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  1. Developer Edition 42: Wifi Debugging, Win10, Multiprocess Firefox, ReactJS tools, and more

    Firefox 42 has arrived! In this release, we put a lot of effort into the quality and polish of the Developer Edition browser. Although many of the bugs resolved this release don’t feature in the Release Notes, these small fixes make the tools faster and Read more…

  2. Developer Edition 41: View source in a tab, screenshot elements, HAR files, and more

    When we introduced the new Performance tools a few weeks ago, we also talked about how the Firefox Dev Tools team had spent a lot of time focusing on user feedback and what we call ‘polish’ bugs – things reported via our UserVoice feedback channel Read more…

  3. New Performance Tools in Firefox Developer Edition 40

    Today Mozilla is pleased to announce the availability of Firefox Developer Edition 40 (DE 40) featuring all-new performance tools! In this post we will cover some of DE 40’s new developer tools, fixes, and improvements made to existing tools. In addition, a couple of videos Read more…

  4. Power Surge – optimize the JavaScript in this HTML5 game using Firefox Developer Edition

    The Firefox Developer Tools team wanted to find a fun way to show off the great performance tools we’ve just added to the Firefox Developer Edition browser. We partnered with Przemysław Sikorski (aka rezoner) author of Playground.js and the arcade puzzle game QbQbQb, to create Read more…

  5. Developer Edition 40: Always active network monitoring, CSS rules filtering, and much more

    Firefox 40 was just uplifted, and we have a lot of updates to share. This release took a major effort by Developer Tools contributors to address feedback we’ve heard directly from people using our tools. Grab a copy of the Developer Edition browser and check Read more…

  6. RDP Inspector: An extension for Firefox Developer Tools

    RDP Inspector is a Firefox extension that intercepts the Remote Debugging Protocol (RDP) and allows inspection of all data sent and received. This extension is useful for anyone who wants to extend native developer tools in Firefox by implementing new remotable features or for those Read more…

  7. WiFi Debugging for Firefox OS

    I am excited to announce that we’re now shipping WiFi debugging for Firefox OS! It’s available in Firefox OS 3.0 / master with Firefox Nightly on desktop. WiFi debugging allows WebIDE to connect to your Firefox OS device via your local WiFi network instead of Read more…

  8. Drag Elements, Console History, and more – Firefox Developer Edition 39

    Quite a few big new features, improvements, and bug fixes made their way into Firefox Developer Edition 39. Update your Firefox Developer Edition, or Nightly builds to try them out! Inspector The Inspector now allows you to move elements around via drag and drop. Click Read more…

  9. Pixel Perfect 2: extension for Firefox Developer Tools

    Pixel Perfect is a Firefox extension that enables web designers to overlay a web page with semi-transparent images (layers). The designer can then tweak the page’s content until it exactly matches the Read more…

  10. What do you want from your DevTools?

    Every tool starts with an idea: “if I had this, then I could do that faster, better, or more easily.” The Firefox Developer Tools are built atop hundreds of those ideas, and many of them come from people in the web development community just like Read more…