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  1. Compiling to JavaScript, and Debugging with Source Maps

    • by and • Debugging, Developer Tools, Firefox, Firefox Aurora, Firefox Nightly, JavaScript, Node.js • 1 comment

    This is a tutorial on how to write a compiler which generates JavaScript as its target language, and maintains line and column meta-data in source maps for debugging. Storing line and column coordinates in a source map allows the end-user of the compiler to debug Read more…

  2. Firefox Developer Tool Features for Firefox 23

    • by and • Developer Tools, Featured Article, Firefox Aurora, Firefox Nightly • 16 comments

    Another uplift has left the building and it’s time to take a look at what’s in Firefox Developer Tools in Firefox 23 currently Aurora, our pre-beta channel. You can download it from the Aurora Download page today. Firefox 23 is currently scheduled to hit the Read more…

  3. Firefox OS Simulator 3.0 released

    • by and • Developer Tools, Featured Article, Firefox OS • 36 comments

    About 6 weeks ago, we wrote about the preview of Firefox OS Simulator 3.0 and now we’re happy to release it! New features In our preview coverage, we listed the new features for this version: Push to Device Rotation simulation Basic geolocation API simulation Manifest Read more…

  4. Developer Tools Update – Firefox 22

    • by • Developer Tools, Firefox • 36 comments

    This is the first in a series of posts published on or about the time a new Firefox version graduates from ‘Nightly’ status and becomes Firefox Aurora. We think that is the absolute best time to let you know about all the cool new developer-related Read more…

  5. Firefox Developer Tools work week wrap-up

    • by and • Add-ons, Developer Tools, Firefox • 21 comments

    Last week in Sunnyvale we had the first Developer Tools work week to include the recently-integrated Jetpack team ( for a slightly different take on the week, see Paul’s post. ). And what a week! I was a bit shocked by how many things I Read more…

  6. Font Inspector and <time> and <data> elements – Firefox Development Highlights

    • by and • Bleeding edge, Developer Tools, Firefox Development Highlights • 5 comments

    Time for another look at the latest developments with Firefox. This is part of our Bleeding Edge and Firefox Development Highlights series, and most examples only work in Firefox Nightly (and could be subject to change). Font Inspector A Font Inspector is now available in Read more…

  7. Writing Web Apps Quickly With Mortar

    • by • Apps, Developer Tools, Featured Article, Firefox OS • 11 comments

    With the introduction of Firefox OS, development of an open apps marketplace, and a push to implement powerful web APIs for closer hardware integration, Mozilla is serious about web apps. We believe that the web can deliver an experience similar to native apps, even on Read more…

  8. The Web We Lost, Heroku Automates Automation, Why moving elements with translate() is better – Hacks Weekly

    • by • CSS, Developer Tools, Mozilla Hacks Weekly • 2 comments

    The Web We Lost, Heroku Automates Automation, Why moving elements with translate() is better and more this week from Mozilla’s Developer Engagement Read more…

  9. Firefox OS Simulator 1.0 is here!

    • by • Developer Tools, Featured Article, Firefox OS • 55 comments

    Three weeks back, we introduced the Firefox OS Simulator, a tool that allows web developers to try out their apps in Firefox OS from the comfort of their current Windows/Mac/Linux computers. We’ve seen a number of comments from people who used the Simulator as an Read more…

  10. Announcing the prototype Firefox OS Simulator

    • by • Apps, Boot to Gecko (B2G), Developer Tools, Firefox OS • 31 comments

    Firefox OS (and the Boot2Gecko (B2G) project on which it is based) has been written about extensively on Hacks already, but the brief summary is that Mozilla is building a mobile phone operating system where the whole user interface is built on web technology (HTML, Read more…