Rated 5 out of 5 stars

I wish everyone designing themes would follow rule #1 - Keep everything visible. Glowplug obviously knows something about what they do

This design is both beautiful AND functional.

Keep up the Good Work!

This review is for a previous version of the add-on (3.6.1). 

Readability

I really appreciate your complement but I have to point out both sides of the fence.An extension may have "color: black; background-color: white;" where only the background color succeeds.That will be my gold text on a white background - unreadable.
With that said I've taken a different approach with my themes for Firefox 4 which seems to be paying off.