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

@-moz-document domain("w3schools.com") {
   .content + td {
      width: auto !important;
   }
   .content + td + td ,
   .content + td iframe, .content + td iframe ~ *,
   iframe[height='90'], td[width='200'] {
      display: none !important;
   }
}