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

@-moz-document domain("youtube.com") {
* {background-color: #001011 !important;}
a, li > a.title, li > a > span.title {color: #2255ee  !important;} 
h1, h2, h3, h4, h5, h6 {color: #cccccc  !important;} 
#watch-player {border: 1px #cccccc solid !important;}
strong {color: #eeeeee !important;}
#watch-headline, #watch-video {width:98% !important;}
p, button {color: #dddddd !important;}
input {color: #ffffff !important;}
}