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Firefox tab groups just got an upgrade, thanks to your feedback | The Mozilla Blog
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There is no setting for that and there are old open bugs about it. You can block "auto play" where the sound starts as soon as you open the page. But once there's any user input, it's no longer "auto" and the site can start playing sound. It can't be blocked. Bah.
I set media.autoplay.blocking_policy=2 and media.autoplay.default=5. That seems to prevent anything from auto playing for me.
Hmm I will look into those settings. But I'd like to control it site by site rather than thru a global config.
Ah I see. Haven’t encountered that anywhere, that sucks!
My fix for those sites is to never visit them again. Horrible.