diff -r 000000000000 -r 6474c204b198 addon-sdk/source/examples/annotator/data/widget/widget.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/examples/annotator/data/widget/widget.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+/* 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/. */
+
+/*
+Listen for left and right click events and send the corresponding message
+to the content script.
+*/
+
+this.addEventListener('click', function(event) {
+  if(event.button == 0 && event.shiftKey == false)
+    self.port.emit('left-click');
+
+  if(event.button == 2 || (event.button == 0 && event.shiftKey == true))
+    self.port.emit('right-click');
+    event.preventDefault();
+}, true);