Complete JPEG-XL Support

[gianni-rosato]

What feature would you like to see?

Currently, there is a flag disabled by default to support the JPEG-XL image format which works similarly to Firefox Nightly. This is great! However, there's a bit more to the story when it comes to complete JXL support:

• Firefox Nightly stopped maintaining their JPEG-XL support when the Chrome team made the controversial decision not to support JPEG-XL
• Since then, a the patchset has evolved to provide full JPEG-XL support without bugs. Bugs in the current implementation include:
  • Broken animation
  • Broken transparency
  • Improper color profile handling
• Browsers such as Waterfox, Floorp, and r3dfox have implemented the patches fully. In order to test this, you can use this JPEG-XL test page.

Other details

Here's a proper implementation (via Waterfox):

And here's Zen's current implementation (presumably carried over from Firefox Nightly):

I think it is super awesome that the JPEG-XL flag is enabled in the first place, but this is an opportunity to go the extra mile for JXL support as it continues to improve elsewhere. The entire Apple ecosystem supports JPEG-XL, and Cloudinary cites serving billions of JPEG-XL images regularly. In addition, there are rumors that the iPhone 16 may shoot JPEG-XL images by default.

If you're interested in making this work, I can point you in the direction of the patchset & connect you with some developers who may be interested in helping make this work. Zen is really cool by the way, and given this issue is addressed, I'll happily switch from Waterfox to Zen without question! Thanks for your great work!

[mauro-balades]

This is fixed for the next release

[junedabat]

As of 1.0.0-a.35, JPEG-XL support still isn't enabled by default for me.

Setting the image.jxl.enabled flag in about:config to true manually does enable it, but animated JPEG-XLs don't work.

Essentially, the problem is the same.