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diff --git a/addon-sdk/source/examples/theme/lib/main.js b/addon-sdk/source/examples/theme/lib/main.js
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+++ b/addon-sdk/source/examples/theme/lib/main.js
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+/* 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/. */
+"use strict";
+
+const { Tool } = require("dev/toolbox");
+const { Class } = require("sdk/core/heritage");
+const { onEnable, onDisable } = require("dev/theme/hooks");
+const { Theme, LightTheme } = require("dev/theme");
+
+/**
+ * This object represents a new theme registered within the Toolbox.
+ * You can activate it by clicking on "My Light Theme" theme option
+ * in the Options panel.
+ * Note that the new theme derives styles from built-in Light theme.
+ */
+const MyTheme = Theme({
+  name: "mytheme",
+  label: "My Light Theme",
+  styles: [LightTheme, "./theme.css"],
+
+  onEnable: function(window, oldTheme) {
+    console.log("myTheme.onEnable; method override " +
+      window.location.href);
+  },
+  onDisable: function(window, newTheme) {
+    console.log("myTheme.onDisable; method override " +
+      window.location.href);
+  },
+});
+
+// Registration
+
+const mytheme = new Tool({
+  name: "My Tool",
+  themes: { mytheme: MyTheme }
+});