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Rated 4 out of 5 stars
In combination with Personas or Themes, the following is useful to change the color of your bookmarks sidebar and bookmarks
Edite your userChrome.css by adding
/* only needed once */ #bookmarks-view treechildren
The 222,218,210 is something you can change depending upon what color you want as a background to your bookmarks.
See, www.tayloredmktg.com/rgb which has a chart of different colors with their three numbers (rgb code).
Using in FF4 Rated 4 out of 5 stars
I have been using AnyColor in FF4, but you need to disable the compatibility check
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.