JavaScript Articles
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css transforms: styling the web in two dimensions
One feature that Firefox 3.5 adds to its CSS implementation is transform functions. These let you manipulate elements in two dimensional space by rotating, skewing, scaling, and translating them to alter their appearance. I’ve put together a demo that shows how some of these functions work. There are four animating objects in this demo. Let’s […]
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Warp: Improved JS performance in Firefox 83
With Warp (also called WarpBuilder) we’re making big changes to our JIT (just-in-time) compilers, resulting in improved responsiveness, faster page loads and better memory usage. The new architecture is also more maintainable and unlocks additional SpiderMonkey improvements. This post explains how Warp works and how it made SpiderMonkey faster.
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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 JavaScript data science ecosystem forward, and that's why we built and released Iodide earlier this year. In the meantime, we’re meeting data scientists where they are by bringing the popular and mature Python scientific stack to the browser.
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Intersection Observer comes to Firefox
What do infinite scrolling, lazy loading, and online advertisements all have in common? They need to know about—and react to—the visibility of elements on a page! Unfortunately, knowing whether or not an element is visible has traditionally been difficult on the Web. Most solutions listen for scroll and resize events, then use DOM APIs like […]
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Introducing 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 current debugger within the Firefox Developer Tools. Also, we wanted to make a debugger capable of debugging multiple targets and functioning in a standalone mode. […]
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ES6 In Depth: Generators, continued
ES6 In Depth is a series on new features being added to the JavaScript programming language in the 6th Edition of the ECMAScript standard, ES6 for short. Welcome back to ES6 In Depth! I hope you had as much fun as I did during our summer break. But the life of a programmer cannot be […]
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ES6 In Depth: Using ES6 today with Babel and Broccoli
ES6 In Depth is a series on new features being added to the JavaScript programming language in the 6th Edition of the ECMAScript standard, ES6 for short. ES6 is here, and people are already talking about ES7, what the future holds, and what shiny features a new standard can offer. As web developers, we wonder […]
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App Framework and Firefox OS
Intel’s App Framework is an open source, MIT licensed, cross platform HTML5 framework for building mobile applications. It is hosted on GitHub where you can contribute to the project, especially the Firefox OS theme. App Framework is comprised of three main areas. Query selector library UI/UX library Plugins The query selector library implements a subset […]
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Using JSFiddle to Prototype Firefox OS Apps
Dancing to the Tune of the Fiddle JSFiddle is a fantastic prototyping and code review tool. It’s great for getting out a quick test case or code concept without having to spool up your full tool chain and editor. Further, it’s a great place to paste ill-behaved code so that others can review it and […]
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Content Security Policy 1.0 lands in Firefox Aurora
The information in this article is based on work together with Ian Melven, Kailas Patil and Tanvi Vyas. We have just landed support for the Content Security Policy (CSP) 1.0 specification in Firefox Aurora (Firefox 23), available as of tomorrow (May 30th). CSP is a security mechanism that aims to protect a website against content […]