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

@-moz-document domain("www.heise.de") {
  
  div#bannerzone, div#sitemap, div#mitte_rechts, div.bcadv
  {
    display: none !important;
  }

  div#container_content
  {
    top: 10px !important;
  }

  div#mitte_links
  {
    width: 100% !important;
  }

  div#mitte
  {
    background: none !important;
  }

}