Add options and a browser-action popup.

go-back-with-backspace/background.js

Index: go-back-with-backspace/background.js
diff --git a/go-back-with-backspace/background.js b/go-back-with-backspace/background.js
index dada8c845c4a852ba5f52e03c4c0f7daafdd01cb..0c822a5e3343b6905ee986942eeb4db54e21c2d3 100644
--- a/go-back-with-backspace/background.js
+++ b/go-back-with-backspace/background.js
@@ -1,6 +1,10 @@
+// Copyright 2016 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 // Put up an informative message on first install.
 chrome.runtime.onInstalled.addListener(function(details) {
   if (details.reason == "install") {
-    chrome.tabs.create({url: "installed.html"});
+    chrome.tabs.create({url: "pages/installed.html"});
   }
 });