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note for the next person, i had to search:

Firefox AVIF experimental support is disabled by default but can be activated via "image.avif.enabled" flag.

And this is the exact reason that it hasn’t been stabilised yet. It was going to be released in 86 (February), and was even enabled in the 86 beta, but people pointed out that this should be considered a blocker as it would scupper the format for years by undermining all confidence in it, so it was disabled again.

Thanks for pointing that out. I posted my top level comment in order to alert anyone using AVIF in Firefox about why the images are likely to look wrong, as well as warn off anyone thinking of including AVIF in an HTML5 <picture> element until the situation has improved.

It's worth pointing out that (as far as I know) the fact that canvas elements and videos aren't color managed in Firefox hasn't been considered a blocker for shipping either of them. There hasn't been any movement on the bug I linked in many months (other than users confusing the issue in comments), and so I hope the problem isn't eventually swept under the rug.

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