Rated 5 out of 5 stars

This is great little gem of an add-on. I can't take the glare of WHITE, WHITE, BLAZING-WHITE webpages and normally set Firefox to override the colors-- but every now and again, I navigate toa Bank Website or some other website where a necessary button is only visible when the page displays in the webpage's colors. Now I just toggle the green color icon on the bottom and zoom about my business as before.
No. . .you can't do no-color on a Tab by Tab basis, but toggling it on & off at need is more than sufficient.

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