Visited works by using your browsing history and replace color of all visited links. It's useful for any forums, webboards, image galleries or websites that don't show visited link color. Press Alt+V to mark/unmark visited links. Press Alt+Shift+V to random visited color links. Press Ctrl+Alt+Shift+V to mark/unmark image borders. For advanced options go to about:config?filter=jetpack.visited For v