Firefox Browser Developer Edition

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

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, plus experimental 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