Highlights Rév O'Conner added a settings popup to control the layout of the Inspector. Auto automatically switches the layout at a given toolbox width. The ...

Au lendemain de la sortie de Firefox 157, nous vous proposons de nous retrouver en présentiel à Mozilla Paris le mercredi 30 septembre pour une soirée dédiée aux nouvelles

Highlights Firefox 155 just released! That’s the first release that went through the full 2-week release cycle process. The WebExtensions team added a new backgrounds_area theme property so themes ...

Highlights Firefox 154 went out today! Lots of goodies in there for our users, including support for NVIDIA GeForce NOW The new 2 week release cycle is now in ...

P.S. Apologies for the delay in publishing this edition on the community blog. The original newsletter was sent to subscribers on August 27. Firefox was leveling up in August! GeForce ...

Highlights Want some Kit? Check out the store! Sebastian Zartner [:sebo] added a panel to expose @media emulation (#1692434) and provided a way to emulate ...

RESOLVED (ahale) in Core - Graphics: Color Management. Last updated 2026-09-02.

RESOLVED (sajidanwar94) in Core - CSS Parsing and Computation. Last updated 2026-08-31.

Highlights Starting in Firefox 154, we’ve added a new capability for changing the default browser icon for Windows (Windows-only, for now, and not MSIX / Store installs) in about:settings#appearance...

RESOLVED (sajidanwar94) in Core - CSS Parsing and Computation. Last updated 2026-08-06.

RESOLVED (alwu) in Core - Audio/Video: Playback. Last updated 2026-08-05.

RESOLVED (descalante) in Core - CSS Parsing and Computation. Last updated 2026-08-04.

RESOLVED (emcdonough) in Core - Print Preview. Last updated 2026-08-04.

RESOLVED (thinker.li) in Core - Widget: Gtk. Last updated 2026-08-01.

RESOLVED (sajidanwar94) in Core - CSS Parsing and Computation. Last updated 2026-08-01.

RESOLVED (mail) in Core - Networking. Last updated 2026-07-21.

RESOLVED (sajidanwar94) in Core - CSS Parsing and Computation. Last updated 2026-07-26.

RESOLVED (hsohaney) in Firefox - Profile Backup. Last updated 2026-07-21.

Firefox keeps evolving, and the community continues to play a big part in shaping what's next. In this edition, you can get an early look at Project Nova through our ...

This past May, we shared our vision for the future of Firefox. Starting today, you can try out the next design evolution of Firefox in Nightly. It's still Firefox, now ...

RESOLVED (mak) in Toolkit - Places. Last updated 2026-07-17.

RESOLVED (mconley) in Firefox - Settings UI. Last updated 2026-07-16.

RESOLVED (sajidanwar94) in Core - Layout: Block and Inline. Last updated 2026-07-15.

HDR video is coming to Firefox for Windows users (and has been available for some time on macOS).  This blog post explains how we developed the feature and gives a retrospective on the technic…

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

VERIFIED (dharvey) in Firefox - Address Bar. Last updated 2026-07-06.

Hi Mozillians, welcome to another Mozilla community roundup! This month, we’re taking a look at what’s next for Firefox. From an upcoming visual refresh and a peek behind the new ...

RESOLVED (smayya) in Core - DOM: Networking. Last updated 2026-07-02.

The HTTP No-Vary-Search response header specifies a set of rules that define how a URL's query parameters will affect cache matching. These rules dictate whether the same URL with different URL parame...

Download Russian Spelling Dictionary for Firefox. Modern Russian spell-checking dictionary for Firefox and Thunderbird.

Highlights Dao added a new Eyedropper quick action! Check it out by typing “color” or “eyedropper” in the URL bar (Bug 1803575) on Nightly. Henrik Skupin ...

Follow the pulse of the Mozilla project. Aggregated updates from the developers, designers, and volunteers building a better internet.

Firefox has been busy introducing updates across productivity, privacy and AI. From Project Nova and browser-wide AI controls to expanded privacy protectio

Highlights Maxx Crawford added a pref to hide the New Tab logo so users can opt out of branding without altering page layout or resorting to CSS overrides. Harshit ...

Highlights James enabled adaptive autofill in Nightly for testing, which we believe should provide better results in the URL bar when doing autocomplete! Jack updated the illustrations shown on ...

RESOLVED (dkeeler) in Core - Security: PSM. Last updated 2026-06-01.

Highlights The profile backup mechanism has been enabled by default for all desktop platforms in Nightly, as well as Beta! The current plan is to have this ride out ...

Support for Web Serial in Firefox 151 for Desktop Firefox can now connect directly to microcontrollers, development boards, 3D printers, power meters, and other serial-connected hardware from the…

RESOLVED (tnikkel) in Core - Graphics: ImageLib. Last updated 2026-05-22.

The redesign of Firefox Settings is now enabled by default in Nightly! With this change, we are making it easier for people to customize Firefox and discover the controls that ...

New details about what we found, and how agentic harnesses are now able to reproduce real bugs and dismiss false positives.

Highlights Import attributes will be supported for WebExtensions, starting in Firefox 150! This allows WebExtension authors to import CSS module scripts and JSON into their JavaScript modules. Ex...