Rated 5 out of 5 stars

What tru hh is said is SPOT ON. I love this theme with all my heart.

Also: Do you think you could update this for Firefox 4 compatibility?

This review is for a previous version of the add-on (0.9.7). 

Sure, I'll start working on a FF 4 version soon. Expect a version out for Firefox 4 a couple weeks after the launch of Firefox 4. Meanwhile check the development versions from the repository on the theme project website.