Summary: Per this spec issue, csswg-draft#8403, we'd like to extend the syntax of text-decoration

I am concerned about lossless JPEG XL performance. In my measurements it is 30x slower to decode than

Summary: named-feature() is an @supports function that lets authors detect features that cannot be

Summary: When an anchor element is transformed, the anchor-positioned element's position and size

Hi folks, We've just landed a change[0] that should make life easier for those doing native

As of Firefox 155, we intend to enable the WebAssembly wide arithmetic proposal by default on all

As of Firefox 155, we intend to enable the WebAssembly compact import section encoding by default on

Summary: Change the consumption steps of the Sanitizer API so that it sanitizes during parse steps,

Hey Firefox devs! Migration of Firefox's CI to Github is officially underway. If you inspect the

Summary: Per CSSWG resolution, the `display` property is now discretely animatable, in both CSS

As of Firefox 155, I intend to enable the CSS alpha() relative color function on all platforms. This

Summary: Introduces the <a> element within the MathML namespace exposed via the new

Summary: The CSS at-rule() function for the @supports at-rule allows authors to detect browser

We should add a link to the MDN page for the header in DevTools Netmonitor. Filed https://bugzilla.

Summary: The Audio Session API lets web apps declare their audio intent and observe the system audio

Hi Martin! We are actively looking at a related project called Web Application Integrity, Consistency

Hi all, tl;dr: We are tentatively turning of Try support in old Lando. Please reach out to #Conduit

As of Firefox 155, I intend to turn the CSS progress() function on by default on all platforms. This

Hello, When a patch lands and causes a performance regression in our performance tests, authors are

Cornelius felt strange about thanking himself, but I'd like to point out that he is a volunteer,

As of Firefox 155, I intend to turn advanced attr() on by default on all platforms. It has been

Summary: CSS Typed Arithmetic enhances the type checking capabilities of calc() and other math

As of Firefox 154, I intend to turn the text-box-trim / text-box-edge (and associated text-box

Welcome to the Q2 2026 edition of the Firefox Security & Privacy Newsletter. Security and privacy

Welcome to the Q2 edition of the Engineering Effectiveness Newsletter! The Engineering Effectiveness

Hi everyone, We are planning to move Firefox Desktop and Android from a 4-week release cadence to a 2

Summary: margin-trim lets a container suppress the margins of its child content where those margins

Yes, I have a patch up for review in https://bugzilla.mozilla.org/show_bug.cgi?id=2048561 ; sorry for

In an effort to make Beta builds more representative of release candidate builds and avoid

This took a while to land (due to other priorities and blockers that came up), but it has stuck now.