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

@-moz-document url-prefix("https://www.google.com/reader/view/"), url-prefix("http://www.google.com/reader/view/") {
 div#quick-add-bubble-holder + div#main > div#nav > div#lhn-add-subscription-section {
  display: none !important;
 }
}