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Video or audio does not play - MozillaZine Knowledge Base
http://kb.mozillazine.org/Mozilla_Suite_:_Issues_:_Sound#:~:text=Sometimes%20the%20audio%20or%20video%20content%20embedded%20in,web%20page%20is%20coded%20specifically%20for%20Internet%20Explorer.
Firefox Does not play embedded audio (mp3) on certain ...
https://support.mozilla.org/en-US/questions/1108672
Start Firefox in Safe Mode to check if one of the extensions (3-bar Menu button/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem. Switch to the DEFAULT theme: 3-bar Menu button/Tools > Add-ons > Appearance Do NOT click the Reset button on the Safe Mode start window https://support.mozilla.org/kb/Safe+Mode
Firefox not playing embedded audio : firefox
https://www.reddit.com/r/firefox/comments/5zzc7k/firefox_not_playing_embedded_audio/
There's embedded music that should be playing, and it used to, but I don't know when exactly but it stopped working. I have the latest stable Firefox 52.0 64-bit with e10s enabled [Win 7 64-bit] I checked on my laptop with the same Firefox setting with and without e10s and it works there.
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