@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document url-prefix("http://") {

*[class]:hover,
*[id]:hover {
  background: rgba(128,128,128, .25); 
  border-radius: 5px;
  -moz-border-radius: 5px;
 }

/* ---- Class Inspector ---- */
*[class]:not([class="anonymous-div"]):hover::before {
  content: " ." attr(class) " ";
  color: green; text-shadow: 1px 1px 1px lime; 
  padding: .05em .25em; margin: -1em;
 } 

/* ---- ID Inspector ---- */
*[id]:hover::after {
  content: " #" attr(id) " ";
  color: darkred; text-shadow: 0px 1px 3px crimson; 
  padding: 0 .5em; margin: -0.15em; 
 }

/* ---- both ---- */
*[class]:not([class="anonymous-div"]):hover::before,
*[id]:hover::after {
  font-size: 0.8em;
  position: absolute; float: left;
  background: rgba(255,255,255, .8);
  box-shadow: 0 0 5px white;
  -moz-box-shadow: 0 0 5px white; 
  border-radius: 5px;
  -moz-border-radius: 5px;
 }

}