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

@-moz-document domain("www.w3schools.com") {

body > a:first-child + table,
body > table > tbody > tr > td + td + td,
body table table tr + tr,
hr + div,
iframe
  { display: none !important; }

body > table + table
{ 
   width: 100% !important;
   max-width: none !important;
   margin: 0 !important;
   padding: 0 !important;
   float: none !important;
}

}