Bug 428349: In Addon Manager, the (x) that closes the "No updates were found" message is shifted a bit to the left inside its small box, patch by Jan Darmochwal <jdarmochwal@gmx.de>, r=me, a=damon

toolkit/themes/gnomestripe/global/notification.css

@@ -32,3 +32,7 @@ notification[type="critical"] {
 .messageCloseButton {
   list-style-image: url("moz-icon://stock/gtk-close?size=menu");
 }
+
+.messageCloseButton > .toolbarbutton-icon {
+  margin: 0px !important;
+}