diff -r 000000000000 -r 6474c204b198 xpcom/sample/nsSample.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/sample/nsSample.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,60 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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");
+
+/**
+ * We set up a sample component. The constructor is empty, all the interesting
+ * stuff goes in the prototype.
+ */
+function mySample() { }
+
+mySample.prototype = {
+    /**
+     * .classID is required for generateNSGetFactory to work correctly.
+     * Make sure this CID matches the "component" in your .manifest file.
+     */
+    classID: Components.ID("{dea98e50-1dd1-11b2-9344-8902b4805a2e}"),
+
+    /**
+     * .classDescription and .contractID are only used for
+     * backwards compatibility with Gecko 1.9.2 and
+     * XPCOMUtils.generateNSGetModule.
+     */
+    classDescription: "nsSample: JS version", // any human-readable string
+    contractID: "@mozilla.org/jssample;1",
+
+    /**
+     * List all the interfaces your component supports.
+     * @note nsISupports is generated automatically; you don't need to list it.
+     */
+    QueryInterface: XPCOMUtils.generateQI([Components.interfaces.nsISample]),
+
+    /*
+     * get and set are new Magic in JS1.5, borrowing the intent -- if not
+     * the exact syntax -- from the JS2 design.  They define accessors for
+     * properties on the JS object, follow the expected rules for prototype
+     * delegation, and make a mean cup of coffee.
+     */
+    get value()       { return this.val; },
+    set value(newval) { return this.val = newval; },
+
+    writeValue: function (aPrefix) {
+        debug("mySample::writeValue => " + aPrefix + this.val + "\n");
+    },
+    poke: function (aValue) { this.val = aValue; },
+
+    val: "<default value>"
+};
+
+/**
+ * XPCOMUtils.generateNSGetFactory was introduced in Mozilla 2 (Firefox 4).
+ * XPCOMUtils.generateNSGetModule is for Mozilla 1.9.2 (Firefox 3.6).
+ */
+if (XPCOMUtils.generateNSGetFactory)
+    this.NSGetFactory = XPCOMUtils.generateNSGetFactory([mySample]);
+else
+    var NSGetModule = XPCOMUtils.generateNSGetModule([mySample]);