1
How Firefox Got Fast Again
Over the past seven months, we’ve been rapidly replacing major parts of the engine, introducing Rust and parts of Servo to Firefox. Plus, we’ve had a browser performance strike force ...
Mozilla Hacks
Mozilla Hacks is written for web developers, designers and everyone who builds for the Web. Hacks is produced by Mozilla's Developer Relations team and features hundreds of posts from Mozilla ...
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Visit hacks.mozilla.org → RSS feedOn Hacker News May 2010 – May 2026
Web & Frontend 170Software Engineering 69Tools & Productivity 44Systems & Performance 35Tech Industry & Business 31Security & Privacy 19
2
Firefox 70
Firefox 70 is released today, and includes great new features such as secure password generation with Lockwise and the new Firefox Privacy Protection Report, as well as cool additions for ...
3
Firefox 66 to block automatically playing audible video and audio
Unsolicited volume can be a great source of distraction and frustration for users of the web. So we are making changes to how Firefox handles playing media with sound and ...
4
Hello Chrome, it’s Firefox calling
Mozilla is excited to announce that we’ve achieved a major milestone in WebRTC development: WebRTC RTCPeerConnection interoperability between Firefox and Chrome. This effort was made possible because of the close ...
5
Firefox 64 Released
The year's last release of Firefox bundles together goodies for all, including multi-tab management in the interface, new CSS features, devtools improvements, better privacy protections, add-ons updates, and much, much ...
6
Calls between JavaScript and WebAssembly are finally fast
At Mozilla, we want WebAssembly to be as fast as it can be. This started with its design, which gives it great throughput. Then we improved load times with a ...
7
The web at maximum FPS: How WebRender gets rid of jank
The Firefox Quantum release is getting close. It brings many performance improvements, including the super fast CSS engine that we brought over from Servo. But there’s another big piece of ...
8
Saying Goodbye to Firebug
The most popular and powerful web development tool. Firebug has been a phenomenal success. Over its 12-year lifespan, the open source tool developed a near cult following among web developers. ...
9
The Baseline Interpreter: A Faster JavaScript Interpreter in Firefox 70
Modern web applications load and execute a lot more JavaScript code than they did just a few years ago. While JIT (just-in-time) compilers have been very successful in making JavaScript ...
10
Making WebAssembly a first-class language on the Web
This post is an expanded version of a presentation I gave at the recent WebAssembly CG meeting in Munich. WebAssembly has come a long way since its first release in 2017. The 1.0 version of WebAssembly was already a great fit for low-level languages like C and C++, and immediately enabled many new kinds of…
11
Inside a fast CSS engine
Project Quantum is a major rewrite of Firefox’s internals to make Firefox fast. We’re swapping in parts from our experimental browser, Servo, and making massive improvements to other parts of ...
12
Firefox got faster for real users in 2023
We’ve been working hard on making Firefox even faster and we’re extremely happy to report that this has resulted in an improvement in speed.
13
Firefox 73
Today we’ve released Firefox 73, with useful additions that include CSS and JavaScript updates, and numerous DevTools improvements. We’ve added to CSS logical properties, pushed performance forward in the Console ...
14
MDN Plus
Today, we are launching MDN Plus, our first step to providing a personalized and more powerful experience.
15
Mozilla WebThings
Mozilla WebThings is an open platform for monitoring and controlling devices over the web.
16
Sneak Peek at WebAssembly Studio
WebAssembly.Studio is an online IDE (integrated development environment) that helps you learn and teach others. It’s also a Swiss Army knife that comes in handy whenever working with WebAssembly (WASM). ...
17
Private by Design: How We Built Firefox Sync
Firefox Sync by default protects all your synced data so Mozilla can’t read it. We built Sync this way because we put user privacy first. How it works is...
18
WebAssembly’s post-MVP future
People have a misconception—they think that the WebAssembly that landed in browsers back in 2017—is the final version. In fact, we still have many use cases to unlock, from heavy-weight ...
19
A Classic Extension Reborn: Tree Style Tab
Yuki “Piro” Hiroshi is a trailblazer and a true do-it-yourselfer. Whenever the Tokyo-based programmer gets irritated with any aspect of his browsing experience, he builds a workaround for himself and ...
20
QUIC and HTTP/3 Support Now in Firefox Nightly and Beta
Support for QUIC and HTTP/3 is now enabled by default in Firefox Nightly and Firefox Beta. HTTP/3 will be available by the end of May.
21
A few HTML tips
A while ago I wrote an article with some CSS tips, now it’s time to give some polish to our HTML! In this article I’ll share some tips and advice ...
22
Introducing the Firefox debugger.html
debugger.html is a modern JavaScript debugger from Mozilla, built as a web application with React and Redux. This project was started early this year in an effort to replace the ...
23
WebIDE lands in Firefox Nightly
Editor's note: if you want to help test it on a recent nightly you can toggle the devtools.webide.enabled preference in about:config. The WebIDE is available today under Tools>Web Developer>App Manager ...
24
Technical Details on the Recent Firefox Add-On Outage
Recently, Firefox had an incident in which most add-ons stopped working. This was due to an error on our end: we let one of the certificates used to sign add-ons ...
25
CSS Grid for UI Layouts
In this article I’ll show you how to use CSS Grid to improve application layouts that need to respond and adapt to user interactions and changing conditions, and always have ...
26
Firefox 41 can screenshot a single DOM element
Trainspotting is a series of articles highlighting features in the lastest version of Firefox. A new version of Firefox is shipped every six weeks – we at Mozilla call this ...
27
Firefox Developer Tools – Editable box model, Sublime Text keys
A new set of the Firefox Developer Tools features has just been uplifted to the Aurora channel. These features are available right now in Aurora, and will be in the ...
28
Tab Unloading in Firefox 93
Firefox will monitor available system memory and, should it become that a crash is imminent, Firefox will respond by unloading memory-heavy.
29
A cartoon intro to DNS over HTTPS
At Mozilla, we closely track threats to users' privacy and security. This is why we've added tracking protection to Firefox and created the Facebook container extension. In today's cartoon intro, ...
30
Firefox’s New WebSocket Inspector
The Firefox DevTools team and our contributors were hard at work over the summer, getting Firefox 70 jam-packed with improvements. We are especially excited about our new WebSocket inspection feature. ...