FF153 Image/jxl supported in nightly#44595
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hamishwillee
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Jun 29, 2026
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Preview URLs (2 pages) Flaws (1) Note! 1 document with no flaws that don't need to be listed. 🎉 Found an unexpected or unresolvable flaw? Please report it here. URL:
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hamishwillee
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Jun 29, 2026
| To experiment with them, search for the appropriate preference on the `about:config` page and set it to `true`. | ||
| You can find more such features on the [Experimental features](/en-US/docs/Mozilla/Firefox/Experimental_features) page. | ||
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| - \*\*JPEG XL image support: (Nightly): `image.jxl.enabled` |
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Note, this appeared in 149 too, when the Rust decoder was added. Given that was some releases ago and this has gone into Nightly, I figure with adding again.
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This pull request has merge conflicts that must be resolved before it can be merged. |
dipikabh
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Jul 9, 2026
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Thanks, Hamish!
Leaving it for you to merge after you've resolved the conflicts
| #### JPEG XL support | ||
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| Firefox supports the [JPEG XL](https://jpeg.org/jpegxl/) image format, a modern successor to JPEG that offers improved compression and image quality, along with new capabilities such as transparency, animation, and HDR support. | ||
| See [Firefox bug 1539075](https://bugzil.la/1539075) and [Firefox bug 2016688](https://bugzil.la/2016688) for more details. |
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Should we also add Firefox bug 2040074 to the list?
| To experiment with them, search for the appropriate preference on the `about:config` page and set it to `true`. | ||
| You can find more such features on the [Experimental features](/en-US/docs/Mozilla/Firefox/Experimental_features) page. | ||
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| - \*\*JPEG XL image support: (Nightly): `image.jxl.enabled` |
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| - \*\*JPEG XL image support: (Nightly): `image.jxl.enabled` | |
| - **JPEG XL image support** (Nightly): `image.jxl.enabled` |
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| - \*\*JPEG XL image support: (Nightly): `image.jxl.enabled` | ||
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| The rust-based [JPEG XL](https://jpeg.org/jpegxl/) image decoder is now enabled on nightly. ([Firefox bug 2040074](https://bugzil.la/2040074)). |
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| The rust-based [JPEG XL](https://jpeg.org/jpegxl/) image decoder is now enabled on nightly. ([Firefox bug 2040074](https://bugzil.la/2040074)). | |
| The Rust-based [JPEG XL](https://jpeg.org/jpegxl/) image decoder is now enabled by default in Nightly. ([Firefox bug 2040074](https://bugzil.la/2040074)). |
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FF153 supports the image/jxl format in nightly in https://bugzilla.mozilla.org/show_bug.cgi?id=2040074
This updates the experimental features to indicate the first version in which it appeared in nightly, and also the release note to mention the upgrade to preview.
Related docs work can be tracked in #44474