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

@-moz-document domain("gametrailers.com")
{
  .header_promo,
  .share_buttons,
  .utils_content_rating,
  .comments-teaser,
  .utils_share_widget,
  .adv,
  .add,
  .flux_comments
  {
     display:none !important;
  }
}