diff -r 000000000000 -r 6474c204b198 browser/modules/test/browser_UITour_detach_tab.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/modules/test/browser_UITour_detach_tab.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,83 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Detaching a tab to a new window shouldn't break the menu panel.
+ */
+
+"use strict";
+
+let gTestTab;
+let gContentAPI;
+let gContentWindow;
+let gContentDoc;
+let highlight = document.getElementById("UITourHighlight");
+let tooltip = document.getElementById("UITourTooltip");
+
+Components.utils.import("resource:///modules/UITour.jsm");
+
+function test() {
+  registerCleanupFunction(function() {
+    gContentDoc = null;
+  });
+  UITourTest();
+}
+
+let tests = [
+  function test_move_tab_to_new_window(done) {
+    let gOpenedWindow;
+    let onVisibilityChange = (aEvent) => {
+      if (!document.hidden && window != UITour.getChromeWindow(aEvent.target)) {
+        gContentAPI.showHighlight("appMenu");
+      }
+    };
+    let onDOMWindowDestroyed = (aWindow, aTopic, aData) => {
+      if (gOpenedWindow && aWindow == gOpenedWindow) {
+        Services.obs.removeObserver(onDOMWindowDestroyed, "dom-window-destroyed", false);
+        done();
+      }
+    };
+    let onBrowserDelayedStartup = (aWindow, aTopic, aData) => {
+      gOpenedWindow = aWindow;
+      Services.obs.removeObserver(onBrowserDelayedStartup, "browser-delayed-startup-finished");
+      try {
+        let newWindowHighlight = gOpenedWindow.document.getElementById("UITourHighlight");
+        let selectedTab = aWindow.gBrowser.selectedTab;
+        is(selectedTab.linkedBrowser && selectedTab.linkedBrowser.contentDocument, gContentDoc, "Document should be selected in new window");
+        ok(UITour.originTabs && UITour.originTabs.has(aWindow), "Window should be known");
+        ok(UITour.originTabs.get(aWindow).has(selectedTab), "Tab should be known");
+        waitForElementToBeVisible(newWindowHighlight, function checkHighlightIsThere() {
+          let shownPromise = promisePanelShown(aWindow);
+          gContentAPI.showMenu("appMenu");
+          shownPromise.then(() => {
+            isnot(aWindow.PanelUI.panel.state, "closed", "Panel should be open");
+            ok(aWindow.PanelUI.contents.children.length > 0, "Panel contents should have children");
+            gContentAPI.hideHighlight();
+            gContentAPI.hideMenu("appMenu");
+            gTestTab = null;
+            aWindow.close();
+          }).then(null, Components.utils.reportError);
+        }, "Highlight should be shown in new window.");
+      } catch (ex) {
+        Cu.reportError(ex);
+        ok(false, "An error occurred running UITour tab detach test.");
+      } finally {
+        gContentDoc.removeEventListener("visibilitychange", onVisibilityChange, false);
+        Services.obs.addObserver(onDOMWindowDestroyed, "dom-window-destroyed", false);
+      }
+    };
+
+    Services.obs.addObserver(onBrowserDelayedStartup, "browser-delayed-startup-finished", false);
+    // NB: we're using this rather than gContentWindow.document because the latter wouldn't
+    // have an XRayWrapper, and we need to compare this to the doc we get using this method
+    // later on...
+    gContentDoc = gBrowser.selectedTab.linkedBrowser.contentDocument;
+    gContentDoc.addEventListener("visibilitychange", onVisibilityChange, false);
+    gContentAPI.showHighlight("appMenu");
+    waitForElementToBeVisible(highlight, function checkForInitialHighlight() {
+      gBrowser.replaceTabWithWindow(gBrowser.selectedTab);
+    });
+
+  },
+];
+