I'm giving #LibreWolf a spin. There's a number of things I'm not particularly satisfied with, including the inability to straightforwardly import/copy over a profile from #Firefox, and the choice to default-enable some pretty aggressive privacy feature that break actually useful functionality (such as browser fingerprinting protection that disables dark mode support). OTOH, I was looking forward at its #JPEGXL support.
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This is something that #Firefox actually ships in its #nightly builds, and #LibreWolf enables in its standard builds, which is nice … except for the fact that the #JPEGXL support in Firefox is actually … pretty poor 8-(
The basics are there, but transparency and animations aren't properly supported (go to https://jpegxl.info/test-page/ after setting image.jxl.enabled to true in about:config). I reported the bug upstream. Not sure I can hope to see it fixed anytime soon though.
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Oblomov