Make sure you have installed the latest FFmpeg packages in Ubuntu. See also about:config: media.ffmpeg.enabled = true
You can open the YouTube test page to check support in Firefox for playing HTML5 media.
Solution choisie
With the various flavors of Ubuntu you may also find the FFmpeg in Ubuntu Restricted Extras for example. https://help.ubuntu.com/community/RestrictedFormats
Installing restricted extras package solved the issue. Many Thanks for replying!