diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_bug477014.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_bug477014.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* 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/. */
+
+// That's a gecko!
+const iconURLSpec = "data:image/png;base64,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";
+var testPage="data:text/plain,test bug 477014";
+
+function test() {
+  waitForExplicitFinish();
+
+  var newWindow;
+  var tabToDetach;
+  var documentToDetach;
+
+  function onPageShow(event) {
+    // we get here if the test is executed before the pageshow
+    // event for the window's first tab
+    if (!tabToDetach || documentToDetach != event.target)
+      return;
+
+    event.currentTarget.removeEventListener("pageshow", onPageShow, false);
+
+    if (!newWindow) {
+      // prepare the tab (set icon and busy state)
+      // we have to set these only after onState* notification, otherwise
+      // they're overriden
+      setTimeout(function() {
+        gBrowser.setIcon(tabToDetach, iconURLSpec);
+        tabToDetach.setAttribute("busy", "true");
+
+        // detach and set the listener on the new window
+        newWindow = gBrowser.replaceTabWithWindow(tabToDetach);
+        // wait for gBrowser to come along
+        newWindow.addEventListener("load", function () {
+          newWindow.removeEventListener("load", arguments.callee, false);
+          newWindow.gBrowser.addEventListener("pageshow", onPageShow, false);
+        }, false);
+      }, 0);
+      return;
+    }
+
+    is(newWindow.gBrowser.selectedTab.hasAttribute("busy"), true);
+    is(newWindow.gBrowser.getIcon(), iconURLSpec);
+    newWindow.close();
+    finish();
+  }
+
+  tabToDetach = gBrowser.addTab(testPage);
+  tabToDetach.linkedBrowser.addEventListener("load", function onLoad() {
+    tabToDetach.linkedBrowser.removeEventListener("load", onLoad, true);
+    documentToDetach = tabToDetach.linkedBrowser.contentDocument;
+    gBrowser.addEventListener("pageshow", onPageShow, false);
+  }, true);
+}