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I am. It’s worse than Chrome in a way frankly in that JPEGXL is only supported in the Nightlies behind a flag.

However Mozilla has not completely dropped the feature like Google.

Mozilla's JPEG XL feature request is closed in a way that not possible to add comments or express interest.

Chromium's JPEG XL feature request is marked wontfix but still possible to comment or express interest (star the bug).