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diff --git a/browser/components/sessionstore/test/browser_500328.js b/browser/components/sessionstore/test/browser_500328.js
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+++ b/browser/components/sessionstore/test/browser_500328.js
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+/* 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/. */
+
+let checkState = Task.async(function*(browser) {
+  // Go back and then forward, and make sure that the state objects received
+  // from the popState event are as we expect them to be.
+  //
+  // We also add a node to the document's body when after going back and make
+  // sure it's still there after we go forward -- this is to test that the two
+  // history entries correspond to the same document.
+
+  let deferred = {};
+  deferred.promise = new Promise(resolve => deferred.resolve = resolve);
+
+  let popStateCount = 0;
+
+  browser.addEventListener("popstate", function(aEvent) {
+    if (popStateCount == 0) {
+      popStateCount++;
+
+      ok(aEvent.state, "Event should have a state property.");
+
+      ContentTask.spawn(browser, null, function() {
+        is(content.testState, "foo",
+           "testState after going back");
+        is(JSON.stringify(content.history.state), JSON.stringify({obj1:1}),
+           "first popstate object.");
+
+        // Add a node with id "new-elem" to the document.
+        let doc = content.document;
+        ok(!doc.getElementById("new-elem"),
+           "doc shouldn't contain new-elem before we add it.");
+        let elem = doc.createElement("div");
+        elem.id = "new-elem";
+        doc.body.appendChild(elem);
+      }).then(() => {
+        browser.goForward();
+      });
+    } else if (popStateCount == 1) {
+      popStateCount++;
+      // When content fires a PopStateEvent and we observe it from a chrome event
+      // listener (as we do here, and, thankfully, nowhere else in the tree), the
+      // state object will be a cross-compartment wrapper to an object that was
+      // deserialized in the content scope. And in this case, since RegExps are
+      // not currently Xrayable (see bug 1014991), trying to pull |obj3| (a RegExp)
+      // off of an Xrayed Object won't work. So we need to waive.
+      ContentTask.spawn(browser, aEvent.state, function(state) {
+        Assert.equal(Cu.waiveXrays(state).obj3.toString(),
+          "/^a$/", "second popstate object.");
+
+        // Make sure that the new-elem node is present in the document.  If it's
+        // not, then this history entry has a different doc identifier than the
+        // previous entry, which is bad.
+        let doc = content.document;
+        let newElem = doc.getElementById("new-elem");
+        ok(newElem, "doc should contain new-elem.");
+        newElem.parentNode.removeChild(newElem);
+        ok(!doc.getElementById("new-elem"), "new-elem should be removed.");
+      }).then(() => {
+        browser.removeEventListener("popstate", arguments.callee, true);
+        deferred.resolve();
+      });
+    }
+  });
+
+  // Set some state in the page's window.  When we go back(), the page should
+  // be retrieved from bfcache, and this state should still be there.
+  yield ContentTask.spawn(browser, null, function() {
+    content.testState = "foo";
+  });
+
+  // Now go back.  This should trigger the popstate event handler above.
+  browser.goBack();
+
+  yield deferred.promise;
+});
+
+add_task(function* test() {
+  // Tests session restore functionality of history.pushState and
+  // history.replaceState().  (Bug 500328)
+
+  // We open a new blank window, let it load, and then load in
+  // http://example.com.  We need to load the blank window first, otherwise the
+  // docshell gets confused and doesn't have a current history entry.
+  let state;
+  yield BrowserTestUtils.withNewTab({ gBrowser, url: "about:blank" }, function* (browser) {
+    BrowserTestUtils.loadURI(browser, "http://example.com");
+    yield BrowserTestUtils.browserLoaded(browser);
+
+    // After these push/replaceState calls, the window should have three
+    // history entries:
+    //   testURL        (state object: null)          <-- oldest
+    //   testURL        (state object: {obj1:1})
+    //   testURL?page2  (state object: {obj3:/^a$/})  <-- newest
+    function contentTest() {
+      let history = content.window.history;
+      history.pushState({obj1:1}, "title-obj1");
+      history.pushState({obj2:2}, "title-obj2", "?page2");
+      history.replaceState({obj3:/^a$/}, "title-obj3");
+    }
+    yield ContentTask.spawn(browser, null, contentTest);
+    yield TabStateFlusher.flush(browser);
+
+    state = ss.getTabState(gBrowser.getTabForBrowser(browser));
+  });
+
+  // Restore the state into a new tab.  Things don't work well when we
+  // restore into the old tab, but that's not a real use case anyway.
+  yield BrowserTestUtils.withNewTab({ gBrowser, url: "about:blank" }, function* (browser) {
+    let tab2 = gBrowser.getTabForBrowser(browser);
+
+    let tabRestoredPromise = promiseTabRestored(tab2);
+    ss.setTabState(tab2, state, true);
+
+    // Run checkState() once the tab finishes loading its restored state.
+    yield tabRestoredPromise;
+    yield checkState(browser);
+  });
+});