Add m-esr52 at 52.6.0

25 files changed, 6945 insertions, 0 deletions

diff --git a/accessible/xul/XULAlertAccessible.cpp b/accessible/xul/XULAlertAccessible.cpp
new file mode 100644
index 000000000..4b1b5bd8d
--- /dev/null
+++ b/accessible/xul/XULAlertAccessible.cpp
@@ -0,0 +1,68 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "XULAlertAccessible.h"
+
+#include "Accessible-inl.h"
+#include "Role.h"
+#include "States.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULAlertAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULAlertAccessible::
+  XULAlertAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+  mGenericTypes |= eAlert;
+}
+
+XULAlertAccessible::~XULAlertAccessible()
+{
+}
+
+NS_IMPL_ISUPPORTS_INHERITED0(XULAlertAccessible, Accessible)
+
+role
+XULAlertAccessible::NativeRole()
+{
+  return roles::ALERT;
+}
+
+uint64_t
+XULAlertAccessible::NativeState()
+{
+  return Accessible::NativeState() | states::ALERT;
+}
+
+ENameValueFlag
+XULAlertAccessible::Name(nsString& aName)
+{
+  // Screen readers need to read contents of alert, not the accessible name.
+  // If we have both some screen readers will read the alert twice.
+  aName.Truncate();
+  return eNameOK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Widgets
+
+bool
+XULAlertAccessible::IsWidget() const
+{
+  return true;
+}
+
+Accessible*
+XULAlertAccessible::ContainerWidget() const
+{
+  // If a part of colorpicker widget.
+  if (mParent && mParent->IsMenuButton())
+    return mParent;
+  return nullptr;
+}
diff --git a/accessible/xul/XULAlertAccessible.h b/accessible/xul/XULAlertAccessible.h
new file mode 100644
index 000000000..62bf4cb46
--- /dev/null
+++ b/accessible/xul/XULAlertAccessible.h
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_XULAlertAccessible_h__
+#define mozilla_a11y_XULAlertAccessible_h__
+
+#include "AccessibleWrap.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * Accessible for supporting XUL alerts.
+ */
+
+class XULAlertAccessible : public AccessibleWrap
+{
+public:
+  XULAlertAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  // Accessible
+  virtual mozilla::a11y::ENameValueFlag Name(nsString& aName) override;
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual Accessible* ContainerWidget() const override;
+
+protected:
+  ~XULAlertAccessible();
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULColorPickerAccessible.cpp b/accessible/xul/XULColorPickerAccessible.cpp
new file mode 100644
index 000000000..1bc507e9a
--- /dev/null
+++ b/accessible/xul/XULColorPickerAccessible.cpp
@@ -0,0 +1,143 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "XULColorPickerAccessible.h"
+
+#include "Accessible-inl.h"
+#include "nsAccUtils.h"
+#include "nsCoreUtils.h"
+#include "DocAccessible.h"
+#include "Role.h"
+#include "States.h"
+
+#include "nsIDOMElement.h"
+#include "nsMenuPopupFrame.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULColorPickerTileAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULColorPickerTileAccessible::
+  XULColorPickerTileAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULColorPickerTileAccessible: Accessible
+
+void
+XULColorPickerTileAccessible::Value(nsString& aValue)
+{
+  aValue.Truncate();
+
+  mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::color, aValue);
+}
+
+role
+XULColorPickerTileAccessible::NativeRole()
+{
+  return roles::PUSHBUTTON;
+}
+
+uint64_t
+XULColorPickerTileAccessible::NativeState()
+{
+  uint64_t state = AccessibleWrap::NativeState();
+  if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::selected))
+    state |= states::SELECTED;
+
+  return state;
+}
+
+uint64_t
+XULColorPickerTileAccessible::NativeInteractiveState() const
+{
+  return NativelyUnavailable() ?
+    states::UNAVAILABLE : states::FOCUSABLE | states::SELECTABLE;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULColorPickerTileAccessible: Widgets
+
+Accessible*
+XULColorPickerTileAccessible::ContainerWidget() const
+{
+  Accessible* parent = Parent();
+  if (parent) {
+    Accessible* grandParent = parent->Parent();
+    if (grandParent && grandParent->IsMenuButton())
+      return grandParent;
+  }
+  return nullptr;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULColorPickerAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULColorPickerAccessible::
+  XULColorPickerAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  XULColorPickerTileAccessible(aContent, aDoc)
+{
+  mGenericTypes |= eMenuButton;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULColorPickerAccessible: Accessible
+
+uint64_t
+XULColorPickerAccessible::NativeState()
+{
+  uint64_t state = AccessibleWrap::NativeState();
+  return state | states::HASPOPUP;
+}
+
+role
+XULColorPickerAccessible::NativeRole()
+{
+  return roles::BUTTONDROPDOWNGRID;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULColorPickerAccessible: Widgets
+
+bool
+XULColorPickerAccessible::IsWidget() const
+{
+  return true;
+}
+
+bool
+XULColorPickerAccessible::IsActiveWidget() const
+{
+  return FocusMgr()->HasDOMFocus(mContent);
+}
+
+bool
+XULColorPickerAccessible::AreItemsOperable() const
+{
+  Accessible* menuPopup = mChildren.SafeElementAt(0, nullptr);
+  if (menuPopup) {
+    nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(menuPopup->GetFrame());
+    return menuPopupFrame && menuPopupFrame->IsOpen();
+  }
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULColorPickerAccessible: Accessible
+
+bool
+XULColorPickerAccessible::IsAcceptableChild(nsIContent* aEl) const
+{
+  nsAutoString role;
+  nsCoreUtils::XBLBindingRole(aEl, role);
+  return role.EqualsLiteral("xul:panel") &&
+    aEl->AttrValueIs(kNameSpaceID_None, nsGkAtoms::noautofocus,
+                     nsGkAtoms::_true, eCaseMatters);
+}
diff --git a/accessible/xul/XULColorPickerAccessible.h b/accessible/xul/XULColorPickerAccessible.h
new file mode 100644
index 000000000..fba4111ca
--- /dev/null
+++ b/accessible/xul/XULColorPickerAccessible.h
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_XULColorPickerAccessible_h__
+#define mozilla_a11y_XULColorPickerAccessible_h__
+
+#include "AccessibleWrap.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * Used for color button in colorpicker palette.
+ */
+class XULColorPickerTileAccessible : public AccessibleWrap
+{
+public:
+  XULColorPickerTileAccessible(nsIContent* aContent,
+                               DocAccessible* aDoc);
+
+  // Accessible
+  virtual void Value(nsString& aValue) override;
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+  virtual uint64_t NativeInteractiveState() const override;
+
+  // Widgets
+  virtual Accessible* ContainerWidget() const override;
+};
+
+
+/**
+ * Used for colorpicker button (xul:colorpicker@type="button").
+ */
+class XULColorPickerAccessible : public XULColorPickerTileAccessible
+{
+public:
+  XULColorPickerAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+
+  virtual bool IsAcceptableChild(nsIContent* aEl) const override;
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif  
diff --git a/accessible/xul/XULComboboxAccessible.cpp b/accessible/xul/XULComboboxAccessible.cpp
new file mode 100644
index 000000000..1bca6d58e
--- /dev/null
+++ b/accessible/xul/XULComboboxAccessible.cpp
@@ -0,0 +1,194 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "XULComboboxAccessible.h"
+
+#include "Accessible-inl.h"
+#include "nsAccessibilityService.h"
+#include "DocAccessible.h"
+#include "nsCoreUtils.h"
+#include "Role.h"
+#include "States.h"
+
+#include "nsIAutoCompleteInput.h"
+#include "nsIDOMXULMenuListElement.h"
+#include "nsIDOMXULSelectCntrlItemEl.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULComboboxAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULComboboxAccessible::
+  XULComboboxAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+  if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
+                            nsGkAtoms::autocomplete, eIgnoreCase))
+    mGenericTypes |= eAutoComplete;
+  else
+    mGenericTypes |= eCombobox;
+
+  // Both the XUL <textbox type="autocomplete"> and <menulist editable="true">
+  // widgets use XULComboboxAccessible. We need to walk the anonymous children
+  // for these so that the entry field is a child. Otherwise no XBL children.
+  if (!mContent->NodeInfo()->Equals(nsGkAtoms::textbox, kNameSpaceID_XUL) &&
+      !mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::editable,
+                             nsGkAtoms::_true, eIgnoreCase)) {
+    mStateFlags |= eNoXBLKids;
+  }
+}
+
+role
+XULComboboxAccessible::NativeRole()
+{
+  return IsAutoComplete() ? roles::AUTOCOMPLETE : roles::COMBOBOX;
+}
+
+uint64_t
+XULComboboxAccessible::NativeState()
+{
+  // As a nsComboboxAccessible we can have the following states:
+  //     STATE_FOCUSED
+  //     STATE_FOCUSABLE
+  //     STATE_HASPOPUP
+  //     STATE_EXPANDED
+  //     STATE_COLLAPSED
+
+  // Get focus status from base class
+  uint64_t state = Accessible::NativeState();
+
+  nsCOMPtr<nsIDOMXULMenuListElement> menuList(do_QueryInterface(mContent));
+  if (menuList) {
+    bool isOpen = false;
+    menuList->GetOpen(&isOpen);
+    if (isOpen)
+      state |= states::EXPANDED;
+    else
+      state |= states::COLLAPSED;
+  }
+
+  return state | states::HASPOPUP;
+}
+
+void
+XULComboboxAccessible::Description(nsString& aDescription)
+{
+  aDescription.Truncate();
+  // Use description of currently focused option
+  nsCOMPtr<nsIDOMXULMenuListElement> menuListElm(do_QueryInterface(mContent));
+  if (!menuListElm)
+    return;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> focusedOptionItem;
+  menuListElm->GetSelectedItem(getter_AddRefs(focusedOptionItem));
+  nsCOMPtr<nsIContent> focusedOptionContent =
+    do_QueryInterface(focusedOptionItem);
+  if (focusedOptionContent && mDoc) {
+    Accessible* focusedOptionAcc = mDoc->GetAccessible(focusedOptionContent);
+    if (focusedOptionAcc)
+      focusedOptionAcc->Description(aDescription);
+  }
+}
+
+void
+XULComboboxAccessible::Value(nsString& aValue)
+{
+  aValue.Truncate();
+
+  // The value is the option or text shown entered in the combobox.
+  nsCOMPtr<nsIDOMXULMenuListElement> menuList(do_QueryInterface(mContent));
+  if (menuList)
+    menuList->GetLabel(aValue);
+}
+
+uint8_t
+XULComboboxAccessible::ActionCount()
+{
+  // Just one action (click).
+  return 1;
+}
+
+bool
+XULComboboxAccessible::DoAction(uint8_t aIndex)
+{
+  if (aIndex != XULComboboxAccessible::eAction_Click)
+    return false;
+
+  // Programmaticaly toggle the combo box.
+  nsCOMPtr<nsIDOMXULMenuListElement> menuList(do_QueryInterface(mContent));
+  if (!menuList)
+    return false;
+
+  bool isDroppedDown = false;
+  menuList->GetOpen(&isDroppedDown);
+  menuList->SetOpen(!isDroppedDown);
+  return true;
+}
+
+void
+XULComboboxAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  aName.Truncate();
+  if (aIndex != XULComboboxAccessible::eAction_Click)
+    return;
+
+  nsCOMPtr<nsIDOMXULMenuListElement> menuList(do_QueryInterface(mContent));
+  if (!menuList)
+    return;
+
+  bool isDroppedDown = false;
+  menuList->GetOpen(&isDroppedDown);
+  if (isDroppedDown)
+    aName.AssignLiteral("close");
+  else
+    aName.AssignLiteral("open");
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Widgets
+
+bool
+XULComboboxAccessible::IsActiveWidget() const
+{
+  if (IsAutoComplete() ||
+     mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::editable,
+                           nsGkAtoms::_true, eIgnoreCase)) {
+    int32_t childCount = mChildren.Length();
+    for (int32_t idx = 0; idx < childCount; idx++) {
+      Accessible* child = mChildren[idx];
+      if (child->Role() == roles::ENTRY)
+        return FocusMgr()->HasDOMFocus(child->GetContent());
+    }
+    return false;
+  }
+
+  return FocusMgr()->HasDOMFocus(mContent);
+}
+
+bool
+XULComboboxAccessible::AreItemsOperable() const
+{
+  if (IsAutoComplete()) {
+    nsCOMPtr<nsIAutoCompleteInput> autoCompleteInputElm =
+      do_QueryInterface(mContent);
+    if (autoCompleteInputElm) {
+      bool isOpen = false;
+      autoCompleteInputElm->GetPopupOpen(&isOpen);
+      return isOpen;
+    }
+    return false;
+  }
+
+  nsCOMPtr<nsIDOMXULMenuListElement> menuListElm = do_QueryInterface(mContent);
+  if (menuListElm) {
+    bool isOpen = false;
+    menuListElm->GetOpen(&isOpen);
+    return isOpen;
+  }
+
+  return false;
+}
diff --git a/accessible/xul/XULComboboxAccessible.h b/accessible/xul/XULComboboxAccessible.h
new file mode 100644
index 000000000..679f479b5
--- /dev/null
+++ b/accessible/xul/XULComboboxAccessible.h
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_XULComboboxAccessible_h__
+#define mozilla_a11y_XULComboboxAccessible_h__
+
+#include "XULMenuAccessible.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * Used for XUL comboboxes like xul:menulist and autocomplete textbox.
+ */
+class XULComboboxAccessible : public AccessibleWrap
+{
+public:
+  enum { eAction_Click = 0 };
+
+  XULComboboxAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual void Description(nsString& aDescription) override;
+  virtual void Value(nsString& aValue) override;
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+
+  // Widgets
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULElementAccessibles.cpp b/accessible/xul/XULElementAccessibles.cpp
new file mode 100644
index 000000000..b50ddb4ed
--- /dev/null
+++ b/accessible/xul/XULElementAccessibles.cpp
@@ -0,0 +1,288 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "XULElementAccessibles.h"
+
+#include "Accessible-inl.h"
+#include "BaseAccessibles.h"
+#include "DocAccessible-inl.h"
+#include "nsAccUtils.h"
+#include "nsCoreUtils.h"
+#include "nsTextEquivUtils.h"
+#include "Relation.h"
+#include "Role.h"
+#include "States.h"
+#include "TextUpdater.h"
+
+#ifdef A11Y_LOG
+#include "Logging.h"
+#endif
+
+#include "nsIDOMXULDescriptionElement.h"
+#include "nsNameSpaceManager.h"
+#include "nsNetUtil.h"
+#include "nsString.h"
+#include "nsTextBoxFrame.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULLabelAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULLabelAccessible::
+  XULLabelAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  HyperTextAccessibleWrap(aContent, aDoc)
+{
+  mType = eXULLabelType;
+
+  // If @value attribute is given then it's rendered instead text content. In
+  // this case we need to create a text leaf accessible to make @value attribute
+  // accessible.
+  // XXX: text interface doesn't let you get the text by words.
+  nsTextBoxFrame* textBoxFrame = do_QueryFrame(mContent->GetPrimaryFrame());
+  if (textBoxFrame) {
+    mValueTextLeaf = new XULLabelTextLeafAccessible(mContent, mDoc);
+    mDoc->BindToDocument(mValueTextLeaf, nullptr);
+
+    nsAutoString text;
+    textBoxFrame->GetCroppedTitle(text);
+    mValueTextLeaf->SetText(text);
+    AppendChild(mValueTextLeaf);
+  }
+}
+
+void
+XULLabelAccessible::Shutdown()
+{
+  mValueTextLeaf = nullptr;
+  HyperTextAccessibleWrap::Shutdown();
+}
+
+ENameValueFlag
+XULLabelAccessible::NativeName(nsString& aName)
+{
+  // if the value attr doesn't exist, the screen reader must get the accessible text
+  // from the accessible text interface or from the children
+  if (mValueTextLeaf)
+    return mValueTextLeaf->Name(aName);
+
+  return Accessible::NativeName(aName);
+}
+
+role
+XULLabelAccessible::NativeRole()
+{
+  return roles::LABEL;
+}
+
+uint64_t
+XULLabelAccessible::NativeState()
+{
+  // Labels and description have read only state
+  // They are not focusable or selectable
+  return HyperTextAccessibleWrap::NativeState() | states::READONLY;
+}
+
+Relation
+XULLabelAccessible::RelationByType(RelationType aType)
+{
+  Relation rel = HyperTextAccessibleWrap::RelationByType(aType);
+  if (aType == RelationType::LABEL_FOR) {
+    // Caption is the label for groupbox
+    nsIContent* parent = mContent->GetFlattenedTreeParent();
+    if (parent && parent->IsXULElement(nsGkAtoms::caption)) {
+      Accessible* parent = Parent();
+      if (parent && parent->Role() == roles::GROUPING)
+        rel.AppendTarget(parent);
+    }
+  }
+
+  return rel;
+}
+
+void
+XULLabelAccessible::UpdateLabelValue(const nsString& aValue)
+{
+#ifdef A11Y_LOG
+  if (logging::IsEnabled(logging::eText)) {
+    logging::MsgBegin("TEXT", "text may be changed (xul:label @value update)");
+    logging::Node("container", mContent);
+    logging::MsgEntry("old text '%s'",
+                      NS_ConvertUTF16toUTF8(mValueTextLeaf->Text()).get());
+    logging::MsgEntry("new text: '%s'",
+                      NS_ConvertUTF16toUTF8(aValue).get());
+    logging::MsgEnd();
+  }
+#endif
+
+  TextUpdater::Run(mDoc, mValueTextLeaf, aValue);
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULLabelTextLeafAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+role
+XULLabelTextLeafAccessible::NativeRole()
+{
+  return roles::TEXT_LEAF;
+}
+
+uint64_t
+XULLabelTextLeafAccessible::NativeState()
+{
+  return TextLeafAccessibleWrap::NativeState() | states::READONLY;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTooltipAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTooltipAccessible::
+  XULTooltipAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  LeafAccessible(aContent, aDoc)
+{
+}
+
+uint64_t
+XULTooltipAccessible::NativeState()
+{
+  return LeafAccessible::NativeState() | states::READONLY;
+}
+
+role
+XULTooltipAccessible::NativeRole()
+{
+  return roles::TOOLTIP;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULLinkAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULLinkAccessible::
+  XULLinkAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  XULLabelAccessible(aContent, aDoc)
+{
+}
+
+XULLinkAccessible::~XULLinkAccessible()
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULLinkAccessible: Accessible
+
+void
+XULLinkAccessible::Value(nsString& aValue)
+{
+  aValue.Truncate();
+
+  mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::href, aValue);
+}
+
+ENameValueFlag
+XULLinkAccessible::NativeName(nsString& aName)
+{
+  mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::value, aName);
+  if (!aName.IsEmpty())
+    return eNameOK;
+
+  nsTextEquivUtils::GetNameFromSubtree(this, aName);
+  return aName.IsEmpty() ? eNameOK : eNameFromSubtree;
+}
+
+role
+XULLinkAccessible::NativeRole()
+{
+  return roles::LINK;
+}
+
+
+uint64_t
+XULLinkAccessible::NativeLinkState() const
+{
+  return states::LINKED;
+}
+
+uint8_t
+XULLinkAccessible::ActionCount()
+{
+  return 1;
+}
+
+void
+XULLinkAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  aName.Truncate();
+
+  if (aIndex == eAction_Jump)
+    aName.AssignLiteral("jump");
+}
+
+bool
+XULLinkAccessible::DoAction(uint8_t aIndex)
+{
+  if (aIndex != eAction_Jump)
+    return false;
+
+  DoCommand();
+  return true;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULLinkAccessible: HyperLinkAccessible
+
+bool
+XULLinkAccessible::IsLink()
+{
+  // Expose HyperLinkAccessible unconditionally.
+  return true;
+}
+
+uint32_t
+XULLinkAccessible::StartOffset()
+{
+  // If XUL link accessible is not contained by hypertext accessible then
+  // start offset matches index in parent because the parent doesn't contains
+  // a text.
+  // XXX: accessible parent of XUL link accessible should be a hypertext
+  // accessible.
+  if (Accessible::IsLink())
+    return Accessible::StartOffset();
+  return IndexInParent();
+}
+
+uint32_t
+XULLinkAccessible::EndOffset()
+{
+  if (Accessible::IsLink())
+    return Accessible::EndOffset();
+  return IndexInParent() + 1;
+}
+
+already_AddRefed<nsIURI>
+XULLinkAccessible::AnchorURIAt(uint32_t aAnchorIndex)
+{
+  if (aAnchorIndex != 0)
+    return nullptr;
+
+  nsAutoString href;
+  mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::href, href);
+
+  nsCOMPtr<nsIURI> baseURI = mContent->GetBaseURI();
+  nsIDocument* document = mContent->OwnerDoc();
+
+  nsCOMPtr<nsIURI> anchorURI;
+  NS_NewURI(getter_AddRefs(anchorURI), href,
+            document->GetDocumentCharacterSet().get(),
+            baseURI);
+
+  return anchorURI.forget();
+}
diff --git a/accessible/xul/XULElementAccessibles.h b/accessible/xul/XULElementAccessibles.h
new file mode 100644
index 000000000..57a5ea03b
--- /dev/null
+++ b/accessible/xul/XULElementAccessibles.h
@@ -0,0 +1,116 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_XULElementAccessibles_h__
+#define mozilla_a11y_XULElementAccessibles_h__
+
+#include "HyperTextAccessibleWrap.h"
+#include "TextLeafAccessibleWrap.h"
+
+namespace mozilla {
+namespace a11y {
+
+class XULLabelTextLeafAccessible;
+
+/**
+ * Used for XUL description and label elements.
+ */
+class XULLabelAccessible : public HyperTextAccessibleWrap
+{
+public:
+  XULLabelAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual void Shutdown() override;
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+  virtual Relation RelationByType(RelationType aType) override;
+
+  void UpdateLabelValue(const nsString& aValue);
+
+protected:
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) override;
+
+private:
+  RefPtr<XULLabelTextLeafAccessible> mValueTextLeaf;
+};
+
+inline XULLabelAccessible*
+Accessible::AsXULLabel()
+{
+  return IsXULLabel() ? static_cast<XULLabelAccessible*>(this) : nullptr;
+}
+
+
+/**
+ * Used to implement text interface on XUL label accessible in case when text
+ * is provided by @value attribute (no underlying text frame).
+ */
+class XULLabelTextLeafAccessible final : public TextLeafAccessibleWrap
+{
+public:
+  XULLabelTextLeafAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+    TextLeafAccessibleWrap(aContent, aDoc)
+  { mStateFlags |= eSharedNode; }
+
+  virtual ~XULLabelTextLeafAccessible() { }
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+};
+
+
+/**
+ * Used for XUL tooltip element.
+ */
+class XULTooltipAccessible : public LeafAccessible
+{
+
+public:
+  XULTooltipAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+};
+
+class XULLinkAccessible : public XULLabelAccessible
+{
+
+public:
+  XULLinkAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual void Value(nsString& aValue) override;
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeLinkState() const override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+
+  // HyperLinkAccessible
+  virtual bool IsLink() override;
+  virtual uint32_t StartOffset() override;
+  virtual uint32_t EndOffset() override;
+  virtual already_AddRefed<nsIURI> AnchorURIAt(uint32_t aAnchorIndex) override;
+
+protected:
+  virtual ~XULLinkAccessible();
+
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) override;
+
+  enum { eAction_Jump = 0 };
+
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULFormControlAccessible.cpp b/accessible/xul/XULFormControlAccessible.cpp
new file mode 100644
index 000000000..95947f37c
--- /dev/null
+++ b/accessible/xul/XULFormControlAccessible.cpp
@@ -0,0 +1,633 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "XULFormControlAccessible.h"
+
+#include "Accessible-inl.h"
+#include "HTMLFormControlAccessible.h"
+#include "nsAccUtils.h"
+#include "nsCoreUtils.h"
+#include "DocAccessible.h"
+#include "nsIAccessibleRelation.h"
+#include "Relation.h"
+#include "Role.h"
+#include "States.h"
+#include "TreeWalker.h"
+#include "XULMenuAccessible.h"
+
+#include "nsIDOMNSEditableElement.h"
+#include "nsIDOMXULButtonElement.h"
+#include "nsIDOMXULCheckboxElement.h"
+#include "nsIDOMXULMenuListElement.h"
+#include "nsIDOMXULSelectCntrlItemEl.h"
+#include "nsIDOMXULTextboxElement.h"
+#include "nsIEditor.h"
+#include "nsIFrame.h"
+#include "nsITextControlFrame.h"
+#include "nsMenuPopupFrame.h"
+#include "nsNameSpaceManager.h"
+#include "mozilla/dom/Element.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULButtonAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULButtonAccessible::
+  XULButtonAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+  if (ContainsMenu()) {
+    mGenericTypes |= eMenuButton;
+  } else {
+    mGenericTypes |= eButton;
+  }
+}
+
+XULButtonAccessible::~XULButtonAccessible()
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULButtonAccessible: nsISupports
+
+NS_IMPL_ISUPPORTS_INHERITED0(XULButtonAccessible, Accessible)
+
+////////////////////////////////////////////////////////////////////////////////
+// XULButtonAccessible: nsIAccessible
+
+uint8_t
+XULButtonAccessible::ActionCount()
+{
+  return 1;
+}
+
+void
+XULButtonAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  if (aIndex == eAction_Click)
+    aName.AssignLiteral("press");
+}
+
+bool
+XULButtonAccessible::DoAction(uint8_t aIndex)
+{
+  if (aIndex != 0)
+    return false;
+
+  DoCommand();
+  return true;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULButtonAccessible: Accessible
+
+role
+XULButtonAccessible::NativeRole()
+{
+  return roles::PUSHBUTTON;
+}
+
+uint64_t
+XULButtonAccessible::NativeState()
+{
+  // Possible states: focused, focusable, unavailable(disabled).
+
+  // get focus and disable status from base class
+  uint64_t state = Accessible::NativeState();
+
+  // Buttons can be checked -- they simply appear pressed in rather than checked
+  nsCOMPtr<nsIDOMXULButtonElement> xulButtonElement(do_QueryInterface(mContent));
+  if (xulButtonElement) {
+    nsAutoString type;
+    xulButtonElement->GetType(type);
+    if (type.EqualsLiteral("checkbox") || type.EqualsLiteral("radio")) {
+      state |= states::CHECKABLE;
+      bool checked = false;
+      int32_t checkState = 0;
+      xulButtonElement->GetChecked(&checked);
+      if (checked) {
+        state |= states::PRESSED;
+        xulButtonElement->GetCheckState(&checkState);
+        if (checkState == nsIDOMXULButtonElement::CHECKSTATE_MIXED) { 
+          state |= states::MIXED;
+        }
+      }
+    }
+  }
+
+  if (ContainsMenu())
+    state |= states::HASPOPUP;
+
+  if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::_default))
+    state |= states::DEFAULT;
+
+  return state;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULButtonAccessible: Widgets
+
+bool
+XULButtonAccessible::IsWidget() const
+{
+  return true;
+}
+
+bool
+XULButtonAccessible::IsActiveWidget() const
+{
+  return FocusMgr()->HasDOMFocus(mContent);
+}
+
+bool
+XULButtonAccessible::AreItemsOperable() const
+{
+  if (IsMenuButton()) {
+    Accessible* menuPopup = mChildren.SafeElementAt(0, nullptr);
+    if (menuPopup) {
+      nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(menuPopup->GetFrame());
+      return menuPopupFrame->IsOpen();
+    }
+  }
+  return false; // no items
+}
+
+Accessible*
+XULButtonAccessible::ContainerWidget() const
+{
+  if (IsMenuButton() && mParent && mParent->IsAutoComplete())
+    return mParent;
+  return nullptr;
+}
+
+bool
+XULButtonAccessible::IsAcceptableChild(nsIContent* aEl) const
+{
+  // In general XUL button has not accessible children. Nevertheless menu
+  // buttons can have button (@type="menu-button") and popup accessibles
+  // (@type="menu-button", @type="menu" or columnpicker.
+
+  // XXX: no children until the button is menu button. Probably it's not
+  // totally correct but in general AT wants to have leaf buttons.
+  nsAutoString role;
+  nsCoreUtils::XBLBindingRole(aEl, role);
+
+  // Get an accessible for menupopup or panel elements.
+  if (role.EqualsLiteral("xul:menupopup")) {
+    return true;
+  }
+
+  // Button type="menu-button" contains a real button. Get an accessible
+  // for it. Ignore dropmarker button which is placed as a last child.
+  if ((!role.EqualsLiteral("xul:button") &&
+       !role.EqualsLiteral("xul:toolbarbutton")) ||
+      aEl->IsXULElement(nsGkAtoms::dropMarker)) {
+    return false;
+  }
+
+  return mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
+                               nsGkAtoms::menuButton, eCaseMatters);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULButtonAccessible protected
+
+bool
+XULButtonAccessible::ContainsMenu() const
+{
+  static nsIContent::AttrValuesArray strings[] =
+    {&nsGkAtoms::menu, &nsGkAtoms::menuButton, nullptr};
+
+  return mContent->FindAttrValueIn(kNameSpaceID_None,
+                                   nsGkAtoms::type,
+                                   strings, eCaseMatters) >= 0;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULDropmarkerAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULDropmarkerAccessible::
+  XULDropmarkerAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  LeafAccessible(aContent, aDoc)
+{
+}
+
+uint8_t
+XULDropmarkerAccessible::ActionCount()
+{
+  return 1;
+}
+
+bool
+XULDropmarkerAccessible::DropmarkerOpen(bool aToggleOpen) const
+{
+  bool isOpen = false;
+
+  nsIContent* parent = mContent->GetFlattenedTreeParent();
+
+  while (parent) {
+    nsCOMPtr<nsIDOMXULButtonElement> parentButtonElement =
+      do_QueryInterface(parent);
+    if (parentButtonElement) {
+      parentButtonElement->GetOpen(&isOpen);
+      if (aToggleOpen)
+        parentButtonElement->SetOpen(!isOpen);
+      return isOpen;
+    }
+
+    nsCOMPtr<nsIDOMXULMenuListElement> parentMenuListElement =
+      do_QueryInterface(parent);
+    if (parentMenuListElement) {
+      parentMenuListElement->GetOpen(&isOpen);
+      if (aToggleOpen)
+        parentMenuListElement->SetOpen(!isOpen);
+      return isOpen;
+    }
+    parent = parent->GetFlattenedTreeParent();
+  }
+
+  return isOpen;
+}
+
+void
+XULDropmarkerAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  aName.Truncate();
+  if (aIndex == eAction_Click) {
+    if (DropmarkerOpen(false))
+      aName.AssignLiteral("close");
+    else
+      aName.AssignLiteral("open");
+  }
+}
+
+bool
+XULDropmarkerAccessible::DoAction(uint8_t index)
+{
+  if (index == eAction_Click) {
+    DropmarkerOpen(true); // Reverse the open attribute
+    return true;
+  }
+  return false;
+}
+
+role
+XULDropmarkerAccessible::NativeRole()
+{
+  return roles::PUSHBUTTON;
+}
+
+uint64_t
+XULDropmarkerAccessible::NativeState()
+{
+  return DropmarkerOpen(false) ? states::PRESSED : 0;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULCheckboxAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULCheckboxAccessible::
+  XULCheckboxAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  LeafAccessible(aContent, aDoc)
+{
+}
+
+role
+XULCheckboxAccessible::NativeRole()
+{
+  return roles::CHECKBUTTON;
+}
+
+uint8_t
+XULCheckboxAccessible::ActionCount()
+{
+  return 1;
+}
+
+void
+XULCheckboxAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  if (aIndex == eAction_Click) {
+    if (NativeState() & states::CHECKED)
+      aName.AssignLiteral("uncheck");
+    else
+      aName.AssignLiteral("check");
+  }
+}
+
+bool
+XULCheckboxAccessible::DoAction(uint8_t aIndex)
+{
+  if (aIndex != eAction_Click)
+    return false;
+
+  DoCommand();
+  return true;
+}
+
+uint64_t
+XULCheckboxAccessible::NativeState()
+{
+  // Possible states: focused, focusable, unavailable(disabled), checked
+  // Get focus and disable status from base class
+  uint64_t state = LeafAccessible::NativeState();
+  
+  state |= states::CHECKABLE;
+  
+  // Determine Checked state
+  nsCOMPtr<nsIDOMXULCheckboxElement> xulCheckboxElement =
+    do_QueryInterface(mContent);
+  if (xulCheckboxElement) {
+    bool checked = false;
+    xulCheckboxElement->GetChecked(&checked);
+    if (checked) {
+      state |= states::CHECKED;
+      int32_t checkState = 0;
+      xulCheckboxElement->GetCheckState(&checkState);
+      if (checkState == nsIDOMXULCheckboxElement::CHECKSTATE_MIXED)
+        state |= states::MIXED;
+    }
+  }
+
+  return state;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULGroupboxAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULGroupboxAccessible::
+  XULGroupboxAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+}
+
+role
+XULGroupboxAccessible::NativeRole()
+{
+  return roles::GROUPING;
+}
+
+ENameValueFlag
+XULGroupboxAccessible::NativeName(nsString& aName)
+{
+  // XXX: we use the first related accessible only.
+  Accessible* label =
+    RelationByType(RelationType::LABELLED_BY).Next();
+  if (label)
+    return label->Name(aName);
+
+  return eNameOK;
+}
+
+Relation
+XULGroupboxAccessible::RelationByType(RelationType aType)
+{
+  Relation rel = AccessibleWrap::RelationByType(aType);
+  if (aType != RelationType::LABELLED_BY)
+    return rel;
+
+  // The label for xul:groupbox is generated from xul:label that is
+  // inside the anonymous content of the xul:caption.
+  // The xul:label has an accessible object but the xul:caption does not
+  uint32_t childCount = ChildCount();
+  for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
+    Accessible* childAcc = GetChildAt(childIdx);
+    if (childAcc->Role() == roles::LABEL) {
+      // Ensure that it's our label
+      Relation reverseRel = childAcc->RelationByType(RelationType::LABEL_FOR);
+      Accessible* testGroupbox = nullptr;
+      while ((testGroupbox = reverseRel.Next()))
+        if (testGroupbox == this) {
+          // The <label> points back to this groupbox
+          rel.AppendTarget(childAcc);
+        }
+    }
+  }
+
+  return rel;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULRadioButtonAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULRadioButtonAccessible::
+  XULRadioButtonAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  RadioButtonAccessible(aContent, aDoc)
+{
+}
+
+uint64_t
+XULRadioButtonAccessible::NativeState()
+{
+  uint64_t state = LeafAccessible::NativeState();
+  state |= states::CHECKABLE;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> radioButton =
+    do_QueryInterface(mContent);
+  if (radioButton) {
+    bool selected = false;   // Radio buttons can be selected
+    radioButton->GetSelected(&selected);
+    if (selected) {
+      state |= states::CHECKED;
+    }
+  }
+
+  return state;
+}
+
+uint64_t
+XULRadioButtonAccessible::NativeInteractiveState() const
+{
+  return NativelyUnavailable() ? states::UNAVAILABLE : states::FOCUSABLE;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULRadioButtonAccessible: Widgets
+
+Accessible*
+XULRadioButtonAccessible::ContainerWidget() const
+{
+  return mParent;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULRadioGroupAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+/**
+  * XUL Radio Group
+  *   The Radio Group proxies for the Radio Buttons themselves. The Group gets
+  *   focus whereas the Buttons do not. So we only have an accessible object for
+  *   this for the purpose of getting the proper RadioButton. Need this here to 
+  *   avoid circular reference problems when navigating the accessible tree and
+  *   for getting to the radiobuttons.
+  */
+
+XULRadioGroupAccessible::
+  XULRadioGroupAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  XULSelectControlAccessible(aContent, aDoc)
+{ 
+}
+
+role
+XULRadioGroupAccessible::NativeRole()
+{
+  return roles::RADIO_GROUP;
+}
+
+uint64_t
+XULRadioGroupAccessible::NativeInteractiveState() const
+{
+  // The radio group is not focusable. Sometimes the focus controller will
+  // report that it is focused. That means that the actual selected radio button
+  // should be considered focused.
+  return NativelyUnavailable() ? states::UNAVAILABLE : 0;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULRadioGroupAccessible: Widgets
+
+bool
+XULRadioGroupAccessible::IsWidget() const
+{
+  return true;
+}
+
+bool
+XULRadioGroupAccessible::IsActiveWidget() const
+{
+  return FocusMgr()->HasDOMFocus(mContent);
+}
+
+bool
+XULRadioGroupAccessible::AreItemsOperable() const
+{
+  return true;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULStatusBarAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULStatusBarAccessible::
+  XULStatusBarAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+}
+
+role
+XULStatusBarAccessible::NativeRole()
+{
+  return roles::STATUSBAR;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULToolbarButtonAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULToolbarButtonAccessible::
+  XULToolbarButtonAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  XULButtonAccessible(aContent, aDoc)
+{
+}
+
+void
+XULToolbarButtonAccessible::GetPositionAndSizeInternal(int32_t* aPosInSet,
+                                                       int32_t* aSetSize)
+{
+  int32_t setSize = 0;
+  int32_t posInSet = 0;
+
+  Accessible* parent = Parent();
+  if (!parent)
+    return;
+
+  uint32_t childCount = parent->ChildCount();
+  for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
+    Accessible* child = parent->GetChildAt(childIdx);
+    if (IsSeparator(child)) { // end of a group of buttons
+      if (posInSet)
+        break; // we've found our group, so we're done
+
+      setSize = 0; // not our group, so start a new group
+
+    } else {
+      setSize++; // another button in the group
+
+      if (child == this)
+        posInSet = setSize; // we've found our button
+    }
+  }
+
+  *aPosInSet = posInSet;
+  *aSetSize = setSize;
+}
+
+bool
+XULToolbarButtonAccessible::IsSeparator(Accessible* aAccessible)
+{
+  nsIContent* content = aAccessible->GetContent();
+  return content && content->IsAnyOfXULElements(nsGkAtoms::toolbarseparator,
+                                                nsGkAtoms::toolbarspacer,
+                                                nsGkAtoms::toolbarspring);
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULToolbarAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULToolbarAccessible::
+  XULToolbarAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+}
+
+role
+XULToolbarAccessible::NativeRole()
+{
+  return roles::TOOLBAR;
+}
+
+ENameValueFlag
+XULToolbarAccessible::NativeName(nsString& aName)
+{
+  if (mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::toolbarname, aName))
+    aName.CompressWhitespace();
+
+  return eNameOK;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULToolbarAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULToolbarSeparatorAccessible::
+  XULToolbarSeparatorAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  LeafAccessible(aContent, aDoc)
+{
+}
+
+role
+XULToolbarSeparatorAccessible::NativeRole()
+{
+  return roles::SEPARATOR;
+}
+
+uint64_t
+XULToolbarSeparatorAccessible::NativeState()
+{
+  return 0;
+}
diff --git a/accessible/xul/XULFormControlAccessible.h b/accessible/xul/XULFormControlAccessible.h
new file mode 100644
index 000000000..4f11668c9
--- /dev/null
+++ b/accessible/xul/XULFormControlAccessible.h
@@ -0,0 +1,218 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef MOZILLA_A11Y_XULFormControlAccessible_H_
+#define MOZILLA_A11Y_XULFormControlAccessible_H_
+
+// NOTE: alphabetically ordered
+#include "AccessibleWrap.h"
+#include "FormControlAccessible.h"
+#include "HyperTextAccessibleWrap.h"
+#include "XULSelectControlAccessible.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * Used for XUL progressmeter element.
+ */
+typedef ProgressMeterAccessible<100> XULProgressMeterAccessible;
+
+/**
+ * Used for XUL button.
+ *
+ * @note  Don't inherit from LeafAccessible - it doesn't allow children
+ *         and a button can have a dropmarker child.
+ */
+class XULButtonAccessible : public AccessibleWrap
+{
+public:
+  enum { eAction_Click = 0 };
+  XULButtonAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // nsISupports
+  NS_DECL_ISUPPORTS_INHERITED
+
+  // Accessible
+  virtual mozilla::a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+  virtual Accessible* ContainerWidget() const override;
+
+  virtual bool IsAcceptableChild(nsIContent* aEl) const override;
+
+protected:
+  virtual ~XULButtonAccessible();
+
+  // XULButtonAccessible
+  bool ContainsMenu() const;
+};
+
+
+/**
+ * Used for XUL checkbox element.
+ */
+class XULCheckboxAccessible : public LeafAccessible
+{
+public:
+  enum { eAction_Click = 0 };
+  XULCheckboxAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual mozilla::a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+};
+
+/**
+ * Used for XUL dropmarker element.
+ */
+class XULDropmarkerAccessible : public LeafAccessible
+{
+public:
+  enum { eAction_Click = 0 };
+  XULDropmarkerAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual mozilla::a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+
+private:
+  bool DropmarkerOpen(bool aToggleOpen) const;
+};
+
+/**
+ * Used for XUL groupbox element.
+ */
+class XULGroupboxAccessible final : public AccessibleWrap
+{
+public:
+  XULGroupboxAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual mozilla::a11y::role NativeRole() override;
+  virtual Relation RelationByType(RelationType aType) override;
+
+protected:
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) override;
+};
+
+/**
+ * Used for XUL radio element (radio button).
+ */
+class XULRadioButtonAccessible : public RadioButtonAccessible
+{
+
+public:
+  XULRadioButtonAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual uint64_t NativeState() override;
+  virtual uint64_t NativeInteractiveState() const override;
+
+  // Widgets
+  virtual Accessible* ContainerWidget() const override;
+};
+
+/**
+ * Used for XUL radiogroup element.
+ */
+class XULRadioGroupAccessible : public XULSelectControlAccessible
+{
+public:
+  XULRadioGroupAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual mozilla::a11y::role NativeRole() override;
+  virtual uint64_t NativeInteractiveState() const override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+};
+
+/**
+ * Used for XUL statusbar element.
+ */
+class XULStatusBarAccessible : public AccessibleWrap
+{
+public:
+  XULStatusBarAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual mozilla::a11y::role NativeRole() override;
+};
+
+/**
+ * Used for XUL toolbarbutton element.
+ */
+class XULToolbarButtonAccessible : public XULButtonAccessible
+{
+public:
+  XULToolbarButtonAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual void GetPositionAndSizeInternal(int32_t* aPosInSet,
+                                          int32_t* aSetSize) override;
+
+  // nsXULToolbarButtonAccessible
+  static bool IsSeparator(Accessible* aAccessible);
+};
+
+/**
+ * Used for XUL toolbar element.
+ */
+class XULToolbarAccessible : public AccessibleWrap
+{
+public:
+  XULToolbarAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual mozilla::a11y::role NativeRole() override;
+
+protected:
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) override;
+};
+
+/**
+ * Used for XUL toolbarseparator element.
+ */
+class XULToolbarSeparatorAccessible : public LeafAccessible
+{
+public:
+  XULToolbarSeparatorAccessible(nsIContent* aContent,
+                                DocAccessible* aDoc);
+
+  // Accessible
+  virtual mozilla::a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif
+
diff --git a/accessible/xul/XULListboxAccessible.cpp b/accessible/xul/XULListboxAccessible.cpp
new file mode 100644
index 000000000..52c3ddf0f
--- /dev/null
+++ b/accessible/xul/XULListboxAccessible.cpp
@@ -0,0 +1,828 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "XULListboxAccessible.h"
+
+#include "Accessible-inl.h"
+#include "nsAccessibilityService.h"
+#include "nsAccUtils.h"
+#include "DocAccessible.h"
+#include "Role.h"
+#include "States.h"
+
+#include "nsComponentManagerUtils.h"
+#include "nsIAutoCompleteInput.h"
+#include "nsIAutoCompletePopup.h"
+#include "nsIDOMXULMenuListElement.h"
+#include "nsIDOMXULMultSelectCntrlEl.h"
+#include "nsIDOMNodeList.h"
+#include "nsIDOMXULPopupElement.h"
+#include "nsIDOMXULSelectCntrlItemEl.h"
+#include "nsIMutableArray.h"
+#include "nsIPersistentProperties2.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULColumAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULColumAccessible::
+  XULColumAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+}
+
+role
+XULColumAccessible::NativeRole()
+{
+  return roles::LIST;
+}
+
+uint64_t
+XULColumAccessible::NativeState()
+{
+  return states::READONLY;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULColumnItemAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULColumnItemAccessible::
+  XULColumnItemAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  LeafAccessible(aContent, aDoc)
+{
+}
+
+role
+XULColumnItemAccessible::NativeRole()
+{
+  return roles::COLUMNHEADER;
+}
+
+uint64_t
+XULColumnItemAccessible::NativeState()
+{
+  return states::READONLY;
+}
+
+uint8_t
+XULColumnItemAccessible::ActionCount()
+{
+  return 1;
+}
+
+void
+XULColumnItemAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  if (aIndex == eAction_Click)
+    aName.AssignLiteral("click");
+}
+
+bool
+XULColumnItemAccessible::DoAction(uint8_t aIndex)
+{
+  if (aIndex != eAction_Click)
+    return false;
+
+  DoCommand();
+  return true;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListboxAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULListboxAccessible::
+  XULListboxAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  XULSelectControlAccessible(aContent, aDoc)
+{
+  nsIContent* parentContent = mContent->GetFlattenedTreeParent();
+  if (parentContent) {
+    nsCOMPtr<nsIAutoCompletePopup> autoCompletePopupElm =
+      do_QueryInterface(parentContent);
+    if (autoCompletePopupElm)
+      mGenericTypes |= eAutoCompletePopup;
+  }
+
+  if (IsMulticolumn())
+    mGenericTypes |= eTable;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListboxAccessible: Accessible
+
+uint64_t
+XULListboxAccessible::NativeState()
+{
+  // As a XULListboxAccessible we can have the following states:
+  //   FOCUSED, READONLY, FOCUSABLE
+
+  // Get focus status from base class
+  uint64_t states = Accessible::NativeState();
+
+  // see if we are multiple select if so set ourselves as such
+
+  if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::seltype,
+                            nsGkAtoms::multiple, eCaseMatters)) {
+      states |= states::MULTISELECTABLE | states::EXTSELECTABLE;
+  }
+
+  return states;
+}
+
+/**
+  * Our value is the label of our ( first ) selected child.
+  */
+void
+XULListboxAccessible::Value(nsString& aValue)
+{
+  aValue.Truncate();
+
+  nsCOMPtr<nsIDOMXULSelectControlElement> select(do_QueryInterface(mContent));
+  if (select) {
+    nsCOMPtr<nsIDOMXULSelectControlItemElement> selectedItem;
+    select->GetSelectedItem(getter_AddRefs(selectedItem));
+    if (selectedItem)
+      selectedItem->GetLabel(aValue);
+  }
+}
+
+role
+XULListboxAccessible::NativeRole()
+{
+  // A richlistbox is used with the new autocomplete URL bar, and has a parent
+  // popup <panel>.
+  nsCOMPtr<nsIDOMXULPopupElement> xulPopup =
+    do_QueryInterface(mContent->GetParent());
+  if (xulPopup)
+    return roles::COMBOBOX_LIST;
+
+  return IsMulticolumn() ? roles::TABLE : roles::LISTBOX;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListboxAccessible: Table
+
+uint32_t
+XULListboxAccessible::ColCount()
+{
+  nsIContent* headContent = nullptr;
+  for (nsIContent* childContent = mContent->GetFirstChild(); childContent;
+       childContent = childContent->GetNextSibling()) {
+    if (childContent->NodeInfo()->Equals(nsGkAtoms::listcols,
+                                         kNameSpaceID_XUL)) {
+      headContent = childContent;
+    }
+  }
+  if (!headContent)
+    return 0;
+
+  uint32_t columnCount = 0;
+  for (nsIContent* childContent = headContent->GetFirstChild(); childContent;
+       childContent = childContent->GetNextSibling()) {
+    if (childContent->NodeInfo()->Equals(nsGkAtoms::listcol,
+                                         kNameSpaceID_XUL)) {
+      columnCount++;
+    }
+  }
+
+  return columnCount;
+}
+
+uint32_t
+XULListboxAccessible::RowCount()
+{
+  nsCOMPtr<nsIDOMXULSelectControlElement> element(do_QueryInterface(mContent));
+
+  uint32_t itemCount = 0;
+  if(element)
+    element->GetItemCount(&itemCount);
+
+  return itemCount;
+}
+
+Accessible*
+XULListboxAccessible::CellAt(uint32_t aRowIndex, uint32_t aColumnIndex)
+{
+  nsCOMPtr<nsIDOMXULSelectControlElement> control =
+    do_QueryInterface(mContent);
+  NS_ENSURE_TRUE(control, nullptr);
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> item;
+  control->GetItemAtIndex(aRowIndex, getter_AddRefs(item));
+  if (!item)
+    return nullptr;
+
+  nsCOMPtr<nsIContent> itemContent(do_QueryInterface(item));
+  if (!itemContent)
+    return nullptr;
+
+  Accessible* row = mDoc->GetAccessible(itemContent);
+  NS_ENSURE_TRUE(row, nullptr);
+
+  return row->GetChildAt(aColumnIndex);
+}
+
+bool
+XULListboxAccessible::IsColSelected(uint32_t aColIdx)
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+    do_QueryInterface(mContent);
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  int32_t selectedrowCount = 0;
+  nsresult rv = control->GetSelectedCount(&selectedrowCount);
+  NS_ENSURE_SUCCESS(rv, false);
+
+  return selectedrowCount == static_cast<int32_t>(RowCount());
+}
+
+bool
+XULListboxAccessible::IsRowSelected(uint32_t aRowIdx)
+{
+  nsCOMPtr<nsIDOMXULSelectControlElement> control =
+    do_QueryInterface(mContent);
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULSelectControlElement.");
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> item;
+  nsresult rv = control->GetItemAtIndex(aRowIdx, getter_AddRefs(item));
+  NS_ENSURE_SUCCESS(rv, false);
+
+  bool isSelected = false;
+  item->GetSelected(&isSelected);
+  return isSelected;
+}
+
+bool
+XULListboxAccessible::IsCellSelected(uint32_t aRowIdx, uint32_t aColIdx)
+{
+  return IsRowSelected(aRowIdx);
+}
+
+uint32_t
+XULListboxAccessible::SelectedCellCount()
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+    do_QueryInterface(mContent);
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  nsCOMPtr<nsIDOMNodeList> selectedItems;
+  control->GetSelectedItems(getter_AddRefs(selectedItems));
+  if (!selectedItems)
+    return 0;
+
+  uint32_t selectedItemsCount = 0;
+  nsresult rv = selectedItems->GetLength(&selectedItemsCount);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  return selectedItemsCount * ColCount();
+}
+
+uint32_t
+XULListboxAccessible::SelectedColCount()
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+    do_QueryInterface(mContent);
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  int32_t selectedRowCount = 0;
+  nsresult rv = control->GetSelectedCount(&selectedRowCount);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  return selectedRowCount > 0 &&
+   selectedRowCount == static_cast<int32_t>(RowCount()) ? ColCount() : 0;
+}
+
+uint32_t
+XULListboxAccessible::SelectedRowCount()
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+    do_QueryInterface(mContent);
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  int32_t selectedRowCount = 0;
+  nsresult rv = control->GetSelectedCount(&selectedRowCount);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  return selectedRowCount >= 0 ? selectedRowCount : 0;
+}
+
+void
+XULListboxAccessible::SelectedCells(nsTArray<Accessible*>* aCells)
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+    do_QueryInterface(mContent);
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  nsCOMPtr<nsIDOMNodeList> selectedItems;
+  control->GetSelectedItems(getter_AddRefs(selectedItems));
+  if (!selectedItems)
+    return;
+
+  uint32_t selectedItemsCount = 0;
+  DebugOnly<nsresult> rv = selectedItems->GetLength(&selectedItemsCount);
+  NS_ASSERTION(NS_SUCCEEDED(rv), "GetLength() Shouldn't fail!");
+
+  for (uint32_t index = 0; index < selectedItemsCount; index++) {
+    nsCOMPtr<nsIDOMNode> itemNode;
+    selectedItems->Item(index, getter_AddRefs(itemNode));
+    nsCOMPtr<nsIContent> itemContent(do_QueryInterface(itemNode));
+    Accessible* item = mDoc->GetAccessible(itemContent);
+
+    if (item) {
+      uint32_t cellCount = item->ChildCount();
+      for (uint32_t cellIdx = 0; cellIdx < cellCount; cellIdx++) {
+        Accessible* cell = mChildren[cellIdx];
+        if (cell->Role() == roles::CELL)
+          aCells->AppendElement(cell);
+      }
+    }
+  }
+}
+
+void
+XULListboxAccessible::SelectedCellIndices(nsTArray<uint32_t>* aCells)
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+    do_QueryInterface(mContent);
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  nsCOMPtr<nsIDOMNodeList> selectedItems;
+  control->GetSelectedItems(getter_AddRefs(selectedItems));
+  if (!selectedItems)
+    return;
+
+  uint32_t selectedItemsCount = 0;
+  DebugOnly<nsresult> rv = selectedItems->GetLength(&selectedItemsCount);
+  NS_ASSERTION(NS_SUCCEEDED(rv), "GetLength() Shouldn't fail!");
+
+  uint32_t colCount = ColCount();
+  aCells->SetCapacity(selectedItemsCount * colCount);
+  aCells->AppendElements(selectedItemsCount * colCount);
+
+  for (uint32_t selItemsIdx = 0, cellsIdx = 0;
+       selItemsIdx < selectedItemsCount; selItemsIdx++) {
+
+    nsCOMPtr<nsIDOMNode> itemNode;
+    selectedItems->Item(selItemsIdx, getter_AddRefs(itemNode));
+    nsCOMPtr<nsIDOMXULSelectControlItemElement> item =
+      do_QueryInterface(itemNode);
+
+    if (item) {
+      int32_t itemIdx = -1;
+      control->GetIndexOfItem(item, &itemIdx);
+      if (itemIdx >= 0)
+        for (uint32_t colIdx = 0; colIdx < colCount; colIdx++, cellsIdx++)
+          aCells->ElementAt(cellsIdx) = itemIdx * colCount + colIdx;
+    }
+  }
+}
+
+void
+XULListboxAccessible::SelectedColIndices(nsTArray<uint32_t>* aCols)
+{
+  uint32_t selColCount = SelectedColCount();
+  aCols->SetCapacity(selColCount);
+
+  for (uint32_t colIdx = 0; colIdx < selColCount; colIdx++)
+    aCols->AppendElement(colIdx);
+}
+
+void
+XULListboxAccessible::SelectedRowIndices(nsTArray<uint32_t>* aRows)
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+    do_QueryInterface(mContent);
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  nsCOMPtr<nsIDOMNodeList> selectedItems;
+  control->GetSelectedItems(getter_AddRefs(selectedItems));
+  if (!selectedItems)
+    return;
+
+  uint32_t rowCount = 0;
+  DebugOnly<nsresult> rv = selectedItems->GetLength(&rowCount);
+  NS_ASSERTION(NS_SUCCEEDED(rv), "GetLength() Shouldn't fail!");
+
+  if (!rowCount)
+    return;
+
+  aRows->SetCapacity(rowCount);
+  aRows->AppendElements(rowCount);
+
+  for (uint32_t rowIdx = 0; rowIdx < rowCount; rowIdx++) {
+    nsCOMPtr<nsIDOMNode> itemNode;
+    selectedItems->Item(rowIdx, getter_AddRefs(itemNode));
+    nsCOMPtr<nsIDOMXULSelectControlItemElement> item =
+      do_QueryInterface(itemNode);
+
+    if (item) {
+      int32_t itemIdx = -1;
+      control->GetIndexOfItem(item, &itemIdx);
+      if (itemIdx >= 0)
+        aRows->ElementAt(rowIdx) = itemIdx;
+    }
+  }
+}
+
+void
+XULListboxAccessible::SelectRow(uint32_t aRowIdx)
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+    do_QueryInterface(mContent);
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> item;
+  control->GetItemAtIndex(aRowIdx, getter_AddRefs(item));
+  control->SelectItem(item);
+}
+
+void
+XULListboxAccessible::UnselectRow(uint32_t aRowIdx)
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+    do_QueryInterface(mContent);
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> item;
+  control->GetItemAtIndex(aRowIdx, getter_AddRefs(item));
+  control->RemoveItemFromSelection(item);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListboxAccessible: Widgets
+
+bool
+XULListboxAccessible::IsWidget() const
+{
+  return true;
+}
+
+bool
+XULListboxAccessible::IsActiveWidget() const
+{
+  if (IsAutoCompletePopup()) {
+    nsCOMPtr<nsIAutoCompletePopup> autoCompletePopupElm =
+      do_QueryInterface(mContent->GetParent());
+
+    if (autoCompletePopupElm) {
+      bool isOpen = false;
+      autoCompletePopupElm->GetPopupOpen(&isOpen);
+      return isOpen;
+    }
+  }
+  return FocusMgr()->HasDOMFocus(mContent);
+}
+
+bool
+XULListboxAccessible::AreItemsOperable() const
+{
+  if (IsAutoCompletePopup()) {
+    nsCOMPtr<nsIAutoCompletePopup> autoCompletePopupElm =
+      do_QueryInterface(mContent->GetParent());
+
+    if (autoCompletePopupElm) {
+      bool isOpen = false;
+      autoCompletePopupElm->GetPopupOpen(&isOpen);
+      return isOpen;
+    }
+  }
+  return true;
+}
+
+Accessible*
+XULListboxAccessible::ContainerWidget() const
+{
+  if (IsAutoCompletePopup()) {
+    // This works for XUL autocompletes. It doesn't work for HTML forms
+    // autocomplete because of potential crossprocess calls (when autocomplete
+    // lives in content process while popup lives in chrome process). If that's
+    // a problem then rethink Widgets interface.
+    nsCOMPtr<nsIDOMXULMenuListElement> menuListElm =
+      do_QueryInterface(mContent->GetParent());
+    if (menuListElm) {
+      nsCOMPtr<nsIDOMNode> inputElm;
+      menuListElm->GetInputField(getter_AddRefs(inputElm));
+      if (inputElm) {
+        nsCOMPtr<nsINode> inputNode = do_QueryInterface(inputElm);
+        if (inputNode) {
+          Accessible* input =
+            mDoc->GetAccessible(inputNode);
+          return input ? input->ContainerWidget() : nullptr;
+        }
+      }
+    }
+  }
+  return nullptr;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListitemAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULListitemAccessible::
+  XULListitemAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  XULMenuitemAccessible(aContent, aDoc)
+{
+  mIsCheckbox = mContent->AttrValueIs(kNameSpaceID_None,
+                                      nsGkAtoms::type,
+                                      nsGkAtoms::checkbox,
+                                      eCaseMatters);
+  mType = eXULListItemType;
+
+  // Walk XBL anonymous children for list items. Overrides the flag value from
+  // base XULMenuitemAccessible class.
+  mStateFlags &= ~eNoXBLKids;
+}
+
+XULListitemAccessible::~XULListitemAccessible()
+{
+}
+
+NS_IMPL_ISUPPORTS_INHERITED0(XULListitemAccessible, Accessible)
+
+Accessible*
+XULListitemAccessible::GetListAccessible() const
+{
+  if (IsDefunct())
+    return nullptr;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> listItem =
+    do_QueryInterface(mContent);
+  if (!listItem)
+    return nullptr;
+
+  nsCOMPtr<nsIDOMXULSelectControlElement> list;
+  listItem->GetControl(getter_AddRefs(list));
+
+  nsCOMPtr<nsIContent> listContent(do_QueryInterface(list));
+  if (!listContent)
+    return nullptr;
+
+  return mDoc->GetAccessible(listContent);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListitemAccessible Accessible
+
+void
+XULListitemAccessible::Description(nsString& aDesc)
+{
+  AccessibleWrap::Description(aDesc);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListitemAccessible: Accessible
+
+/**
+  * If there is a Listcell as a child ( not anonymous ) use it, otherwise
+  *   default to getting the name from GetXULName
+  */
+ENameValueFlag
+XULListitemAccessible::NativeName(nsString& aName)
+{
+  nsIContent* childContent = mContent->GetFirstChild();
+  if (childContent) {
+    if (childContent->NodeInfo()->Equals(nsGkAtoms::listcell,
+                                         kNameSpaceID_XUL)) {
+      childContent->GetAttr(kNameSpaceID_None, nsGkAtoms::label, aName);
+      return eNameOK;
+    }
+  }
+
+  return Accessible::NativeName(aName);
+}
+
+role
+XULListitemAccessible::NativeRole()
+{
+  Accessible* list = GetListAccessible();
+  if (!list) {
+    NS_ERROR("No list accessible for listitem accessible!");
+    return roles::NOTHING;
+  }
+
+  if (list->Role() == roles::TABLE)
+    return roles::ROW;
+
+  if (mIsCheckbox)
+    return roles::CHECK_RICH_OPTION;
+
+  if (mParent && mParent->Role() == roles::COMBOBOX_LIST)
+    return roles::COMBOBOX_OPTION;
+
+  return roles::RICH_OPTION;
+}
+
+uint64_t
+XULListitemAccessible::NativeState()
+{
+  if (mIsCheckbox)
+    return XULMenuitemAccessible::NativeState();
+
+  uint64_t states = NativeInteractiveState();
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> listItem =
+    do_QueryInterface(mContent);
+
+  if (listItem) {
+    bool isSelected;
+    listItem->GetSelected(&isSelected);
+    if (isSelected)
+      states |= states::SELECTED;
+
+    if (FocusMgr()->IsFocused(this))
+      states |= states::FOCUSED;
+  }
+
+  return states;
+}
+
+uint64_t
+XULListitemAccessible::NativeInteractiveState() const
+{
+  return NativelyUnavailable() || (mParent && mParent->NativelyUnavailable()) ?
+    states::UNAVAILABLE : states::FOCUSABLE | states::SELECTABLE;
+}
+
+void
+XULListitemAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  if (aIndex == eAction_Click && mIsCheckbox) {
+    uint64_t states = NativeState();
+    if (states & states::CHECKED)
+      aName.AssignLiteral("uncheck");
+    else
+      aName.AssignLiteral("check");
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListitemAccessible: Widgets
+
+Accessible*
+XULListitemAccessible::ContainerWidget() const
+{
+  return Parent();
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListCellAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULListCellAccessible::
+  XULListCellAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  HyperTextAccessibleWrap(aContent, aDoc)
+{
+  mGenericTypes |= eTableCell;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsISupports
+
+NS_IMPL_ISUPPORTS_INHERITED0(XULListCellAccessible,
+                             HyperTextAccessible)
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListCellAccessible: TableCell
+
+TableAccessible*
+XULListCellAccessible::Table() const
+{
+  Accessible* thisRow = Parent();
+  if (!thisRow || thisRow->Role() != roles::ROW)
+    return nullptr;
+
+  Accessible* table = thisRow->Parent();
+  if (!table || table->Role() != roles::TABLE)
+    return nullptr;
+
+  return table->AsTable();
+}
+
+uint32_t
+XULListCellAccessible::ColIdx() const
+{
+  Accessible* row = Parent();
+  if (!row)
+    return 0;
+
+  int32_t indexInRow = IndexInParent();
+  uint32_t colIdx = 0;
+  for (int32_t idx = 0; idx < indexInRow; idx++) {
+    Accessible* cell = row->GetChildAt(idx);
+    roles::Role role = cell->Role();
+    if (role == roles::CELL || role == roles::GRID_CELL ||
+        role == roles::ROWHEADER || role == roles::COLUMNHEADER)
+      colIdx++;
+  }
+
+  return colIdx;
+}
+
+uint32_t
+XULListCellAccessible::RowIdx() const
+{
+  Accessible* row = Parent();
+  if (!row)
+    return 0;
+
+  Accessible* table = row->Parent();
+  if (!table)
+    return 0;
+
+  int32_t indexInTable = row->IndexInParent();
+  uint32_t rowIdx = 0;
+  for (int32_t idx = 0; idx < indexInTable; idx++) {
+    row = table->GetChildAt(idx);
+    if (row->Role() == roles::ROW)
+      rowIdx++;
+  }
+
+  return rowIdx;
+}
+
+void
+XULListCellAccessible::ColHeaderCells(nsTArray<Accessible*>* aCells)
+{
+  TableAccessible* table = Table();
+  NS_ASSERTION(table, "cell not in a table!");
+  if (!table)
+    return;
+
+  // Get column header cell from XUL listhead.
+  Accessible* list = nullptr;
+
+  Accessible* tableAcc = table->AsAccessible();
+  uint32_t tableChildCount = tableAcc->ChildCount();
+  for (uint32_t childIdx = 0; childIdx < tableChildCount; childIdx++) {
+    Accessible* child = tableAcc->GetChildAt(childIdx);
+    if (child->Role() == roles::LIST) {
+      list = child;
+      break;
+    }
+  }
+
+  if (list) {
+    Accessible* headerCell = list->GetChildAt(ColIdx());
+    if (headerCell) {
+      aCells->AppendElement(headerCell);
+      return;
+    }
+  }
+
+  // No column header cell from XUL markup, try to get it from ARIA markup.
+  TableCellAccessible::ColHeaderCells(aCells);
+}
+
+bool
+XULListCellAccessible::Selected()
+{
+  TableAccessible* table = Table();
+  NS_ENSURE_TRUE(table, false); // we expect to be in a listbox (table)
+
+  return table->IsRowSelected(RowIdx());
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListCellAccessible. Accessible implementation
+
+role
+XULListCellAccessible::NativeRole()
+{
+  return roles::CELL;
+}
+
+already_AddRefed<nsIPersistentProperties>
+XULListCellAccessible::NativeAttributes()
+{
+  nsCOMPtr<nsIPersistentProperties> attributes =
+    HyperTextAccessibleWrap::NativeAttributes();
+
+  // "table-cell-index" attribute
+  TableAccessible* table = Table();
+  if (!table) // we expect to be in a listbox (table)
+    return attributes.forget();
+
+  nsAutoString stringIdx;
+  stringIdx.AppendInt(table->CellIndexAt(RowIdx(), ColIdx()));
+  nsAccUtils::SetAccAttr(attributes, nsGkAtoms::tableCellIndex, stringIdx);
+
+  return attributes.forget();
+}
diff --git a/accessible/xul/XULListboxAccessible.h b/accessible/xul/XULListboxAccessible.h
new file mode 100644
index 000000000..057838035
--- /dev/null
+++ b/accessible/xul/XULListboxAccessible.h
@@ -0,0 +1,173 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_XULListboxAccessible_h__
+#define mozilla_a11y_XULListboxAccessible_h__
+
+#include "BaseAccessibles.h"
+#include "TableAccessible.h"
+#include "TableCellAccessible.h"
+#include "xpcAccessibleTable.h"
+#include "xpcAccessibleTableCell.h"
+#include "XULMenuAccessible.h"
+#include "XULSelectControlAccessible.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * XULColumAccessible are accessible for list and tree columns elements
+ * (xul:treecols and xul:listcols).
+ */
+class XULColumAccessible : public AccessibleWrap
+{
+public:
+  XULColumAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+};
+
+/**
+ * XULColumnItemAccessible are accessibles for list and tree column elements
+ * (xul:listcol and xul:treecol).
+ */
+class XULColumnItemAccessible : public LeafAccessible
+{
+public:
+  XULColumnItemAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+
+  enum { eAction_Click = 0 };
+};
+
+/*
+ * A class the represents the XUL Listbox widget.
+ */
+class XULListboxAccessible : public XULSelectControlAccessible,
+                             public TableAccessible
+{
+public:
+  XULListboxAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // TableAccessible
+  virtual uint32_t ColCount() override;
+  virtual uint32_t RowCount() override;
+  virtual Accessible* CellAt(uint32_t aRowIndex, uint32_t aColumnIndex) override;
+  virtual bool IsColSelected(uint32_t aColIdx) override;
+  virtual bool IsRowSelected(uint32_t aRowIdx) override;
+  virtual bool IsCellSelected(uint32_t aRowIdx, uint32_t aColIdx) override;
+  virtual uint32_t SelectedCellCount() override;
+  virtual uint32_t SelectedColCount() override;
+  virtual uint32_t SelectedRowCount() override;
+  virtual void SelectedCells(nsTArray<Accessible*>* aCells) override;
+  virtual void SelectedCellIndices(nsTArray<uint32_t>* aCells) override;
+  virtual void SelectedColIndices(nsTArray<uint32_t>* aCols) override;
+  virtual void SelectedRowIndices(nsTArray<uint32_t>* aRows) override;
+  virtual void SelectRow(uint32_t aRowIdx) override;
+  virtual void UnselectRow(uint32_t aRowIdx) override;
+  virtual Accessible* AsAccessible() override { return this; }
+
+  // Accessible
+  virtual void Value(nsString& aValue) override;
+  virtual TableAccessible* AsTable() override { return this; }
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+
+  virtual Accessible* ContainerWidget() const override;
+
+protected:
+  virtual ~XULListboxAccessible() {}
+
+  bool IsMulticolumn() { return ColCount() > 1; }
+};
+
+/**
+  * Listitems -- used in listboxes
+  */
+class XULListitemAccessible : public XULMenuitemAccessible
+{
+public:
+  enum { eAction_Click = 0 };
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  XULListitemAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual void Description(nsString& aDesc) override;
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+  virtual uint64_t NativeInteractiveState() const override;
+
+  // Actions
+  virtual void ActionNameAt(uint8_t index, nsAString& aName) override;
+
+  // Widgets
+  virtual Accessible* ContainerWidget() const override;
+
+protected:
+  virtual ~XULListitemAccessible();
+
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) override;
+
+  // XULListitemAccessible
+
+  /**
+   * Return listbox accessible for the listitem.
+   */
+  Accessible* GetListAccessible() const;
+
+private:
+  bool mIsCheckbox;
+};
+
+/**
+ * Class represents xul:listcell.
+ */
+class XULListCellAccessible : public HyperTextAccessibleWrap,
+                              public TableCellAccessible
+{
+public:
+  XULListCellAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // nsISupports
+  NS_DECL_ISUPPORTS_INHERITED
+
+  // Accessible
+  virtual TableCellAccessible* AsTableCell() override { return this; }
+  virtual already_AddRefed<nsIPersistentProperties> NativeAttributes() override;
+  virtual a11y::role NativeRole() override;
+
+  // TableCellAccessible
+  virtual TableAccessible* Table() const override;
+  virtual uint32_t ColIdx() const override;
+  virtual uint32_t RowIdx() const override;
+  virtual void ColHeaderCells(nsTArray<Accessible*>* aHeaderCells) override;
+  virtual bool Selected() override;
+
+protected:
+  virtual ~XULListCellAccessible() {}
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULMenuAccessible.cpp b/accessible/xul/XULMenuAccessible.cpp
new file mode 100644
index 000000000..f93e9ad99
--- /dev/null
+++ b/accessible/xul/XULMenuAccessible.cpp
@@ -0,0 +1,591 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "XULMenuAccessible.h"
+
+#include "Accessible-inl.h"
+#include "nsAccessibilityService.h"
+#include "nsAccUtils.h"
+#include "DocAccessible.h"
+#include "Role.h"
+#include "States.h"
+#include "XULFormControlAccessible.h"
+
+#include "nsIDOMElement.h"
+#include "nsIDOMXULElement.h"
+#include "nsIMutableArray.h"
+#include "nsIDOMXULContainerElement.h"
+#include "nsIDOMXULSelectCntrlItemEl.h"
+#include "nsIDOMXULMultSelectCntrlEl.h"
+#include "nsIDOMKeyEvent.h"
+#include "nsIServiceManager.h"
+#include "nsIPresShell.h"
+#include "nsIContent.h"
+#include "nsMenuBarFrame.h"
+#include "nsMenuPopupFrame.h"
+
+#include "mozilla/Preferences.h"
+#include "mozilla/LookAndFeel.h"
+#include "mozilla/dom/Element.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenuitemAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULMenuitemAccessible::
+  XULMenuitemAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+  mStateFlags |= eNoXBLKids;
+}
+
+uint64_t
+XULMenuitemAccessible::NativeState()
+{
+  uint64_t state = Accessible::NativeState();
+
+  // Has Popup?
+  if (mContent->NodeInfo()->Equals(nsGkAtoms::menu, kNameSpaceID_XUL)) {
+    state |= states::HASPOPUP;
+    if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::open))
+      state |= states::EXPANDED;
+    else
+      state |= states::COLLAPSED;
+  }
+
+  // Checkable/checked?
+  static nsIContent::AttrValuesArray strings[] =
+    { &nsGkAtoms::radio, &nsGkAtoms::checkbox, nullptr };
+
+  if (mContent->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::type, strings,
+                                eCaseMatters) >= 0) {
+
+    // Checkable?
+    state |= states::CHECKABLE;
+
+    // Checked?
+    if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::checked,
+                              nsGkAtoms::_true, eCaseMatters))
+      state |= states::CHECKED;
+  }
+
+  // Combo box listitem
+  bool isComboboxOption = (Role() == roles::COMBOBOX_OPTION);
+  if (isComboboxOption) {
+    // Is selected?
+    bool isSelected = false;
+    nsCOMPtr<nsIDOMXULSelectControlItemElement>
+      item(do_QueryInterface(mContent));
+    NS_ENSURE_TRUE(item, state);
+    item->GetSelected(&isSelected);
+
+    // Is collapsed?
+    bool isCollapsed = false;
+    Accessible* parent = Parent();
+    if (parent && parent->State() & states::INVISIBLE)
+      isCollapsed = true;
+
+    if (isSelected) {
+      state |= states::SELECTED;
+
+      // Selected and collapsed?
+      if (isCollapsed) {
+        // Set selected option offscreen/invisible according to combobox state
+        Accessible* grandParent = parent->Parent();
+        if (!grandParent)
+          return state;
+        NS_ASSERTION(grandParent->Role() == roles::COMBOBOX,
+                     "grandparent of combobox listitem is not combobox");
+        uint64_t grandParentState = grandParent->State();
+        state &= ~(states::OFFSCREEN | states::INVISIBLE);
+        state |= (grandParentState & states::OFFSCREEN) |
+                 (grandParentState & states::INVISIBLE) |
+                 (grandParentState & states::OPAQUE1);
+      } // isCollapsed
+    } // isSelected
+  } // ROLE_COMBOBOX_OPTION
+
+  return state;
+}
+
+uint64_t
+XULMenuitemAccessible::NativeInteractiveState() const
+{
+  if (NativelyUnavailable()) {
+    // Note: keep in sinc with nsXULPopupManager::IsValidMenuItem() logic.
+    bool skipNavigatingDisabledMenuItem = true;
+    nsMenuFrame* menuFrame = do_QueryFrame(GetFrame());
+    if (!menuFrame || !menuFrame->IsOnMenuBar()) {
+      skipNavigatingDisabledMenuItem = LookAndFeel::
+        GetInt(LookAndFeel::eIntID_SkipNavigatingDisabledMenuItem, 0) != 0;
+    }
+
+    if (skipNavigatingDisabledMenuItem)
+      return states::UNAVAILABLE;
+
+    return states::UNAVAILABLE | states::FOCUSABLE | states::SELECTABLE;
+  }
+
+  return states::FOCUSABLE | states::SELECTABLE;
+}
+
+ENameValueFlag
+XULMenuitemAccessible::NativeName(nsString& aName)
+{
+  mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::label, aName);
+  return eNameOK;
+}
+
+void
+XULMenuitemAccessible::Description(nsString& aDescription)
+{
+  mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::description,
+                    aDescription);
+}
+
+KeyBinding
+XULMenuitemAccessible::AccessKey() const
+{
+  // Return menu accesskey: N or Alt+F.
+  static int32_t gMenuAccesskeyModifier = -1;  // magic value of -1 indicates unitialized state
+
+  // We do not use nsCoreUtils::GetAccesskeyFor() because accesskeys for
+  // menu are't registered by EventStateManager.
+  nsAutoString accesskey;
+  mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey,
+                    accesskey);
+  if (accesskey.IsEmpty())
+    return KeyBinding();
+
+  uint32_t modifierKey = 0;
+
+  Accessible* parentAcc = Parent();
+  if (parentAcc) {
+    if (parentAcc->NativeRole() == roles::MENUBAR) {
+      // If top level menu item, add Alt+ or whatever modifier text to string
+      // No need to cache pref service, this happens rarely
+      if (gMenuAccesskeyModifier == -1) {
+        // Need to initialize cached global accesskey pref
+        gMenuAccesskeyModifier = Preferences::GetInt("ui.key.menuAccessKey", 0);
+      }
+
+      switch (gMenuAccesskeyModifier) {
+        case nsIDOMKeyEvent::DOM_VK_CONTROL:
+          modifierKey = KeyBinding::kControl;
+          break;
+        case nsIDOMKeyEvent::DOM_VK_ALT:
+          modifierKey = KeyBinding::kAlt;
+          break;
+        case nsIDOMKeyEvent::DOM_VK_META:
+          modifierKey = KeyBinding::kMeta;
+          break;
+        case nsIDOMKeyEvent::DOM_VK_WIN:
+          modifierKey = KeyBinding::kOS;
+          break;
+      }
+    }
+  }
+
+  return KeyBinding(accesskey[0], modifierKey);
+}
+
+KeyBinding
+XULMenuitemAccessible::KeyboardShortcut() const
+{
+  nsAutoString keyElmId;
+  mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::key, keyElmId);
+  if (keyElmId.IsEmpty())
+    return KeyBinding();
+
+  nsIContent* keyElm = mContent->OwnerDoc()->GetElementById(keyElmId);
+  if (!keyElm)
+    return KeyBinding();
+
+  uint32_t key = 0;
+
+  nsAutoString keyStr;
+  keyElm->GetAttr(kNameSpaceID_None, nsGkAtoms::key, keyStr);
+  if (keyStr.IsEmpty()) {
+    nsAutoString keyCodeStr;
+    keyElm->GetAttr(kNameSpaceID_None, nsGkAtoms::keycode, keyCodeStr);
+    nsresult errorCode;
+    key = keyStr.ToInteger(&errorCode, kAutoDetect);
+  } else {
+    key = keyStr[0];
+  }
+
+  nsAutoString modifiersStr;
+  keyElm->GetAttr(kNameSpaceID_None, nsGkAtoms::modifiers, modifiersStr);
+
+  uint32_t modifierMask = 0;
+  if (modifiersStr.Find("shift") != -1)
+    modifierMask |= KeyBinding::kShift;
+  if (modifiersStr.Find("alt") != -1)
+    modifierMask |= KeyBinding::kAlt;
+  if (modifiersStr.Find("meta") != -1)
+    modifierMask |= KeyBinding::kMeta;
+  if (modifiersStr.Find("os") != -1)
+    modifierMask |= KeyBinding::kOS;
+  if (modifiersStr.Find("control") != -1)
+    modifierMask |= KeyBinding::kControl;
+  if (modifiersStr.Find("accel") != -1) {
+    modifierMask |= KeyBinding::AccelModifier();
+  }
+
+  return KeyBinding(key, modifierMask);
+}
+
+role
+XULMenuitemAccessible::NativeRole()
+{
+  nsCOMPtr<nsIDOMXULContainerElement> xulContainer(do_QueryInterface(mContent));
+  if (xulContainer)
+    return roles::PARENT_MENUITEM;
+
+  if (mParent && mParent->Role() == roles::COMBOBOX_LIST)
+    return roles::COMBOBOX_OPTION;
+
+  if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
+                            nsGkAtoms::radio, eCaseMatters)) 
+    return roles::RADIO_MENU_ITEM;
+
+  if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
+                            nsGkAtoms::checkbox,
+                            eCaseMatters)) 
+    return roles::CHECK_MENU_ITEM;
+
+  return roles::MENUITEM;
+}
+
+int32_t
+XULMenuitemAccessible::GetLevelInternal()
+{
+  return nsAccUtils::GetLevelForXULContainerItem(mContent);
+}
+
+bool
+XULMenuitemAccessible::DoAction(uint8_t index)
+{
+  if (index == eAction_Click) {   // default action
+    DoCommand();
+    return true;
+  }
+
+  return false;
+}
+
+void
+XULMenuitemAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  if (aIndex == eAction_Click)
+    aName.AssignLiteral("click");
+}
+
+uint8_t
+XULMenuitemAccessible::ActionCount()
+{
+  return 1;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenuitemAccessible: Widgets
+
+bool
+XULMenuitemAccessible::IsActiveWidget() const
+{
+  // Parent menu item is a widget, it's active when its popup is open.
+  nsIContent* menuPopupContent = mContent->GetFirstChild();
+  if (menuPopupContent) {
+    nsMenuPopupFrame* menuPopupFrame =
+      do_QueryFrame(menuPopupContent->GetPrimaryFrame());
+    return menuPopupFrame && menuPopupFrame->IsOpen();
+  }
+  return false;
+}
+
+bool
+XULMenuitemAccessible::AreItemsOperable() const
+{
+  // Parent menu item is a widget, its items are operable when its popup is open.
+  nsIContent* menuPopupContent = mContent->GetFirstChild();
+  if (menuPopupContent) {
+    nsMenuPopupFrame* menuPopupFrame =
+      do_QueryFrame(menuPopupContent->GetPrimaryFrame());
+    return menuPopupFrame && menuPopupFrame->IsOpen();
+  }
+  return false;
+}
+
+Accessible*
+XULMenuitemAccessible::ContainerWidget() const
+{
+  nsMenuFrame* menuFrame = do_QueryFrame(GetFrame());
+  if (menuFrame) {
+    nsMenuParent* menuParent = menuFrame->GetMenuParent();
+    if (menuParent) {
+      if (menuParent->IsMenuBar()) // menubar menu
+        return mParent;
+
+      // a menupoup or parent menu item
+      if (menuParent->IsMenu())
+        return mParent;
+
+      // otherwise it's different kind of popups (like panel or tooltip), it
+      // shouldn't be a real case.
+    }
+  }
+  return nullptr;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenuSeparatorAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULMenuSeparatorAccessible::
+  XULMenuSeparatorAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  XULMenuitemAccessible(aContent, aDoc)
+{
+}
+
+uint64_t
+XULMenuSeparatorAccessible::NativeState()
+{
+  // Isn't focusable, but can be offscreen/invisible -- only copy those states
+  return XULMenuitemAccessible::NativeState() &
+    (states::OFFSCREEN | states::INVISIBLE);
+}
+
+ENameValueFlag
+XULMenuSeparatorAccessible::NativeName(nsString& aName)
+{
+  return eNameOK;
+}
+
+role
+XULMenuSeparatorAccessible::NativeRole()
+{
+  return roles::SEPARATOR;
+}
+
+bool
+XULMenuSeparatorAccessible::DoAction(uint8_t index)
+{
+  return false;
+}
+
+void
+XULMenuSeparatorAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  aName.Truncate();
+}
+
+uint8_t
+XULMenuSeparatorAccessible::ActionCount()
+{
+  return 0;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenupopupAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULMenupopupAccessible::
+  XULMenupopupAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  XULSelectControlAccessible(aContent, aDoc)
+{
+  nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(GetFrame());
+  if (menuPopupFrame && menuPopupFrame->IsMenu())
+    mType = eMenuPopupType;
+
+  // May be the anonymous <menupopup> inside <menulist> (a combobox)
+  mSelectControl = do_QueryInterface(mContent->GetFlattenedTreeParent());
+  if (!mSelectControl)
+    mGenericTypes &= ~eSelect;
+
+  mStateFlags |= eNoXBLKids;
+}
+
+uint64_t
+XULMenupopupAccessible::NativeState()
+{
+  uint64_t state = Accessible::NativeState();
+
+#ifdef DEBUG
+  // We are onscreen if our parent is active
+  bool isActive = mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::menuactive);
+  if (!isActive) {
+    Accessible* parent = Parent();
+    if (parent) {
+      nsIContent* parentContent = parent->GetContent();
+      if (parentContent)
+        isActive = parentContent->HasAttr(kNameSpaceID_None, nsGkAtoms::open);
+    }
+  }
+
+  NS_ASSERTION(isActive || (state & states::INVISIBLE),
+               "XULMenupopup doesn't have INVISIBLE when it's inactive");
+#endif
+
+  if (state & states::INVISIBLE)
+    state |= states::OFFSCREEN | states::COLLAPSED;
+
+  return state;
+}
+
+ENameValueFlag
+XULMenupopupAccessible::NativeName(nsString& aName)
+{
+  nsIContent* content = mContent;
+  while (content && aName.IsEmpty()) {
+    content->GetAttr(kNameSpaceID_None, nsGkAtoms::label, aName);
+    content = content->GetFlattenedTreeParent();
+  }
+
+  return eNameOK;
+}
+
+role
+XULMenupopupAccessible::NativeRole()
+{
+  // If accessible is not bound to the tree (this happens while children are
+  // cached) return general role.
+  if (mParent) {
+    roles::Role role = mParent->Role();
+    if (role == roles::COMBOBOX || role == roles::AUTOCOMPLETE)
+      return roles::COMBOBOX_LIST;
+
+    if (role == roles::PUSHBUTTON) {
+      // Some widgets like the search bar have several popups, owned by buttons.
+      Accessible* grandParent = mParent->Parent();
+      if (grandParent && grandParent->Role() == roles::AUTOCOMPLETE)
+        return roles::COMBOBOX_LIST;
+    }
+  }
+
+  return roles::MENUPOPUP;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenupopupAccessible: Widgets
+
+bool
+XULMenupopupAccessible::IsWidget() const
+{
+  return true;
+}
+
+bool
+XULMenupopupAccessible::IsActiveWidget() const
+{
+  // If menupopup is a widget (the case of context menus) then active when open.
+  nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(GetFrame());
+  return menuPopupFrame && menuPopupFrame->IsOpen();
+}
+
+bool
+XULMenupopupAccessible::AreItemsOperable() const
+{
+  nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(GetFrame());
+  return menuPopupFrame && menuPopupFrame->IsOpen();
+}
+
+Accessible*
+XULMenupopupAccessible::ContainerWidget() const
+{
+  DocAccessible* document = Document();
+
+  nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(GetFrame());
+  while (menuPopupFrame) {
+    Accessible* menuPopup =
+      document->GetAccessible(menuPopupFrame->GetContent());
+    if (!menuPopup) // shouldn't be a real case
+      return nullptr;
+
+    nsMenuFrame* menuFrame = do_QueryFrame(menuPopupFrame->GetParent());
+    if (!menuFrame) // context menu or popups
+      return nullptr;
+
+    nsMenuParent* menuParent = menuFrame->GetMenuParent();
+    if (!menuParent) // menulist or menubutton
+      return menuPopup->Parent();
+
+    if (menuParent->IsMenuBar()) { // menubar menu
+      nsMenuBarFrame* menuBarFrame = static_cast<nsMenuBarFrame*>(menuParent);
+      return document->GetAccessible(menuBarFrame->GetContent());
+    }
+
+    // different kind of popups like panel or tooltip
+    if (!menuParent->IsMenu())
+      return nullptr;
+
+    menuPopupFrame = static_cast<nsMenuPopupFrame*>(menuParent);
+  }
+
+  NS_NOTREACHED("Shouldn't be a real case.");
+  return nullptr;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenubarAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULMenubarAccessible::
+  XULMenubarAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+}
+
+ENameValueFlag
+XULMenubarAccessible::NativeName(nsString& aName)
+{
+  aName.AssignLiteral("Application");
+  return eNameOK;
+}
+
+role
+XULMenubarAccessible::NativeRole()
+{
+  return roles::MENUBAR;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenubarAccessible: Widgets
+
+bool
+XULMenubarAccessible::IsActiveWidget() const
+{
+  nsMenuBarFrame* menuBarFrame = do_QueryFrame(GetFrame());
+  return menuBarFrame && menuBarFrame->IsActive();
+}
+
+bool
+XULMenubarAccessible::AreItemsOperable() const
+{
+  return true;
+}
+
+Accessible*
+XULMenubarAccessible::CurrentItem()
+{
+  nsMenuBarFrame* menuBarFrame = do_QueryFrame(GetFrame());
+  if (menuBarFrame) {
+    nsMenuFrame* menuFrame = menuBarFrame->GetCurrentMenuItem();
+    if (menuFrame) {
+      nsIContent* menuItemNode = menuFrame->GetContent();
+      return mDoc->GetAccessible(menuItemNode);
+    }
+  }
+  return nullptr;
+}
+
+void
+XULMenubarAccessible::SetCurrentItem(Accessible* aItem)
+{
+  NS_ERROR("XULMenubarAccessible::SetCurrentItem not implemented");
+}
diff --git a/accessible/xul/XULMenuAccessible.h b/accessible/xul/XULMenuAccessible.h
new file mode 100644
index 000000000..6280db17d
--- /dev/null
+++ b/accessible/xul/XULMenuAccessible.h
@@ -0,0 +1,122 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_XULMenuAccessible_h__
+#define mozilla_a11y_XULMenuAccessible_h__
+
+#include "AccessibleWrap.h"
+#include "nsIDOMXULSelectCntrlEl.h"
+#include "XULSelectControlAccessible.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * Used for XUL menu, menuitem elements.
+ */
+class XULMenuitemAccessible : public AccessibleWrap
+{
+public:
+  enum { eAction_Click = 0 };
+
+  XULMenuitemAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual void Description(nsString& aDescription) override;
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+  virtual uint64_t NativeInteractiveState() const override;
+  virtual int32_t GetLevelInternal() override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+  virtual KeyBinding AccessKey() const override;
+  virtual KeyBinding KeyboardShortcut() const override;
+
+  // Widgets
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+  virtual Accessible* ContainerWidget() const override;
+
+protected:
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) override;
+};
+
+/**
+ * Used for XUL menuseparator element.
+ */
+class XULMenuSeparatorAccessible : public XULMenuitemAccessible
+{
+public:
+  XULMenuSeparatorAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+
+protected:
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) override;
+};
+
+
+/**
+ * Used for XUL menupopup and panel.
+ */
+class XULMenupopupAccessible : public XULSelectControlAccessible
+{
+public:
+  XULMenupopupAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+
+  virtual Accessible* ContainerWidget() const override;
+
+protected:
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) override;
+};
+
+/**
+ * Used for XUL menubar element.
+ */
+class XULMenubarAccessible : public AccessibleWrap
+{
+public:
+  XULMenubarAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+
+  // Widget
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+  virtual Accessible* CurrentItem() override;
+  virtual void SetCurrentItem(Accessible* aItem) override;
+
+protected:
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) override;
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULSelectControlAccessible.cpp b/accessible/xul/XULSelectControlAccessible.cpp
new file mode 100644
index 000000000..a1cc65d78
--- /dev/null
+++ b/accessible/xul/XULSelectControlAccessible.cpp
@@ -0,0 +1,256 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "XULSelectControlAccessible.h"
+
+#include "nsAccessibilityService.h"
+#include "DocAccessible.h"
+
+#include "nsIDOMXULContainerElement.h"
+#include "nsIDOMXULSelectCntrlItemEl.h"
+#include "nsIDOMXULMultSelectCntrlEl.h"
+#include "nsIDOMKeyEvent.h"
+#include "nsIDOMElement.h"
+#include "nsIDOMXULElement.h"
+#include "nsIMutableArray.h"
+#include "nsIServiceManager.h"
+
+#include "mozilla/dom/Element.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULSelectControlAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULSelectControlAccessible::
+  XULSelectControlAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+  mGenericTypes |= eSelect;
+  mSelectControl = do_QueryInterface(aContent);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULSelectControlAccessible: Accessible
+
+void
+XULSelectControlAccessible::Shutdown()
+{
+  mSelectControl = nullptr;
+  AccessibleWrap::Shutdown();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULSelectControlAccessible: SelectAccessible
+
+void
+XULSelectControlAccessible::SelectedItems(nsTArray<Accessible*>* aItems)
+{
+  // For XUL multi-select control
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> xulMultiSelect =
+    do_QueryInterface(mSelectControl);
+  if (xulMultiSelect) {
+    int32_t length = 0;
+    xulMultiSelect->GetSelectedCount(&length);
+    for (int32_t index = 0; index < length; index++) {
+      nsCOMPtr<nsIDOMXULSelectControlItemElement> itemElm;
+      xulMultiSelect->MultiGetSelectedItem(index, getter_AddRefs(itemElm));
+      nsCOMPtr<nsINode> itemNode(do_QueryInterface(itemElm));
+      Accessible* item = mDoc->GetAccessible(itemNode);
+      if (item)
+        aItems->AppendElement(item);
+    }
+  } else {  // Single select?
+    nsCOMPtr<nsIDOMXULSelectControlItemElement> itemElm;
+    mSelectControl->GetSelectedItem(getter_AddRefs(itemElm));
+    nsCOMPtr<nsINode> itemNode(do_QueryInterface(itemElm));
+    if (itemNode) {
+      Accessible* item = mDoc->GetAccessible(itemNode);
+      if (item)
+        aItems->AppendElement(item);
+    }
+  }
+}
+
+Accessible*
+XULSelectControlAccessible::GetSelectedItem(uint32_t aIndex)
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+    do_QueryInterface(mSelectControl);
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> itemElm;
+  if (multiSelectControl)
+    multiSelectControl->MultiGetSelectedItem(aIndex, getter_AddRefs(itemElm));
+  else if (aIndex == 0)
+    mSelectControl->GetSelectedItem(getter_AddRefs(itemElm));
+
+  nsCOMPtr<nsINode> itemNode(do_QueryInterface(itemElm));
+  return itemNode && mDoc ? mDoc->GetAccessible(itemNode) : nullptr;
+}
+
+uint32_t
+XULSelectControlAccessible::SelectedItemCount()
+{
+  // For XUL multi-select control
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+    do_QueryInterface(mSelectControl);
+  if (multiSelectControl) {
+    int32_t count = 0;
+    multiSelectControl->GetSelectedCount(&count);
+    return count;
+  }
+
+  // For XUL single-select control/menulist
+  int32_t index;
+  mSelectControl->GetSelectedIndex(&index);
+  return (index >= 0) ? 1 : 0;
+}
+
+bool
+XULSelectControlAccessible::AddItemToSelection(uint32_t aIndex)
+{
+  Accessible* item = GetChildAt(aIndex);
+  if (!item)
+    return false;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> itemElm =
+    do_QueryInterface(item->GetContent());
+  if (!itemElm)
+    return false;
+
+  bool isItemSelected = false;
+  itemElm->GetSelected(&isItemSelected);
+  if (isItemSelected)
+    return true;
+
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+    do_QueryInterface(mSelectControl);
+
+  if (multiSelectControl)
+    multiSelectControl->AddItemToSelection(itemElm);
+  else
+    mSelectControl->SetSelectedItem(itemElm);
+
+  return true;
+}
+
+bool
+XULSelectControlAccessible::RemoveItemFromSelection(uint32_t aIndex)
+{
+  Accessible* item = GetChildAt(aIndex);
+  if (!item)
+    return false;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> itemElm =
+      do_QueryInterface(item->GetContent());
+  if (!itemElm)
+    return false;
+
+  bool isItemSelected = false;
+  itemElm->GetSelected(&isItemSelected);
+  if (!isItemSelected)
+    return true;
+
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+    do_QueryInterface(mSelectControl);
+
+  if (multiSelectControl)
+    multiSelectControl->RemoveItemFromSelection(itemElm);
+  else
+    mSelectControl->SetSelectedItem(nullptr);
+
+  return true;
+}
+
+bool
+XULSelectControlAccessible::IsItemSelected(uint32_t aIndex)
+{
+  Accessible* item = GetChildAt(aIndex);
+  if (!item)
+    return false;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> itemElm =
+    do_QueryInterface(item->GetContent());
+  if (!itemElm)
+    return false;
+
+  bool isItemSelected = false;
+  itemElm->GetSelected(&isItemSelected);
+  return isItemSelected;
+}
+
+bool
+XULSelectControlAccessible::UnselectAll()
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+    do_QueryInterface(mSelectControl);
+  multiSelectControl ?
+    multiSelectControl->ClearSelection() : mSelectControl->SetSelectedIndex(-1);
+
+  return true;
+}
+
+bool
+XULSelectControlAccessible::SelectAll()
+{
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+    do_QueryInterface(mSelectControl);
+  if (multiSelectControl) {
+    multiSelectControl->SelectAll();
+    return true;
+  }
+
+  // otherwise, don't support this method
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULSelectControlAccessible: Widgets
+
+Accessible*
+XULSelectControlAccessible::CurrentItem()
+{
+  if (!mSelectControl)
+    return nullptr;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> currentItemElm;
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+    do_QueryInterface(mSelectControl);
+  if (multiSelectControl)
+    multiSelectControl->GetCurrentItem(getter_AddRefs(currentItemElm));
+  else
+    mSelectControl->GetSelectedItem(getter_AddRefs(currentItemElm));
+
+  nsCOMPtr<nsINode> DOMNode;
+  if (currentItemElm)
+    DOMNode = do_QueryInterface(currentItemElm);
+
+  if (DOMNode) {
+    DocAccessible* document = Document();
+    if (document)
+      return document->GetAccessible(DOMNode);
+  }
+
+  return nullptr;
+}
+
+void
+XULSelectControlAccessible::SetCurrentItem(Accessible* aItem)
+{
+  if (!mSelectControl)
+    return;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> itemElm =
+    do_QueryInterface(aItem->GetContent());
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+    do_QueryInterface(mSelectControl);
+  if (multiSelectControl)
+    multiSelectControl->SetCurrentItem(itemElm);
+  else
+    mSelectControl->SetSelectedItem(itemElm);
+}
diff --git a/accessible/xul/XULSelectControlAccessible.h b/accessible/xul/XULSelectControlAccessible.h
new file mode 100644
index 000000000..c4886e26e
--- /dev/null
+++ b/accessible/xul/XULSelectControlAccessible.h
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef mozilla_a11y_XULSelectControlAccessible_h__
+#define mozilla_a11y_XULSelectControlAccessible_h__
+
+#include "AccessibleWrap.h"
+#include "nsIDOMXULSelectCntrlEl.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * The basic implementation of accessible selection for XUL select controls.
+ */
+class XULSelectControlAccessible : public AccessibleWrap
+{
+public:
+  XULSelectControlAccessible(nsIContent* aContent, DocAccessible* aDoc);
+  virtual ~XULSelectControlAccessible() {}
+
+  // Accessible
+  virtual void Shutdown() override;
+
+  // SelectAccessible
+  virtual void SelectedItems(nsTArray<Accessible*>* aItems) override;
+  virtual uint32_t SelectedItemCount() override;
+  virtual Accessible* GetSelectedItem(uint32_t aIndex) override;
+  virtual bool IsItemSelected(uint32_t aIndex) override;
+  virtual bool AddItemToSelection(uint32_t aIndex) override;
+  virtual bool RemoveItemFromSelection(uint32_t aIndex) override;
+  virtual bool SelectAll() override;
+  virtual bool UnselectAll() override;
+
+  // Widgets
+  virtual Accessible* CurrentItem() override;
+  virtual void SetCurrentItem(Accessible* aItem) override;
+
+protected:
+  // nsIDOMXULMultiSelectControlElement inherits from this, so we'll always have
+  // one of these if the widget is valid and not defunct
+  nsCOMPtr<nsIDOMXULSelectControlElement> mSelectControl;
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif
+
diff --git a/accessible/xul/XULSliderAccessible.cpp b/accessible/xul/XULSliderAccessible.cpp
new file mode 100644
index 000000000..476cb17eb
--- /dev/null
+++ b/accessible/xul/XULSliderAccessible.cpp
@@ -0,0 +1,214 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "XULSliderAccessible.h"
+
+#include "nsAccessibilityService.h"
+#include "Role.h"
+#include "States.h"
+
+#include "nsIFrame.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/FloatingPoint.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULSliderAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULSliderAccessible::
+  XULSliderAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+  mStateFlags |= eHasNumericValue | eNoXBLKids;
+}
+
+// Accessible
+
+role
+XULSliderAccessible::NativeRole()
+{
+  return roles::SLIDER;
+}
+
+uint64_t
+XULSliderAccessible::NativeInteractiveState() const
+ {
+  if (NativelyUnavailable())
+    return states::UNAVAILABLE;
+
+  nsIContent* sliderElm = GetSliderElement();
+  if (sliderElm) {
+    nsIFrame* frame = sliderElm->GetPrimaryFrame();
+    if (frame && frame->IsFocusable())
+      return states::FOCUSABLE;
+  }
+
+  return 0;
+}
+
+bool
+XULSliderAccessible::NativelyUnavailable() const
+{
+  return mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::disabled,
+                               nsGkAtoms::_true, eCaseMatters);
+}
+
+void
+XULSliderAccessible::Value(nsString& aValue)
+{
+  GetSliderAttr(nsGkAtoms::curpos, aValue);
+}
+
+uint8_t
+XULSliderAccessible::ActionCount()
+{
+  return 1;
+}
+
+void
+XULSliderAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  aName.Truncate();
+  if (aIndex == 0)
+    aName.AssignLiteral("activate");
+}
+
+bool
+XULSliderAccessible::DoAction(uint8_t aIndex)
+{
+  if (aIndex != 0)
+    return false;
+
+  nsIContent* sliderElm = GetSliderElement();
+  if (sliderElm)
+    DoCommand(sliderElm);
+
+  return true;
+}
+
+double
+XULSliderAccessible::MaxValue() const
+{
+  double value = AccessibleWrap::MaxValue();
+  return IsNaN(value) ? GetSliderAttr(nsGkAtoms::maxpos) : value;
+}
+
+double
+XULSliderAccessible::MinValue() const
+{
+  double value = AccessibleWrap::MinValue();
+  return IsNaN(value) ? GetSliderAttr(nsGkAtoms::minpos) : value;
+}
+
+double
+XULSliderAccessible::Step() const
+{
+  double value = AccessibleWrap::Step();
+  return IsNaN(value) ? GetSliderAttr(nsGkAtoms::increment) : value;
+}
+
+double
+XULSliderAccessible::CurValue() const
+{
+  double value = AccessibleWrap::CurValue();
+  return IsNaN(value) ? GetSliderAttr(nsGkAtoms::curpos) : value;
+}
+
+bool
+XULSliderAccessible::SetCurValue(double aValue)
+{
+  if (AccessibleWrap::SetCurValue(aValue))
+    return true;
+
+  return SetSliderAttr(nsGkAtoms::curpos, aValue);
+}
+
+// Utils
+
+nsIContent*
+XULSliderAccessible::GetSliderElement() const
+{
+  if (!mSliderNode) {
+    // XXX: we depend on anonymous content.
+    mSliderNode = mContent->OwnerDoc()->
+      GetAnonymousElementByAttribute(mContent, nsGkAtoms::anonid,
+                                     NS_LITERAL_STRING("slider"));
+  }
+
+  return mSliderNode;
+}
+
+nsresult
+XULSliderAccessible::GetSliderAttr(nsIAtom* aName, nsAString& aValue) const
+{
+  aValue.Truncate();
+
+  if (IsDefunct())
+    return NS_ERROR_FAILURE;
+
+  nsIContent* sliderElm = GetSliderElement();
+  if (sliderElm)
+    sliderElm->GetAttr(kNameSpaceID_None, aName, aValue);
+
+  return NS_OK;
+}
+
+nsresult
+XULSliderAccessible::SetSliderAttr(nsIAtom* aName, const nsAString& aValue)
+{
+  if (IsDefunct())
+    return NS_ERROR_FAILURE;
+
+  nsIContent* sliderElm = GetSliderElement();
+  if (sliderElm)
+    sliderElm->SetAttr(kNameSpaceID_None, aName, aValue, true);
+
+  return NS_OK;
+}
+
+double
+XULSliderAccessible::GetSliderAttr(nsIAtom* aName) const
+{
+  nsAutoString attrValue;
+  nsresult rv = GetSliderAttr(aName, attrValue);
+  if (NS_FAILED(rv))
+    return UnspecifiedNaN<double>();
+
+  nsresult error = NS_OK;
+  double value = attrValue.ToDouble(&error);
+  return NS_FAILED(error) ? UnspecifiedNaN<double>() : value;
+}
+
+bool
+XULSliderAccessible::SetSliderAttr(nsIAtom* aName, double aValue)
+{
+  nsAutoString value;
+  value.AppendFloat(aValue);
+
+  return NS_SUCCEEDED(SetSliderAttr(aName, value));
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULThumbAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULThumbAccessible::
+  XULThumbAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULThumbAccessible: Accessible
+
+role
+XULThumbAccessible::NativeRole()
+{
+  return roles::INDICATOR;
+}
+
diff --git a/accessible/xul/XULSliderAccessible.h b/accessible/xul/XULSliderAccessible.h
new file mode 100644
index 000000000..72c914c26
--- /dev/null
+++ b/accessible/xul/XULSliderAccessible.h
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_XULSliderAccessible_h__
+#define mozilla_a11y_XULSliderAccessible_h__
+
+#include "AccessibleWrap.h"
+
+#include "nsIDOMElement.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * Used for XUL slider and scale elements.
+ */
+class XULSliderAccessible : public AccessibleWrap
+{
+public:
+  XULSliderAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual void Value(nsString& aValue) override;
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeInteractiveState() const override;
+  virtual bool NativelyUnavailable() const override;
+
+  // Value
+  virtual double MaxValue() const override;
+  virtual double MinValue() const override;
+  virtual double CurValue() const override;
+  virtual double Step() const override;
+  virtual bool SetCurValue(double aValue) override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+
+protected:
+  /**
+   * Return anonymous slider element.
+   */
+  nsIContent* GetSliderElement() const;
+
+  nsresult GetSliderAttr(nsIAtom *aName, nsAString& aValue) const;
+  nsresult SetSliderAttr(nsIAtom *aName, const nsAString& aValue);
+
+  double GetSliderAttr(nsIAtom *aName) const;
+  bool SetSliderAttr(nsIAtom *aName, double aValue);
+
+private:
+  mutable nsCOMPtr<nsIContent> mSliderNode;
+};
+
+
+/**
+ * Used for slider's thumb element.
+ */
+class XULThumbAccessible : public AccessibleWrap
+{
+public:
+  XULThumbAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif
+
diff --git a/accessible/xul/XULTabAccessible.cpp b/accessible/xul/XULTabAccessible.cpp
new file mode 100644
index 000000000..e525cf36d
--- /dev/null
+++ b/accessible/xul/XULTabAccessible.cpp
@@ -0,0 +1,209 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "XULTabAccessible.h"
+
+#include "nsAccUtils.h"
+#include "Relation.h"
+#include "Role.h"
+#include "States.h"
+
+// NOTE: alphabetically ordered
+#include "nsIDocument.h"
+#include "nsIDOMXULSelectCntrlEl.h"
+#include "nsIDOMXULSelectCntrlItemEl.h"
+#include "nsIDOMXULRelatedElement.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTabAccessible::
+  XULTabAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabAccessible: Accessible
+
+uint8_t
+XULTabAccessible::ActionCount()
+{
+  return 1;
+}
+
+void
+XULTabAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  if (aIndex == eAction_Switch)
+    aName.AssignLiteral("switch");
+}
+
+bool
+XULTabAccessible::DoAction(uint8_t index)
+{
+  if (index == eAction_Switch) {
+    nsCOMPtr<nsIDOMXULElement> tab(do_QueryInterface(mContent));
+    if (tab) {
+      tab->Click();
+      return true;
+    }
+  }
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabAccessible: Accessible
+
+role
+XULTabAccessible::NativeRole()
+{
+  return roles::PAGETAB;
+}
+
+uint64_t
+XULTabAccessible::NativeState()
+{
+  // Possible states: focused, focusable, unavailable(disabled), offscreen.
+
+  // get focus and disable status from base class
+  uint64_t state = AccessibleWrap::NativeState();
+
+  // Check whether the tab is selected and/or pinned
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> tab(do_QueryInterface(mContent));
+  if (tab) {
+    bool selected = false;
+    if (NS_SUCCEEDED(tab->GetSelected(&selected)) && selected)
+      state |= states::SELECTED;
+
+    if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::pinned,
+                              nsGkAtoms::_true, eCaseMatters))
+      state |= states::PINNED;
+
+  }
+
+  return state;
+}
+
+uint64_t
+XULTabAccessible::NativeInteractiveState() const
+{
+  uint64_t state = Accessible::NativeInteractiveState();
+  return (state & states::UNAVAILABLE) ? state : state | states::SELECTABLE;
+}
+
+Relation
+XULTabAccessible::RelationByType(RelationType aType)
+{
+  Relation rel = AccessibleWrap::RelationByType(aType);
+  if (aType != RelationType::LABEL_FOR)
+    return rel;
+
+  // Expose 'LABEL_FOR' relation on tab accessible for tabpanel accessible.
+  nsCOMPtr<nsIDOMXULRelatedElement> tabsElm =
+    do_QueryInterface(mContent->GetParent());
+  if (!tabsElm)
+    return rel;
+
+  nsCOMPtr<nsIDOMNode> domNode(DOMNode());
+  nsCOMPtr<nsIDOMNode> tabpanelNode;
+  tabsElm->GetRelatedElement(domNode, getter_AddRefs(tabpanelNode));
+  if (!tabpanelNode)
+    return rel;
+
+  nsCOMPtr<nsIContent> tabpanelContent(do_QueryInterface(tabpanelNode));
+  rel.AppendTarget(mDoc, tabpanelContent);
+  return rel;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabsAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTabsAccessible::
+  XULTabsAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  XULSelectControlAccessible(aContent, aDoc)
+{
+}
+
+role
+XULTabsAccessible::NativeRole()
+{
+  return roles::PAGETABLIST;
+}
+
+uint8_t
+XULTabsAccessible::ActionCount()
+{
+  return 0;
+}
+
+void
+XULTabsAccessible::Value(nsString& aValue)
+{
+  aValue.Truncate();
+}
+
+ENameValueFlag
+XULTabsAccessible::NativeName(nsString& aName)
+{
+  // no name
+  return eNameOK;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabpanelsAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+role
+XULTabpanelsAccessible::NativeRole()
+{
+  return roles::PANE;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabpanelAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTabpanelAccessible::
+  XULTabpanelAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  AccessibleWrap(aContent, aDoc)
+{
+}
+
+role
+XULTabpanelAccessible::NativeRole()
+{
+  return roles::PROPERTYPAGE;
+}
+
+Relation
+XULTabpanelAccessible::RelationByType(RelationType aType)
+{
+  Relation rel = AccessibleWrap::RelationByType(aType);
+  if (aType != RelationType::LABELLED_BY)
+    return rel;
+
+  // Expose 'LABELLED_BY' relation on tabpanel accessible for tab accessible.
+  nsCOMPtr<nsIDOMXULRelatedElement> tabpanelsElm =
+    do_QueryInterface(mContent->GetParent());
+  if (!tabpanelsElm)
+    return rel;
+
+  nsCOMPtr<nsIDOMNode> domNode(DOMNode());
+  nsCOMPtr<nsIDOMNode> tabNode;
+  tabpanelsElm->GetRelatedElement(domNode, getter_AddRefs(tabNode));
+  if (!tabNode)
+    return rel;
+
+  nsCOMPtr<nsIContent> tabContent(do_QueryInterface(tabNode));
+  rel.AppendTarget(mDoc, tabContent);
+  return rel;
+}
diff --git a/accessible/xul/XULTabAccessible.h b/accessible/xul/XULTabAccessible.h
new file mode 100644
index 000000000..0c10c0679
--- /dev/null
+++ b/accessible/xul/XULTabAccessible.h
@@ -0,0 +1,96 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_XULTabAccessible_h__
+#define mozilla_a11y_XULTabAccessible_h__
+
+// NOTE: alphabetically ordered
+#include "XULMenuAccessible.h"
+#include "XULSelectControlAccessible.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * An individual tab, xul:tab element.
+ */
+class XULTabAccessible : public AccessibleWrap
+{
+public:
+  enum { eAction_Switch = 0 };
+
+  XULTabAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+  virtual uint64_t NativeInteractiveState() const override;
+  virtual Relation RelationByType(RelationType aType) override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+};
+
+
+/**
+ * A container of tab objects, xul:tabs element.
+ */
+class XULTabsAccessible : public XULSelectControlAccessible
+{
+public:
+  XULTabsAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual void Value(nsString& aValue) override;
+  virtual a11y::role NativeRole() override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+
+protected:
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) override;
+};
+
+
+/**
+ * A container of tab panels, xul:tabpanels element.
+ */
+class XULTabpanelsAccessible : public AccessibleWrap
+{
+public:
+  XULTabpanelsAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+    AccessibleWrap(aContent, aDoc)
+    { mType = eXULTabpanelsType; }
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+};
+
+
+/**
+ * A tabpanel object, child elements of xul:tabpanels element.
+ *
+ * XXX: we need to move the class logic into generic class since
+ * for example we do not create instance of this class for XUL textbox used as
+ * a tabpanel.
+ */
+class XULTabpanelAccessible : public AccessibleWrap
+{
+public:
+  XULTabpanelAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Accessible
+  virtual a11y::role NativeRole() override;
+  virtual Relation RelationByType(RelationType aType) override;
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif
+
diff --git a/accessible/xul/XULTreeAccessible.cpp b/accessible/xul/XULTreeAccessible.cpp
new file mode 100644
index 000000000..88153dc2d
--- /dev/null
+++ b/accessible/xul/XULTreeAccessible.cpp
@@ -0,0 +1,1184 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "XULTreeAccessible.h"
+
+#include "Accessible-inl.h"
+#include "DocAccessible-inl.h"
+#include "nsAccCache.h"
+#include "nsAccUtils.h"
+#include "nsCoreUtils.h"
+#include "nsEventShell.h"
+#include "DocAccessible.h"
+#include "Relation.h"
+#include "Role.h"
+#include "States.h"
+#include "XULTreeGridAccessible.h"
+#include "nsQueryObject.h"
+
+#include "nsComponentManagerUtils.h"
+#include "nsIAccessibleRelation.h"
+#include "nsIAutoCompleteInput.h"
+#include "nsIAutoCompletePopup.h"
+#include "nsIBoxObject.h"
+#include "nsIDOMXULElement.h"
+#include "nsIDOMXULMenuListElement.h"
+#include "nsIDOMXULMultSelectCntrlEl.h"
+#include "nsIDOMXULTreeElement.h"
+#include "nsITreeSelection.h"
+#include "nsIMutableArray.h"
+#include "nsTreeBodyFrame.h"
+#include "nsTreeColumns.h"
+#include "nsTreeUtils.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTreeAccessible::
+  XULTreeAccessible(nsIContent* aContent, DocAccessible* aDoc,
+                    nsTreeBodyFrame* aTreeFrame) :
+  AccessibleWrap(aContent, aDoc),
+  mAccessibleCache(kDefaultTreeCacheLength)
+{
+  mType = eXULTreeType;
+  mGenericTypes |= eSelect;
+
+  nsCOMPtr<nsITreeView> view = aTreeFrame->GetExistingView();
+  mTreeView = view;
+
+  mTree = nsCoreUtils::GetTreeBoxObject(aContent);
+  NS_ASSERTION(mTree, "Can't get mTree!\n");
+
+  nsIContent* parentContent = mContent->GetParent();
+  if (parentContent) {
+    nsCOMPtr<nsIAutoCompletePopup> autoCompletePopupElm =
+      do_QueryInterface(parentContent);
+    if (autoCompletePopupElm)
+      mGenericTypes |= eAutoCompletePopup;
+  }
+}
+
+XULTreeAccessible::~XULTreeAccessible()
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: nsISupports and cycle collection implementation
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(XULTreeAccessible, Accessible,
+                                   mTree, mAccessibleCache)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(XULTreeAccessible)
+NS_INTERFACE_MAP_END_INHERITING(Accessible)
+
+NS_IMPL_ADDREF_INHERITED(XULTreeAccessible, Accessible)
+NS_IMPL_RELEASE_INHERITED(XULTreeAccessible, Accessible)
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: Accessible implementation
+
+uint64_t
+XULTreeAccessible::NativeState()
+{
+  // Get focus status from base class.
+  uint64_t state = Accessible::NativeState();
+
+  // readonly state
+  state |= states::READONLY;
+
+  // multiselectable state.
+  if (!mTreeView)
+    return state;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  NS_ENSURE_TRUE(selection, state);
+
+  bool isSingle = false;
+  nsresult rv = selection->GetSingle(&isSingle);
+  NS_ENSURE_SUCCESS(rv, state);
+
+  if (!isSingle)
+    state |= states::MULTISELECTABLE;
+
+  return state;
+}
+
+void
+XULTreeAccessible::Value(nsString& aValue)
+{
+  aValue.Truncate();
+  if (!mTreeView)
+    return;
+
+  // Return the value is the first selected child.
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (!selection)
+    return;
+
+  int32_t currentIndex;
+  selection->GetCurrentIndex(&currentIndex);
+  if (currentIndex >= 0) {
+    nsCOMPtr<nsITreeColumn> keyCol;
+
+    nsCOMPtr<nsITreeColumns> cols;
+    mTree->GetColumns(getter_AddRefs(cols));
+    if (cols)
+      cols->GetKeyColumn(getter_AddRefs(keyCol));
+
+    mTreeView->GetCellText(currentIndex, keyCol, aValue);
+  }
+
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: Accessible implementation
+
+void
+XULTreeAccessible::Shutdown()
+{
+  if (mDoc && !mDoc->IsDefunct()) {
+    UnbindCacheEntriesFromDocument(mAccessibleCache);
+  }
+
+  mTree = nullptr;
+  mTreeView = nullptr;
+
+  AccessibleWrap::Shutdown();
+}
+
+role
+XULTreeAccessible::NativeRole()
+{
+  // No primary column means we're in a list. In fact, history and mail turn off
+  // the primary flag when switching to a flat view.
+
+  nsIContent* child = nsTreeUtils::GetDescendantChild(mContent, nsGkAtoms::treechildren);
+  NS_ASSERTION(child, "tree without treechildren!");
+  nsTreeBodyFrame* treeFrame = do_QueryFrame(child->GetPrimaryFrame());
+  NS_ASSERTION(treeFrame, "xul tree accessible for tree without a frame!");
+  if (!treeFrame)
+    return roles::LIST;
+
+  RefPtr<nsTreeColumns> cols = treeFrame->Columns();
+  nsCOMPtr<nsITreeColumn> primaryCol;
+  cols->GetPrimaryColumn(getter_AddRefs(primaryCol));
+
+  return primaryCol ? roles::OUTLINE : roles::LIST;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: Accessible implementation (DON'T put methods here)
+
+Accessible*
+XULTreeAccessible::ChildAtPoint(int32_t aX, int32_t aY,
+                                EWhichChildAtPoint aWhichChild)
+{
+  nsIFrame *frame = GetFrame();
+  if (!frame)
+    return nullptr;
+
+  nsPresContext *presContext = frame->PresContext();
+  nsIPresShell* presShell = presContext->PresShell();
+
+  nsIFrame *rootFrame = presShell->GetRootFrame();
+  NS_ENSURE_TRUE(rootFrame, nullptr);
+
+  nsIntRect rootRect = rootFrame->GetScreenRect();
+
+  int32_t clientX = presContext->DevPixelsToIntCSSPixels(aX) - rootRect.x;
+  int32_t clientY = presContext->DevPixelsToIntCSSPixels(aY) - rootRect.y;
+
+  int32_t row = -1;
+  nsCOMPtr<nsITreeColumn> column;
+  nsAutoString childEltUnused;
+  mTree->GetCellAt(clientX, clientY, &row, getter_AddRefs(column),
+                   childEltUnused);
+
+  // If we failed to find tree cell for the given point then it might be
+  // tree columns.
+  if (row == -1 || !column)
+    return AccessibleWrap::ChildAtPoint(aX, aY, aWhichChild);
+
+  Accessible* child = GetTreeItemAccessible(row);
+  if (aWhichChild == eDeepestChild && child) {
+    // Look for accessible cell for the found item accessible.
+    RefPtr<XULTreeItemAccessibleBase> treeitem = do_QueryObject(child);
+
+    Accessible* cell = treeitem->GetCellAccessible(column);
+    if (cell)
+      child = cell;
+  }
+
+  return child;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: SelectAccessible
+
+Accessible*
+XULTreeAccessible::CurrentItem()
+{
+  if (!mTreeView)
+    return nullptr;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (selection) {
+    int32_t currentIndex = -1;
+    selection->GetCurrentIndex(&currentIndex);
+    if (currentIndex >= 0)
+      return GetTreeItemAccessible(currentIndex);
+  }
+
+  return nullptr;
+}
+
+void
+XULTreeAccessible::SetCurrentItem(Accessible* aItem)
+{
+  NS_ERROR("XULTreeAccessible::SetCurrentItem not implemented");
+}
+
+void
+XULTreeAccessible::SelectedItems(nsTArray<Accessible*>* aItems)
+{
+  if (!mTreeView)
+    return;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (!selection)
+    return;
+
+  int32_t rangeCount = 0;
+  selection->GetRangeCount(&rangeCount);
+  for (int32_t rangeIdx = 0; rangeIdx < rangeCount; rangeIdx++) {
+    int32_t firstIdx = 0, lastIdx = -1;
+    selection->GetRangeAt(rangeIdx, &firstIdx, &lastIdx);
+    for (int32_t rowIdx = firstIdx; rowIdx <= lastIdx; rowIdx++) {
+      Accessible* item = GetTreeItemAccessible(rowIdx);
+      if (item)
+        aItems->AppendElement(item);
+    }
+  }
+}
+
+uint32_t
+XULTreeAccessible::SelectedItemCount()
+{
+  if (!mTreeView)
+    return 0;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (selection) {
+    int32_t count = 0;
+    selection->GetCount(&count);
+    return count;
+  }
+
+  return 0;
+}
+
+bool
+XULTreeAccessible::AddItemToSelection(uint32_t aIndex)
+{
+  if (!mTreeView)
+    return false;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (selection) {
+    bool isSelected = false;
+    selection->IsSelected(aIndex, &isSelected);
+    if (!isSelected)
+      selection->ToggleSelect(aIndex);
+
+    return true;
+  }
+  return false;
+}
+
+bool
+XULTreeAccessible::RemoveItemFromSelection(uint32_t aIndex)
+{
+  if (!mTreeView)
+    return false;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (selection) {
+    bool isSelected = false;
+    selection->IsSelected(aIndex, &isSelected);
+    if (isSelected)
+      selection->ToggleSelect(aIndex);
+
+    return true;
+  }
+  return false;
+}
+
+bool
+XULTreeAccessible::IsItemSelected(uint32_t aIndex)
+{
+  if (!mTreeView)
+    return false;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (selection) {
+    bool isSelected = false;
+    selection->IsSelected(aIndex, &isSelected);
+    return isSelected;
+  }
+  return false;
+}
+
+bool
+XULTreeAccessible::UnselectAll()
+{
+  if (!mTreeView)
+    return false;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (!selection)
+    return false;
+
+  selection->ClearSelection();
+  return true;
+}
+
+Accessible*
+XULTreeAccessible::GetSelectedItem(uint32_t aIndex)
+{
+  if (!mTreeView)
+    return nullptr;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (!selection)
+    return nullptr;
+
+  uint32_t selCount = 0;
+  int32_t rangeCount = 0;
+  selection->GetRangeCount(&rangeCount);
+  for (int32_t rangeIdx = 0; rangeIdx < rangeCount; rangeIdx++) {
+    int32_t firstIdx = 0, lastIdx = -1;
+    selection->GetRangeAt(rangeIdx, &firstIdx, &lastIdx);
+    for (int32_t rowIdx = firstIdx; rowIdx <= lastIdx; rowIdx++) {
+      if (selCount == aIndex)
+        return GetTreeItemAccessible(rowIdx);
+
+      selCount++;
+    }
+  }
+
+  return nullptr;
+}
+
+bool
+XULTreeAccessible::SelectAll()
+{
+  // see if we are multiple select if so set ourselves as such
+  if (!mTreeView)
+    return false;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (selection) {
+    bool single = false;
+    selection->GetSingle(&single);
+    if (!single) {
+      selection->SelectAll();
+      return true;
+    }
+  }
+
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: Accessible implementation
+
+Accessible*
+XULTreeAccessible::GetChildAt(uint32_t aIndex) const
+{
+  uint32_t childCount = Accessible::ChildCount();
+  if (aIndex < childCount)
+    return Accessible::GetChildAt(aIndex);
+
+  return GetTreeItemAccessible(aIndex - childCount);
+}
+
+uint32_t
+XULTreeAccessible::ChildCount() const
+{
+  // Tree's children count is row count + treecols count.
+  uint32_t childCount = Accessible::ChildCount();
+  if (!mTreeView)
+    return childCount;
+
+  int32_t rowCount = 0;
+  mTreeView->GetRowCount(&rowCount);
+  childCount += rowCount;
+
+  return childCount;
+}
+
+Relation
+XULTreeAccessible::RelationByType(RelationType aType)
+{
+  if (aType == RelationType::NODE_PARENT_OF) {
+    if (mTreeView)
+      return Relation(new XULTreeItemIterator(this, mTreeView, -1));
+
+    return Relation();
+  }
+
+  return Accessible::RelationByType(aType);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: Widgets
+
+bool
+XULTreeAccessible::IsWidget() const
+{
+  return true;
+}
+
+bool
+XULTreeAccessible::IsActiveWidget() const
+{
+  if (IsAutoCompletePopup()) {
+    nsCOMPtr<nsIAutoCompletePopup> autoCompletePopupElm =
+      do_QueryInterface(mContent->GetParent());
+
+    if (autoCompletePopupElm) {
+      bool isOpen = false;
+      autoCompletePopupElm->GetPopupOpen(&isOpen);
+      return isOpen;
+    }
+  }
+  return FocusMgr()->HasDOMFocus(mContent);
+}
+
+bool
+XULTreeAccessible::AreItemsOperable() const
+{
+  if (IsAutoCompletePopup()) {
+    nsCOMPtr<nsIAutoCompletePopup> autoCompletePopupElm =
+      do_QueryInterface(mContent->GetParent());
+
+    if (autoCompletePopupElm) {
+      bool isOpen = false;
+      autoCompletePopupElm->GetPopupOpen(&isOpen);
+      return isOpen;
+    }
+  }
+  return true;
+}
+
+Accessible*
+XULTreeAccessible::ContainerWidget() const
+{
+  if (IsAutoCompletePopup()) {
+    // This works for XUL autocompletes. It doesn't work for HTML forms
+    // autocomplete because of potential crossprocess calls (when autocomplete
+    // lives in content process while popup lives in chrome process). If that's
+    // a problem then rethink Widgets interface.
+    nsCOMPtr<nsIDOMXULMenuListElement> menuListElm =
+      do_QueryInterface(mContent->GetParent());
+    if (menuListElm) {
+      nsCOMPtr<nsIDOMNode> inputElm;
+      menuListElm->GetInputField(getter_AddRefs(inputElm));
+      if (inputElm) {
+        nsCOMPtr<nsINode> inputNode = do_QueryInterface(inputElm);
+        if (inputNode) {
+          Accessible* input = 
+            mDoc->GetAccessible(inputNode);
+          return input ? input->ContainerWidget() : nullptr;
+        }
+      }
+    }
+  }
+  return nullptr;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: public implementation
+
+Accessible*
+XULTreeAccessible::GetTreeItemAccessible(int32_t aRow) const
+{
+  if (aRow < 0 || IsDefunct() || !mTreeView)
+    return nullptr;
+
+  int32_t rowCount = 0;
+  nsresult rv = mTreeView->GetRowCount(&rowCount);
+  if (NS_FAILED(rv) || aRow >= rowCount)
+    return nullptr;
+
+  void *key = reinterpret_cast<void*>(intptr_t(aRow));
+  Accessible* cachedTreeItem = mAccessibleCache.GetWeak(key);
+  if (cachedTreeItem)
+    return cachedTreeItem;
+
+  RefPtr<Accessible> treeItem = CreateTreeItemAccessible(aRow);
+  if (treeItem) {
+    mAccessibleCache.Put(key, treeItem);
+    Document()->BindToDocument(treeItem, nullptr);
+    return treeItem;
+  }
+
+  return nullptr;
+}
+
+void
+XULTreeAccessible::InvalidateCache(int32_t aRow, int32_t aCount)
+{
+  if (IsDefunct())
+    return;
+
+  if (!mTreeView) {
+    UnbindCacheEntriesFromDocument(mAccessibleCache);
+    return;
+  }
+
+  // Do not invalidate the cache if rows have been inserted.
+  if (aCount > 0)
+    return;
+
+  DocAccessible* document = Document();
+
+  // Fire destroy event for removed tree items and delete them from caches.
+  for (int32_t rowIdx = aRow; rowIdx < aRow - aCount; rowIdx++) {
+
+    void* key = reinterpret_cast<void*>(intptr_t(rowIdx));
+    Accessible* treeItem = mAccessibleCache.GetWeak(key);
+
+    if (treeItem) {
+      RefPtr<AccEvent> event =
+        new AccEvent(nsIAccessibleEvent::EVENT_HIDE, treeItem);
+      nsEventShell::FireEvent(event);
+
+      // Unbind from document, shutdown and remove from tree cache.
+      document->UnbindFromDocument(treeItem);
+      mAccessibleCache.Remove(key);
+    }
+  }
+
+  // We dealt with removed tree items already however we may keep tree items
+  // having row indexes greater than row count. We should remove these dead tree
+  // items silently from caches.
+  int32_t newRowCount = 0;
+  nsresult rv = mTreeView->GetRowCount(&newRowCount);
+  if (NS_FAILED(rv))
+    return;
+
+  int32_t oldRowCount = newRowCount - aCount;
+
+  for (int32_t rowIdx = newRowCount; rowIdx < oldRowCount; ++rowIdx) {
+
+    void *key = reinterpret_cast<void*>(intptr_t(rowIdx));
+    Accessible* treeItem = mAccessibleCache.GetWeak(key);
+
+    if (treeItem) {
+      // Unbind from document, shutdown and remove from tree cache.
+      document->UnbindFromDocument(treeItem);
+      mAccessibleCache.Remove(key);
+    }
+  }
+}
+
+void
+XULTreeAccessible::TreeViewInvalidated(int32_t aStartRow, int32_t aEndRow,
+                                       int32_t aStartCol, int32_t aEndCol)
+{
+  if (IsDefunct())
+    return;
+
+  if (!mTreeView) {
+    UnbindCacheEntriesFromDocument(mAccessibleCache);
+    return;
+  }
+
+  int32_t endRow = aEndRow;
+
+  nsresult rv;
+  if (endRow == -1) {
+    int32_t rowCount = 0;
+    rv = mTreeView->GetRowCount(&rowCount);
+    if (NS_FAILED(rv))
+      return;
+
+    endRow = rowCount - 1;
+  }
+
+  nsCOMPtr<nsITreeColumns> treeColumns;
+  mTree->GetColumns(getter_AddRefs(treeColumns));
+  if (!treeColumns)
+    return;
+
+  int32_t endCol = aEndCol;
+
+  if (endCol == -1) {
+    int32_t colCount = 0;
+    rv = treeColumns->GetCount(&colCount);
+    if (NS_FAILED(rv))
+      return;
+
+    endCol = colCount - 1;
+  }
+
+  for (int32_t rowIdx = aStartRow; rowIdx <= endRow; ++rowIdx) {
+
+    void *key = reinterpret_cast<void*>(intptr_t(rowIdx));
+    Accessible* accessible = mAccessibleCache.GetWeak(key);
+
+    if (accessible) {
+      RefPtr<XULTreeItemAccessibleBase> treeitemAcc = do_QueryObject(accessible);
+      NS_ASSERTION(treeitemAcc, "Wrong accessible at the given key!");
+
+      treeitemAcc->RowInvalidated(aStartCol, endCol);
+    }
+  }
+}
+
+void
+XULTreeAccessible::TreeViewChanged(nsITreeView* aView)
+{
+  if (IsDefunct())
+    return;
+
+  // Fire reorder event on tree accessible on accessible tree (do not fire
+  // show/hide events on tree items because it can be expensive to fire them for
+  // each tree item.
+  RefPtr<AccReorderEvent> reorderEvent = new AccReorderEvent(this);
+  Document()->FireDelayedEvent(reorderEvent);
+
+  // Clear cache.
+  UnbindCacheEntriesFromDocument(mAccessibleCache);
+
+  mTreeView = aView;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: protected implementation
+
+already_AddRefed<Accessible>
+XULTreeAccessible::CreateTreeItemAccessible(int32_t aRow) const
+{
+  RefPtr<Accessible> accessible =
+    new XULTreeItemAccessible(mContent, mDoc, const_cast<XULTreeAccessible*>(this),
+                              mTree, mTreeView, aRow);
+
+  return accessible.forget();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase
+////////////////////////////////////////////////////////////////////////////////
+
+XULTreeItemAccessibleBase::
+  XULTreeItemAccessibleBase(nsIContent* aContent, DocAccessible* aDoc,
+                            Accessible* aParent, nsITreeBoxObject* aTree,
+                            nsITreeView* aTreeView, int32_t aRow) :
+  AccessibleWrap(aContent, aDoc),
+  mTree(aTree), mTreeView(aTreeView), mRow(aRow)
+{
+  mParent = aParent;
+  mStateFlags |= eSharedNode;
+}
+
+XULTreeItemAccessibleBase::~XULTreeItemAccessibleBase()
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase: nsISupports implementation
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(XULTreeItemAccessibleBase, Accessible,
+                                   mTree)
+
+NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(XULTreeItemAccessibleBase)
+  NS_INTERFACE_TABLE_INHERITED(XULTreeItemAccessibleBase,
+                               XULTreeItemAccessibleBase)
+NS_INTERFACE_TABLE_TAIL_INHERITING(Accessible)
+NS_IMPL_ADDREF_INHERITED(XULTreeItemAccessibleBase, Accessible)
+NS_IMPL_RELEASE_INHERITED(XULTreeItemAccessibleBase, Accessible)
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase: Accessible
+
+Accessible*
+XULTreeItemAccessibleBase::FocusedChild()
+{
+  return FocusMgr()->FocusedAccessible() == this ? this : nullptr;
+}
+
+nsIntRect
+XULTreeItemAccessibleBase::Bounds() const
+{
+  // Get x coordinate and width from treechildren element, get y coordinate and
+  // height from tree cell.
+
+  nsCOMPtr<nsIBoxObject> boxObj = nsCoreUtils::GetTreeBodyBoxObject(mTree);
+  if (!boxObj)
+    return nsIntRect();
+
+  nsCOMPtr<nsITreeColumn> column = nsCoreUtils::GetFirstSensibleColumn(mTree);
+
+  int32_t x = 0, y = 0, width = 0, height = 0;
+  nsresult rv = mTree->GetCoordsForCellItem(mRow, column, EmptyString(),
+                                            &x, &y, &width, &height);
+  if (NS_FAILED(rv))
+    return nsIntRect();
+
+  boxObj->GetWidth(&width);
+
+  int32_t tcX = 0, tcY = 0;
+  boxObj->GetScreenX(&tcX);
+  boxObj->GetScreenY(&tcY);
+
+  x = tcX;
+  y += tcY;
+
+  nsPresContext* presContext = mDoc->PresContext();
+  return nsIntRect(presContext->CSSPixelsToDevPixels(x),
+                   presContext->CSSPixelsToDevPixels(y),
+                   presContext->CSSPixelsToDevPixels(width),
+                   presContext->CSSPixelsToDevPixels(height));
+}
+
+void
+XULTreeItemAccessibleBase::SetSelected(bool aSelect)
+{
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (selection) {
+    bool isSelected = false;
+    selection->IsSelected(mRow, &isSelected);
+    if (isSelected != aSelect)
+      selection->ToggleSelect(mRow);
+  }
+}
+
+void
+XULTreeItemAccessibleBase::TakeFocus()
+{
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (selection)
+    selection->SetCurrentIndex(mRow);
+
+  // focus event will be fired here
+  Accessible::TakeFocus();
+}
+
+Relation
+XULTreeItemAccessibleBase::RelationByType(RelationType aType)
+{
+
+  switch (aType) {
+    case RelationType::NODE_CHILD_OF: {
+      int32_t parentIndex = -1;
+      if (!NS_SUCCEEDED(mTreeView->GetParentIndex(mRow, &parentIndex)))
+        return Relation();
+
+      if (parentIndex == -1)
+        return Relation(mParent);
+
+      XULTreeAccessible* treeAcc = mParent->AsXULTree();
+      return Relation(treeAcc->GetTreeItemAccessible(parentIndex));
+    }
+
+    case RelationType::NODE_PARENT_OF: {
+      bool isTrue = false;
+      if (NS_FAILED(mTreeView->IsContainerEmpty(mRow, &isTrue)) || isTrue)
+        return Relation();
+
+      if (NS_FAILED(mTreeView->IsContainerOpen(mRow, &isTrue)) || !isTrue)
+        return Relation();
+
+      XULTreeAccessible* tree = mParent->AsXULTree();
+      return Relation(new XULTreeItemIterator(tree, mTreeView, mRow));
+    }
+
+    default:
+      return Relation();
+  }
+}
+
+uint8_t
+XULTreeItemAccessibleBase::ActionCount()
+{
+  // "activate" action is available for all treeitems, "expand/collapse" action
+  // is avaible for treeitem which is container.
+  return IsExpandable() ? 2 : 1;
+}
+
+void
+XULTreeItemAccessibleBase::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  if (aIndex == eAction_Click) {
+    aName.AssignLiteral("activate");
+    return;
+  }
+
+  if (aIndex == eAction_Expand && IsExpandable()) {
+    bool isContainerOpen = false;
+    mTreeView->IsContainerOpen(mRow, &isContainerOpen);
+    if (isContainerOpen)
+      aName.AssignLiteral("collapse");
+    else
+      aName.AssignLiteral("expand");
+  }
+}
+
+bool
+XULTreeItemAccessibleBase::DoAction(uint8_t aIndex)
+{
+  if (aIndex != eAction_Click &&
+      (aIndex != eAction_Expand || !IsExpandable()))
+    return false;
+
+  DoCommand(nullptr, aIndex);
+  return true;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase: Accessible implementation
+
+void
+XULTreeItemAccessibleBase::Shutdown()
+{
+  mTree = nullptr;
+  mTreeView = nullptr;
+  mRow = -1;
+
+  AccessibleWrap::Shutdown();
+}
+
+GroupPos
+XULTreeItemAccessibleBase::GroupPosition()
+{
+  GroupPos groupPos;
+
+  int32_t level;
+  nsresult rv = mTreeView->GetLevel(mRow, &level);
+  NS_ENSURE_SUCCESS(rv, groupPos);
+
+  int32_t topCount = 1;
+  for (int32_t index = mRow - 1; index >= 0; index--) {
+    int32_t lvl = -1;
+    if (NS_SUCCEEDED(mTreeView->GetLevel(index, &lvl))) {
+      if (lvl < level)
+        break;
+
+      if (lvl == level)
+        topCount++;
+    }
+  }
+
+  int32_t rowCount = 0;
+  rv = mTreeView->GetRowCount(&rowCount);
+  NS_ENSURE_SUCCESS(rv, groupPos);
+
+  int32_t bottomCount = 0;
+  for (int32_t index = mRow + 1; index < rowCount; index++) {
+    int32_t lvl = -1;
+    if (NS_SUCCEEDED(mTreeView->GetLevel(index, &lvl))) {
+      if (lvl < level)
+        break;
+
+      if (lvl == level)
+        bottomCount++;
+    }
+  }
+
+  groupPos.level = level + 1;
+  groupPos.setSize = topCount + bottomCount;
+  groupPos.posInSet = topCount;
+
+  return groupPos;
+}
+
+uint64_t
+XULTreeItemAccessibleBase::NativeState()
+{
+
+  // focusable and selectable states
+  uint64_t state = NativeInteractiveState();
+
+  // expanded/collapsed state
+  if (IsExpandable()) {
+    bool isContainerOpen;
+    mTreeView->IsContainerOpen(mRow, &isContainerOpen);
+    state |= isContainerOpen ? states::EXPANDED : states::COLLAPSED;
+  }
+
+  // selected state
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (selection) {
+    bool isSelected;
+    selection->IsSelected(mRow, &isSelected);
+    if (isSelected)
+      state |= states::SELECTED;
+  }
+
+  // focused state
+  if (FocusMgr()->IsFocused(this))
+    state |= states::FOCUSED;
+
+  // invisible state
+  int32_t firstVisibleRow, lastVisibleRow;
+  mTree->GetFirstVisibleRow(&firstVisibleRow);
+  mTree->GetLastVisibleRow(&lastVisibleRow);
+  if (mRow < firstVisibleRow || mRow > lastVisibleRow)
+    state |= states::INVISIBLE;
+
+  return state;
+}
+
+uint64_t
+XULTreeItemAccessibleBase::NativeInteractiveState() const
+{
+  return states::FOCUSABLE | states::SELECTABLE;
+}
+
+int32_t
+XULTreeItemAccessibleBase::IndexInParent() const
+{
+  return mParent ? mParent->ContentChildCount() + mRow : -1;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase: Widgets
+
+Accessible*
+XULTreeItemAccessibleBase::ContainerWidget() const
+{
+  return mParent;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase: Accessible protected methods
+
+void
+XULTreeItemAccessibleBase::DispatchClickEvent(nsIContent* aContent,
+                                              uint32_t aActionIndex)
+{
+  if (IsDefunct())
+    return;
+
+  nsCOMPtr<nsITreeColumns> columns;
+  mTree->GetColumns(getter_AddRefs(columns));
+  if (!columns)
+    return;
+
+  // Get column and pseudo element.
+  nsCOMPtr<nsITreeColumn> column;
+  nsAutoString pseudoElm;
+
+  if (aActionIndex == eAction_Click) {
+    // Key column is visible and clickable.
+    columns->GetKeyColumn(getter_AddRefs(column));
+  } else {
+    // Primary column contains a twisty we should click on.
+    columns->GetPrimaryColumn(getter_AddRefs(column));
+    pseudoElm = NS_LITERAL_STRING("twisty");
+  }
+
+  if (column)
+    nsCoreUtils::DispatchClickEvent(mTree, mRow, column, pseudoElm);
+}
+
+Accessible*
+XULTreeItemAccessibleBase::GetSiblingAtOffset(int32_t aOffset,
+                                              nsresult* aError) const
+{
+  if (aError)
+    *aError = NS_OK; // fail peacefully
+
+  return mParent->GetChildAt(IndexInParent() + aOffset);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase: protected implementation
+
+bool
+XULTreeItemAccessibleBase::IsExpandable()
+{
+
+  bool isContainer = false;
+  mTreeView->IsContainer(mRow, &isContainer);
+  if (isContainer) {
+    bool isEmpty = false;
+    mTreeView->IsContainerEmpty(mRow, &isEmpty);
+    if (!isEmpty) {
+      nsCOMPtr<nsITreeColumns> columns;
+      mTree->GetColumns(getter_AddRefs(columns));
+      nsCOMPtr<nsITreeColumn> primaryColumn;
+      if (columns) {
+        columns->GetPrimaryColumn(getter_AddRefs(primaryColumn));
+        if (primaryColumn &&
+            !nsCoreUtils::IsColumnHidden(primaryColumn))
+          return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+void
+XULTreeItemAccessibleBase::GetCellName(nsITreeColumn* aColumn, nsAString& aName)
+{
+
+  mTreeView->GetCellText(mRow, aColumn, aName);
+
+  // If there is still no name try the cell value:
+  // This is for graphical cells. We need tree/table view implementors to
+  // implement FooView::GetCellValue to return a meaningful string for cases
+  // where there is something shown in the cell (non-text) such as a star icon;
+  // in which case GetCellValue for that cell would return "starred" or
+  // "flagged" for example.
+  if (aName.IsEmpty())
+    mTreeView->GetCellValue(mRow, aColumn, aName);
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTreeItemAccessible::
+  XULTreeItemAccessible(nsIContent* aContent, DocAccessible* aDoc,
+                        Accessible* aParent, nsITreeBoxObject* aTree,
+                        nsITreeView* aTreeView, int32_t aRow) :
+  XULTreeItemAccessibleBase(aContent, aDoc, aParent, aTree, aTreeView, aRow)
+{
+  mStateFlags |= eNoKidsFromDOM;
+  mColumn = nsCoreUtils::GetFirstSensibleColumn(mTree);
+  GetCellName(mColumn, mCachedName);
+}
+
+XULTreeItemAccessible::~XULTreeItemAccessible()
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessible: nsISupports implementation
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(XULTreeItemAccessible,
+                                   XULTreeItemAccessibleBase,
+                                   mColumn)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(XULTreeItemAccessible)
+NS_INTERFACE_MAP_END_INHERITING(XULTreeItemAccessibleBase)
+NS_IMPL_ADDREF_INHERITED(XULTreeItemAccessible, XULTreeItemAccessibleBase)
+NS_IMPL_RELEASE_INHERITED(XULTreeItemAccessible, XULTreeItemAccessibleBase)
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessible: nsIAccessible implementation
+
+ENameValueFlag
+XULTreeItemAccessible::Name(nsString& aName)
+{
+  aName.Truncate();
+
+  GetCellName(mColumn, aName);
+  return eNameOK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessible: Accessible implementation
+
+void
+XULTreeItemAccessible::Shutdown()
+{
+  mColumn = nullptr;
+  XULTreeItemAccessibleBase::Shutdown();
+}
+
+role
+XULTreeItemAccessible::NativeRole()
+{
+  nsCOMPtr<nsITreeColumns> columns;
+  mTree->GetColumns(getter_AddRefs(columns));
+  if (!columns) {
+    NS_ERROR("No tree columns object in the tree!");
+    return roles::NOTHING;
+  }
+
+  nsCOMPtr<nsITreeColumn> primaryColumn;
+  columns->GetPrimaryColumn(getter_AddRefs(primaryColumn));
+
+  return primaryColumn ? roles::OUTLINEITEM : roles::LISTITEM;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessible: XULTreeItemAccessibleBase implementation
+
+void
+XULTreeItemAccessible::RowInvalidated(int32_t aStartColIdx, int32_t aEndColIdx)
+{
+  nsAutoString name;
+  Name(name);
+
+  if (name != mCachedName) {
+    nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
+    mCachedName = name;
+  }
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+//  XULTreeColumAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTreeColumAccessible::
+  XULTreeColumAccessible(nsIContent* aContent, DocAccessible* aDoc) :
+  XULColumAccessible(aContent, aDoc)
+{
+}
+
+Accessible*
+XULTreeColumAccessible::GetSiblingAtOffset(int32_t aOffset,
+                                           nsresult* aError) const
+{
+  if (aOffset < 0)
+    return XULColumAccessible::GetSiblingAtOffset(aOffset, aError);
+
+  if (aError)
+    *aError =  NS_OK; // fail peacefully
+
+  nsCOMPtr<nsITreeBoxObject> tree = nsCoreUtils::GetTreeBoxObject(mContent);
+  if (tree) {
+    nsCOMPtr<nsITreeView> treeView;
+    tree->GetView(getter_AddRefs(treeView));
+    if (treeView) {
+      int32_t rowCount = 0;
+      treeView->GetRowCount(&rowCount);
+      if (rowCount > 0 && aOffset <= rowCount) {
+        XULTreeAccessible* treeAcc = Parent()->AsXULTree();
+
+        if (treeAcc)
+          return treeAcc->GetTreeItemAccessible(aOffset - 1);
+      }
+    }
+  }
+
+  return nullptr;
+}
diff --git a/accessible/xul/XULTreeAccessible.h b/accessible/xul/XULTreeAccessible.h
new file mode 100644
index 000000000..489541c58
--- /dev/null
+++ b/accessible/xul/XULTreeAccessible.h
@@ -0,0 +1,279 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_XULTreeAccessible_h__
+#define mozilla_a11y_XULTreeAccessible_h__
+
+#include "nsITreeBoxObject.h"
+#include "nsITreeView.h"
+#include "nsITreeColumns.h"
+#include "XULListboxAccessible.h"
+
+class nsTreeBodyFrame;
+
+namespace mozilla {
+namespace a11y {
+
+class XULTreeGridCellAccessible;
+
+/*
+ * A class the represents the XUL Tree widget.
+ */
+const uint32_t kMaxTreeColumns = 100;
+const uint32_t kDefaultTreeCacheLength = 128;
+
+/**
+ * Accessible class for XUL tree element.
+ */
+
+class XULTreeAccessible : public AccessibleWrap
+{
+public:
+  XULTreeAccessible(nsIContent* aContent, DocAccessible* aDoc,
+                    nsTreeBodyFrame* aTreeframe);
+
+  // nsISupports and cycle collection
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeAccessible, Accessible)
+
+  // Accessible
+  virtual void Shutdown() override;
+  virtual void Value(nsString& aValue) override;
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+  virtual Accessible* ChildAtPoint(int32_t aX, int32_t aY,
+                                   EWhichChildAtPoint aWhichChild) override;
+
+  virtual Accessible* GetChildAt(uint32_t aIndex) const override;
+  virtual uint32_t ChildCount() const override;
+  virtual Relation RelationByType(RelationType aType) override;
+
+  // SelectAccessible
+  virtual void SelectedItems(nsTArray<Accessible*>* aItems) override;
+  virtual uint32_t SelectedItemCount() override;
+  virtual Accessible* GetSelectedItem(uint32_t aIndex) override;
+  virtual bool IsItemSelected(uint32_t aIndex) override;
+  virtual bool AddItemToSelection(uint32_t aIndex) override;
+  virtual bool RemoveItemFromSelection(uint32_t aIndex) override;
+  virtual bool SelectAll() override;
+  virtual bool UnselectAll() override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+  virtual Accessible* CurrentItem() override;
+  virtual void SetCurrentItem(Accessible* aItem) override;
+
+  virtual Accessible* ContainerWidget() const override;
+
+  // XULTreeAccessible
+
+  /**
+   * Return tree item accessible at the givem row. If accessible doesn't exist
+   * in the cache then create and cache it.
+   *
+   * @param aRow         [in] the given row index
+   */
+  Accessible* GetTreeItemAccessible(int32_t aRow) const;
+
+  /**
+   * Invalidates the number of cached treeitem accessibles.
+   *
+   * @param aRow    [in] row index the invalidation starts from
+   * @param aCount  [in] the number of treeitem accessibles to invalidate,
+   *                 the number sign specifies whether rows have been
+   *                 inserted (plus) or removed (minus)
+   */
+  void InvalidateCache(int32_t aRow, int32_t aCount);
+
+  /**
+   * Fires name change events for invalidated area of tree.
+   *
+   * @param aStartRow  [in] row index invalidation starts from
+   * @param aEndRow    [in] row index invalidation ends, -1 means last row index
+   * @param aStartCol  [in] column index invalidation starts from
+   * @param aEndCol    [in] column index invalidation ends, -1 mens last column
+   *                    index
+   */
+  void TreeViewInvalidated(int32_t aStartRow, int32_t aEndRow,
+                           int32_t aStartCol, int32_t aEndCol);
+
+  /**
+   * Invalidates children created for previous tree view.
+   */
+  void TreeViewChanged(nsITreeView* aView);
+
+protected:
+  virtual ~XULTreeAccessible();
+
+  /**
+   * Creates tree item accessible for the given row index.
+   */
+  virtual already_AddRefed<Accessible>
+    CreateTreeItemAccessible(int32_t aRow) const;
+
+  nsCOMPtr<nsITreeBoxObject> mTree;
+  nsITreeView* mTreeView;
+  mutable AccessibleHashtable mAccessibleCache;
+};
+
+/**
+ * Base class for tree item accessibles.
+ */
+
+#define XULTREEITEMBASEACCESSIBLE_IMPL_CID            \
+{  /* 1ab79ae7-766a-443c-940b-b1e6b0831dfc */         \
+  0x1ab79ae7,                                         \
+  0x766a,                                             \
+  0x443c,                                             \
+  { 0x94, 0x0b, 0xb1, 0xe6, 0xb0, 0x83, 0x1d, 0xfc }  \
+}
+
+class XULTreeItemAccessibleBase : public AccessibleWrap
+{
+public:
+  XULTreeItemAccessibleBase(nsIContent* aContent, DocAccessible* aDoc,
+                            Accessible* aParent, nsITreeBoxObject* aTree,
+                            nsITreeView* aTreeView, int32_t aRow);
+
+  // nsISupports and cycle collection
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeItemAccessibleBase,
+                                           AccessibleWrap)
+
+  // Accessible
+  virtual void Shutdown() override;
+  virtual nsIntRect Bounds() const override;
+  virtual GroupPos GroupPosition() override;
+  virtual uint64_t NativeState() override;
+  virtual uint64_t NativeInteractiveState() const override;
+  virtual int32_t IndexInParent() const override;
+  virtual Relation RelationByType(RelationType aType) override;
+  virtual Accessible* FocusedChild() override;
+  virtual void SetSelected(bool aSelect) override;
+  virtual void TakeFocus() override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+
+  // Widgets
+  virtual Accessible* ContainerWidget() const override;
+
+  // XULTreeItemAccessibleBase
+  NS_DECLARE_STATIC_IID_ACCESSOR(XULTREEITEMBASEACCESSIBLE_IMPL_CID)
+
+  /**
+   * Return row index associated with the accessible.
+   */
+  int32_t GetRowIndex() const { return mRow; }
+
+  /**
+   * Return cell accessible for the given column. If XUL tree accessible is not
+   * accessible table then return null.
+   */
+  virtual XULTreeGridCellAccessible* GetCellAccessible(nsITreeColumn* aColumn) const
+    { return nullptr; }
+
+  /**
+   * Proccess row invalidation. Used to fires name change events.
+   */
+  virtual void RowInvalidated(int32_t aStartColIdx, int32_t aEndColIdx) = 0;
+
+protected:
+  virtual ~XULTreeItemAccessibleBase();
+
+  enum { eAction_Click = 0, eAction_Expand = 1 };
+
+  // Accessible
+  virtual void DispatchClickEvent(nsIContent *aContent, uint32_t aActionIndex) override;
+  virtual Accessible* GetSiblingAtOffset(int32_t aOffset,
+                                         nsresult *aError = nullptr) const override;
+
+  // XULTreeItemAccessibleBase
+
+  /**
+   * Return true if the tree item accessible is expandable (contains subrows).
+   */
+  bool IsExpandable();
+
+  /**
+   * Return name for cell at the given column.
+   */
+  void GetCellName(nsITreeColumn* aColumn, nsAString& aName);
+
+  nsCOMPtr<nsITreeBoxObject> mTree;
+  nsITreeView* mTreeView;
+  int32_t mRow;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(XULTreeItemAccessibleBase,
+                              XULTREEITEMBASEACCESSIBLE_IMPL_CID)
+
+
+/**
+ * Accessible class for items for XUL tree.
+ */
+class XULTreeItemAccessible : public XULTreeItemAccessibleBase
+{
+public:
+  XULTreeItemAccessible(nsIContent* aContent, DocAccessible* aDoc,
+                        Accessible* aParent, nsITreeBoxObject* aTree,
+                        nsITreeView* aTreeView, int32_t aRow);
+
+  // nsISupports and cycle collection
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeItemAccessible,
+                                           XULTreeItemAccessibleBase)
+
+  // Accessible
+  virtual void Shutdown() override;
+  virtual ENameValueFlag Name(nsString& aName) override;
+  virtual a11y::role NativeRole() override;
+
+  // XULTreeItemAccessibleBase
+  virtual void RowInvalidated(int32_t aStartColIdx, int32_t aEndColIdx) override;
+
+protected:
+  virtual ~XULTreeItemAccessible();
+
+  // XULTreeItemAccessible
+  nsCOMPtr<nsITreeColumn> mColumn;
+  nsString mCachedName;
+};
+
+
+/**
+ * Accessible class for columns element of XUL tree.
+ */
+class XULTreeColumAccessible : public XULColumAccessible
+{
+public:
+  XULTreeColumAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+protected:
+
+  // Accessible
+  virtual Accessible* GetSiblingAtOffset(int32_t aOffset,
+                                         nsresult* aError = nullptr) const
+    override;
+};
+
+
+////////////////////////////////////////////////////////////////////////////////
+// Accessible downcasting method
+
+inline XULTreeAccessible*
+Accessible::AsXULTree()
+{
+  return IsXULTree() ? static_cast<XULTreeAccessible*>(this) : nullptr;
+}
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULTreeGridAccessible.cpp b/accessible/xul/XULTreeGridAccessible.cpp
new file mode 100644
index 000000000..e9e3a0e8f
--- /dev/null
+++ b/accessible/xul/XULTreeGridAccessible.cpp
@@ -0,0 +1,823 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "XULTreeGridAccessibleWrap.h"
+
+#include "nsAccCache.h"
+#include "nsAccessibilityService.h"
+#include "nsAccUtils.h"
+#include "DocAccessible.h"
+#include "nsEventShell.h"
+#include "Relation.h"
+#include "Role.h"
+#include "States.h"
+#include "nsQueryObject.h"
+
+#include "nsIBoxObject.h"
+#include "nsIMutableArray.h"
+#include "nsIPersistentProperties2.h"
+#include "nsITreeSelection.h"
+#include "nsComponentManagerUtils.h"
+
+using namespace mozilla::a11y;
+
+XULTreeGridAccessible::~XULTreeGridAccessible()
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridAccessible: Table
+
+uint32_t
+XULTreeGridAccessible::ColCount()
+{
+  return nsCoreUtils::GetSensibleColumnCount(mTree);
+}
+
+uint32_t
+XULTreeGridAccessible::RowCount()
+{
+  if (!mTreeView)
+    return 0;
+
+  int32_t rowCount = 0;
+  mTreeView->GetRowCount(&rowCount);
+  return rowCount >= 0 ? rowCount : 0;
+}
+
+uint32_t
+XULTreeGridAccessible::SelectedCellCount()
+{
+  return SelectedRowCount() * ColCount();
+}
+
+uint32_t
+XULTreeGridAccessible::SelectedColCount()
+{
+  // If all the row has been selected, then all the columns are selected,
+  // because we can't select a column alone.
+
+  uint32_t selectedRowCount = SelectedItemCount();
+  return selectedRowCount > 0 && selectedRowCount == RowCount() ? ColCount() : 0;
+}
+
+uint32_t
+XULTreeGridAccessible::SelectedRowCount()
+{
+  return SelectedItemCount();
+}
+
+void
+XULTreeGridAccessible::SelectedCells(nsTArray<Accessible*>* aCells)
+{
+  uint32_t colCount = ColCount(), rowCount = RowCount();
+
+  for (uint32_t rowIdx = 0; rowIdx < rowCount; rowIdx++) {
+    if (IsRowSelected(rowIdx)) {
+      for (uint32_t colIdx = 0; colIdx < colCount; colIdx++) {
+        Accessible* cell = CellAt(rowIdx, colIdx);
+        aCells->AppendElement(cell);
+      }
+    }
+  }
+}
+
+void
+XULTreeGridAccessible::SelectedCellIndices(nsTArray<uint32_t>* aCells)
+{
+  uint32_t colCount = ColCount(), rowCount = RowCount();
+
+  for (uint32_t rowIdx = 0; rowIdx < rowCount; rowIdx++)
+    if (IsRowSelected(rowIdx))
+      for (uint32_t colIdx = 0; colIdx < colCount; colIdx++)
+        aCells->AppendElement(rowIdx * colCount + colIdx);
+}
+
+void
+XULTreeGridAccessible::SelectedColIndices(nsTArray<uint32_t>* aCols)
+{
+  if (RowCount() != SelectedRowCount())
+    return;
+
+  uint32_t colCount = ColCount();
+  aCols->SetCapacity(colCount);
+  for (uint32_t colIdx = 0; colIdx < colCount; colIdx++)
+    aCols->AppendElement(colIdx);
+}
+
+void
+XULTreeGridAccessible::SelectedRowIndices(nsTArray<uint32_t>* aRows)
+{
+  uint32_t rowCount = RowCount();
+  for (uint32_t rowIdx = 0; rowIdx < rowCount; rowIdx++)
+    if (IsRowSelected(rowIdx))
+      aRows->AppendElement(rowIdx);
+}
+
+Accessible*
+XULTreeGridAccessible::CellAt(uint32_t aRowIndex, uint32_t aColumnIndex)
+{
+  Accessible* row = GetTreeItemAccessible(aRowIndex);
+  if (!row)
+    return nullptr;
+
+  nsCOMPtr<nsITreeColumn> column =
+    nsCoreUtils::GetSensibleColumnAt(mTree, aColumnIndex);
+  if (!column)
+    return nullptr;
+
+  RefPtr<XULTreeItemAccessibleBase> rowAcc = do_QueryObject(row);
+  if (!rowAcc)
+    return nullptr;
+
+  return rowAcc->GetCellAccessible(column);
+}
+
+void
+XULTreeGridAccessible::ColDescription(uint32_t aColIdx, nsString& aDescription)
+{
+  aDescription.Truncate();
+
+  Accessible* treeColumns = Accessible::GetChildAt(0);
+  if (treeColumns) {
+    Accessible* treeColumnItem = treeColumns->GetChildAt(aColIdx);
+    if (treeColumnItem)
+      treeColumnItem->Name(aDescription);
+  }
+}
+
+bool
+XULTreeGridAccessible::IsColSelected(uint32_t aColIdx)
+{
+  // If all the row has been selected, then all the columns are selected.
+  // Because we can't select a column alone.
+  return SelectedItemCount() == RowCount();
+}
+
+bool
+XULTreeGridAccessible::IsRowSelected(uint32_t aRowIdx)
+{
+  if (!mTreeView)
+    return false;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  nsresult rv = mTreeView->GetSelection(getter_AddRefs(selection));
+  NS_ENSURE_SUCCESS(rv, false);
+
+  bool isSelected = false;
+  selection->IsSelected(aRowIdx, &isSelected);
+  return isSelected;
+}
+
+bool
+XULTreeGridAccessible::IsCellSelected(uint32_t aRowIdx, uint32_t aColIdx)
+{
+  return IsRowSelected(aRowIdx);
+}
+
+void
+XULTreeGridAccessible::SelectRow(uint32_t aRowIdx)
+{
+  if (!mTreeView)
+    return;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  NS_ASSERTION(selection, "GetSelection() Shouldn't fail!");
+
+  selection->Select(aRowIdx);
+}
+
+void
+XULTreeGridAccessible::UnselectRow(uint32_t aRowIdx)
+{
+  if (!mTreeView)
+    return;
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+
+  if (selection)
+    selection->ClearRange(aRowIdx, aRowIdx);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridAccessible: Accessible implementation
+
+role
+XULTreeGridAccessible::NativeRole()
+{
+  nsCOMPtr<nsITreeColumns> treeColumns;
+  mTree->GetColumns(getter_AddRefs(treeColumns));
+  if (!treeColumns) {
+    NS_ERROR("No treecolumns object for tree!");
+    return roles::NOTHING;
+  }
+
+  nsCOMPtr<nsITreeColumn> primaryColumn;
+  treeColumns->GetPrimaryColumn(getter_AddRefs(primaryColumn));
+
+  return primaryColumn ? roles::TREE_TABLE : roles::TABLE;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridAccessible: XULTreeAccessible implementation
+
+already_AddRefed<Accessible>
+XULTreeGridAccessible::CreateTreeItemAccessible(int32_t aRow) const
+{
+  RefPtr<Accessible> accessible =
+    new XULTreeGridRowAccessible(mContent, mDoc,
+                                 const_cast<XULTreeGridAccessible*>(this),
+                                 mTree, mTreeView, aRow);
+
+  return accessible.forget();
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridRowAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTreeGridRowAccessible::
+  XULTreeGridRowAccessible(nsIContent* aContent, DocAccessible* aDoc,
+                           Accessible* aTreeAcc, nsITreeBoxObject* aTree,
+                           nsITreeView* aTreeView, int32_t aRow) :
+  XULTreeItemAccessibleBase(aContent, aDoc, aTreeAcc, aTree, aTreeView, aRow),
+  mAccessibleCache(kDefaultTreeCacheLength)
+{
+  mGenericTypes |= eTableRow;
+  mStateFlags |= eNoKidsFromDOM;
+}
+
+XULTreeGridRowAccessible::~XULTreeGridRowAccessible()
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridRowAccessible: nsISupports and cycle collection implementation
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(XULTreeGridRowAccessible,
+                                   XULTreeItemAccessibleBase,
+                                   mAccessibleCache)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(XULTreeGridRowAccessible)
+NS_INTERFACE_MAP_END_INHERITING(XULTreeItemAccessibleBase)
+
+NS_IMPL_ADDREF_INHERITED(XULTreeGridRowAccessible,
+                         XULTreeItemAccessibleBase)
+NS_IMPL_RELEASE_INHERITED(XULTreeGridRowAccessible,
+                          XULTreeItemAccessibleBase)
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridRowAccessible: Accessible implementation
+
+void
+XULTreeGridRowAccessible::Shutdown()
+{
+  if (mDoc && !mDoc->IsDefunct()) {
+    UnbindCacheEntriesFromDocument(mAccessibleCache);
+  }
+
+  XULTreeItemAccessibleBase::Shutdown();
+}
+
+role
+XULTreeGridRowAccessible::NativeRole()
+{
+  return roles::ROW;
+}
+
+ENameValueFlag
+XULTreeGridRowAccessible::Name(nsString& aName)
+{
+  aName.Truncate();
+
+  // XXX: the row name sholdn't be a concatenation of cell names (bug 664384).
+  nsCOMPtr<nsITreeColumn> column = nsCoreUtils::GetFirstSensibleColumn(mTree);
+  while (column) {
+    if (!aName.IsEmpty())
+      aName.Append(' ');
+
+    nsAutoString cellName;
+    GetCellName(column, cellName);
+    aName.Append(cellName);
+
+    column = nsCoreUtils::GetNextSensibleColumn(column);
+  }
+
+  return eNameOK;
+}
+
+Accessible*
+XULTreeGridRowAccessible::ChildAtPoint(int32_t aX, int32_t aY,
+                                       EWhichChildAtPoint aWhichChild)
+{
+  nsIFrame *frame = GetFrame();
+  if (!frame)
+    return nullptr;
+
+  nsPresContext *presContext = frame->PresContext();
+  nsIPresShell* presShell = presContext->PresShell();
+
+  nsIFrame *rootFrame = presShell->GetRootFrame();
+  NS_ENSURE_TRUE(rootFrame, nullptr);
+
+  nsIntRect rootRect = rootFrame->GetScreenRect();
+
+  int32_t clientX = presContext->DevPixelsToIntCSSPixels(aX) - rootRect.x;
+  int32_t clientY = presContext->DevPixelsToIntCSSPixels(aY) - rootRect.y;
+
+  int32_t row = -1;
+  nsCOMPtr<nsITreeColumn> column;
+  nsAutoString childEltUnused;
+  mTree->GetCellAt(clientX, clientY, &row, getter_AddRefs(column),
+                   childEltUnused);
+
+  // Return if we failed to find tree cell in the row for the given point.
+  if (row != mRow || !column)
+    return nullptr;
+
+  return GetCellAccessible(column);
+}
+
+Accessible*
+XULTreeGridRowAccessible::GetChildAt(uint32_t aIndex) const
+{
+  if (IsDefunct())
+    return nullptr;
+
+  nsCOMPtr<nsITreeColumn> column =
+    nsCoreUtils::GetSensibleColumnAt(mTree, aIndex);
+  if (!column)
+    return nullptr;
+
+  return GetCellAccessible(column);
+}
+
+uint32_t
+XULTreeGridRowAccessible::ChildCount() const
+{
+  return nsCoreUtils::GetSensibleColumnCount(mTree);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridRowAccessible: XULTreeItemAccessibleBase implementation
+
+XULTreeGridCellAccessible*
+XULTreeGridRowAccessible::GetCellAccessible(nsITreeColumn* aColumn) const
+{
+  NS_PRECONDITION(aColumn, "No tree column!");
+
+  void* key = static_cast<void*>(aColumn);
+  XULTreeGridCellAccessible* cachedCell = mAccessibleCache.GetWeak(key);
+  if (cachedCell)
+    return cachedCell;
+
+  RefPtr<XULTreeGridCellAccessible> cell =
+    new XULTreeGridCellAccessibleWrap(mContent, mDoc,
+                                      const_cast<XULTreeGridRowAccessible*>(this),
+                                      mTree, mTreeView, mRow, aColumn);
+  mAccessibleCache.Put(key, cell);
+  Document()->BindToDocument(cell, nullptr);
+  return cell;
+}
+
+void
+XULTreeGridRowAccessible::RowInvalidated(int32_t aStartColIdx,
+                                         int32_t aEndColIdx)
+{
+  nsCOMPtr<nsITreeColumns> treeColumns;
+  mTree->GetColumns(getter_AddRefs(treeColumns));
+  if (!treeColumns)
+    return;
+
+  bool nameChanged = false;
+  for (int32_t colIdx = aStartColIdx; colIdx <= aEndColIdx; ++colIdx) {
+    nsCOMPtr<nsITreeColumn> column;
+    treeColumns->GetColumnAt(colIdx, getter_AddRefs(column));
+    if (column && !nsCoreUtils::IsColumnHidden(column)) {
+      XULTreeGridCellAccessible* cell = GetCellAccessible(column);
+      if (cell)
+        nameChanged |= cell->CellInvalidated();
+    }
+  }
+
+  if (nameChanged)
+    nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
+
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridCellAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTreeGridCellAccessible::
+  XULTreeGridCellAccessible(nsIContent* aContent, DocAccessible* aDoc,
+                            XULTreeGridRowAccessible* aRowAcc,
+                            nsITreeBoxObject* aTree, nsITreeView* aTreeView,
+                            int32_t aRow, nsITreeColumn* aColumn) :
+  LeafAccessible(aContent, aDoc), mTree(aTree),
+  mTreeView(aTreeView), mRow(aRow), mColumn(aColumn)
+{
+  mParent = aRowAcc;
+  mStateFlags |= eSharedNode;
+  mGenericTypes |= eTableCell;
+
+  NS_ASSERTION(mTreeView, "mTreeView is null");
+
+  int16_t type = -1;
+  mColumn->GetType(&type);
+  if (type == nsITreeColumn::TYPE_CHECKBOX)
+    mTreeView->GetCellValue(mRow, mColumn, mCachedTextEquiv);
+  else
+    mTreeView->GetCellText(mRow, mColumn, mCachedTextEquiv);
+}
+
+XULTreeGridCellAccessible::~XULTreeGridCellAccessible()
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridCellAccessible: nsISupports implementation
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(XULTreeGridCellAccessible, LeafAccessible,
+                                   mTree, mColumn)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(XULTreeGridCellAccessible)
+NS_INTERFACE_MAP_END_INHERITING(LeafAccessible)
+NS_IMPL_ADDREF_INHERITED(XULTreeGridCellAccessible, LeafAccessible)
+NS_IMPL_RELEASE_INHERITED(XULTreeGridCellAccessible, LeafAccessible)
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridCellAccessible: Accessible
+
+Accessible*
+XULTreeGridCellAccessible::FocusedChild()
+{
+  return nullptr;
+}
+
+ENameValueFlag
+XULTreeGridCellAccessible::Name(nsString& aName)
+{
+  aName.Truncate();
+
+  if (!mTreeView)
+    return eNameOK;
+
+  mTreeView->GetCellText(mRow, mColumn, aName);
+
+  // If there is still no name try the cell value:
+  // This is for graphical cells. We need tree/table view implementors to implement
+  // FooView::GetCellValue to return a meaningful string for cases where there is
+  // something shown in the cell (non-text) such as a star icon; in which case
+  // GetCellValue for that cell would return "starred" or "flagged" for example.
+  if (aName.IsEmpty())
+    mTreeView->GetCellValue(mRow, mColumn, aName);
+
+  return eNameOK;
+}
+
+nsIntRect
+XULTreeGridCellAccessible::Bounds() const
+{
+  // Get bounds for tree cell and add x and y of treechildren element to
+  // x and y of the cell.
+  nsCOMPtr<nsIBoxObject> boxObj = nsCoreUtils::GetTreeBodyBoxObject(mTree);
+  if (!boxObj)
+    return nsIntRect();
+
+  int32_t x = 0, y = 0, width = 0, height = 0;
+  nsresult rv = mTree->GetCoordsForCellItem(mRow, mColumn,
+                                            NS_LITERAL_STRING("cell"),
+                                            &x, &y, &width, &height);
+  if (NS_FAILED(rv))
+    return nsIntRect();
+
+  int32_t tcX = 0, tcY = 0;
+  boxObj->GetScreenX(&tcX);
+  boxObj->GetScreenY(&tcY);
+  x += tcX;
+  y += tcY;
+
+  nsPresContext* presContext = mDoc->PresContext();
+  return nsIntRect(presContext->CSSPixelsToDevPixels(x),
+                   presContext->CSSPixelsToDevPixels(y),
+                   presContext->CSSPixelsToDevPixels(width),
+                   presContext->CSSPixelsToDevPixels(height));
+}
+
+uint8_t
+XULTreeGridCellAccessible::ActionCount()
+{
+  bool isCycler = false;
+  mColumn->GetCycler(&isCycler);
+  if (isCycler)
+    return 1;
+
+  int16_t type;
+  mColumn->GetType(&type);
+  if (type == nsITreeColumn::TYPE_CHECKBOX && IsEditable())
+    return 1;
+
+  return 0;
+}
+
+void
+XULTreeGridCellAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
+{
+  aName.Truncate();
+
+  if (aIndex != eAction_Click || !mTreeView)
+    return;
+
+  bool isCycler = false;
+  mColumn->GetCycler(&isCycler);
+  if (isCycler) {
+    aName.AssignLiteral("cycle");
+    return;
+  }
+
+  int16_t type = 0;
+  mColumn->GetType(&type);
+  if (type == nsITreeColumn::TYPE_CHECKBOX && IsEditable()) {
+    nsAutoString value;
+    mTreeView->GetCellValue(mRow, mColumn, value);
+    if (value.EqualsLiteral("true"))
+      aName.AssignLiteral("uncheck");
+    else
+      aName.AssignLiteral("check");
+  }
+}
+
+bool
+XULTreeGridCellAccessible::DoAction(uint8_t aIndex)
+{
+  if (aIndex != eAction_Click)
+    return false;
+
+  bool isCycler = false;
+  mColumn->GetCycler(&isCycler);
+  if (isCycler) {
+    DoCommand();
+    return true;
+  }
+
+  int16_t type;
+  mColumn->GetType(&type);
+  if (type == nsITreeColumn::TYPE_CHECKBOX && IsEditable()) {
+    DoCommand();
+    return true;
+  }
+
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridCellAccessible: TableCell
+
+TableAccessible*
+XULTreeGridCellAccessible::Table() const
+{
+  Accessible* grandParent = mParent->Parent();
+  if (grandParent)
+    return grandParent->AsTable();
+
+  return nullptr;
+}
+
+uint32_t
+XULTreeGridCellAccessible::ColIdx() const
+{
+  uint32_t colIdx = 0;
+  nsCOMPtr<nsITreeColumn> column = mColumn;
+  while ((column = nsCoreUtils::GetPreviousSensibleColumn(column)))
+    colIdx++;
+
+  return colIdx;
+}
+
+uint32_t
+XULTreeGridCellAccessible::RowIdx() const
+{
+  return mRow;
+}
+
+void
+XULTreeGridCellAccessible::ColHeaderCells(nsTArray<Accessible*>* aHeaderCells)
+{
+  nsCOMPtr<nsIDOMElement> columnElm;
+  mColumn->GetElement(getter_AddRefs(columnElm));
+
+  nsCOMPtr<nsIContent> columnContent(do_QueryInterface(columnElm));
+  Accessible* headerCell = mDoc->GetAccessible(columnContent);
+  if (headerCell)
+    aHeaderCells->AppendElement(headerCell);
+}
+
+bool
+XULTreeGridCellAccessible::Selected()
+{
+  nsCOMPtr<nsITreeSelection> selection;
+  nsresult rv = mTreeView->GetSelection(getter_AddRefs(selection));
+  NS_ENSURE_SUCCESS(rv, false);
+
+  bool selected = false;
+  selection->IsSelected(mRow, &selected);
+  return selected;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridCellAccessible: Accessible public implementation
+
+already_AddRefed<nsIPersistentProperties>
+XULTreeGridCellAccessible::NativeAttributes()
+{
+  nsCOMPtr<nsIPersistentProperties> attributes =
+    do_CreateInstance(NS_PERSISTENTPROPERTIES_CONTRACTID);
+
+  // "table-cell-index" attribute
+  TableAccessible* table = Table();
+  if (!table)
+    return attributes.forget();
+
+  nsAutoString stringIdx;
+  stringIdx.AppendInt(table->CellIndexAt(mRow, ColIdx()));
+  nsAccUtils::SetAccAttr(attributes, nsGkAtoms::tableCellIndex, stringIdx);
+
+  // "cycles" attribute
+  bool isCycler = false;
+  nsresult rv = mColumn->GetCycler(&isCycler);
+  if (NS_SUCCEEDED(rv) && isCycler)
+    nsAccUtils::SetAccAttr(attributes, nsGkAtoms::cycles,
+                           NS_LITERAL_STRING("true"));
+
+  return attributes.forget();
+}
+
+role
+XULTreeGridCellAccessible::NativeRole()
+{
+  return roles::GRID_CELL;
+}
+
+uint64_t
+XULTreeGridCellAccessible::NativeState()
+{
+  if (!mTreeView)
+    return states::DEFUNCT;
+
+  // selectable/selected state
+  uint64_t states = states::SELECTABLE; // keep in sync with NativeInteractiveState
+
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (selection) {
+    bool isSelected = false;
+    selection->IsSelected(mRow, &isSelected);
+    if (isSelected)
+      states |= states::SELECTED;
+  }
+
+  // checked state
+  int16_t type;
+  mColumn->GetType(&type);
+  if (type == nsITreeColumn::TYPE_CHECKBOX) {
+    states |= states::CHECKABLE;
+    nsAutoString checked;
+    mTreeView->GetCellValue(mRow, mColumn, checked);
+    if (checked.EqualsIgnoreCase("true"))
+      states |= states::CHECKED;
+  }
+
+  return states;
+}
+
+uint64_t
+XULTreeGridCellAccessible::NativeInteractiveState() const
+{
+  return states::SELECTABLE;
+}
+
+int32_t
+XULTreeGridCellAccessible::IndexInParent() const
+{
+  return ColIdx();
+}
+
+Relation
+XULTreeGridCellAccessible::RelationByType(RelationType aType)
+{
+  return Relation();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridCellAccessible: public implementation
+
+bool
+XULTreeGridCellAccessible::CellInvalidated()
+{
+
+  nsAutoString textEquiv;
+
+  int16_t type;
+  mColumn->GetType(&type);
+  if (type == nsITreeColumn::TYPE_CHECKBOX) {
+    mTreeView->GetCellValue(mRow, mColumn, textEquiv);
+    if (mCachedTextEquiv != textEquiv) {
+      bool isEnabled = textEquiv.EqualsLiteral("true");
+      RefPtr<AccEvent> accEvent =
+        new AccStateChangeEvent(this, states::CHECKED, isEnabled);
+      nsEventShell::FireEvent(accEvent);
+
+      mCachedTextEquiv = textEquiv;
+      return true;
+    }
+
+    return false;
+  }
+
+  mTreeView->GetCellText(mRow, mColumn, textEquiv);
+  if (mCachedTextEquiv != textEquiv) {
+    nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
+    mCachedTextEquiv = textEquiv;
+    return true;
+  }
+
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridCellAccessible: Accessible protected implementation
+
+Accessible*
+XULTreeGridCellAccessible::GetSiblingAtOffset(int32_t aOffset,
+                                              nsresult* aError) const
+{
+  if (aError)
+    *aError =  NS_OK; // fail peacefully
+
+  nsCOMPtr<nsITreeColumn> columnAtOffset(mColumn), column;
+  if (aOffset < 0) {
+    for (int32_t index = aOffset; index < 0 && columnAtOffset; index++) {
+      column = nsCoreUtils::GetPreviousSensibleColumn(columnAtOffset);
+      column.swap(columnAtOffset);
+    }
+  } else {
+    for (int32_t index = aOffset; index > 0 && columnAtOffset; index--) {
+      column = nsCoreUtils::GetNextSensibleColumn(columnAtOffset);
+      column.swap(columnAtOffset);
+    }
+  }
+
+  if (!columnAtOffset)
+    return nullptr;
+
+  RefPtr<XULTreeItemAccessibleBase> rowAcc = do_QueryObject(Parent());
+  return rowAcc->GetCellAccessible(columnAtOffset);
+}
+
+void
+XULTreeGridCellAccessible::DispatchClickEvent(nsIContent* aContent,
+                                              uint32_t aActionIndex)
+{
+  if (IsDefunct())
+    return;
+
+  nsCoreUtils::DispatchClickEvent(mTree, mRow, mColumn);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridCellAccessible: protected implementation
+
+bool
+XULTreeGridCellAccessible::IsEditable() const
+{
+
+  // XXX: logic corresponds to tree.xml, it's preferable to have interface
+  // method to check it.
+  bool isEditable = false;
+  nsresult rv = mTreeView->IsEditable(mRow, mColumn, &isEditable);
+  if (NS_FAILED(rv) || !isEditable)
+    return false;
+
+  nsCOMPtr<nsIDOMElement> columnElm;
+  mColumn->GetElement(getter_AddRefs(columnElm));
+  if (!columnElm)
+    return false;
+
+  nsCOMPtr<nsIContent> columnContent(do_QueryInterface(columnElm));
+  if (!columnContent->AttrValueIs(kNameSpaceID_None,
+                                  nsGkAtoms::editable,
+                                  nsGkAtoms::_true,
+                                  eCaseMatters))
+    return false;
+
+  return mContent->AttrValueIs(kNameSpaceID_None,
+                               nsGkAtoms::editable,
+                               nsGkAtoms::_true, eCaseMatters);
+}
diff --git a/accessible/xul/XULTreeGridAccessible.h b/accessible/xul/XULTreeGridAccessible.h
new file mode 100644
index 000000000..6a6bd0606
--- /dev/null
+++ b/accessible/xul/XULTreeGridAccessible.h
@@ -0,0 +1,187 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_XULTreeGridAccessible_h__
+#define mozilla_a11y_XULTreeGridAccessible_h__
+
+#include "XULTreeAccessible.h"
+#include "TableAccessible.h"
+#include "TableCellAccessible.h"
+#include "xpcAccessibleTable.h"
+#include "xpcAccessibleTableCell.h"
+
+namespace mozilla {
+namespace a11y {
+
+class XULTreeGridCellAccessible;
+
+/**
+ * Represents accessible for XUL tree in the case when it has multiple columns.
+ */
+class XULTreeGridAccessible : public XULTreeAccessible,
+                              public TableAccessible
+{
+public:
+  XULTreeGridAccessible(nsIContent* aContent, DocAccessible* aDoc,
+                        nsTreeBodyFrame* aTreeFrame) :
+    XULTreeAccessible(aContent, aDoc, aTreeFrame)
+    { mGenericTypes |= eTable; }
+
+  // TableAccessible
+  virtual uint32_t ColCount() override;
+  virtual uint32_t RowCount() override;
+  virtual Accessible* CellAt(uint32_t aRowIndex, uint32_t aColumnIndex) override;
+  virtual void ColDescription(uint32_t aColIdx, nsString& aDescription) override;
+  virtual bool IsColSelected(uint32_t aColIdx) override;
+  virtual bool IsRowSelected(uint32_t aRowIdx) override;
+  virtual bool IsCellSelected(uint32_t aRowIdx, uint32_t aColIdx) override;
+  virtual uint32_t SelectedCellCount() override;
+  virtual uint32_t SelectedColCount() override;
+  virtual uint32_t SelectedRowCount() override;
+  virtual void SelectedCells(nsTArray<Accessible*>* aCells) override;
+  virtual void SelectedCellIndices(nsTArray<uint32_t>* aCells) override;
+  virtual void SelectedColIndices(nsTArray<uint32_t>* aCols) override;
+  virtual void SelectedRowIndices(nsTArray<uint32_t>* aRows) override;
+  virtual void SelectRow(uint32_t aRowIdx) override;
+  virtual void UnselectRow(uint32_t aRowIdx) override;
+  virtual Accessible* AsAccessible() override { return this; }
+
+  // Accessible
+  virtual TableAccessible* AsTable() override { return this; }
+  virtual a11y::role NativeRole() override;
+
+protected:
+  virtual ~XULTreeGridAccessible();
+
+  // XULTreeAccessible
+  virtual already_AddRefed<Accessible>
+    CreateTreeItemAccessible(int32_t aRow) const override;
+};
+
+
+/**
+ * Represents accessible for XUL tree item in the case when XUL tree has
+ * multiple columns.
+ */
+class XULTreeGridRowAccessible final : public XULTreeItemAccessibleBase
+{
+public:
+  using Accessible::GetChildAt;
+
+  XULTreeGridRowAccessible(nsIContent* aContent, DocAccessible* aDoc,
+                           Accessible* aParent, nsITreeBoxObject* aTree,
+                           nsITreeView* aTreeView, int32_t aRow);
+
+  // nsISupports and cycle collection
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeGridRowAccessible,
+                                           XULTreeItemAccessibleBase)
+
+  // Accessible
+  virtual void Shutdown() override;
+  virtual a11y::role NativeRole() override;
+  virtual ENameValueFlag Name(nsString& aName) override;
+  virtual Accessible* ChildAtPoint(int32_t aX, int32_t aY,
+                                   EWhichChildAtPoint aWhichChild) override;
+
+  virtual Accessible* GetChildAt(uint32_t aIndex) const override;
+  virtual uint32_t ChildCount() const override;
+
+  // XULTreeItemAccessibleBase
+  virtual XULTreeGridCellAccessible* GetCellAccessible(nsITreeColumn* aColumn)
+    const override final;
+  virtual void RowInvalidated(int32_t aStartColIdx, int32_t aEndColIdx) override;
+
+protected:
+  virtual ~XULTreeGridRowAccessible();
+
+  // XULTreeItemAccessibleBase
+  mutable nsRefPtrHashtable<nsPtrHashKey<const void>, XULTreeGridCellAccessible>
+    mAccessibleCache;
+};
+
+
+/**
+ * Represents an accessible for XUL tree cell in the case when XUL tree has
+ * multiple columns.
+ */
+
+class XULTreeGridCellAccessible : public LeafAccessible,
+                                  public TableCellAccessible
+{
+public:
+
+  XULTreeGridCellAccessible(nsIContent* aContent, DocAccessible* aDoc,
+                            XULTreeGridRowAccessible* aRowAcc,
+                            nsITreeBoxObject* aTree, nsITreeView* aTreeView,
+                            int32_t aRow, nsITreeColumn* aColumn);
+
+  // nsISupports
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeGridCellAccessible,
+                                           LeafAccessible)
+
+  // Accessible
+  virtual TableCellAccessible* AsTableCell() override { return this; }
+  virtual nsIntRect Bounds() const override;
+  virtual ENameValueFlag Name(nsString& aName) override;
+  virtual Accessible* FocusedChild() override;
+  virtual already_AddRefed<nsIPersistentProperties> NativeAttributes() override;
+  virtual int32_t IndexInParent() const override;
+  virtual Relation RelationByType(RelationType aType) override;
+  virtual a11y::role NativeRole() override;
+  virtual uint64_t NativeState() override;
+  virtual uint64_t NativeInteractiveState() const override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) override;
+
+  // TableCellAccessible
+  virtual TableAccessible* Table() const override;
+  virtual uint32_t ColIdx() const override;
+  virtual uint32_t RowIdx() const override;
+  virtual void ColHeaderCells(nsTArray<Accessible*>* aHeaderCells) override;
+  virtual void RowHeaderCells(nsTArray<Accessible*>* aCells) override { }
+  virtual bool Selected() override;
+
+  /**
+   * Fire name or state change event if the accessible text or value has been
+   * changed.
+   * @return true if name has changed
+   */
+  bool CellInvalidated();
+
+protected:
+  virtual ~XULTreeGridCellAccessible();
+
+  // Accessible
+  virtual Accessible* GetSiblingAtOffset(int32_t aOffset,
+                                         nsresult* aError = nullptr) const override;
+  virtual void DispatchClickEvent(nsIContent* aContent, uint32_t aActionIndex) override;
+
+  // XULTreeGridCellAccessible
+
+  /**
+   * Return true if value of cell can be modified.
+   */
+  bool IsEditable() const;
+
+  enum { eAction_Click = 0 };
+
+  nsCOMPtr<nsITreeBoxObject> mTree;
+  nsITreeView* mTreeView;
+
+  int32_t mRow;
+  nsCOMPtr<nsITreeColumn> mColumn;
+
+  nsString mCachedTextEquiv;
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif
diff --git a/accessible/xul/moz.build b/accessible/xul/moz.build
new file mode 100644
index 000000000..df159b274
--- /dev/null
+++ b/accessible/xul/moz.build
@@ -0,0 +1,55 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+UNIFIED_SOURCES += [
+    'XULAlertAccessible.cpp',
+    'XULColorPickerAccessible.cpp',
+    'XULComboboxAccessible.cpp',
+    'XULElementAccessibles.cpp',
+    'XULFormControlAccessible.cpp',
+    'XULListboxAccessible.cpp',
+    'XULMenuAccessible.cpp',
+    'XULSelectControlAccessible.cpp',
+    'XULSliderAccessible.cpp',
+    'XULTabAccessible.cpp',
+    'XULTreeAccessible.cpp',
+    'XULTreeGridAccessible.cpp',
+]
+
+LOCAL_INCLUDES += [
+    '/accessible/base',
+    '/accessible/generic',
+    '/accessible/html',
+    '/accessible/xpcom',
+    '/layout/generic',
+    '/layout/xul',
+    '/layout/xul/tree',
+]
+
+if 'gtk' in CONFIG['MOZ_WIDGET_TOOLKIT']:
+    LOCAL_INCLUDES += [
+        '/accessible/atk',
+    ]
+elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'windows':
+    LOCAL_INCLUDES += [
+        '/accessible/windows/ia2',
+        '/accessible/windows/msaa',
+    ]
+elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa':
+    LOCAL_INCLUDES += [
+        '/accessible/mac',
+    ]
+else:
+    LOCAL_INCLUDES += [
+        '/accessible/other',
+    ]
+
+include('/ipc/chromium/chromium-config.mozbuild')
+
+FINAL_LIBRARY = 'xul'
+
+if CONFIG['GNU_CXX']:
+    CXXFLAGS += ['-Wno-error=shadow']