I don't think it's a simple problem though. I want my videos on Youtube, Twitch and other similar sites to auto play, without having to click it manually every single time. We get into a whitelist/blacklist situation. The best way is to stick to one way, and allow users to fully unblock a site. Right now, it auto plays but you can fully blacklist a whole domain. I could also see it as everything is blocked and you whitelist Youtube. Maybe even automatically does it if you click play on a few videos.