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Firefox 77 includes AV1 image format[0] support! You'll need to set image.avif.enabled = true in about:config.

[0] https://aomediacodec.github.io/av1-avif/

Haven't been following this, is there any major site where this makes an impact? Youtube?

I doubt that any big site would be affected, since Firefox is the first browser shipping any form of AVIF support, even though most browsers already have AV1.

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