Regular expressions – commonly known as RegExps – are a powerful and heavily used tool for manipulating strings in JavaScript. This post describes how we updated the RegExp engine in ...

The MDN Web Docs Learning Area teaches fundamentals of modern web development, beginning with HTML, CSS, and JavaScript essentials. In feedback this year, readers asked for a more opinionated, structured ...

Yulia Startsev, a JavaScript engineer on Firefox's SpiderMonkey team, introduces her new Twitch stream called Compiler Compiler. In the three opening interactive episodes, we get an inside look at how ...

Safari is adopting a web-based API for browser extensions similar to Firefox’s WebExtensions API making it easy to build once and port to multiple browsers. Developers

Mozilla WebThings Gateway is an open source software distribution focused on privacy, security, and interoperability. It provides a web-based user interface to monitor and control smart home devices over the ...

Firefox 78 heads heads out the door with a new regex engine, updates to the ECMAScript Intl API, new CSS selectors, enhanced support for WebAssembly, some important WebExtensions API updates, ...

A browser is an enormously complex piece of software, and it's always in development. About a year ago, we asked ourselves: how could we do better? Our CI relied heavily ...

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. ...

MDN Web Docs turns 15 years old! This celebratory article highlights fifteen big wins of the last five years. With initiatives like the browser compatibility data project, learning areas and ...

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 ...

Browsers are changing the default value of the SameSite attribute for cookies from None to Lax. This will greatly improve security for users. However, some web sites may depend (even ...

Announcing the return of the annual month-long competition for HTML5 game developers. For js13kGames contestants, the file size limit for all entries is set to 13 kilobytes of code. That's ...

Last week, 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 ...

We launched Firefox Extension Workshop, using the Ruby-based static site generator Jekyll, and then realized that we needed to find an alternative and port the site.

This post will describe my recent work on Cranelift as part of my day job at Mozilla. In this post, I will set some context and describe the instruction selection ...

We are pushing Firefox 82 out the door, with enabled support for the Media Session API, new CSS pseudo-selector behaviours and closed security loopholes.

We’ve made a lot of progress on moving forward with MDN Web Docs and we wanted to share where we are headed in the short- to mid-term.

The time has come for Kuma — the platform that powers MDN Web Docs — to evolve. “What does a Kuma evolve into? A KumaMaMa?”

We have enabled Warp, a significant update to SpiderMonkey, by default in Firefox 83. SpiderMonkey, the JavaScript engine used in the Firefox