diff -r 000000000000 -r 6474c204b198 browser/components/sessionstore/test/browser_665702-state_session.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/sessionstore/test/browser_665702-state_session.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function compareArray(a, b) {
+  if (a.length !== b.length) {
+    return false;
+  }
+  for (let i = 0; i < a.length; i++) {
+    if (a[i] !== b[i]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+function test() {
+  let currentState = JSON.parse(ss.getBrowserState());
+  ok(currentState.session, "session data returned by getBrowserState");
+
+  let keys = Object.keys(currentState.session);
+  let expectedKeys = ["lastUpdate", "startTime", "recentCrashes"];
+  ok(compareArray(keys.sort(), expectedKeys.sort()),
+     "session object from getBrowserState has correct keys");
+}