diff -r 000000000000 -r 6474c204b198 browser/devtools/app-manager/builtin-adb-store.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/app-manager/builtin-adb-store.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+/* 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/. */
+
+const {Cu} = require("chrome");
+const ObservableObject = require("devtools/shared/observable-object");
+const {Devices} = Cu.import("resource://gre/modules/devtools/Devices.jsm");
+
+let store = new ObservableObject({versions:[]});
+
+function feedStore() {
+  store.object.available = Devices.helperAddonInstalled;
+  store.object.devices = Devices.available().map(n => {
+    return {name:n}
+  });
+}
+
+Devices.on("register", feedStore);
+Devices.on("unregister", feedStore);
+Devices.on("addon-status-updated", feedStore);
+
+feedStore();
+
+module.exports = store;