# Firefox Nightly

Firefox Nightly is an unstable testing and development platform for the next generation Firefox web browser.

This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles.

## Intent to Ship: JPEG XL

DevFeed: [Intent to Ship: JPEG XL](<https://devfeed.tech/articles/intent-to-ship-jpeg-xl-4154.md>)

Original publisher: [Read original article](<https://hacks.mozilla.org/2026/08/intent-to-ship-jpeg-xl/>)

Author: Jake Archibald

Published: 2026-08-24T15:32:15Z

Content type: article

Language: en

Sources: [Mozilla Hacks - the Web developer blog](<https://devfeed.tech/sources/mozilla-hacks-the-web-developer-blog.md>)

Topics: [Firefox](<https://devfeed.tech/topics/firefox.md>), [Web](<https://devfeed.tech/topics/web.md>), [Rust](<https://devfeed.tech/topics/rust.md>), [Firefox Nightly](<https://devfeed.tech/topics/firefox-nightly.md>), [Google](<https://devfeed.tech/topics/google.md>), [Chrome](<https://devfeed.tech/topics/chrome.md>), [C++](<https://devfeed.tech/topics/c-plus-plus.md>)

Tags: [blog](<https://devfeed.tech/tags/blog.md>), [browser](<https://devfeed.tech/tags/browser.md>), [browsers](<https://devfeed.tech/tags/browsers.md>), [c-plus-plus](<https://devfeed.tech/tags/c-plus-plus.md>), [developer](<https://devfeed.tech/tags/developer.md>), [features](<https://devfeed.tech/tags/features.md>), [firefox](<https://devfeed.tech/tags/firefox.md>), [firefox-nightly](<https://devfeed.tech/tags/firefox-nightly.md>), [google](<https://devfeed.tech/tags/google.md>), [hacks](<https://devfeed.tech/tags/hacks.md>), [interop](<https://devfeed.tech/tags/interop.md>), [mozilla](<https://devfeed.tech/tags/mozilla.md>), [uncategorized](<https://devfeed.tech/tags/uncategorized.md>), [web](<https://devfeed.tech/tags/web.md>)

### AI overview

Mozilla announces its intent to ship JPEG XL in Firefox, using Google Research's Rust-based jxl-rs decoder to provide secure, performant support. The article highlights progressive rendering and compares JPEG XL with AVIF for different image-compression use cases.

### Source excerpt

It isn't often that new image formats land in browsers. In the early 2000s we had JPEG, GIF, and PNG. The 2010s gave us WebP, which was a modest step up from JPEG. But the 2020s have given us two new image formats that are a big step up from previous formats: AVIF and JPEG [...] The post Intent to Ship: JPEG XL appeared first on Mozilla Hacks - the Web developer blog.

## New aspect-ratio CSS property supported in Chromium, Safari Technology Preview, and Firefox Nightly

DevFeed: [New aspect-ratio CSS property supported in Chromium, Safari Technology Preview, and Firefox Nightly](<https://devfeed.tech/articles/new-aspect-ratio-css-property-supported-in-chromium-safari-technology-preview-and-firefox-nightly-28736.md>)

Original publisher: [Read original article](<https://una.im/2021-01-28-aspect-ratio/>)

Published: 2021-01-28T00:00:00Z

Content type: article

Language: en

Sources: [Una Kravets](<https://devfeed.tech/sources/una-kravets.md>)

Topics: [CSS](<https://devfeed.tech/topics/css.md>), [Chromium](<https://devfeed.tech/topics/chromium.md>), [Firefox Nightly](<https://devfeed.tech/topics/firefox-nightly.md>)

Tags: [chromium](<https://devfeed.tech/tags/chromium.md>), [css](<https://devfeed.tech/tags/css.md>), [firefox-nightly](<https://devfeed.tech/tags/firefox-nightly.md>), [property](<https://devfeed.tech/tags/property.md>), [safari](<https://devfeed.tech/tags/safari.md>)

### AI overview

The article reports support for the new CSS aspect-ratio property in Chromium, Safari Technology Preview, and Firefox Nightly. The property helps maintain spacing in responsive layouts.

### Source excerpt

The new CSS property that helps maintain spacing in responsive layouts.

## Back to Firefox (Nightly)

DevFeed: [Back to Firefox (Nightly)](<https://devfeed.tech/articles/back-to-firefox-nightly-37242.md>)

Original publisher: [Read original article](<https://muffinman.io/blog/back-to-firefox/>)

Author: Stanko

Published: 2019-09-26T00:00:00Z

Content type: opinion

Language: en

Sources: [Stanko Tadić](<https://devfeed.tech/sources/stanko-tadic.md>)

Topics: [Firefox](<https://devfeed.tech/topics/firefox.md>), [Firefox Nightly](<https://devfeed.tech/topics/firefox-nightly.md>), [macOS](<https://devfeed.tech/topics/macos.md>), [cpu](<https://devfeed.tech/topics/cpu.md>)

Tags: [battery](<https://devfeed.tech/tags/battery.md>), [cpu](<https://devfeed.tech/tags/cpu.md>), [firefox](<https://devfeed.tech/tags/firefox.md>), [firefox-nightly](<https://devfeed.tech/tags/firefox-nightly.md>), [issue](<https://devfeed.tech/tags/issue.md>), [macos](<https://devfeed.tech/tags/macos.md>), [rant](<https://devfeed.tech/tags/rant.md>), [release](<https://devfeed.tech/tags/release.md>), [stable](<https://devfeed.tech/tags/stable.md>), [version](<https://devfeed.tech/tags/version.md>)

### AI overview

The author returns to Firefox after a MacOS scaled-resolution issue that caused very high CPU usage and battery drain was fixed. The fix was expected to reach stable Firefox 70 in late October 2019, while Firefox Nightly offered an earlier, potentially unstable version.

### Source excerpt

Two years ago I wrote this rant. Firefox had a problem on MacOS on scaled resolutions, resulting in insanely high CPU usage and battery drain. Issue is finally fixed, and I'm happy to say I'm using it again. The fix is expected to land in the stable version in late October 2019, with the release of Firefox 70. Meanwhile you can download Firefox Nightly, which is the freshest (and sometimes unstable) version of Firefox. I'm really happy to be using Firefox again, and I think you should try it as well.