1
Firefox’s new streaming and tiering compiler
People call WebAssembly a game changer because it makes it possible to run code on the web faster. Some speedups are already present, and some are yet to come. With ...
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
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 ...
3
Improving Firefox Responsiveness on macOS
If you're running Firefox on macOS you might have noticed that its responsiveness has improved significantly in version 103.
4
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 ...
5
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…
6
Puppeteer Support for Firefox
Puppeteer 23 now supports Firefox, simplifying browser automation and testing across both Chrome and Firefox.
7
Porting Firefox to Apple Silicon
The release of Apple Silicon based Macs at the end of last year generated a flurry of news and some surprises at the machine’s performance.
8
Improving Firefox stability on Linux
A year ago at Mozilla we started to improve Firefox stability on Linux. This effort quickly became an example of good synergies between FOSS.
9
Improving Firefox stability on Windows by retrying failed memory allocation
Poorly behaving web pages and apps are no longer capable of crashing the browser by exhausting memory, thanks to a simple trick.
10
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). ...
11
Rust 2018 is here, but what is it?
Starting today, the Rust 2018 edition is in its first release. With this edition, we’ve focused on making Rust developers as productive as they can be. Most of the language ...
12
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 ...
13
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 ...
14
Eliminating Data Races in Firefox
We successfully deployed ThreadSanitizer in the Firefox project to eliminate data races in our remaining C/C++ components.
15
Implications of Rewriting a Browser Component in Rust
Since our first release in 2002, there have been 69 security bugs in Firefox’s style component. If we'd had a time machine and could have written this component in Rust from the start, 51% wouldn't have happened. That said, Rust is not foolproof. Developers still need to be aware of correctness bugs and data leakage…
16
Standardizing WASI: A system interface to run WebAssembly outside the web
WebAssembly is an assembly language for a conceptual machine, not a physical one. This is why it can be run across a variety of different machine architectures. WebAssembly needs a ...
17
The Bytecode Alliance: Building a secure, composable future for WebAssembly
Lin Clark introduces the Bytecode Alliance, and uses Code Cartoon illustrations to share their vision of a WebAssembly ecosystem that is secure by default, fixing cracks in today’s software foundations. ...
18
Making WebAssembly better for Rust and for all languages
To be a useful as a web language, Rust needs to work well with the JavaScript ecosystem. We have some work to do to get there, and fortunately that work ...
19
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. ...
20
WebAssembly and Back Again: Fine-Grained Sandboxing in Firefox 95
In Firefox 95, we're shipping a sandboxing technology called RLBox — developed with researchers at UC San Diego and the University of Texas
21
Everything Is Broken: Shipping Rust-Minidump at Mozilla
We've been working on the development of rust-minidump. The first in this two-part series explains what minidumps are and how we made rust-minidump.
22
Pyodide: Bringing the scientific Python stack to the browser
Pyodide is an experimental project from Mozilla to create a full Python data science stack that runs entirely in the browser. We think it’s worthwhile to work on moving the ...
23
CSS Grid Level 2 – subgrid is coming to Firefox
The subgrid feature which is part of Level 2 of the CSS Grid Specification is not yet shipping in any browser, but is now available for testing in Firefox Nightly. ...
24
Building Firefox's Picture-in-Picture Support
A behind-the-scenes look at the evolution of the Picture-in-Picture player for the Firefox Desktop browser. This feature is now available for MacOS, Linux and Windows users. From the beginning, it's ...
25
What makes WebAssembly fast?
Programming with WebAssembly or JavaScript is not an either/or choice. So developers don’t need to choose between WebAssembly and JavaScript. However, we do expect that developers will swap out parts ...
26
So you want to build your own open source chatbot
A small team within Mozilla’s innovation group recently undertook a hackathon to build a trustworthy internal chatbot prototype.
27
WebAssembly Interface Types: Interoperate with All the Things
People are excited about running WebAssembly outside the browser. People are also excited about running WebAssembly from languages like Python, Ruby, and Rust. Lin Clark's Code Cartoons are back, illustrating ...
28
Faster Smarter JavaScript Debugging in Firefox DevTools
Script debugging is one of the most powerful and complex productivity features in the web developer toolbox. Done right, it empowers developers to fix bugs quickly and efficiently. The DevTools ...
29
Fluent 1.0: a localization system for natural-sounding translations
Fluent is a family of localization specifications, implementations and good practices developed by Mozilla. With Fluent, translators can create expressive translations that sound great in their language. Today we’re announcing ...
30
Compiling to WebAssembly: It’s Happening
WebAssembly is a new binary format for compilation to the web. It is in the process of being designed and implemented as we speak, in collaboration among the major browser ...