tumblr followers a.avatar:visited opacity low
ひとまず妥協案
@namespace url(http://www.w3.org/1999/xhtml); @-moz-document url("http://www.tumblr.com/followers") { a.avatar:visited { opacity: 0.10 !important; } a.avatar:visited + div { opacity: 0.10 !important; } }