customize toolbar fixing

toolkit/content/customizeToolbar.xul

@@ -36,6 +36,8 @@
 <window id="CustomizeToolbarWindow"
         title="&dialog.title;"
         onload="onLoad();"
+        onunload="onUnload();"
+        onclose="onAccept(); return false;"
         xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
 
 <script type="application/x-javascript" src="chrome://global/content/customizeToolbar.js"/>