Another add-on I was using for several years to better distinguish visited links from the awful purple (visited) links, which is very hard to distinguish from blue (unvisited) no longer works with recent versions of Firefox. Who thinks blue and purple are good colors? Making visited links gray better differentiates the links as compared to the default of purple, but does not always provide the contrast I need/desire. I am begging this developer to allow users to set their own color for visited links. Then it would be a 5 star add-on. Thanks.