I prefer to use Firefox but I constantly get errors Error Code: 200001 trying to play video in all Firefox and updates. This NEVER happens in BRAVE?

Also, thank you for sharing your Add-ons list. If you temporarily disable both of these two extensions, does that make any difference:

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

Hmm, not sure. You may have noticed the shield icon at the left end of the address bar is a bit purplish. That indicates the Tracking Protection feature is blocking something in the page. Could you click the shield and turn off protection on the page temporarily -- just click the slider switch at the top of the drop-down panel -- and see whether that makes any difference?

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Hmm, not sure. You may have noticed the shield icon at the left end of the address bar is a bit purplish. That indicates the Tracking Protection feature is blocking something in the page. Could you click the shield and turn off protection on the page temporarily -- just click the slider switch at the top of the drop-down panel -- and see whether that makes any difference?

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Also, thank you for sharing your Add-ons list. If you temporarily disable both of these two extensions, does that make any difference:

Thanks for the prompt replies. The shield fence was for facebook container. I had 3 blockers and the html5 blocker was the problem. By disabling it OFF and leaving the others ON the problem seems to have gone. The other blockers don't cause a problem. I now have to see which videos or webpages will not block autoplay.

Your troubleshooting information shows several extensions that can block autoplay, so it is quite possible that one of them is causing this problem