@namespace url(http://www.w3.org/1999/xhtml);
/* ==UserStyle==
// @name         Visited hyperlinks with opacity effect
// @author       Roblesolido
// @description	 Changes the links with a semi-opaque effect.
// ==/UserStyle==*/

a[href]:visited
{ 
 opacity:0.5 !important;
}
a[href]:visited:hover
{ 
 opacity:1.0 !important;
}