Bug 1003542 - remove extra space at bottom of single-item menus in bookmarks menu button panel menus, r=mikedeboer

browser/themes/shared/customizableui/panelUIOverlay.inc.css

@@ -787,7 +787,7 @@ menuitem.panel-subview-footer@menuStateActive@,
 }
 
 /* Popups with only one item don't have a footer */
-menupopup[placespopup=true][singleitempopup=true] > hbox > .popup-internal-box > .arrowscrollbox-scrollbox > .scrollbox-innerbox,
+#BMB_bookmarksPopup menupopup[placespopup=true][singleitempopup=true] > hbox > .popup-internal-box > .arrowscrollbox-scrollbox > .scrollbox-innerbox,
 /* These popups never have a footer */
 #BMB_bookmarksToolbarPopup > hbox > .popup-internal-box > .arrowscrollbox-scrollbox > .scrollbox-innerbox,
 #BMB_unsortedBookmarksPopup > hbox > .popup-internal-box > .arrowscrollbox-scrollbox > .scrollbox-innerbox {