diff -r 000000000000 -r 6474c204b198 browser/components/sessionstore/test/browser_global_store.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/sessionstore/test/browser_global_store.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests the API for saving global session data.
+function runTests() {
+  const key1 = "Unique name 1: " + Date.now();
+  const key2 = "Unique name 2: " + Date.now();
+  const value1 = "Unique value 1: " + Math.random();
+  const value2 = "Unique value 2: " + Math.random();
+
+  let global = {};
+  global[key1] = value1;
+
+  const testState = {
+    windows: [
+      {
+        tabs: [
+          { entries: [{ url: "about:blank" }] },
+        ]
+      }
+    ],
+    global: global
+  };
+
+  function testRestoredState() {
+    is(ss.getGlobalValue(key1), value1, "restored state has global value");
+  }
+
+  function testGlobalStore() {
+    is(ss.getGlobalValue(key2), "", "global value initially not set");
+
+    ss.setGlobalValue(key2, value1);
+    is(ss.getGlobalValue(key2), value1, "retreived value matches stored");
+
+    ss.setGlobalValue(key2, value2);
+    is(ss.getGlobalValue(key2), value2, "previously stored value was overwritten");
+
+    ss.deleteGlobalValue(key2);
+    is(ss.getGlobalValue(key2), "", "global value was deleted");
+  }
+
+  yield waitForBrowserState(testState, next);
+  testRestoredState();
+  testGlobalStore();
+}
+
+function test() {
+  TestRunner.run();
+}