You will need to install a user script manager extension to install this script.
change visited & unvisited link color
if you don't like default color, change it to any valid CSS color you want
// unvisited link color let enable_link = true; let ex = "DeepPink"; let eh = "DeepPink"; // visited link color let enable_visited = true; let ex_v = "gray"; let eh_v = "gray";
because of the security risk, visited link color many not work in some browser