Night or Reading Mode

NoR mode – Night or Reading Mode is a smart, fast and open source add-on that automatically turns the colors of your browser content to warmer or darker.
The add-on consists of a tiny screen that allows you to control those preferences. The first switch – Reading Mode and provides you to turn the colors of your browser content to warmer. Second switch – Shadowy (Night) Mode and provides you to modify the colors of your browser content to black color.