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

@-moz-document domain("lifehacking.jp") {
  #AMN-large-banner
 ,#header_img
 ,.amn_large_banner
 ,.sidebar_list>li:first-child
 ,#sidebar
 ,ins
 ,.tagged
 ,#dsq-new-post
 ,#footer
  {display:none !important;}

 #content{width:auto !important;}
}