diff -r 000000000000 -r 6474c204b198 b2g/simulator/lib/main.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/b2g/simulator/lib/main.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,52 @@
+/* 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 { Cc, Ci, Cu } = require("chrome");
+
+const { SimulatorProcess } = require("./simulator-process");
+const { Promise: promise } = Cu.import("resource://gre/modules/Promise.jsm", {});
+const Self = require("sdk/self");
+const System = require("sdk/system");
+const { Simulator } = Cu.import("resource://gre/modules/devtools/Simulator.jsm");
+
+let process;
+
+function launch({ port }) {
+  // Close already opened simulation
+  if (process) {
+    return close().then(launch.bind(null, { port: port }));
+  }
+
+  process = SimulatorProcess();
+  process.remoteDebuggerPort = port;
+  process.run();
+
+  return promise.resolve();
+}
+
+function close() {
+  if (!process) {
+    return promise.resolve();
+  }
+  let p = process;
+  process = null;
+  return p.kill();
+}
+
+
+// Load data generated at build time that
+// expose various information about the runtime we ship
+let appinfo = System.staticArgs;
+
+Simulator.register(appinfo.label, {
+  appinfo: appinfo,
+  launch: launch,
+  close: close
+});
+
+require("sdk/system/unload").when(function () {
+  Simulator.unregister(appinfo.label);
+  close();
+});