Quite pretty ;-) yes. I wish it also adjusted the other, gray shade. Currently something seems missing, also some of the lines in the UI seem too... too much there, I guess. I like the transitions, though.
Really good, made me love firefox more than I already did. Giving it 4 stars, bacause it sometimes doesn't work randomly and also you can't choose specific colors for given websites. For instance google is yellow...Why is it yellow all I can see is white. Also the color for a new tab is some kind of navy blue, which doesn't make too much sense.