diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug595804.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug595804.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,96 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+var prefsBranch = Cc["@mozilla.org/preferences-service;1"].
+                  getService(Ci.nsIPrefService).
+                  getBranch("browser.panorama.");
+
+function animateZoom() prefsBranch.getBoolPref("animate_zoom");
+
+let contentWindow = null;
+
+registerCleanupFunction(function() {
+  // reset to default: true
+  prefsBranch.setBoolPref("animate_zoom", true);
+});
+
+function test() {
+  requestLongerTimeout(2);
+  waitForExplicitFinish();
+  
+  ok(!TabView.isVisible(), "Tab View is not visible");
+  
+  window.addEventListener("tabviewshown", startTesting, false);
+  TabView.toggle();
+}
+
+function startTesting() {
+  window.removeEventListener("tabviewshown", startTesting, false);
+  
+  contentWindow = document.getElementById("tab-view").contentWindow;
+  
+  ok(TabView.isVisible(), "Tab View is visible");
+  
+  ok(animateZoom(), "By default, we want to animate");
+  
+  function finishOnHidden() {
+    contentWindow.removeEventListener("tabviewhidden", finishOnHidden, false);
+    ok(!TabView.isVisible(), "Tab View is not visible");
+    finish();
+  }
+  
+  function wrapup() {
+    contentWindow.addEventListener("tabviewhidden", finishOnHidden, false);
+    TabView.hide();
+  }
+
+  function part2() {
+    prefsBranch.setBoolPref("animate_zoom", false);
+    ok(!animateZoom(), "animate_zoom = false");
+    zoomInAndOut(false, wrapup);
+  }
+
+  function part1() {
+    prefsBranch.setBoolPref("animate_zoom",true);
+    ok(animateZoom(), "animate_zoom = true");
+    zoomInAndOut(true, part2);
+  }
+    
+  // start it up!
+  part1();
+}
+  
+function zoomInAndOut(transitionsExpected, callback) {
+  let transitioned = 0;
+
+  contentWindow.document.addEventListener("transitionend", onTransitionEnd, false);
+  function onTransitionEnd(event) {
+    transitioned++;
+  }
+
+  let onHidden = function() {
+    contentWindow.removeEventListener("tabviewhidden", onHidden, false);
+    if (transitionsExpected)
+      ok(transitioned >= 0, "There can be transitions");
+    else
+      ok(!transitioned, "There should have been no transitions");
+    TabView.toggle();
+  };
+  
+  let onShownAgain = function() {
+    contentWindow.removeEventListener("tabviewshown", onShownAgain, false);
+    if (transitionsExpected)
+      ok(transitioned >= 0, "There can be transitions");
+    else
+      ok(!transitioned, "There should have been no transitions");
+
+    contentWindow.document.removeEventListener("transitionend", onTransitionEnd, false);
+    callback();
+  };
+  
+  contentWindow.addEventListener("tabviewhidden", onHidden, false);
+  contentWindow.addEventListener("tabviewshown", onShownAgain, false);
+  
+  // get this party started by hiding tab view
+  TabView.toggle();
+}