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  • Compacting Garbage Collection in SpiderMonkey

    Overview Compacting is a new feature of our garbage collector, released in Firefox 38, that allows us to reduce external fragmentation in the JavaScript heap. The aim is to use less memory in general and to be able to recover from more out-of-memory situations. So far, we have only implemented ...

  • How fast are web workers?

    The next version of Firefox OS, the mobile operating system, will unleash the power of devices by taking full advantage of their multi-core processors. Classically, JavaScript has been executed on a single thread, but web workers offer a way to execute code in parallel. Doing so frees the browser of ...

  • Streaming media on demand with Media Source Extensions

    Introducing MSE Media Source Extensions (MSE) is a new addition to the Web APIs available in all major browsers. This API allows for things like adaptive bitrate streaming of video directly in our browser, free of plugins. Where previously we may have used proprietary solutions like RTSP (Real Time Streaming ...

  • Trainspotting: Firefox 39

    Trainspotting is a series of articles highlighting features in the lastest version of Firefox. A new version of Firefox is shipped every six weeks – we at Mozilla call this pattern “release trains.” A new version of Firefox is here, and with it come some great improvements and additions to ...

  • Performance Testing Firefox OS With Raptor

    When we talk about performance for the Web, a number of familiar questions may come to mind: Why does this page take so long to load? How can I optimize my JavaScript to be faster? If I make some changes to this code, will that make this app slower? I’ve ...

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