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Messenger Black is a Chrome and Safari extension which brings Scheduled Dark Mode to Facebook Messenger on your computer. It's the only Messenger extension on the Chrome Store that lets you toggle Dark Mode manually, on a schedule, or at Sunset and Sunrise.
Messenger BlackScheduled Dark Mode for Facebook Messenger Desktop
Ryan Mohtaleft a comment
Embrace your dark side with Messenger Black, a dramatic new look for Facebook Messenger. Flip the switch and watch the background dim and your messages take center stage, becoming more vivid and easy on the eyes. And now with Scheduled and Sunset to Sunrise modes, you can tune your messaging experience to the sun's natural rhythm. This app works on both messenger.com and facebook.com/messages....
Messenger BlackScheduled Dark Mode for Facebook Messenger Desktop