All the latest developer tools in beta in addition to features like the Multi-line Console Editor and WebSocket Inspector. A separate profile and path so you can easily run it alongside Release …

Aug 18, 2025 · Our developer guide explains how to get Firefox source code, how to build it on Linux, macOS and Windows, how to find your way around, and how to contribute to the project.

Dec 5, 2016 · By using the Developer Edition, you gain access to tools and platform features at least 12 weeks before they reach the main Firefox release channel. Find out what's new in the …

Check out the Firefox browser that is built specifically for developers and modern workflows.

Jul 23, 2025 · Firefox Developer Edition is a special version of the Firefox browser designed specifically for web developers. It comes with additional tools, features, and customizations …

Experience cutting-edge browser features in pre-release versions: Firefox Developer Edition, Firefox Beta and Firefox Nightly. Download now!

Jul 22, 2025 · Firefox 142 comes with a new command to set the locale override, a few changes around handling the cookies and setting the proxy, and more!

All the latest developer tools in beta in addition to features like the Multi-line Console Editor and WebSocket Inspector. A separate profile and path so you can easily run it alongside Release …

Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile. For the latest updates to the developer tools, download Firefox Developer Edition.

Mozilla Firefox Developer Edition is easy-to-use and scorchingly quick. It's built for better debugging, and we review it in-depth here.