diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug610242.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug610242.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/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  newWindowWithTabView(onTabViewWindowLoaded);
+}
+
+function onTabViewWindowLoaded(win) {
+  win.removeEventListener("tabviewshown", onTabViewWindowLoaded, false);
+
+  ok(win.TabView.isVisible(), "Tab View is visible");
+
+  let contentWindow = win.document.getElementById("tab-view").contentWindow;
+  let [originalTab] = win.gBrowser.visibleTabs;
+
+  let currentGroup = contentWindow.GroupItems.getActiveGroupItem();
+
+  // Create a group and make it active
+  let box = new contentWindow.Rect(100, 100, 370, 370);
+  let group = new contentWindow.GroupItem([], { bounds: box });
+  ok(group.isEmpty(), "This group is empty");
+  contentWindow.UI.setActive(group);
+  is(contentWindow.GroupItems.getActiveGroupItem(), group, "new group is active");
+  
+  // Create a bunch of tabs in the group
+  let bg = {inBackground: true};
+  let datatext = win.gBrowser.loadOneTab("data:text/plain,bug610242", bg);
+  let datahtml = win.gBrowser.loadOneTab("data:text/html,<h1>hi!</h1>", bg);
+  let mozilla  = win.gBrowser.loadOneTab("about:mozilla", bg);
+  let synclog   = win.gBrowser.loadOneTab("about:sync-log", bg);
+  let html     = win.gBrowser.loadOneTab("http://example.com", bg);
+  let png      = win.gBrowser.loadOneTab("http://mochi.test:8888/browser/browser/base/content/test/general/moz.png", bg);
+  let svg      = win.gBrowser.loadOneTab("http://mochi.test:8888/browser/browser/base/content/test/general/title_test.svg", bg);
+  
+  ok(!group.shouldStack(group._children.length), "Group should not stack.");
+  
+  // PREPARE FINISH:
+  group.addSubscriber("close", function onClose() {
+    group.removeSubscriber("close", onClose);
+
+    ok(group.isEmpty(), "The group is empty again");
+
+    contentWindow.UI.setActive(currentGroup);
+    isnot(contentWindow.GroupItems.getActiveGroupItem(), null, "There is an active group");
+    is(win.gBrowser.tabs.length, 1, "There is only one tab left");
+    is(win.gBrowser.visibleTabs.length, 1, "There is also only one visible tab");
+
+    whenTabViewIsHidden(function() {
+      win.close();
+      ok(win.closed, "new window is closed");
+      finish();
+    }, win);
+    win.gBrowser.selectedTab = originalTab;
+
+    win.TabView.hide();
+  });
+
+  function check(tab, label, visible) {
+    let display = contentWindow.getComputedStyle(tab._tabViewTabItem.$fav[0], null).getPropertyValue("display");
+    if (visible) {
+      is(display, "block", label + " has favicon");
+    } else {
+      is(display, "none", label + " has no favicon");
+    }
+  }
+
+  afterAllTabsLoaded(function() {
+    let children = group.getChildren();
+    let len = children.length;
+    let iconUpdateCounter = 0;
+
+    children.forEach(function(tabItem) {
+      tabItem.addSubscriber("iconUpdated", function onIconUpdated() {
+        tabItem.removeSubscriber("iconUpdated", onIconUpdated);
+
+        if (++iconUpdateCounter == len) {
+          check(datatext, "datatext", false);
+          check(datahtml, "datahtml", false);
+          check(mozilla, "about:mozilla", false);
+          check(synclog, "about:sync-log", true);
+          check(html, "html", true);
+          check(png, "png", false);
+          check(svg, "svg", true);
+
+          // Get rid of the group and its children
+          // The group close will trigger a finish().
+          closeGroupItem(group);
+        }
+      });
+    });
+
+    afterAllTabItemsUpdated(function () {}, win);
+  }, win);
+}