@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("www.nicovideo.jp"){
div.ads_728,
div[id^="web_pc_"],
iframe[name="google_ads_frame"],
div#PAGEHEADER a[href*="?p=premium_top"]
{display:none!important;}}

@-moz-document url-prefix("http://www.nicovideo.jp/watch/"){
div#WATCHFOOTER > div:first-child + div > a[target="_blank"] > img[width="468"][height="60"]
{display:none!important;}}