Firefox Browser Developer Edition

Welcome to your new favourite browser. Get the latest features, fast performance, and the development tools you need to build for the open web.

Your system may not meet the requirements for Firefox, but you can try one of these versions:

Firefox Developer Edition is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox Developer Edition is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox Privacy Notice

Using Debian, Ubuntu or any Debian-based distribution?
You can set up our APT repository instead.

Firefox Developer Edition automatically sends feedback to Mozilla. Learn more

Firefox Browser Developer Edition

The browser made for developers

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 or Beta Firefox.

Preferences tailored for web developers: Browser and remote debugging are enabled by default, as are the dark theme and developer toolbar button.

Design. Code. Test. Refine.

Build and Perfect your sites
with Firefox DevTools

Speak up

Feedback makes us better. Tell us how we can improve the browser and Developer tools.

Join the conversation

Get involved

Help build the last independent browser. Write code, fix bugs, make add-ons, and more.

Start now

Download the Firefox browser made for developers