yeah I just tested this, autoplay only works on the video tag if muted which see...

afavour · 2024-03-30T14:16:52.000000Z

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.

padenot · 2024-03-30T17:07:18.000000Z

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.

nfriedly · 2024-03-30T18:49:05.000000Z

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

afavour · 2024-03-31T00:15:05.000000Z

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.

nfriedly · 2024-03-31T01:05:58.000000Z

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.