Charcoal: Dark Mode for Messenger
Use Charcoal to ease your eyes while using Messenger and talking to your friends. Toggling dark mode with any theme is easy: click on the Messenger icon on the top left of the web page, and set your preference. Features: Messenger icon toggle on the top left of the web page to access preferences. Choose between 3 themes: Charcoal, Midnight, and Deep Blue. Toggle the extension on or off entirely, whenever you want.