diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug626791.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug626791.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,178 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+Cu.import("resource:///modules/CustomizableUI.jsm");
+
+
+function test() {
+  let cw;
+  let win;
+  let prefix;
+
+  let getToolbar = function () {
+    return win.document.getElementById("TabsToolbar");
+  }
+
+  let assertToolbarButtonExists = function () {
+    isnot(getToolbar().currentSet.indexOf("tabview-button"), -1,
+          prefix + ": panorama button should be in the toolbar");
+  }
+
+  let assertToolbarButtonNotExists = function () {
+    is(getToolbar().currentSet.indexOf("tabview-button"), -1,
+       prefix + ": panorama button should not be in the toolbar");
+  }
+
+  let assertNumberOfTabs = function (num) {
+    is(win.gBrowser.tabs.length, num, prefix + ': there are ' + num + ' tabs');
+  }
+
+  let removeToolbarButton = function () {
+    let toolbar = getToolbar();
+    let currentSet = toolbar.currentSet.split(",");
+    let buttonId = "tabview-button";
+    let pos = currentSet.indexOf(buttonId);
+
+    if (-1 < pos) {
+      CustomizableUI.removeWidgetFromArea("tabview-button");
+    }
+  }
+
+  let testNameGroup = function () {
+    prefix = 'name-group';
+    assertToolbarButtonNotExists();
+    let groupItem = cw.GroupItems.groupItems[0];
+
+    groupItem.setTitle('title');
+    assertToolbarButtonNotExists();
+    groupItem.setTitle('');
+
+    EventUtils.synthesizeMouseAtCenter(groupItem.$titleShield[0], {}, cw);
+    EventUtils.synthesizeKey('t', {}, cw);
+    groupItem.$title[0].blur();
+
+    assertToolbarButtonExists();
+    next();
+  }
+
+  let testDragToCreateGroup = function () {
+    prefix = 'drag-to-create-group';
+    assertToolbarButtonNotExists();
+    let width = cw.innerWidth;
+    let height = cw.innerHeight;
+
+    let body = cw.document.body;
+    EventUtils.synthesizeMouse(body, width - 10, height - 10, {type: 'mousedown'}, cw);
+    EventUtils.synthesizeMouse(body, width - 200, height - 200, {type: 'mousemove'}, cw);
+    EventUtils.synthesizeMouse(body, width - 200, height - 200, {type: 'mouseup'}, cw);
+
+    assertToolbarButtonExists();
+    next();
+  }
+
+  let testCreateOrphan = function (tab) {
+    prefix = 'create-orphan';
+    assertNumberOfTabs(1);
+    assertToolbarButtonNotExists();
+
+    let width = cw.innerWidth;
+    let height = cw.innerHeight;
+
+    let body = cw.document.body;
+    EventUtils.synthesizeMouse(body, width - 10, height - 10, { clickCount: 2 }, cw);
+
+    whenTabViewIsHidden(function () {
+      assertNumberOfTabs(2);
+      assertToolbarButtonExists();
+
+      next();
+    }, win);
+  }
+
+  let testDragToCreateOrphan = function (tab) {
+    if (!tab) {
+      let tab = win.gBrowser.loadOneTab('about:blank', {inBackground: true});
+      afterAllTabsLoaded(function () testDragToCreateOrphan(tab), win);
+      return;
+    }
+
+    prefix = 'drag-to-create-orphan';
+    assertNumberOfTabs(2);
+    assertToolbarButtonNotExists();
+
+    let width = cw.innerWidth;
+    let height = cw.innerHeight;
+
+    let target = tab._tabViewTabItem.container;
+    let rect = target.getBoundingClientRect();
+    EventUtils.synthesizeMouseAtCenter(target, {type: 'mousedown'}, cw);
+    EventUtils.synthesizeMouse(target, rect.width - 10, rect.height - 10, {type: 'mousemove'}, cw);
+    EventUtils.synthesizeMouse(target, width - 300, height - 300, {type: 'mousemove'}, cw);
+    EventUtils.synthesizeMouse(target, width - 200, height - 200, {type: 'mousemove'}, cw);
+    EventUtils.synthesizeMouseAtCenter(target, {type: 'mouseup'}, cw);
+
+    assertToolbarButtonExists();
+    next();
+  }
+
+  let testReAddingAfterRemoval = function () {
+    prefix = 're-adding-after-removal';
+    assertToolbarButtonNotExists();
+
+    win.TabView.firstUseExperienced = true;
+    assertToolbarButtonExists();
+    removeToolbarButton();
+    assertToolbarButtonNotExists();
+
+    win.close();
+
+    newWindowWithTabView(function (newWin) {
+      win = newWin;
+      win.TabView.firstUseExperienced = true;
+      assertToolbarButtonNotExists();
+      next();
+    });
+  }
+
+  let tests = [testNameGroup, testDragToCreateGroup, testCreateOrphan,
+               testDragToCreateOrphan, testReAddingAfterRemoval];
+
+  let next = function () {
+    if (win)
+      win.close();
+
+    let test = tests.shift();
+
+    if (!test) {
+      finish();
+      return;
+    }
+
+    TabView.firstUseExperienced = false;
+
+    let onLoad = function (newWin) {
+      win = newWin;
+      removeToolbarButton();
+    };
+
+    let onShow = function () {
+      cw = win.TabView.getContentWindow();
+
+      let groupItem = cw.GroupItems.groupItems[0];
+      groupItem.setSize(200, 200, true);
+      groupItem.setUserSize();
+
+      SimpleTest.waitForFocus(function () {
+        assertToolbarButtonNotExists();
+        test();
+      }, cw);
+    };
+
+    newWindowWithTabView(onShow, onLoad);
+  }
+
+  waitForExplicitFinish();
+  requestLongerTimeout(2);
+
+  next();
+}