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

@-moz-document url-prefix("http://www.nicovideo.jp/watch/") {
  #PAGEHEADER {
    margin-top: -460px !important;
    padding-top: 550px !important; /*NicoAntiScroll併用対策*/
  }
  #flvplayer_container {
    position: absolute;
    top: 0;
    margin-top: -460px !important;
    overflow: hidden;
  }
  .ads_728,
  #WATCHFOOTER,
  #PAGEFOOTER {
    display: none;
  }
}