Link Control od Inner Monk Design

No more trying to tell the difference between blue and dark-purple at 2AM with NightShift on.

Easily change the color of your previously visited links using the predefined colors or choose your own. Use the included blacklist to prevent Link Control from running on certain sites.

Good for users who have a tough time with colors or are color-blind - as you can choose exactly the color you want. For me I work a lot at night and have a tough time distinguishing the colors of regular links vs visited links. It started costing me time so I decided I would make this extension to help out.