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 wel

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.