diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_firstrun_pref.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_firstrun_pref.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,82 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+let prefsBranch = Cc["@mozilla.org/preferences-service;1"].
+                  getService(Ci.nsIPrefService).
+                  getBranch("browser.panorama.");
+let originalPrefState;
+
+function test() {
+  waitForExplicitFinish();
+
+  ok(!TabView.isVisible(), "Main window TabView is hidden");
+
+  originalPrefState = experienced();
+
+  prefsBranch.setBoolPref("experienced_first_run", false);
+  ok(!experienced(), "set to not experienced");
+
+  newWindowWithTabView(checkFirstRun, function() {
+    // open tabview doesn't count as first use experience so setting it manually
+    prefsBranch.setBoolPref("experienced_first_run", true);
+    ok(experienced(), "we're now experienced");
+
+    newWindowWithTabView(checkNotFirstRun, endGame);
+  });
+}
+
+function experienced() {
+  return prefsBranch.prefHasUserValue("experienced_first_run") &&
+    prefsBranch.getBoolPref("experienced_first_run");
+}
+
+function checkFirstRun(win) {
+  let contentWindow = win.document.getElementById("tab-view").contentWindow;
+  
+  // Welcome tab disabled by bug 626754. To be fixed via bug 626926.
+  is(win.gBrowser.tabs.length, 1, "There should be one tab");
+  
+  let groupItems = contentWindow.GroupItems.groupItems;
+  is(groupItems.length, 1, "There should be one group");
+  is(groupItems[0].getChildren().length, 1, "...with one child");
+
+  ok(!experienced(), "we're not experienced");
+}
+
+function checkNotFirstRun(win) {
+  let contentWindow = win.document.getElementById("tab-view").contentWindow;
+  
+  is(win.gBrowser.tabs.length, 1, "There should be one tab");
+  
+  let groupItems = contentWindow.GroupItems.groupItems;
+  is(groupItems.length, 1, "There should be one group");
+  is(groupItems[0].getChildren().length, 1, "...with one child");
+}
+
+function endGame() {
+  ok(!TabView.isVisible(), "Main window TabView is still hidden");
+  ok(experienced(), "should finish as experienced");
+
+  prefsBranch.setBoolPref("experienced_first_run", originalPrefState);
+
+  finish();
+}
+
+function newWindowWithTabView(callback, completeCallback) {
+  let charsetArg = "charset=" + window.content.document.characterSet;
+  let win = window.openDialog(getBrowserURL(), "_blank", "chrome,all,dialog=no,height=800,width=800",
+                              "about:blank", charsetArg, null, null, true);
+  let onLoad = function() {
+    win.removeEventListener("load", onLoad, false);
+    let onShown = function() {
+      win.removeEventListener("tabviewshown", onShown, false);
+      callback(win);
+      win.close();
+      if (typeof completeCallback == "function")
+        completeCallback();
+    };
+    win.addEventListener("tabviewshown", onShown, false);
+    win.TabView.toggle();
+  }
+  win.addEventListener("load", onLoad, false);
+}