gecko-dev/themes/classic/communicator/mac/formatting.css

/* class for text with a 'link' appearance */
.text-link
  {
    color                 : #666699;
    text-decoration       : underline;
  }
  
.text-link:hover
  {
    color                 : #333366;
  } 
  
.text-link:hover:active
  {
    color                 : #990000;
  }