Firefox Doesn't Support AC3 Audio
When I play a video with the web player in Firefox that has AC3 audio, I get no sound.
Doing some research it looks like AC3 used to be patented so I assume that is why it isn't included in Firefox but since March 20, 2017 the patent for AC3 has expired so I'd think it's now OK to include in Firefox.
The same video works in Edge and Chrome.
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Not really sure how I can have you replicate what I see as it's not a link I can give out.
If you can find an HTML 5 video that has AC3 audio you will see it does not work.
When you look on Mozilla's website it doesn't mention AC3 support (https://support.mozilla.org/en-US/kb/audio-and-video-firefox)
If you go to this website you'll see that Dolby Digital support (AC3) is not detected (https://html5test.com/)
You can go to that same website with Edge and see that Dolby Digital is supported and it does work for me when I play a video that has AC3 embedded in it. Admittedly, Chrome apparently does not work with it. That was just an assumption I made when Edge worked.
Seems like something that Firefox could do better than Chrome then.