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

@-moz-document domain("demotywatory.pl") {

  div#adad,
  div#google_ads,
  div.demotivator,
  table.footer_links {
    display:none !important;
  }

  div.demotivator[id*="demot"] {
    display:block !important;
  }

  body {
    background-image: none !important;
  }
}