Rated 3 out of 5 stars
I just discovered the option for color-blind people. Well, I am not color-blind. But still it is very hard for me to distinguish the two green and the two red rings. Color-blind mode doesn't make it easier. I really suggest, you use different shapes (e.g. ring, star, square, filled square, filled circle).This review is for a previous version of the add-on (20080519).