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

@-moz-document domain("facebook.com") {

  .fbnew_preview_bar {
    display:none !important;
  }

   div#newsfeed_wrapper div.tab_top_stories div.ad_capsule, div#newsfeed_wrapper div.tab_top_stories div.social_ad, .sponser, #sidebar_ads {
      display:none !important;
   }

   .right_column_container {
      margin:inherit !important;
   }


}