@namespace url(http://www.w3.org/1999/xhtml);
 
@-moz-document domain("mail.google.com") {
  div.CX span, 
  div.LrBjie a, 
  div.zw a, 
  div.n6 span, 
  div.nM a {
     color: #666 !important;
  }
  
  div.CX div.z8 span {
     color: #000 !important;
  }
  
  div.nZ a {
     color: #fff !important;
  }
}