Very gratifying! Rated 5 out of 5 stars
I've used this skin for a long time with FF2 and the options add-on has made it even better. It's productivity boost far outshines any possible (always subjective) aesthetic drawbacks.
To the developer: I strongly second the notion of having a tab height option since I use "TreeStyleTabs" and so my tabs are arranged vertically and at their tiny current height, it takes too much concentration to click them accurately. In such a setup, a whole second sidebar is reserved for the tabs anyway, so there is usually plenty of unused vertical space.
Thanks for all the hard work!