The new Firefox DevTools are powerful, flexible, and best of all, hackable. This includes a best-in-class JavaScript debugger, which can target multiple browsers and is built in React and Redux.

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 …

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 …

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 …

Mar 18, 2024 · Firefox Developer Edition is a special version of the Mozilla Firefox browser designed for web developers. It contains powerful features to help developers build and debug …

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

Feb 14, 2025 · Firefox’s new web developer features, in combination with awesome web-developer add-ons like Firebug and the Web Developer Toolbar, make Firefox an ideal …

Open the main Firefox menu using the button at the top right of the window. Towards the bottom of the menu you should see an entry labelled Web Developer. Clicking this will open the …

Oct 29, 2025 · This resource provides a structured set of tutorials teaching the essential skills and practices for being a successful front-end developer, along with challenges and further …

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.