This theme follows the K.I.S.S. principle: Keep It Simple, Stupid. Often the simplest solutions are the best and that holds true here. Everything is easy to read and, unlike many themes, you can see which tab is active easily because it has a clear, bright red line over it. That may not sound like much, but if you're like me, and have 1,504 tabs open (I really do open that many. I had to look in the history to see how many there were), it can be really hard to find your current tab in the sea of tabs. This theme solves that. Design well done.