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  1. WebRTC in Firefox 38: Multistream and renegotiation

    Building on the JSEP (Javascript Session Establishment Protocol) engine rewrite introduced in 37, Firefox 38 now has support for multistream (multiple tracks of the same type in a single PeerConnection), and renegotiation (multiple offer/answer exchanges in a single PeerConnection). As usual with such things, there Read more…

  2. Understanding the CSS box model for inline elements

    In a web page, every element is rendered as a rectangular box. The box model describes how the element’s content, padding, border, and margin determine the space occupied by the element and its relation to other elements in the page. Depending on the element’s display Read more…

  3. How to make a browser app for Firefox OS

    Firefox OS is an operating system built on top of the Firefox web browser engine, which is called Gecko. A browser app on Firefox OS provides a user interface written with HTML5 technology and manages web page browsing using the Browser API. It also manages Read more…

  4. Using the Firefox DevTools to Debug fetch() on GitHub

    Firefox Nightly recently added preliminary support for Fetch, a modern, Promise-based replacement for XMLHttpRequest (XHR). Our initial work supported most of the Fetch Specification, but not quite all of it. Specifically, when Fetch first appeared in Nightly, we hadn’t yet implemented serializing and de-serializing of Read more…

  5. An analytics primer for developers

    There are three kinds of lies: lies, damned lies, and statistics – Mark Twain Deciding what to track (all the things) When you are adding analytics to a system you should try to log everything. At some point in the future if you need to Read more…

  6. Optimising SVG images

    SVG is a vector image format based on XML. It has great advantages, most notably it is lightweight. Since SVG is a text format, it can be viewed and modified using a simple text editor, and applying GZIP compression produces excellent results. It’s critical for Read more…

  7. This API is so Fetching!

    For more than a decade the Web has used XMLHttpRequest (XHR) to achieve asynchronous requests in JavaScript. While very useful, XHR is not a very nice API. It suffers from lack of separation of concerns. The input, output and state are all managed by interacting Read more…

  8. Ruby support in Firefox Developer Edition 38

    It was a long-time request from East Asian users, especially Japanese users, to have ruby support in the browser. Formerly, because of the lack of native ruby support in Firefox, users had to install add-ons like HTML Ruby to make ruby work. However, in Firefox Read more…

  9. Announcing the MDN Fellowship Program

    For nearly a decade, the Mozilla Developer Network (MDN) has been a vital source of technical information for millions of web and mobile developers. And while each month hundreds of developers actively contribute to MDN, we know there are many more with deep expertise in Read more…

  10. asm.js Speedups Everywhere

    asm.js is an easy-to-optimize subset of JavaScript. It runs in all browsers without plugins, and is a good target for porting C/C++ codebases such as game engines – which have in fact been the biggest adopters of this approach, for example Unity 3D and Unreal Read more…