Using in FF4 Rated 4 out of 5 stars

I have been using AnyColor in FF4, but you need to disable the compatibility check
http://tinyurl.com/4gezrtg
or use the Nightly Tester Tools add-on and use the option there to Force Addon Capatibility. The only issue then that I have found is that every time you start Firefox, in addition to your home page, you get a welcome to Anycolor in another tab.