Customize the color of visited links in Google’s search results in Firefox

Ok, if you’re like me, then the visited links must look very similar to each other in the latest version of Google’s search results. I’ve found a great Firefox plug in that lets you customize CSS styles for certain sites: Stylish 1.2.6
by Jason Barnabe

This is the code that I use in it:

@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("www.google.com") {
  a:visited{color:#666 !important}
}