Video not working for certain sites
I recently got a new computer, and in trying to get all my old accounts and what not synced up, I noticed that Twitter videos weren't playing for me and giving me a generic "The video could not be played", which was odd and annoying, but not the end of the world. I then went over to Twitch and got the "Your browser encountered an error while decoding the video. (Error #3000)". Meanwhile, Youtube works perfectly fine.
I tried clearing cache/cookies, tried on incognito mode in case it was an issue with one of my extensions, all to no avail - when I swapped over to Edge just to check if it was a computer issue versus a Firefox issue, both sites functioned in Edge just fine. Is there anything else I can try troubleshooting in Firefox to see what's causing this short of trying to uninstall/reinstall again?
Chosen solution
If your version of Windows does not bundle media components -- this is more of an issue in Europe than in North America -- you probably need to install a media feature pack. This article has more info:
Fix video and audio problems on Firefox for Windows N editions.
If that isn't the issue, I have a copy of YouTube's old feature support test page on my website. Normally these will all say either supported or probably. Does your Firefox list any unsupported items:
https://www.jeffersonscher.com/sumo/html5-video.html
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Chosen Solution
If your version of Windows does not bundle media components -- this is more of an issue in Europe than in North America -- you probably need to install a media feature pack. This article has more info:
Fix video and audio problems on Firefox for Windows N editions.
If that isn't the issue, I have a copy of YouTube's old feature support test page on my website. Normally these will all say either supported or probably. Does your Firefox list any unsupported items:
Ahh, that was it - thank you!