Rated 3 out of 5 stars
I have installed it couple of times, but uninstalled later on when I found the colors are gone between sessions. I think I might have too many windows and hundreds of tabs. If there's only one window, there's no problem at all. I even reinstall a brand new firefox to test the problem, but unfortunately, the result is still the same.
Another annoying issue is the update notice tabs are filled on every windows. That's really annoying!