Firefox: How to Disable Visited Link Color

How to turn off visited links (the purple color that links become after clicking on them) in Firefox:

1. Type in about:config in the address bar and press enter.
2. Press I accept the risk! if a warning appears.
3. Search for "visited" and look for layout.css.visited_links_enabled.
4. Right-click on the row and select Toggle.
5. This will set the value to false, and visited links will no longer appear in a purple color.

Watch the video tutorial