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

@-moz-document domain("nicovideo.jp") {

/* リンク(動画) */
a.video:link    { color:#09C !important; text-decoration:underline !important;}
a.video:visited { color:#069 !important; text-decoration:underline !important;}
a.video:hover, a.video:active { color:#FFF !important; text-decoration:none !important; background:#333 !important;}

}