diff -r 000000000000 -r 6474c204b198 browser/components/sessionstore/test/browser_480893.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/sessionstore/test/browser_480893.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* 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/. */
+
+function test() {
+  /** Test for Bug 480893 **/
+
+  waitForExplicitFinish();
+
+  // Test that starting a new session loads a blank page if Firefox is
+  // configured to display a blank page at startup (browser.startup.page = 0)
+  gPrefService.setIntPref("browser.startup.page", 0);
+  let tab = gBrowser.addTab("about:sessionrestore");
+  gBrowser.selectedTab = tab;
+  let browser = tab.linkedBrowser;
+  whenBrowserLoaded(browser, function() {
+    let doc = browser.contentDocument;
+
+    // click on the "Start New Session" button after about:sessionrestore is loaded
+    doc.getElementById("errorCancel").click();
+    whenBrowserLoaded(browser, function() {
+      let doc = browser.contentDocument;
+
+      is(doc.URL, "about:blank", "loaded page is about:blank");
+
+      // Test that starting a new session loads the homepage (set to http://mochi.test:8888)
+      // if Firefox is configured to display a homepage at startup (browser.startup.page = 1)
+      let homepage = "http://mochi.test:8888/";
+      gPrefService.setCharPref("browser.startup.homepage", homepage);
+      gPrefService.setIntPref("browser.startup.page", 1);
+      gBrowser.loadURI("about:sessionrestore");
+      whenBrowserLoaded(browser, function() {
+        let doc = browser.contentDocument;
+
+        // click on the "Start New Session" button after about:sessionrestore is loaded
+        doc.getElementById("errorCancel").click();
+        whenBrowserLoaded(browser, function() {
+          let doc = browser.contentDocument;
+
+          is(doc.URL, homepage, "loaded page is the homepage");
+
+          // close tab, restore default values and finish the test
+          gBrowser.removeTab(tab);
+          gPrefService.clearUserPref("browser.startup.page");
+          gPrefService.clearUserPref("browser.startup.homepage");
+          finish();
+        });
+      });
+    });
+  });
+}