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  1. 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…

  2. Firefox Developer Edition 38: 64-bits and more

    In celebration of the 10th anniversary of Firefox, we unveiled Firefox Developer Edition, the first browser created specifically for developers. At that time, we also announced plans to ship a 64-bit version of Firefox. Today we’re happy to announce the next phase of that plan: Read more…

  3. Birdsongs, Musique Concrète, and the Web Audio API

    In January 2015, my friend and collaborator Brian Belet and I presented Oiseaux de Même — an audio soundscape app created from recordings of birds — at the first Web Audio Conference. In this post I’d like to describe my experience of implementing this app Read more…

  4. WebRTC requires Perfect Forward Secrecy (PFS) starting in Firefox 38

    Today, we are announcing that Firefox 38 will take further measures to secure users’ communications by removing support in WebRTC for all DTLS cipher suites that do not support forward secrecy. For developers: if you have a WebRTC application or server that doesn’t support PFS Read more…

  5. Synchronous Execution and Filesystem Access in Emscripten

    Emscripten helps port C and C++ code to run on the Web. When doing such porting, we have to work around limitations of the web platform, one of which is that code must be asynchronous: you can’t have long-running code on the Web, it must Read more…

  6. What’s new in Web Audio

    Introduction It’s been a while since we said anything on Hacks about the Web Audio API. However, with Firefox 37/38 hitting our Developer Edition/Nightly browser channels, there are some interesting new features to talk about! This article presents you with some new Web Audio tricks Read more…

  7. Introducing @counter-style

    Introduction The characters that indicate items in a list are called counters — they can be bullets or numbers. They are defined using the list-style-type CSS property. CSS1 introduced a list of predefined styles to be used as counter markers. The initial list was then slightly extended Read more…

  8. Exploring object-fit

    On web documents, a common problem concerns the display of different sized images (or videos) in the same place. Perhaps you are writing a dynamic gallery app that accepts user submissions. You can’t guarantee that everyone will upload images of exactly the same aspect ratio, Read more…

  9. Embedding an HTTP Web Server in Firefox OS

    Nearing the end of last year, Mozilla employees were gathered together for a week of collaboration and planning. During that week, a group was formed to envision what the future of Firefox OS might be surrounding a more P2P-focused Web. In particular, we’ve been looking Read more…

  10. Open Web Apps feedback: Consolidating our channels

    In August 2014 we announced the opening of a new feedback channel for web apps on UserVoice. It has led to some good discussions and here are a few highlights: This post showed the importance of the nascent FileSystem API. A suggestion about background services Read more…