diff -r 000000000000 -r 6474c204b198 xulrunner/examples/simple/components/src/SimpleTest.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xulrunner/examples/simple/components/src/SimpleTest.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+/* vim:set ts=2 sw=2 sts=2 et cin: */
+/* 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/. */
+
+Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
+
+function SimpleTest() {
+}
+
+SimpleTest.prototype = {
+  classID: Components.ID("{4177e257-a0dc-49b9-a774-522a000a49fa}"),
+
+  QueryInterface: function(iid) {
+    if (iid.equals(Components.interfaces.nsISimpleTest) ||
+        iid.equals(Components.interfaces.nsISupports))
+      return this;
+    throw Components.results.NS_ERROR_NO_INTERFACE;
+  },
+
+  add: function(a, b) {
+    dump("add(" + a + "," + b + ") from JS\n");
+    return a + b;
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([SimpleTest]);