Rated 4.6 out of 5
4.6 Stars out of 5
by Firefox user 12249856, a year ago
Rated 5 out of 5
I have used this add-on for two years now. It allows me to work in front of a computer for hours (it saved my eyes). I use it on a Windows laptop, a Surface Pro, and my Android phone. I also, added to my desktop computer at work. Terrific contribution to mankind! Thank you Mikhail.