The Developer Edition is exactly what it says on the tin: a browser built around the needs of web developers.
The Firefox team set out to bring together tools needed to keep developers productive across a multi-device and multi-platform environment, “creating a focal point to streamline your development workflow.” Though the Firefox Developer Edition has a touch of the familiar, the rejigged UI and features make it a formidable development environment while still the fully capable browser Firefox users know and love.
The biggest change you’ll notice is the dark UI of the slick inspector applied to the rest of the browser. Not your style? You can revert to the familiar light theme by heading into the Customize options at the bottom of the “hamburger” menu and clicking “Use Firefox Developer Edition Theme”.
Submitted by: Sam Tran