this post was submitted on 05 Sep 2026
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Do you have some experimental flag enabled or something? Neither link is working for me on LibreWolf.
Regardless, it is good to know that when Firefox supports JPEG XL, it seems to support animated ones.
EDIT: I just enabled that, and both of the above links work as expected!
~~1. Navigate to
about:config~~~~2. Search
jxl~~~~3. Toggle
image.jxl.enabledtotrue~~Actually, see what @mschae@discuss.mschae23.de posted below. That is likely a safer method than messing with
about:configYes, there's an “enable JXL (JPEG XL) support” toggle in the settings (tabs and browsing → media on librewolf (which is what I use too), or in ‘firefox labs’ on normal firefox).
Animated JXL worked for me on Firefox mobile after enabling that flag in about:config