Rated 5 out of 5 stars

Very nice theme if you need something that takes up the least amount of space available. The theme really doesn't deviate that far from the basics which means three things:
There is no real loss of legibility.
You do not have to relearn new icons.
If you're looking for a radical departure from the stock Firefox look and feel this might not be the best solution.

Personally, I find this a wonderful solution for my needs. Given that I don't usually have positive feelings for most of the themes I use this is really high praise from me.

This review is for a previous version of the add-on (1.8.43).