Firefox for Web Developers

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@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.

Global hacks.mozilla.org Joined June 2009

5.5K Following 90K Followers 8.1K Posts

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Firefox for Web Developers @FirefoxWebDevs Oct 27

Firefox 159 has landed! This is a pretty big one for web dev stuff:

🎉 CSS scroll-driven animations, both scroll() and view().
🎉 Scoped custom element registries.
🎉 Streaming sanitization of HTML.

And more! developer.mozilla.org/en-US/docs/Moz…

developer.mozilla.org Firefox 159 release notes for developers (Stable) - Mozilla | MDN This article provides information about the changes in Firefox 159 that affect developers. Firefox 159 was released on October 27, 2026.

Firefox for Web Developers @FirefoxWebDevs 5d

Scoped custom element registries are newly available in all major engines, meaning multiple implementations can use the same tag name without clashing. Here's how they work:

2:36

Firefox for Web Developers @FirefoxWebDevs Oct 28

Scroll-driven animations are newly available in all major engines! Here's how they work:

2:38

Firefox for Web Developers @FirefoxWebDevs Oct 26

JPEG XL is newly available in all major engines, but how does it stack up against other formats?

2:57

Firefox for Web Developers @FirefoxWebDevs Oct 19

What should we ship in 2027? Rank your favourite features & create your wishlist: interop-rank.fxdx.dev

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