Twinkle Tray - Easily manage the brightness of your monitors in Windows from the system tray.
Stylebot - Change the appearance of websites instantly. Preview and install styles created by other users on stylebot.me
Dimmer - A very small and free utility for Windows to reduce brightness on LCD/TFT screens.
Dark Reader - Reduce eye strain in your browser with this extension that provides a dark theme for browsing.
PangoBright - Screen dimming software that allows you to control the brightness of your laptop screens as well as external monitors.
Stylus - User Styles Manager - Stylus is a userstyles editor and manager based on the source code of Stylish version 1.5.2.