@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("youtube.com") {

#baseDiv { width: 743px !important; }
#movie_player {width: 706px !important; height: 556px !important;}
#aboutExploreDiv, #dVidsDiv, #otherVidsCell {padding-top: 700px !important;}
#footContent, #leaderboardAd {display: none !important;}
}