@-moz-document 
/*Change .com to any (.jp, .ca...)*/
url-prefix(http://www.google.com/reader),
url-prefix(https://www.google.com/reader),
url-prefix(http://www.google.com.br/reader),
url-prefix(https://www.google.com.br/reader) {

/* read items entries */

.read .collapsed { background: #E6E6E6 !important; }

/* hover entries */

.entry:hover .collapsed { background: #EFE7D1 !important;  /* was FFFFBF */ }

}