i don't.[^1] but like it or not, chrome dictates what the internet does now. there's no point in sites hosting jpegxl images if ~3% of their users will see it, and there's no point in firefox developing a decoder if no sites host jpegxl. so even though it's objectively better, and is highly supported by non-browser programmes; it has no recourse for gaining traction on the web
[^1]:
in fact, i loudly decry it to anyone who will listen. but the number of non-chromium browsers i can count on my fingers.