f.lux is makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day.
Dark Reader generates dark themes for websites on the fly. Use the night mode to take care of your eyes. Adjust brightness and contrast to better fit your screen.
Darker Medium applies a customizable dark theme to *all* medium formatted stories. You can customize the header background, main accent color, highlight color and link styles separately from the option menu. No matter the domain, if a site is using Medium, it will get a dark theme; that is the main advantage over Stylus and Stylish.
Darkness is a browser extension that provides beautiful dark themes for popular websites such as Google, Facebook, Gmail, Twitter, and dozens of others
Stylus is a fork of Stylish that can be used to redesign the web. The objective in creating Stylus was to remove any and all analytics, and return to a more user-friendly UI. This is why we named the extension with an "us" ending, as in the actual users.