diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_bug1003461-switchtab-override.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_bug1003461-switchtab-override.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,63 @@
+/* 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/. */
+
+add_task(function* test_switchtab_override() {
+  let testURL = "http://example.org/browser/browser/base/content/test/general/dummy_page.html";
+
+  info("Opening first tab");
+  let tab = gBrowser.addTab(testURL);
+  let deferred = Promise.defer();
+  whenTabLoaded(tab, deferred.resolve);
+  yield deferred.promise;
+
+  info("Opening and selecting second tab");
+  let secondTab = gBrowser.selectedTab = gBrowser.addTab();
+  registerCleanupFunction(() => {
+    try {
+      gBrowser.removeTab(tab);
+      gBrowser.removeTab(secondTab);
+    } catch(ex) { /* tabs may have already been closed in case of failure */ }
+  });
+
+  info("Wait for autocomplete")
+  deferred = Promise.defer();
+  let onSearchComplete = gURLBar.onSearchComplete;
+  registerCleanupFunction(() => {
+    gURLBar.onSearchComplete = onSearchComplete;
+  });
+  gURLBar.onSearchComplete = function () {
+    ok(gURLBar.popupOpen, "The autocomplete popup is correctly open");
+    onSearchComplete.apply(gURLBar);
+    deferred.resolve();
+  }
+  
+  gURLBar.focus();
+  gURLBar.value = "dummy_pag";
+  EventUtils.synthesizeKey("e" , {});
+  yield deferred.promise;
+
+  info("Select first autocomplete popup entry");
+  EventUtils.synthesizeKey("VK_DOWN" , {});
+  ok(/moz-action:switchtab/.test(gURLBar.value), "switch to tab entry found");
+
+  info("Override switch-to-tab");
+  let deferred = Promise.defer();
+  // In case of failure this would switch tab.
+  let onTabSelect = event => {
+    deferred.reject(new Error("Should have overridden switch to tab"));
+  };
+  gBrowser.tabContainer.addEventListener("TabSelect", onTabSelect, false);
+  registerCleanupFunction(() => {
+    gBrowser.tabContainer.removeEventListener("TabSelect", onTabSelect, false);
+  });
+  // Otherwise it would load the page.
+  whenTabLoaded(secondTab, deferred.resolve);
+
+  EventUtils.synthesizeKey("VK_SHIFT" , { type: "keydown" });
+  EventUtils.synthesizeKey("VK_RETURN" , { });
+  EventUtils.synthesizeKey("VK_SHIFT" , { type: "keyup" });
+  yield deferred.promise;
+
+  yield promiseClearHistory();
+});