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It’s specifically to replace GIFs. If you don’t allow autoplay of muted videos people will just use GIFs which are way, way more bandwidth intensive.

It keeping your computer awake sounds like a bug though, it’s not intended behavior.

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Please open a bug at https://bugzilla.mozilla.org/enter_bug.cgi?product=Core&comp... if that's the case, and CC padenot@mozilla.com, I'll have a look next week.

Here's the bug I filed several years ago: https://bugzilla.mozilla.org/show_bug.cgi?id=1684718 - I just cc'd you

I interpreted the comments on that bug to mean that the Adafruit site has an unmuted video that happens to have a silent audio track, which isn’t strictly a muted autoplay issue. But maybe I’m wrong.

Yeah, I think there was some confusion about which video on the page was causing the issue, but the test cases I created are much simpler - just one video per page.

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