@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document url("about:blank") {
  * {
    margin: -22px 0px 0px -22px;
    overflow: hidden;
  }
  body:after {
    content: url("http://i21.tinypic.com/xkxge0.jpg");
    opacity: 0.5;
  }
}