Firefox 157 will include JPEG XL by default on all platforms

As of Firefox 157 I intend to turn JPEG XL decoding on by default on all platforms. It has been developed behind image.jxl.enabled, which today is on by default on Nightly only, and has had a Firefox Labs checkbox on every channel since 152. The decoder is jxl-rs, in Rust.

Bug to turn on by default: https://bugzilla.mozilla.org/show_bug.cgi?id=2065096

Standard: ISO/IEC 18181, https://www.iso.org/standard/85066.html

Standards body: ISO/IEC

Platform coverage: all

Preference: image.jxl.enabled

Standards position: https://github.com/mozilla/standards-positions/issues/522 (neutral)

TAG review: https://github.com/w3ctag/design-reviews/issues/633 (satisfied with concerns)

Intent to prototype: https://groups.google.com/a/mozilla.org/d/msgid/dev-platform/53b4e3e0-5eee-4768-a1ba-b069e1e85244n%40mozilla.org

Other browsers: Safari shipped in 17.0 in 2023. Chrome has it behind #enable-jxl-image-format using the same Rust library, no intent to ship yet.

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