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Ok, apparently all the standard apps I have can't handle #JPEG-XL. That is Preview, Safari, Chrome (didn't try, but it's been removed) and Firefox.

Firefox I expected to work, but even after enabling the option in about:config, it still wouldn't open it.

Guess even though I have the option image.jxl.enabled, it's not actually included in the ESR release.

And yes, I did restart #Firefox.

https://jpegxl.io/tutorials/firefox/#firefoxjpegxltutorial