It would be really nice if you could add a toggle, so it's only the active/selected tab that changes color, and not the darker, unselected part of the tab bar. (Or, at least make it possible to specify that color directly, instead of a darker shade of the environment color)
The generated color often makes other tabs harder to read, and I would prefer they just stay the same color as inactive tabs normally have, the color of the active tab and location-bar is plenty indicator of the environment I am in.