Works good - 4/5 stars because it changed the theme for the rest of the browser and didn't seem as dark; once I changed the firefox theme back to default the developer tools kept the new dark theme and it looks as expected. Perhaps find a way to make us not have to change the browser theme back OR duplicate the firefox's default dark theme for the browser side.

This should really be a factory feature; ie if Firefox is set to dark then developer should just be dark; Chrome does this..

Would be nice to have a a few more themes for the inspector code.

Better than other "dark themes."
Visible [+] new tab vs. the accursed default white on white--and is next to tabs not right edge of toolbar. It's just not too dark. Good Job! good theme.