31
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 ...
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
32
Rust and the Future of Systems Programming [video]
If you’re a regular reader of Hacks, you probably know about Rust, the ground-breaking, community-driven systems programming language sponsored by Mozilla. I covered Rust on Hacks back in July, to ...
33
Eliminating Data Races in Firefox
We successfully deployed ThreadSanitizer in the Firefox project to eliminate data races in our remaining C/C++ components.
34
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 ...
35
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…
36
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 ...
37
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 ...
38
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 ...
39
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 ...
40
Hello wasm-pack
Introducing wasm-pack, a new tool for assembling and packaging Rust crates that target WebAssembly. These packages can be published to the npm Registry and used alongside other packages. This means ...
41
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. ...
42
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.
43
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, ...
44
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 ...
45
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. ...
46
Using Immutable Caching to Speed Up the Web
The benefits of immutable caching mean that when a page is refreshed, which is an extremely common social media scenario, elements that were previously marked immutable with an HTTP response ...
47
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
48
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.
49
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 ...
50
Hardening Firefox with Claude Mythos Preview
New details about what we found, and how agentic harnesses are now able to reproduce real bugs and dismiss false positives.
51
Firefox 79
Firefox 79 offers a new Promise method, more secure target=_blank links, logical assignment operators, tooling improvements for better JavaScript debugging, and many other updates of interest to web developers. In ...
52
Goodbye InnerHTML, Hello SetHTML: Stronger XSS Protection in Firefox 148
Cross-site scripting (XSS) remains one of the most prevalent vulnerabilities on the web. The new standardized Sanitizer API provides a straightforward way for web developers to sanitize untrusted HTML before inserting it into the DOM. Firefox 148 is the first browser to ship this standardized security enhancing API…
53
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. ...
54
New Developer Tools Features in Firefox 34
A new set of 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 Firefox ...
55
An Update on MDN Web Docs
Mozilla announced some general changes in our investments and we would like to outline how they will impact our MDN platform efforts moving forward. It hurts to make these cuts, ...
56
Improved Process Isolation in Firefox 100
Firefox uses a multi-process model for additional security and stability while browsing. Web Content is rendered in separate processes.
57
Login Forms Over HTTPS, Please
Update: This feature is now also enabled in Firefox Beta, starting with Firefox Beta 50. Pretty much everyone who uses the web has used a password to log into something. ...
58
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 ...
59
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 ...
60
MDN Web Docs evolves: Lowdown on the upcoming new platform
The time has come for Kuma — the platform that powers MDN Web Docs — to evolve. “What does a Kuma evolve into? A KumaMaMa?”