The toolbar is noticeably narrower than both Chrome and regular Firefox while adding more buttons by default. The interface changes in the Developer Edition already hint at a developer-centric approach.
Recommended Reading: How To Optimize Firefox For Better Performance User Interface It contains a multitude of debuggers, panels and other utilities, plus it uses its own profile so it can be run alongside regular Firefox more easily. Judging from the name, the official announcements and the landing page it looks like Firefox Developer Edition is the first large browser built for development, not just supporting it. Although it hasn’t been announced officially, it looks like it will be replacing Firefox Aurora at some point.
It’s a new browser aimed specifically at web developers. After a short tease, Mozilla has officially released Firefox Developer Edition.
