Firefox for Web Developers

@FirefoxWebDevs

Official Firefox account for people who build on the web. Learn about the things we're working on to grow and improve the web platform.

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hacks.mozilla.org

Joined June 2009

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90.1K Followers

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Firefox for Web Developers
@FirefoxWebDevs
Oct 13
Firefox 158 landed today! For web devs: 🎉 JPEG XL support, including full progressive rendering. 🎉 'navigate' on notifications, so they can go to a URL without firing events. 🎉 WebGPU's float32-blendable 🎉 WebGL's EXT_polygon_offset_clamp And more!
developer.mozilla.org
Firefox 158 release notes for developers (Stable) - Mozilla | MDN
This article provides information about the changes in Firefox 158 that affect developers. Firefox 158 was released on October 13, 2026.
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Firefox for Web Developers
@FirefoxWebDevs
Oct 12
We've loved seeing folks post their rankings, so we've added a share button! You can either share your list via the site directly, or copy your list as markdown/html for your own blog.
2027 Web Platform Feature Ranking
From interop-rank.fxdx.dev
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Firefox for Web Developers
@FirefoxWebDevs
Oct 8
What do you want us to work on in 2027? Here's a web app where you can rank the Interop proposals you care about, giving us data we can use to prioritise feature development.
2027 Web Platform Feature Ranking
From interop-rank.fxdx.dev
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Firefox for Web Developers
@FirefoxWebDevs
Sep 29
Firefox 157 has landed, and includes a couple of useful CSS features: 🎉 at-rule() in @supports - limit rules to browsers that support a given at-rule. 🎉 overscroll-behavior: chain - allow chained scrolling without overscroll effects. …And more!
developer.mozilla.org
Firefox 157 release notes for developers - Mozilla | MDN
This article provides information about the changes in Firefox 157 that affect developers. Firefox 157 was released on September 29, 2026.
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Firefox for Web Developers
@FirefoxWebDevs
Sep 10
When and how CSS custom property values are calculated might not be what you expect, and it has a big impact on your styles…
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