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

@-moz-document
  domain("yomiuri.co.jp"), 
  domain("yomiuri.co.jp.nyud.net")
{
  /* Remove Header Logo */
  #upcn { display:none !important; }
  div[class*="hPtn1"][class*="showUpbr"] { height:0px !important; }
}