Nice, but... Rated 3 out of 5 stars

This theme has a lot potential.
The icons are clean and sleek and it's a sharp theme overall but, there are some issues that need addressing. Aside from what others have mentioned, there is no mouse over effect on tabs and there isn't a clear distinction between tabs either so it's hard to identify which tab is the focused one and which are background tabs. Also, there is no hover effect on the back and forward buttons but there is on the other ones. And finally, there are at least 3 issues in the Options panel that needs addressing.
All in all, it'll be a great theme when it is fixed.

This review is for a previous version of the add-on (1.0.0.1).