diff -r 000000000000 -r 6474c204b198 toolkit/devtools/gcli/commands/restart.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/gcli/commands/restart.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,60 @@
+/* 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 { Cc, Ci, Cu } = require("chrome");
+const gcli = require("gcli/index");
+const Services = require("Services");
+
+const BRAND_SHORT_NAME = Cc["@mozilla.org/intl/stringbundle;1"]
+                           .getService(Ci.nsIStringBundleService)
+                           .createBundle("chrome://branding/locale/brand.properties")
+                           .GetStringFromName("brandShortName");
+
+/**
+ * Restart command
+ *
+ * @param boolean nocache
+ *        Disables loading content from cache upon restart.
+ *
+ * Examples :
+ * >> restart
+ * - restarts browser immediately
+ * >> restart --nocache
+ * - restarts immediately and starts Firefox without using cache
+ */
+exports.items = [
+  {
+    name: "restart",
+    description: gcli.lookupFormat("restartBrowserDesc", [ BRAND_SHORT_NAME ]),
+    params: [
+      {
+        name: "nocache",
+        type: "boolean",
+        description: gcli.lookup("restartBrowserNocacheDesc")
+      }
+    ],
+    returnType: "string",
+    exec: function Restart(args, context) {
+      let canceled = Cc["@mozilla.org/supports-PRBool;1"]
+                      .createInstance(Ci.nsISupportsPRBool);
+      Services.obs.notifyObservers(canceled, "quit-application-requested", "restart");
+      if (canceled.data) {
+        return gcli.lookup("restartBrowserRequestCancelled");
+      }
+
+      // disable loading content from cache.
+      if (args.nocache) {
+        Services.appinfo.invalidateCachesOnRestart();
+      }
+
+      // restart
+      Cc["@mozilla.org/toolkit/app-startup;1"]
+          .getService(Ci.nsIAppStartup)
+          .quit(Ci.nsIAppStartup.eAttemptQuit | Ci.nsIAppStartup.eRestart);
+      return gcli.lookupFormat("restartBrowserRestarting", [ BRAND_SHORT_NAME ]);
+    }
+  }
+];