diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug626455.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug626455.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,100 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ *
+ * Contributor(s):
+ *   Mihai Sucan <mihai.sucan@gmail.com>
+ *   Raymond Lee <raymond@appcoast.com>
+ */
+
+"use strict";
+
+const TEST_URL = 'data:text/html,<script>window.onbeforeunload=' +
+                 'function(e){e.returnValue="?"}</script>';
+
+let contentWindow;
+let activeGroup;
+
+function test() {
+  waitForExplicitFinish();
+
+  newWindowWithTabView(win => {
+    contentWindow = win.TabView.getContentWindow();
+    activeGroup = contentWindow.GroupItems.getActiveGroupItem();
+
+    win.gBrowser.browsers[0].loadURI("data:text/html,<p>test for bug 626455, tab1");
+
+    let tab = win.gBrowser.addTab(TEST_URL);
+    afterAllTabsLoaded(() => testStayOnPage(win, tab));
+  });
+}
+
+function testStayOnPage(win, blockingTab) {
+  let browser = blockingTab.linkedBrowser;
+  waitForOnBeforeUnloadDialog(browser, function (btnLeave, btnStay) {
+    // stay on page
+    btnStay.click();
+
+    executeSoon(function () {
+      showTabView(function () {
+        is(win.gBrowser.tabs.length, 1,
+           "The total number of tab is 1 when staying on the page");
+
+        // The other initial tab has been closed when trying to close the tab
+        // group. The only tab left is the one with the onbeforeunload dialog.
+        let url = win.gBrowser.browsers[0].currentURI.spec;
+        ok(url.contains("onbeforeunload"), "The open tab is the expected one");
+
+        is(contentWindow.GroupItems.getActiveGroupItem(), activeGroup,
+           "Active group is still the same");
+
+        is(contentWindow.GroupItems.groupItems.length, 1,
+           "Only one group is open");
+
+        // start the next test
+        testLeavePage(win, win.gBrowser.tabs[0]);
+      }, win);
+    });
+  });
+
+  closeGroupItem(activeGroup);
+}
+
+function testLeavePage(win, blockingTab) {
+  let browser = blockingTab.linkedBrowser;
+  waitForOnBeforeUnloadDialog(browser, function (btnLeave, btnStay) {
+    // Leave page
+    btnLeave.click();
+  });
+
+  whenGroupClosed(activeGroup, () => finishTest(win));
+  closeGroupItem(activeGroup);
+}
+
+function finishTest(win) {
+  is(win.gBrowser.tabs.length, 1,
+     "The total number of tab is 1 after leaving the page");
+  is(contentWindow.TabItems.getItems().length, 1,
+     "The total number of tab items is 1 after leaving the page");
+
+  let location = win.gBrowser.browsers[0].currentURI.spec;
+  is(location, BROWSER_NEW_TAB_URL, "The open tab is the expected one");
+
+  isnot(contentWindow.GroupItems.getActiveGroupItem(), activeGroup,
+     "Active group is no longer the same");
+
+  is(contentWindow.GroupItems.groupItems.length, 1,
+     "Only one group is open");
+
+  contentWindow = null;
+  activeGroup = null;
+  promiseWindowClosed(win).then(finish);
+}
+
+// ----------
+function whenGroupClosed(group, callback) {
+  group.addSubscriber("close", function onClose() {
+    group.removeSubscriber("close", onClose);
+    callback();
+  });
+}