diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/extensions/content/selectAddons.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/extensions/content/selectAddons.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#select .addon {
+  -moz-binding: url("chrome://mozapps/content/extensions/selectAddons.xml#addon-select");
+}
+
+#confirm .addon {
+  -moz-binding: url("chrome://mozapps/content/extensions/selectAddons.xml#addon-confirm");
+}
+
+#select-scrollbox,
+#confirm-scrollbox {
+  overflow-y: auto;
+  -moz-box-orient: vertical;
+}
+
+.addon:not([optionalupdate]) .addon-action-update,
+.addon[optionalupdate] .addon-action-message {
+  display: none;
+}