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

@-moz-document url("http://ss-o.net/") {
body{
color:red;
}
}
@-moz-document domain("ss-o.net") {
body{
background:green;
}

}
@-moz-document domain('ss-o.net'), url-prefix('http://ss-o.net/extension') {
body{
font-weight:bold;
}
}