Previously it could only be enabled in nightly, but today in Librewolf 119.0-5 (based on firefox 119 stable) I found that you could also go to about:config and set image.jxl.enabled to true and enable support for jpeg-xl. Is it only a librewolf thing? I am asking here cause I don’t have time to personally test.
I just checked and while I do have the option and set it to
true, I couldn’t load the JXL images on this page.I can see the first 3 images :
Royal Palace
Dice
Though I don’t think this is the desired effect.
Wide-gamut image
Animated Jpeg-Xl
This is broken for me too on Linux.