Compiler Compiler: A Twitch series about working on a JavaScript engine
Last week, I finished a three-part pilot for a new twitch stream called Compiler Compiler, which looks at how the JavaScript Specification, ECMA-262, is implemented in SpiderMonkey. JavaScript …is a...
View ArticleSafely reviving shared memory
At Mozilla, we want the web to be capable of running high-performance applications so that users and content authors can choose the safety, agency, and openness of the web platform. One essential...
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Firefox 79: The safe return of shared memory, new tooling, and platform updates
A new stable version of Firefox brings July to a close with the return of shared memory! Firefox 79 also offers a new Promise method, more secure target=_blank links, logical assignment operators, and...
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Warp: Improved JS performance in Firefox 83
Introduction We have enabled Warp, a significant update to SpiderMonkey, by default in Firefox 83. SpiderMonkey is the JavaScript engine used in the Firefox web browser. With Warp (also called...
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And now for … Firefox 84
As December ushers in the final curtain for this rather eventful year, there is time left for one more Firefox version to be given its wings. Firefox 84 includes some interesting new features including...
View ArticleJanuary brings us Firefox 85
To wrap up January, we are proud to bring you the release of Firefox 85. In this version we are bringing you support for the :focus-visible pseudo-class in CSS and associated devtools, <link...
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Pyodide Spin Out and 0.17 Release
We are happy to announce that Pyodide has become an independent and community-driven project. We are also pleased to announce the 0.17 release for Pyodide with many new features and improvements....
View ArticleImplementing Private Fields for JavaScript
This post is cross-posted from Matthew Gaudet’s blog When implementing a language feature for JavaScript, an implementer must make decisions about how the language in the specification maps to the...
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Getting lively with Firefox 90
Getting lively with Firefox 90 As the summer rolls around for those of us in the northern hemisphere, temperatures are high and unwinding with a cool ice tea is high on the agenda. Isn’t it lucky then...
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How MDN’s autocomplete search works
Last month, Gregor Weber and I added an autocomplete search to MDN Web Docs, that allows you to quickly jump straight to the document you’re looking for by typing parts of the document title. This is...
View ArticleHopping on Firefox 91
Hopping on Firefox 91 August is already here, which means so is Firefox 91! This release has a Scottish locale added and, if the ‘increased contrast’ setting is checked, auto enables High Contrast mode...
View ArticleTime for a review of Firefox 92
Release time comes around so quickly! This month we have quite a few CSS updates, along with the new Object.hasOwn() static method for JavaScript. This blog post provides merely a set of highlights;...
View ArticleLots to see in Firefox 93!
Firefox 93 comes with lots of lovely updates including AVIF image format support, filling of XFA-based forms in its PDF viewer and protection against insecure downloads by blocking downloads relying on...
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Hacks Decoded: Thomas Park, Founder of Codepip
Welcome to our Hacks: Decoded Interview series! Once a month, Mozilla Foundation’s Xavier Harding speaks with people in the tech industry about where they’re from, the work they do and what drives them...
View ArticleWebAssembly and Back Again: Fine-Grained Sandboxing in Firefox 95
In Firefox 95, we’re shipping a novel sandboxing technology called RLBox — developed in collaboration with researchers at the University of California San Diego and the University of Texas — that makes...
View ArticleImproved Process Isolation in Firefox 100
Introduction Firefox uses a multi-process model for additional security and stability while browsing: Web Content (such as HTML/CSS and Javascript) is rendered in separate processes that are isolated...
View ArticleThe JavaScript Specification has a New License
Ecma International recently approved the 2022 standard of ECMAScript. There is something new in this edition that hasn’t been part of prior editions, but this isn’t a new programming feature. In March...
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Autogenerating Rust-JS bindings with UniFFI
I work on the Firefox sync team at Mozilla. Four years ago, we wrote a blog post describing our strategy to ship cross-platform Rust components for syncing and storage on all our platforms. The vision...
View ArticleFaster Vue.js Execution in Firefox
Speedometer 3 is a cross-industry effort to build a modern browser benchmark rooted in real-world user experiences. Its goal is to focus browser engineering effort towards making the Web more smooth...
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Down and to the Right: Firefox Got Faster for Real Users in 2023
One of the biggest challenges for any software is to determine how changes impact user experience in the real world. Whether it’s the processing speed of video editing software or the smoothness of a...
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