Rated 5 out of 5 stars

Does what it says =) Tried 'PrefBar' 2 do same thing by disabling all the other features - all I wanted was a thingy 2 invert colors, so I set the prefs 2 aqua on black in the browser, & stuck this thing on the toolbar - DONE! =D

This review is for a previous version of the add-on (0.2.5).