Rated 3 out of 5 stars

Сравнив с Colorific 5.4 и Blank Your Monitor + Easy Reading 1.9.7 от dlento предпочел последний.

This review is for a previous version of the add-on (4.1). 

Since BYM simply sets the Firefox color options, it completely wipes out functional differences between text colors and it may lead to unreadable text on top of background images.