Mozilla Blog

Goodbye, EdgeHTML

Microsoft is officially giving up on an independent shared platform for the internet. By adopting Chromium, Microsoft hands over control of even more of on

Firefox Quantum Lands in Beta, Developer Edition

Engines are important, both in cars and in browsers. That’s why we’re so revved up this morning – we’re releasing the Beta of a whole new Firefox,

Firefox desktop extensions coming soon for the upcoming Android release

In the coming months Mozilla will launch support for an open ecosystem of extensions on Firefox for Android on addons.mozilla.org (AMO). We’ll announce a definite launch date in early September, ...

WebAssembly support now shipping in all major browsers

While Mozilla has been preparing to launch Firefox Quantum, its fastest browser yet, some notable developments have happened with WebAssembly, the binary f

Extensions in Firefox 59

Firefox Quantum continues to make news as Mozilla incorporates even more innovative technology into the platform. The development team behind the WebExtensions architecture is no exception, landing a slew of ...

Update Regarding Add-Ons in Firefox

Incident summary Updates - Last updated 14:35 PST May 14, 2019. We expect this to be our final update. If you are running Firefox versions 61 - 65 ...

Firefox fixes save gigabytes of memory on image-heavy pages

Lots of important MemShrink stuff has happened in the last 27 days: 22 bugs were fixed , and some of them were very important indeed.

Firefox for Mobile now supports NoScript, PrivacyBadger, HTTPS Everywhere

Back in February, we announced support for the first extension for Firefox Preview, the new and rebuilt mobile browser for Android that is set to replace Firefox for Android later ...

Mozilla Welcomes the Rust Foundation

Today Mozilla is thrilled to join the Rust community in announcing the formation of the Rust Foundation. The Rust Foundation will be the home of the popula

Firefox to Discontinue Sideloaded Extensions

To give users more control over their extensions, support for sideloaded extensions will be phased out starting with Firefox 73.

Introducing the ‘mozjpeg’ Project

Today I’d like to announce a new Mozilla project called ‘mozjpeg’. The goal is to provide a production-quality JPEG encoder that improves compression while maintaining compatibility with the vast majority ...

Lightspeed – A Browser Experiment

Speeding Up the Rust Compiler

I last wrote in October about my work on speeding up the Rust compiler. With the year’s end approaching, it’s time for an update.

Another Big Milestone for Servo: Acid2

Servo, the next-generation browser engine being developed by Mozilla Research, has reached an important milestone by passing the Acid2 test. While Servo is not yet fully web compatible, passing Acid2 ...

Mozilla's new Firefox Linux package for Ubuntu and Debian derivatives

Great news for Linux users, after months of testing, Mozilla released today a new package for Firefox on Linux (specifically on Ubuntu, Debian, and any Deb

The Rust compiler is still getting faster

A key theme of the Rust 2019 roadmap is maturity . This covers a variety of topics, but a crucial one is compile times. For example, the roadmap itself has the following as the first main theme for the compiler team.

How to speed up the Rust compiler one last time

Due to recent changes at Mozilla my time working on the Rust compiler is drawing to a close. I am still at Mozilla, but I will be focusing on Firefox work for the foreseeable future.

Mozilla Advances JPEG Encoding with Mozjpeg 2.0

We’re pleased to announce the release of mozjpeg 2.0. Early this year, we explained that we started this project to provide a production-quality JPEG encoder that improves compression while maintaining ...

JavaScript: Servo’s only garbage collector

pre.sourceCode { margin-left: 2em; } .sourceCode > span.k, .sourceCode > span.o, .sourceCode > span.bp, .sourceCode > span.kd { font-weight: bold; } .sourceCode > span.kt, .sourceCode > span.cp { ...

Extensions in Firefox 58

With the release of Firefox Quantum on November 14, 2017, we officially entered a WebExtensions-only world for add-on development. While that event was certainly the news of the day, Firefox ...

Firefox: Performance in Progress

In the last six months the Firefox performance team has implemented changes to improve startup, responsiveness, security (Fission), and web standards. Startup and perceived startup Doug Thayer and Emma Malysz ...

The Future of Developing Firefox Add-ons

Today we are announcing some major upcoming changes to Firefox add-ons. Our add-on ecosystem has evolved through incremental, organic growth over the years, but there are some modernizations to Firefox ...

Firefox for Android will soon support extensions

During the release cycle of Firefox 120, we’ll begin to see the emergence of dozens of new, openly available extensions on Firefox for Android on addons.mozilla.org (AMO). We’re taking a ...

How to speed up the Rust compiler in 2018

18 months ago I wrote about some work I did to speed up the Rust compiler (rustc). I’ve recently taken this work up again. Also, in the meantime rustc’s build system has been replaced and its benchmark suite has been overhauled. So it’s a good time for an update.

Mozilla’s Manifest v3 FAQ

Developers have asked what Google's proposed changes to their extensions API, known as Manifest v3, mean for Mozilla. Here are some frequently asked questions.

Firefox Nightly Gets New Baseline JIT Compiler

This wednesday we landed the baseline compiler on Firefox nightly. After six months of work from start to finish, we are finally able to merge ...

How to speed up the Rust compiler in 2020

I last wrote in December 2019 about my work on speeding up the Rust compiler. Time for another update.

Sccache, Mozilla’s distributed compiler cache, now written in Rust

If this were a diary it would have a unicorn on the cover, because unicorns are awesome.

What We're Working on in Firefox

We recently shared a number of updates with our community of users, and now we want to share them here: At Mozilla, we work hard to make Firefox the best b

How we made compiler warnings fatal in Firefox

Compiler warnings are mostly good: they identify real problems, and when false positives do occur they are usually easy to work around. However, if they’re not fatal, they tend to be ignored and build up. (See bug 187528 for an idea!)