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.
Sblack is a little free Mac app that applies a Dark Theme to Slack for Mac to make it easier on your eyes. Just drag and drop and you're done!
Darkness is a Chrome extension that provides dark themes for popular websites
Dark Mode List is a list of apps and sites that support dark mode
Darkness is a browser extension that provides beautiful dark themes for popular websites such as Google, Facebook, Gmail, Twitter, and dozens of others
Enjoy Instagram web in the new night blue colors and protect your eyes
Dark Mode for Safari is an extension, similar to Google Chrome extensions, that provides a better way to enjoy surfing the web by using a dark theme.
Berry is the iPhone and iPad browser that automagically makes all websites dark, blocks ads/trackers, increases battery life, and much more. Berry even includes a Today widget and dark keyboard that can be used in any app.
The entire page will be fading to dark, so you can watch the videos as if you were in the cinema. Works for YouTube™ and Beyond.
With a single click on the lamp button, the page will fade to dark. And automatically focus on the video. By clicking on it again, the page will return to normal.
Turn Quora UI into dark mode for ease on the eyes and improved readability.