Get to know the features that make it the most complete browser for building the Web.

  • Screenshot

    WebIDE

    Develop, deploy and debug Firefox OS apps directly in your browser, or on a Firefox OS device, with this tool that replaces App Manager.

    Learn more about WebIDE
  • Screenshot

    Valence

    Develop and debug your apps across multiple browsers and devices with this powerful extension that comes pre-installed with Firefox Developer Edition.

    Learn more about Valence

Important: Sync your new profile

Developer Edition comes with a new profile so you can run it alongside other versions of Firefox. To access your bookmarks, browsing history and more, you need to sync the profile with your existing Firefox Account, or create a new one. Learn more

Features and tools