Yes, I have allowed autoplay on the video sites, but it is now click-to-enable on all those others sites that are just using it for ads. Go to about:config in

Yes, I have allowed autoplay on the video sites, but it is now click-to-enable on all those others sites that are just using it for ads. Go to about:config in Firefox, and change "media.autoplay.allow-muted" to false. Chrome has shut down auto-play on any video with sound (excepting video specific sites) and they have a flag "Autoplay policy" which was partially successful, but not as effective as the blocking in Firefox.