Firefox Developer Edition

Firefox Developer Edition 36.0 beta

Free
Firefox Developer Edition, a web browser built for those who build the Web
4.4  (26 votes)
3.4
50.0 (See all)

The only browser made just for developers, Firefox Developer Edition was created with your workflow in mind. Build, test, scale and more all from one place, for the first time ever. Inspect and debug your app across any browser or device with Valence — a powerful, pre-installed extension that you’ll only find in Firefox Developer Edition. Target screen sizes with the Responsive Design View and tweak your CSS on the fly with the built-in Style Editor for pixel-perfect coding.

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