1. Go to `about:config` and convince it that you know what you're doing.
2. Search for `media.autoplay.default`.
3. Double-click `0` and enter `1` if you want to always block, or `2` if you want to be prompted for every site that tries to autoplay (which can help with some sites that don't work quite right with blocked autoplay.)
4. Enjoy your significantly-more-pleasant browsing experience!
@zigg Thanks. I'd set 'media.autoplay.enabled' to false but was still getting a lot of autoplay. Fingers crossed this one does the trick!
I have a specific Firefox instance for YouTube
I long since gave up on vimeo working under any circumstances
Other sites I take on a case by case basis
I do need to come up with a plan for PeerTube and other Federated video sharing instances
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