Firefox news — Web Standards

March 24

Firefox 149 release notes for developers

Popover hint, CloseWatcher, shape-outside: xywh(), and more CSS and API updates.

February 27

Component model could remove JS glue, simplify loading, and speed up web API access.

February 25

HTML sanitizer, Trusted Types, CSS shape(), and more.

January 14

CSS anchor positioning, Navigation API, WebGPU on Apple Silicon, and DevTools improvements.

December 10, 2025

CSS and MathML improvements plus new APIs and Navigation API preview.

November 12, 2025

New CSS, JS and media features plus experimental security and layout APIs.

October 16, 2025

View Transitions in SPAs, command/commandfor attributes, getOrInsert(), and moveBefore().

September 18, 2025

New color formats in color input, ::details-content, ::before::marker, and grid improvements.