iOS has ecosystem-wide full-ish support, but firefox only supports JXL behind a feature flag in their nightly builds. They have the same opinion as chromium but they arent that stupid to remove it entirely
some idiot Chromium engineer who worked on webp is blocking it from being put in. see jpegxl.info
on desktop install https://chrome.google.com/webstore/detail/jpeg-xl-viewer/bkhdlfmkaenamnlbpdfplekldlnghchp
on mobile choose a browser that has it already. Cromite is a good option https://github.com/uazo/cromite
iOS and Firefox users don't need to bother
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