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

@-moz-document 
domain("maps.yahoo.com"),
domain("new.groups.yahoo.com"),
domain("news.yahoo.com"), 
domain("www.yahoo.com"), 
domain("my.yahoo.com")  {
#ymap_adbanner, #ymaps_adc, .ygrp-lrec, .lrec, #lrec, #LREC, #ad, #ad-lrec {display:none !important}
}