Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

21 files changed, 5186 insertions, 0 deletions

diff --git a/accessible/xul/XULAlertAccessible.cpp b/accessible/xul/XULAlertAccessible.cpp
new file mode 100644
index 0000000000..64c1fe7aa0
--- /dev/null
+++ b/accessible/xul/XULAlertAccessible.cpp
@@ -0,0 +1,44 @@
+/* -*- 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 "LocalAccessible-inl.h"
+#include "mozilla/a11y/Role.h"
+#include "States.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULAlertAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULAlertAccessible::XULAlertAccessible(nsIContent* aContent,
+                                       DocAccessible* aDoc)
+    : AccessibleWrap(aContent, aDoc) {
+  mGenericTypes |= eAlert;
+}
+
+XULAlertAccessible::~XULAlertAccessible() {}
+
+role XULAlertAccessible::NativeRole() const { return roles::ALERT; }
+
+uint64_t XULAlertAccessible::NativeState() const {
+  return LocalAccessible::NativeState() | states::ALERT;
+}
+
+ENameValueFlag XULAlertAccessible::Name(nsString& aName) const {
+  // 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; }
+
+LocalAccessible* XULAlertAccessible::ContainerWidget() const { return nullptr; }
diff --git a/accessible/xul/XULAlertAccessible.h b/accessible/xul/XULAlertAccessible.h
new file mode 100644
index 0000000000..12594e987d
--- /dev/null
+++ b/accessible/xul/XULAlertAccessible.h
@@ -0,0 +1,40 @@
+/* -*- 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 {
+
+/**
+ * LocalAccessible for supporting XUL alerts.
+ */
+
+class XULAlertAccessible : public AccessibleWrap {
+ public:
+  XULAlertAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(XULAlertAccessible, AccessibleWrap)
+
+  // LocalAccessible
+  virtual mozilla::a11y::ENameValueFlag Name(nsString& aName) const override;
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual LocalAccessible* ContainerWidget() const override;
+
+ protected:
+  ~XULAlertAccessible();
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULComboboxAccessible.cpp b/accessible/xul/XULComboboxAccessible.cpp
new file mode 100644
index 0000000000..2e22a33e51
--- /dev/null
+++ b/accessible/xul/XULComboboxAccessible.cpp
@@ -0,0 +1,142 @@
+/* -*- 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 "LocalAccessible-inl.h"
+#include "nsAccessibilityService.h"
+#include "DocAccessible.h"
+#include "nsCoreUtils.h"
+#include "mozilla/a11y/Role.h"
+#include "States.h"
+
+#include "mozilla/dom/Element.h"
+#include "nsIDOMXULMenuListElement.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULComboboxAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULComboboxAccessible::XULComboboxAccessible(nsIContent* aContent,
+                                             DocAccessible* aDoc)
+    : AccessibleWrap(aContent, aDoc) {
+  mGenericTypes |= eCombobox;
+}
+
+role XULComboboxAccessible::NativeRole() const { return roles::COMBOBOX; }
+
+uint64_t XULComboboxAccessible::NativeState() const {
+  // 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 = LocalAccessible::NativeState();
+
+  nsCOMPtr<nsIDOMXULMenuListElement> menuList = Elm()->AsXULMenuList();
+  if (menuList) {
+    bool isOpen = false;
+    menuList->GetOpen(&isOpen);
+    if (isOpen) {
+      state |= states::EXPANDED;
+    } else {
+      state |= states::COLLAPSED;
+    }
+  }
+
+  return state | states::HASPOPUP;
+}
+
+bool XULComboboxAccessible::IsAcceptableChild(nsIContent* aContent) const {
+  return AccessibleWrap::IsAcceptableChild(aContent) && !aContent->IsText();
+}
+
+void XULComboboxAccessible::Description(nsString& aDescription) const {
+  aDescription.Truncate();
+  // Use description of currently focused option
+  nsCOMPtr<nsIDOMXULMenuListElement> menuListElm = Elm()->AsXULMenuList();
+  if (!menuListElm) return;
+
+  nsCOMPtr<dom::Element> focusedOptionItem;
+  menuListElm->GetSelectedItem(getter_AddRefs(focusedOptionItem));
+  if (focusedOptionItem && mDoc) {
+    LocalAccessible* focusedOptionAcc = mDoc->GetAccessible(focusedOptionItem);
+    if (focusedOptionAcc) focusedOptionAcc->Description(aDescription);
+  }
+}
+
+void XULComboboxAccessible::Value(nsString& aValue) const {
+  aValue.Truncate();
+
+  // The value is the option or text shown entered in the combobox.
+  nsCOMPtr<nsIDOMXULMenuListElement> menuList = Elm()->AsXULMenuList();
+  if (menuList) menuList->GetLabel(aValue);
+}
+
+bool XULComboboxAccessible::HasPrimaryAction() const { return true; }
+
+bool XULComboboxAccessible::DoAction(uint8_t aIndex) const {
+  if (aIndex != XULComboboxAccessible::eAction_Click) return false;
+
+  // Programmaticaly toggle the combo box.
+  nsCOMPtr<nsIDOMXULMenuListElement> menuList = Elm()->AsXULMenuList();
+  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 = Elm()->AsXULMenuList();
+  if (!menuList) return;
+
+  bool isDroppedDown = false;
+  menuList->GetOpen(&isDroppedDown);
+  if (isDroppedDown) {
+    aName.AssignLiteral("close");
+  } else {
+    aName.AssignLiteral("open");
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Widgets
+
+bool XULComboboxAccessible::IsActiveWidget() const {
+  if (mContent->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::editable,
+                                         nsGkAtoms::_true, eIgnoreCase)) {
+    int32_t childCount = mChildren.Length();
+    for (int32_t idx = 0; idx < childCount; idx++) {
+      LocalAccessible* child = mChildren[idx];
+      if (child->Role() == roles::ENTRY) {
+        return FocusMgr()->HasDOMFocus(child->GetContent());
+      }
+    }
+    return false;
+  }
+
+  return FocusMgr()->HasDOMFocus(mContent);
+}
+
+bool XULComboboxAccessible::AreItemsOperable() const {
+  nsCOMPtr<nsIDOMXULMenuListElement> menuListElm = Elm()->AsXULMenuList();
+  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 0000000000..92f909690e
--- /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);
+
+  // LocalAccessible
+  void Description(nsString& aDescription) const override;
+  void Value(nsString& aValue) const override;
+  a11y::role NativeRole() const override;
+  uint64_t NativeState() const override;
+  bool IsAcceptableChild(nsIContent*) const override;
+
+  // ActionAccessible
+  bool HasPrimaryAction() const override;
+  void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  bool DoAction(uint8_t aIndex) const override;
+
+  // Widgets
+  bool IsActiveWidget() const override;
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY 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 0000000000..c999ffa468
--- /dev/null
+++ b/accessible/xul/XULElementAccessibles.cpp
@@ -0,0 +1,205 @@
+/* -*- 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 "LocalAccessible-inl.h"
+#include "BaseAccessibles.h"
+#include "DocAccessible-inl.h"
+#include "nsAccUtils.h"
+#include "nsCoreUtils.h"
+#include "nsTextEquivUtils.h"
+#include "Relation.h"
+#include "mozilla/a11y/Role.h"
+#include "States.h"
+#include "TextUpdater.h"
+
+#ifdef A11Y_LOG
+#  include "Logging.h"
+#endif
+
+#include "nsNameSpaceManager.h"
+#include "nsNetUtil.h"
+#include "nsString.h"
+#include "nsXULElement.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULLabelAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULLabelAccessible::XULLabelAccessible(nsIContent* aContent,
+                                       DocAccessible* aDoc)
+    : HyperTextAccessible(aContent, aDoc) {
+  mType = eXULLabelType;
+}
+
+void XULLabelAccessible::Shutdown() {
+  mValueTextLeaf = nullptr;
+  HyperTextAccessible::Shutdown();
+}
+
+void XULLabelAccessible::DispatchClickEvent(nsIContent* aContent,
+                                            uint32_t aActionIndex) const {
+  // Bug 1578140: For labels inside buttons, The base implementation of
+  // DispatchClickEvent doesn't fire a command event on the button.
+  RefPtr<nsXULElement> el = nsXULElement::FromNodeOrNull(aContent);
+  if (el) {
+    el->Click(mozilla::dom::CallerType::System);
+  }
+}
+
+ENameValueFlag XULLabelAccessible::NativeName(nsString& aName) const {
+  // 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 LocalAccessible::NativeName(aName);
+}
+
+role XULLabelAccessible::NativeRole() const { return roles::LABEL; }
+
+uint64_t XULLabelAccessible::NativeState() const {
+  // Labels and description have read only state
+  // They are not focusable or selectable
+  return HyperTextAccessible::NativeState() | states::READONLY;
+}
+
+Relation XULLabelAccessible::RelationByType(RelationType aType) const {
+  Relation rel = HyperTextAccessible::RelationByType(aType);
+
+  // The label for xul:groupbox is generated from the first xul:label
+  if (aType == RelationType::LABEL_FOR) {
+    LocalAccessible* parent = LocalParent();
+    if (parent && parent->Role() == roles::GROUPING &&
+        parent->LocalChildAt(0) == this) {
+      nsIContent* parentContent = parent->GetContent();
+      if (parentContent && parentContent->IsXULElement(nsGkAtoms::groupbox)) {
+        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() const { return roles::TEXT_LEAF; }
+
+uint64_t XULLabelTextLeafAccessible::NativeState() const {
+  return TextLeafAccessible::NativeState() | states::READONLY;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTooltipAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTooltipAccessible::XULTooltipAccessible(nsIContent* aContent,
+                                           DocAccessible* aDoc)
+    : LeafAccessible(aContent, aDoc) {
+  mType = eXULTooltipType;
+}
+
+uint64_t XULTooltipAccessible::NativeState() const {
+  return LeafAccessible::NativeState() | states::READONLY;
+}
+
+role XULTooltipAccessible::NativeRole() const { return roles::TOOLTIP; }
+
+////////////////////////////////////////////////////////////////////////////////
+// XULLinkAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULLinkAccessible::XULLinkAccessible(nsIContent* aContent, DocAccessible* aDoc)
+    : XULLabelAccessible(aContent, aDoc) {}
+
+XULLinkAccessible::~XULLinkAccessible() {}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULLinkAccessible: LocalAccessible
+
+void XULLinkAccessible::Value(nsString& aValue) const {
+  aValue.Truncate();
+
+  mContent->AsElement()->GetAttr(nsGkAtoms::href, aValue);
+}
+
+ENameValueFlag XULLinkAccessible::NativeName(nsString& aName) const {
+  mContent->AsElement()->GetAttr(nsGkAtoms::value, aName);
+  if (!aName.IsEmpty()) return eNameOK;
+
+  nsTextEquivUtils::GetNameFromSubtree(this, aName);
+  return aName.IsEmpty() ? eNameOK : eNameFromSubtree;
+}
+
+role XULLinkAccessible::NativeRole() const { return roles::LINK; }
+
+uint64_t XULLinkAccessible::NativeLinkState() const { return states::LINKED; }
+
+bool XULLinkAccessible::HasPrimaryAction() const { return true; }
+
+void XULLinkAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
+  aName.Truncate();
+
+  if (aIndex == eAction_Jump) aName.AssignLiteral("jump");
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULLinkAccessible: HyperLinkAccessible
+
+bool XULLinkAccessible::IsLink() const {
+  // 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 (LocalAccessible::IsLink()) return LocalAccessible::StartOffset();
+  return IndexInParent();
+}
+
+uint32_t XULLinkAccessible::EndOffset() {
+  if (LocalAccessible::IsLink()) return LocalAccessible::EndOffset();
+  return IndexInParent() + 1;
+}
+
+already_AddRefed<nsIURI> XULLinkAccessible::AnchorURIAt(
+    uint32_t aAnchorIndex) const {
+  if (aAnchorIndex != 0) return nullptr;
+
+  nsAutoString href;
+  mContent->AsElement()->GetAttr(nsGkAtoms::href, href);
+
+  dom::Document* document = mContent->OwnerDoc();
+
+  nsCOMPtr<nsIURI> anchorURI;
+  NS_NewURI(getter_AddRefs(anchorURI), href,
+            document->GetDocumentCharacterSet(), mContent->GetBaseURI());
+
+  return anchorURI.forget();
+}
diff --git a/accessible/xul/XULElementAccessibles.h b/accessible/xul/XULElementAccessibles.h
new file mode 100644
index 0000000000..a51b7c3951
--- /dev/null
+++ b/accessible/xul/XULElementAccessibles.h
@@ -0,0 +1,108 @@
+/* -*- 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 "HyperTextAccessible.h"
+#include "TextLeafAccessible.h"
+
+namespace mozilla {
+namespace a11y {
+
+class XULLabelTextLeafAccessible;
+
+/**
+ * Used for XUL description and label elements.
+ */
+class XULLabelAccessible : public HyperTextAccessible {
+ public:
+  XULLabelAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual void Shutdown() override;
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual Relation RelationByType(RelationType aType) const override;
+
+  void UpdateLabelValue(const nsString& aValue);
+
+ protected:
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+  virtual void DispatchClickEvent(nsIContent* aContent,
+                                  uint32_t aActionIndex) const override;
+
+ private:
+  RefPtr<XULLabelTextLeafAccessible> mValueTextLeaf;
+};
+
+inline XULLabelAccessible* LocalAccessible::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 TextLeafAccessible {
+ public:
+  XULLabelTextLeafAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : TextLeafAccessible(aContent, aDoc) {
+    mStateFlags |= eSharedNode;
+  }
+
+  virtual ~XULLabelTextLeafAccessible() {}
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+};
+
+/**
+ * Used for XUL tooltip element.
+ */
+class XULTooltipAccessible : public LeafAccessible {
+ public:
+  XULTooltipAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+};
+
+class XULLinkAccessible : public XULLabelAccessible {
+ public:
+  XULLinkAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual void Value(nsString& aValue) const override;
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeLinkState() const override;
+
+  // ActionAccessible
+  virtual bool HasPrimaryAction() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+
+  // HyperLinkAccessible
+  virtual bool IsLink() const override;
+  virtual uint32_t StartOffset() override;
+  virtual uint32_t EndOffset() override;
+  virtual already_AddRefed<nsIURI> AnchorURIAt(
+      uint32_t aAnchorIndex) const override;
+
+ protected:
+  virtual ~XULLinkAccessible();
+
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const 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 0000000000..038f93dd68
--- /dev/null
+++ b/accessible/xul/XULFormControlAccessible.cpp
@@ -0,0 +1,446 @@
+/* -*- 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 "LocalAccessible-inl.h"
+#include "HTMLFormControlAccessible.h"
+#include "nsAccUtils.h"
+#include "DocAccessible.h"
+#include "Relation.h"
+#include "mozilla/a11y/Role.h"
+#include "States.h"
+#include "TreeWalker.h"
+#include "XULMenuAccessible.h"
+
+#include "nsIDOMXULButtonElement.h"
+#include "nsIDOMXULMenuListElement.h"
+#include "nsIDOMXULRadioGroupElement.h"
+#include "nsIDOMXULSelectCntrlItemEl.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
+
+////////////////////////////////////////////////////////////////////////////////
+// XULButtonAccessible: nsIAccessible
+
+bool XULButtonAccessible::HasPrimaryAction() const { return true; }
+
+void XULButtonAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
+  if (aIndex == eAction_Click) aName.AssignLiteral("press");
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULButtonAccessible: LocalAccessible
+
+role XULButtonAccessible::NativeRole() const {
+  // Buttons can be checked; they simply appear pressed in rather than checked.
+  // In this case, we must expose them as toggle buttons.
+  nsCOMPtr<nsIDOMXULButtonElement> xulButtonElement = Elm()->AsXULButton();
+  if (xulButtonElement) {
+    nsAutoString type;
+    xulButtonElement->GetType(type);
+    if (type.EqualsLiteral("checkbox") || type.EqualsLiteral("radio")) {
+      return roles::TOGGLE_BUTTON;
+    }
+  }
+  return roles::PUSHBUTTON;
+}
+
+uint64_t XULButtonAccessible::NativeState() const {
+  // Possible states: focused, focusable, unavailable(disabled).
+
+  // get focus and disable status from base class
+  uint64_t state = LocalAccessible::NativeState();
+
+  nsCOMPtr<nsIDOMXULButtonElement> xulButtonElement = Elm()->AsXULButton();
+  if (xulButtonElement) {
+    // Some buttons can have their checked state set without being of type
+    // checkbox or radio. Expose the pressed state unconditionally.
+    bool checked = false;
+    xulButtonElement->GetChecked(&checked);
+    if (checked) {
+      state |= states::PRESSED;
+    }
+  }
+
+  if (ContainsMenu()) state |= states::HASPOPUP;
+
+  if (mContent->AsElement()->HasAttr(nsGkAtoms::_default)) {
+    state |= states::DEFAULT;
+  }
+
+  return state;
+}
+
+bool XULButtonAccessible::AttributeChangesState(nsAtom* aAttribute) {
+  if (aAttribute == nsGkAtoms::checked) {
+    return true;
+  }
+  return AccessibleWrap::AttributeChangesState(aAttribute);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULButtonAccessible: Widgets
+
+bool XULButtonAccessible::IsWidget() const { return true; }
+
+bool XULButtonAccessible::IsActiveWidget() const {
+  return FocusMgr()->HasDOMFocus(mContent);
+}
+
+bool XULButtonAccessible::AreItemsOperable() const {
+  if (IsMenuButton()) {
+    LocalAccessible* menuPopup = mChildren.SafeElementAt(0, nullptr);
+    if (menuPopup) {
+      nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(menuPopup->GetFrame());
+      return menuPopupFrame->IsOpen();
+    }
+  }
+  return false;  // no items
+}
+
+bool XULButtonAccessible::IsAcceptableChild(nsIContent* aEl) const {
+  // In general XUL buttons should not have accessible children. However:
+  return
+      //   menu buttons can have popup accessibles (@type="menu" or
+      //   columnpicker).
+      aEl->IsXULElement(nsGkAtoms::menupopup) ||
+      // A XUL button can be labelled by a direct child text node, so we need to
+      // allow that as a child so it will be picked up when computing name from
+      // subtree.
+      (aEl->IsText() && aEl->GetParent() == mContent);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULButtonAccessible protected
+
+bool XULButtonAccessible::ContainsMenu() const {
+  return mContent->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
+                                            nsGkAtoms::menu, eCaseMatters);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULDropmarkerAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULDropmarkerAccessible::XULDropmarkerAccessible(nsIContent* aContent,
+                                                 DocAccessible* aDoc)
+    : LeafAccessible(aContent, aDoc) {}
+
+bool XULDropmarkerAccessible::HasPrimaryAction() const { return true; }
+
+bool XULDropmarkerAccessible::DropmarkerOpen(bool aToggleOpen) const {
+  bool isOpen = false;
+
+  nsIContent* parent = mContent->GetFlattenedTreeParent();
+
+  while (parent) {
+    nsCOMPtr<nsIDOMXULButtonElement> parentButtonElement =
+        parent->AsElement()->AsXULButton();
+    if (parentButtonElement) {
+      parentButtonElement->GetOpen(&isOpen);
+      if (aToggleOpen) parentButtonElement->SetOpen(!isOpen);
+      return isOpen;
+    }
+
+    nsCOMPtr<nsIDOMXULMenuListElement> parentMenuListElement =
+        parent->AsElement()->AsXULMenuList();
+    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) const {
+  if (index == eAction_Click) {
+    DropmarkerOpen(true);  // Reverse the open attribute
+    return true;
+  }
+  return false;
+}
+
+role XULDropmarkerAccessible::NativeRole() const { return roles::PUSHBUTTON; }
+
+uint64_t XULDropmarkerAccessible::NativeState() const {
+  return DropmarkerOpen(false) ? states::PRESSED : 0;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULGroupboxAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULGroupboxAccessible::XULGroupboxAccessible(nsIContent* aContent,
+                                             DocAccessible* aDoc)
+    : AccessibleWrap(aContent, aDoc) {}
+
+role XULGroupboxAccessible::NativeRole() const { return roles::GROUPING; }
+
+ENameValueFlag XULGroupboxAccessible::NativeName(nsString& aName) const {
+  // XXX: we use the first related accessible only.
+  LocalAccessible* label =
+      RelationByType(RelationType::LABELLED_BY).LocalNext();
+  if (label) return label->Name(aName);
+
+  return eNameOK;
+}
+
+Relation XULGroupboxAccessible::RelationByType(RelationType aType) const {
+  Relation rel = AccessibleWrap::RelationByType(aType);
+
+  // The label for xul:groupbox is generated from the first xul:label
+  if (aType == RelationType::LABELLED_BY && ChildCount() > 0) {
+    LocalAccessible* childAcc = LocalChildAt(0);
+    if (childAcc->Role() == roles::LABEL &&
+        childAcc->GetContent()->IsXULElement(nsGkAtoms::label)) {
+      rel.AppendTarget(childAcc);
+    }
+  }
+
+  return rel;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULRadioButtonAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULRadioButtonAccessible::XULRadioButtonAccessible(nsIContent* aContent,
+                                                   DocAccessible* aDoc)
+    : RadioButtonAccessible(aContent, aDoc) {}
+
+uint64_t XULRadioButtonAccessible::NativeState() const {
+  uint64_t state = LeafAccessible::NativeState();
+  state |= states::CHECKABLE;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> radioButton =
+      Elm()->AsXULSelectControlItem();
+  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
+
+LocalAccessible* 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() const { 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; }
+
+LocalAccessible* XULRadioGroupAccessible::CurrentItem() const {
+  if (!mSelectControl) {
+    return nullptr;
+  }
+
+  RefPtr<dom::Element> currentItemElm;
+  nsCOMPtr<nsIDOMXULRadioGroupElement> group =
+      mSelectControl->AsXULRadioGroup();
+  if (group) {
+    group->GetFocusedItem(getter_AddRefs(currentItemElm));
+  }
+
+  if (currentItemElm) {
+    DocAccessible* document = Document();
+    if (document) {
+      return document->GetAccessible(currentItemElm);
+    }
+  }
+
+  return nullptr;
+}
+
+void XULRadioGroupAccessible::SetCurrentItem(const LocalAccessible* aItem) {
+  if (!mSelectControl) {
+    return;
+  }
+
+  nsCOMPtr<dom::Element> itemElm = aItem->Elm();
+  nsCOMPtr<nsIDOMXULRadioGroupElement> group =
+      mSelectControl->AsXULRadioGroup();
+  if (group) {
+    group->SetFocusedItem(itemElm);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULStatusBarAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULStatusBarAccessible::XULStatusBarAccessible(nsIContent* aContent,
+                                               DocAccessible* aDoc)
+    : AccessibleWrap(aContent, aDoc) {}
+
+role XULStatusBarAccessible::NativeRole() const { return roles::STATUSBAR; }
+
+////////////////////////////////////////////////////////////////////////////////
+// XULToolbarButtonAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULToolbarButtonAccessible::XULToolbarButtonAccessible(nsIContent* aContent,
+                                                       DocAccessible* aDoc)
+    : XULButtonAccessible(aContent, aDoc) {}
+
+void XULToolbarButtonAccessible::GetPositionAndSetSize(int32_t* aPosInSet,
+                                                       int32_t* aSetSize) {
+  int32_t setSize = 0;
+  int32_t posInSet = 0;
+
+  LocalAccessible* parent = LocalParent();
+  if (!parent) return;
+
+  uint32_t childCount = parent->ChildCount();
+  for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
+    LocalAccessible* child = parent->LocalChildAt(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(LocalAccessible* aAccessible) {
+  nsIContent* content = aAccessible->GetContent();
+  return content && content->IsAnyOfXULElements(nsGkAtoms::toolbarseparator,
+                                                nsGkAtoms::toolbarspacer,
+                                                nsGkAtoms::toolbarspring);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULToolbarButtonAccessible: Widgets
+
+bool XULToolbarButtonAccessible::IsAcceptableChild(nsIContent* aEl) const {
+  return XULButtonAccessible::IsAcceptableChild(aEl) ||
+         // In addition to the children allowed by buttons, toolbarbuttons can
+         // have labels as children, but only if the label attribute is not
+         // present.
+         (aEl->IsXULElement(nsGkAtoms::label) &&
+          !mContent->AsElement()->HasAttr(nsGkAtoms::label));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULToolbarAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULToolbarAccessible::XULToolbarAccessible(nsIContent* aContent,
+                                           DocAccessible* aDoc)
+    : AccessibleWrap(aContent, aDoc) {}
+
+role XULToolbarAccessible::NativeRole() const { return roles::TOOLBAR; }
+
+ENameValueFlag XULToolbarAccessible::NativeName(nsString& aName) const {
+  if (mContent->AsElement()->GetAttr(nsGkAtoms::toolbarname, aName)) {
+    aName.CompressWhitespace();
+  }
+
+  return eNameOK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULToolbarAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULToolbarSeparatorAccessible::XULToolbarSeparatorAccessible(
+    nsIContent* aContent, DocAccessible* aDoc)
+    : LeafAccessible(aContent, aDoc) {}
+
+role XULToolbarSeparatorAccessible::NativeRole() const {
+  return roles::SEPARATOR;
+}
+
+uint64_t XULToolbarSeparatorAccessible::NativeState() const { return 0; }
diff --git a/accessible/xul/XULFormControlAccessible.h b/accessible/xul/XULFormControlAccessible.h
new file mode 100644
index 0000000000..4eda16c7e9
--- /dev/null
+++ b/accessible/xul/XULFormControlAccessible.h
@@ -0,0 +1,186 @@
+/* -*- 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 "HyperTextAccessible.h"
+#include "XULSelectControlAccessible.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * 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_INLINE_DECL_REFCOUNTING_INHERITED(XULButtonAccessible, AccessibleWrap)
+
+  // LocalAccessible
+  virtual mozilla::a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual bool AttributeChangesState(nsAtom* aAttribute) override;
+
+  // ActionAccessible
+  virtual bool HasPrimaryAction() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+
+  virtual bool IsAcceptableChild(nsIContent* aEl) const override;
+
+ protected:
+  virtual ~XULButtonAccessible();
+
+  // XULButtonAccessible
+  bool ContainsMenu() const;
+};
+
+/**
+ * Used for XUL dropmarker element.
+ */
+class XULDropmarkerAccessible : public LeafAccessible {
+ public:
+  enum { eAction_Click = 0 };
+  XULDropmarkerAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual mozilla::a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+
+  // ActionAccessible
+  virtual bool HasPrimaryAction() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) const override;
+
+ private:
+  bool DropmarkerOpen(bool aToggleOpen) const;
+};
+
+/**
+ * Used for XUL groupbox element.
+ */
+class XULGroupboxAccessible final : public AccessibleWrap {
+ public:
+  XULGroupboxAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual mozilla::a11y::role NativeRole() const override;
+  virtual Relation RelationByType(RelationType aType) const override;
+
+ protected:
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+};
+
+/**
+ * Used for XUL radio element (radio button).
+ */
+class XULRadioButtonAccessible : public RadioButtonAccessible {
+ public:
+  XULRadioButtonAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual uint64_t NativeState() const override;
+  virtual uint64_t NativeInteractiveState() const override;
+
+  // Widgets
+  virtual LocalAccessible* ContainerWidget() const override;
+};
+
+/**
+ * Used for XUL radiogroup element.
+ */
+class XULRadioGroupAccessible : public XULSelectControlAccessible {
+ public:
+  XULRadioGroupAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual mozilla::a11y::role NativeRole() const override;
+  virtual uint64_t NativeInteractiveState() const override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+  virtual LocalAccessible* CurrentItem() const override;
+  virtual void SetCurrentItem(const LocalAccessible* aItem) override;
+};
+
+/**
+ * Used for XUL statusbar element.
+ */
+class XULStatusBarAccessible : public AccessibleWrap {
+ public:
+  XULStatusBarAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual mozilla::a11y::role NativeRole() const override;
+};
+
+/**
+ * Used for XUL toolbarbutton element.
+ */
+class XULToolbarButtonAccessible : public XULButtonAccessible {
+ public:
+  XULToolbarButtonAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // nsXULToolbarButtonAccessible
+  static bool IsSeparator(LocalAccessible* aAccessible);
+
+  // Widgets
+  virtual bool IsAcceptableChild(nsIContent* aEl) const override;
+
+ protected:
+  // LocalAccessible
+  virtual void GetPositionAndSetSize(int32_t* aPosInSet,
+                                     int32_t* aSetSize) override;
+};
+
+/**
+ * Used for XUL toolbar element.
+ */
+class XULToolbarAccessible : public AccessibleWrap {
+ public:
+  XULToolbarAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual mozilla::a11y::role NativeRole() const override;
+
+ protected:
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+};
+
+/**
+ * Used for XUL toolbarseparator element.
+ */
+class XULToolbarSeparatorAccessible : public LeafAccessible {
+ public:
+  XULToolbarSeparatorAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual mozilla::a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULListboxAccessible.cpp b/accessible/xul/XULListboxAccessible.cpp
new file mode 100644
index 0000000000..d80bac1ca0
--- /dev/null
+++ b/accessible/xul/XULListboxAccessible.cpp
@@ -0,0 +1,456 @@
+/* -*- 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 "LocalAccessible-inl.h"
+#include "nsAccessibilityService.h"
+#include "nsAccUtils.h"
+#include "DocAccessible.h"
+#include "mozilla/a11y/Role.h"
+#include "States.h"
+
+#include "nsComponentManagerUtils.h"
+#include "nsIAutoCompletePopup.h"
+#include "nsIDOMXULMenuListElement.h"
+#include "nsIDOMXULMultSelectCntrlEl.h"
+#include "nsIDOMXULSelectCntrlItemEl.h"
+#include "nsINodeList.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULColumAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULColumAccessible::XULColumAccessible(nsIContent* aContent,
+                                       DocAccessible* aDoc)
+    : AccessibleWrap(aContent, aDoc) {}
+
+role XULColumAccessible::NativeRole() const { return roles::LIST; }
+
+uint64_t XULColumAccessible::NativeState() const { return states::READONLY; }
+
+////////////////////////////////////////////////////////////////////////////////
+// XULColumnItemAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULColumnItemAccessible::XULColumnItemAccessible(nsIContent* aContent,
+                                                 DocAccessible* aDoc)
+    : LeafAccessible(aContent, aDoc) {}
+
+role XULColumnItemAccessible::NativeRole() const { return roles::COLUMNHEADER; }
+
+uint64_t XULColumnItemAccessible::NativeState() const {
+  return states::READONLY;
+}
+
+bool XULColumnItemAccessible::HasPrimaryAction() const { return true; }
+
+void XULColumnItemAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
+  if (aIndex == eAction_Click) aName.AssignLiteral("click");
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListboxAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULListboxAccessible::XULListboxAccessible(nsIContent* aContent,
+                                           DocAccessible* aDoc)
+    : XULSelectControlAccessible(aContent, aDoc) {
+  dom::Element* parentEl = mContent->GetParentElement();
+  if (parentEl) {
+    nsCOMPtr<nsIAutoCompletePopup> autoCompletePopupElm =
+        parentEl->AsAutoCompletePopup();
+    if (autoCompletePopupElm) mGenericTypes |= eAutoCompletePopup;
+  }
+
+  if (IsMulticolumn()) mGenericTypes |= eTable;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListboxAccessible: LocalAccessible
+
+uint64_t XULListboxAccessible::NativeState() const {
+  // As a XULListboxAccessible we can have the following states:
+  //   FOCUSED, READONLY, FOCUSABLE
+
+  // Get focus status from base class
+  uint64_t states = LocalAccessible::NativeState();
+
+  // see if we are multiple select if so set ourselves as such
+
+  if (mContent->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::seltype,
+                                         nsGkAtoms::multiple, eCaseMatters)) {
+    states |= states::MULTISELECTABLE | states::EXTSELECTABLE;
+  }
+
+  return states;
+}
+
+role XULListboxAccessible::NativeRole() const {
+  // A richlistbox is used with the new autocomplete URL bar, and has a parent
+  // popup <panel>.
+  if (mContent->GetParent() &&
+      mContent->GetParent()->IsXULElement(nsGkAtoms::panel)) {
+    return roles::COMBOBOX_LIST;
+  }
+
+  return IsMulticolumn() ? roles::TABLE : roles::LISTBOX;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListboxAccessible: Table
+
+uint32_t XULListboxAccessible::ColCount() const { return 0; }
+
+uint32_t XULListboxAccessible::RowCount() {
+  nsCOMPtr<nsIDOMXULSelectControlElement> element = Elm()->AsXULSelectControl();
+
+  uint32_t itemCount = 0;
+  if (element) element->GetItemCount(&itemCount);
+
+  return itemCount;
+}
+
+LocalAccessible* XULListboxAccessible::CellAt(uint32_t aRowIndex,
+                                              uint32_t aColumnIndex) {
+  nsCOMPtr<nsIDOMXULSelectControlElement> control = Elm()->AsXULSelectControl();
+  NS_ENSURE_TRUE(control, nullptr);
+
+  RefPtr<dom::Element> element;
+  control->GetItemAtIndex(aRowIndex, getter_AddRefs(element));
+  if (!element) return nullptr;
+
+  LocalAccessible* row = mDoc->GetAccessible(element);
+  NS_ENSURE_TRUE(row, nullptr);
+
+  return row->LocalChildAt(aColumnIndex);
+}
+
+bool XULListboxAccessible::IsColSelected(uint32_t aColIdx) {
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+      Elm()->AsXULMultiSelectControl();
+  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 = Elm()->AsXULSelectControl();
+  NS_ASSERTION(control, "Doesn't implement nsIDOMXULSelectControlElement.");
+
+  RefPtr<dom::Element> element;
+  nsresult rv = control->GetItemAtIndex(aRowIdx, getter_AddRefs(element));
+  NS_ENSURE_SUCCESS(rv, false);
+  if (!element) {
+    return false;
+  }
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> item =
+      element->AsXULSelectControlItem();
+
+  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 =
+      Elm()->AsXULMultiSelectControl();
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  nsCOMPtr<nsINodeList> selectedItems;
+  control->GetSelectedItems(getter_AddRefs(selectedItems));
+  if (!selectedItems) return 0;
+
+  uint32_t selectedItemsCount = selectedItems->Length();
+
+  return selectedItemsCount * ColCount();
+}
+
+uint32_t XULListboxAccessible::SelectedColCount() {
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+      Elm()->AsXULMultiSelectControl();
+  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 =
+      Elm()->AsXULMultiSelectControl();
+  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 =
+      Elm()->AsXULMultiSelectControl();
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  nsCOMPtr<nsINodeList> selectedItems;
+  control->GetSelectedItems(getter_AddRefs(selectedItems));
+  if (!selectedItems) return;
+
+  uint32_t selectedItemsCount = selectedItems->Length();
+
+  for (uint32_t index = 0; index < selectedItemsCount; index++) {
+    nsIContent* itemContent = selectedItems->Item(index);
+    LocalAccessible* item = mDoc->GetAccessible(itemContent);
+
+    if (item) {
+      uint32_t cellCount = item->ChildCount();
+      for (uint32_t cellIdx = 0; cellIdx < cellCount; cellIdx++) {
+        LocalAccessible* cell = mChildren[cellIdx];
+        if (cell->Role() == roles::CELL) aCells->AppendElement(cell);
+      }
+    }
+  }
+}
+
+void XULListboxAccessible::SelectedCellIndices(nsTArray<uint32_t>* aCells) {
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
+      Elm()->AsXULMultiSelectControl();
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  nsCOMPtr<nsINodeList> selectedItems;
+  control->GetSelectedItems(getter_AddRefs(selectedItems));
+  if (!selectedItems) return;
+
+  uint32_t selectedItemsCount = selectedItems->Length();
+
+  uint32_t colCount = ColCount();
+  aCells->SetCapacity(selectedItemsCount * colCount);
+  aCells->AppendElements(selectedItemsCount * colCount);
+
+  for (uint32_t selItemsIdx = 0, cellsIdx = 0; selItemsIdx < selectedItemsCount;
+       selItemsIdx++) {
+    nsIContent* itemContent = selectedItems->Item(selItemsIdx);
+
+    nsCOMPtr<nsIDOMXULSelectControlItemElement> item =
+        itemContent->AsElement()->AsXULSelectControlItem();
+    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 =
+      Elm()->AsXULMultiSelectControl();
+  NS_ASSERTION(control,
+               "Doesn't implement nsIDOMXULMultiSelectControlElement.");
+
+  nsCOMPtr<nsINodeList> selectedItems;
+  control->GetSelectedItems(getter_AddRefs(selectedItems));
+  if (!selectedItems) return;
+
+  uint32_t rowCount = selectedItems->Length();
+
+  if (!rowCount) return;
+
+  aRows->SetCapacity(rowCount);
+  aRows->AppendElements(rowCount);
+
+  for (uint32_t rowIdx = 0; rowIdx < rowCount; rowIdx++) {
+    nsIContent* itemContent = selectedItems->Item(rowIdx);
+    nsCOMPtr<nsIDOMXULSelectControlItemElement> item =
+        itemContent->AsElement()->AsXULSelectControlItem();
+
+    if (item) {
+      int32_t itemIdx = -1;
+      control->GetIndexOfItem(item, &itemIdx);
+      if (itemIdx >= 0) aRows->ElementAt(rowIdx) = itemIdx;
+    }
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListboxAccessible: Widgets
+
+bool XULListboxAccessible::IsWidget() const { return true; }
+
+bool XULListboxAccessible::IsActiveWidget() const {
+  if (IsAutoCompletePopup()) {
+    nsIContent* parentContent = mContent->GetParent();
+    if (parentContent) {
+      nsCOMPtr<nsIAutoCompletePopup> autoCompletePopupElm =
+          parentContent->AsElement()->AsAutoCompletePopup();
+      if (autoCompletePopupElm) {
+        bool isOpen = false;
+        autoCompletePopupElm->GetPopupOpen(&isOpen);
+        return isOpen;
+      }
+    }
+  }
+  return FocusMgr()->HasDOMFocus(mContent);
+}
+
+bool XULListboxAccessible::AreItemsOperable() const {
+  if (IsAutoCompletePopup()) {
+    nsIContent* parentContent = mContent->GetParent();
+    if (parentContent) {
+      nsCOMPtr<nsIAutoCompletePopup> autoCompletePopupElm =
+          parentContent->AsElement()->AsAutoCompletePopup();
+      if (autoCompletePopupElm) {
+        bool isOpen = false;
+        autoCompletePopupElm->GetPopupOpen(&isOpen);
+        return isOpen;
+      }
+    }
+  }
+  return true;
+}
+
+LocalAccessible* XULListboxAccessible::ContainerWidget() const {
+  return nullptr;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListitemAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULListitemAccessible::XULListitemAccessible(nsIContent* aContent,
+                                             DocAccessible* aDoc)
+    : XULMenuitemAccessible(aContent, aDoc) {
+  mIsCheckbox = mContent->AsElement()->AttrValueIs(
+      kNameSpaceID_None, nsGkAtoms::type, nsGkAtoms::checkbox, eCaseMatters);
+  mType = eXULListItemType;
+}
+
+XULListitemAccessible::~XULListitemAccessible() {}
+
+LocalAccessible* XULListitemAccessible::GetListAccessible() const {
+  if (IsDefunct()) return nullptr;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> listItem =
+      Elm()->AsXULSelectControlItem();
+  if (!listItem) return nullptr;
+
+  RefPtr<dom::Element> listElement;
+  listItem->GetControl(getter_AddRefs(listElement));
+  if (!listElement) return nullptr;
+
+  return mDoc->GetAccessible(listElement);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListitemAccessible LocalAccessible
+
+void XULListitemAccessible::Description(nsString& aDesc) const {
+  AccessibleWrap::Description(aDesc);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULListitemAccessible: LocalAccessible
+
+/**
+ * Get the name from GetXULName.
+ */
+ENameValueFlag XULListitemAccessible::NativeName(nsString& aName) const {
+  return LocalAccessible::NativeName(aName);
+}
+
+role XULListitemAccessible::NativeRole() const {
+  LocalAccessible* 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() const {
+  if (mIsCheckbox) return XULMenuitemAccessible::NativeState();
+
+  uint64_t states = NativeInteractiveState();
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> listItem =
+      Elm()->AsXULSelectControlItem();
+  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
+
+LocalAccessible* XULListitemAccessible::ContainerWidget() const {
+  return LocalParent();
+}
diff --git a/accessible/xul/XULListboxAccessible.h b/accessible/xul/XULListboxAccessible.h
new file mode 100644
index 0000000000..2745b323d0
--- /dev/null
+++ b/accessible/xul/XULListboxAccessible.h
@@ -0,0 +1,136 @@
+/* -*- 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 "mozilla/a11y/TableAccessible.h"
+#include "XULMenuAccessible.h"
+#include "XULSelectControlAccessible.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * XULColumAccessible are accessible for list and tree columns elements
+ * (xul:treecols and xul:listheader).
+ */
+class XULColumAccessible : public AccessibleWrap {
+ public:
+  XULColumAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+};
+
+/**
+ * XULColumnItemAccessible are accessibles for list and tree column elements
+ * (xul:treecol).
+ */
+class XULColumnItemAccessible : public LeafAccessible {
+ public:
+  XULColumnItemAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+
+  // ActionAccessible
+  virtual bool HasPrimaryAction() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) 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() const override;
+  virtual uint32_t RowCount() override;
+  virtual LocalAccessible* 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 LocalAccessible* AsAccessible() override { return this; }
+
+  // LocalAccessible
+  virtual TableAccessible* AsTable() override { return this; }
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+
+  virtual LocalAccessible* ContainerWidget() const override;
+
+ protected:
+  virtual ~XULListboxAccessible() {}
+
+  bool IsMulticolumn() const { return ColCount() > 1; }
+};
+
+/**
+ * Listitems -- used in listboxes
+ */
+class XULListitemAccessible : public XULMenuitemAccessible {
+ public:
+  enum { eAction_Click = 0 };
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(XULListitemAccessible,
+                                       XULMenuitemAccessible)
+
+  XULListitemAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual void Description(nsString& aDesc) const override;
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual uint64_t NativeInteractiveState() const override;
+
+  // Actions
+  virtual void ActionNameAt(uint8_t index, nsAString& aName) override;
+
+  // Widgets
+  virtual LocalAccessible* ContainerWidget() const override;
+
+ protected:
+  virtual ~XULListitemAccessible();
+
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+
+  // XULListitemAccessible
+
+  /**
+   * Return listbox accessible for the listitem.
+   */
+  LocalAccessible* GetListAccessible() const;
+
+ private:
+  bool mIsCheckbox;
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULMenuAccessible.cpp b/accessible/xul/XULMenuAccessible.cpp
new file mode 100644
index 0000000000..6628304a9e
--- /dev/null
+++ b/accessible/xul/XULMenuAccessible.cpp
@@ -0,0 +1,477 @@
+/* -*- 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 "LocalAccessible-inl.h"
+#include "XULMenuBarElement.h"
+#include "XULMenuParentElement.h"
+#include "XULPopupElement.h"
+#include "mozilla/Assertions.h"
+#include "nsAccessibilityService.h"
+#include "nsAccUtils.h"
+#include "DocAccessible.h"
+#include "mozilla/a11y/Role.h"
+#include "States.h"
+#include "XULFormControlAccessible.h"
+
+#include "nsIContentInlines.h"
+#include "nsIDOMXULContainerElement.h"
+#include "nsIDOMXULSelectCntrlEl.h"
+#include "nsIDOMXULSelectCntrlItemEl.h"
+#include "nsIContent.h"
+#include "nsMenuPopupFrame.h"
+
+#include "mozilla/Preferences.h"
+#include "mozilla/LookAndFeel.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/XULButtonElement.h"
+#include "mozilla/dom/KeyboardEventBinding.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenuitemAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULMenuitemAccessible::XULMenuitemAccessible(nsIContent* aContent,
+                                             DocAccessible* aDoc)
+    : AccessibleWrap(aContent, aDoc) {}
+
+uint64_t XULMenuitemAccessible::NativeState() const {
+  uint64_t state = LocalAccessible::NativeState();
+
+  // Has Popup?
+  if (mContent->NodeInfo()->Equals(nsGkAtoms::menu, kNameSpaceID_XUL)) {
+    state |= states::HASPOPUP;
+    if (mContent->AsElement()->HasAttr(nsGkAtoms::open)) {
+      state |= states::EXPANDED;
+    } else {
+      state |= states::COLLAPSED;
+    }
+  }
+
+  // Checkable/checked?
+  static dom::Element::AttrValuesArray strings[] = {
+      nsGkAtoms::radio, nsGkAtoms::checkbox, nullptr};
+
+  if (mContent->AsElement()->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::type,
+                                             strings, eCaseMatters) >= 0) {
+    // Checkable?
+    state |= states::CHECKABLE;
+
+    // Checked?
+    if (mContent->AsElement()->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 =
+        Elm()->AsXULSelectControlItem();
+    NS_ENSURE_TRUE(item, state);
+    item->GetSelected(&isSelected);
+
+    // Is collapsed?
+    bool isCollapsed = false;
+    LocalAccessible* parent = LocalParent();
+    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
+        LocalAccessible* grandParent = parent->LocalParent();
+        if (!grandParent) return state;
+        NS_ASSERTION(grandParent->IsCombobox(),
+                     "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.
+    auto* button = dom::XULButtonElement::FromNode(GetContent());
+    bool skipNavigatingDisabledMenuItem = true;
+    if (!button || !button->IsOnMenuBar()) {
+      skipNavigatingDisabledMenuItem = LookAndFeel::GetInt(
+          LookAndFeel::IntID::SkipNavigatingDisabledMenuItem);
+    }
+
+    if (skipNavigatingDisabledMenuItem) return states::UNAVAILABLE;
+
+    return states::UNAVAILABLE | states::FOCUSABLE | states::SELECTABLE;
+  }
+
+  return states::FOCUSABLE | states::SELECTABLE;
+}
+
+ENameValueFlag XULMenuitemAccessible::NativeName(nsString& aName) const {
+  mContent->AsElement()->GetAttr(nsGkAtoms::label, aName);
+  return eNameOK;
+}
+
+void XULMenuitemAccessible::Description(nsString& aDescription) const {
+  mContent->AsElement()->GetAttr(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->AsElement()->GetAttr(nsGkAtoms::accesskey, accesskey);
+  if (accesskey.IsEmpty()) return KeyBinding();
+
+  uint32_t modifierKey = 0;
+
+  LocalAccessible* parentAcc = LocalParent();
+  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 dom::KeyboardEvent_Binding::DOM_VK_CONTROL:
+          modifierKey = KeyBinding::kControl;
+          break;
+        case dom::KeyboardEvent_Binding::DOM_VK_ALT:
+          modifierKey = KeyBinding::kAlt;
+          break;
+        case dom::KeyboardEvent_Binding::DOM_VK_META:
+        case dom::KeyboardEvent_Binding::DOM_VK_WIN:
+          modifierKey = KeyBinding::kMeta;
+          break;
+      }
+    }
+  }
+
+  return KeyBinding(accesskey[0], modifierKey);
+}
+
+KeyBinding XULMenuitemAccessible::KeyboardShortcut() const {
+  nsAutoString keyElmId;
+  mContent->AsElement()->GetAttr(nsGkAtoms::key, keyElmId);
+  if (keyElmId.IsEmpty()) return KeyBinding();
+
+  dom::Element* keyElm = mContent->OwnerDoc()->GetElementById(keyElmId);
+  if (!keyElm) return KeyBinding();
+
+  uint32_t key = 0;
+
+  nsAutoString keyStr;
+  keyElm->GetAttr(nsGkAtoms::key, keyStr);
+  if (keyStr.IsEmpty()) {
+    nsAutoString keyCodeStr;
+    keyElm->GetAttr(nsGkAtoms::keycode, keyCodeStr);
+    nsresult errorCode;
+    key = keyStr.ToInteger(&errorCode, /* aRadix = */ 10);
+    if (NS_FAILED(errorCode)) {
+      key = keyStr.ToInteger(&errorCode, /* aRadix = */ 16);
+    }
+  } else {
+    key = keyStr[0];
+  }
+
+  nsAutoString modifiersStr;
+  keyElm->GetAttr(nsGkAtoms::modifiers, modifiersStr);
+
+  uint32_t modifierMask = 0;
+  if (modifiersStr.Find(u"shift") != -1) modifierMask |= KeyBinding::kShift;
+  if (modifiersStr.Find(u"alt") != -1) modifierMask |= KeyBinding::kAlt;
+  if (modifiersStr.Find(u"meta") != -1) modifierMask |= KeyBinding::kMeta;
+  if (modifiersStr.Find(u"control") != -1) modifierMask |= KeyBinding::kControl;
+  if (modifiersStr.Find(u"accel") != -1) {
+    modifierMask |= KeyBinding::AccelModifier();
+  }
+
+  return KeyBinding(key, modifierMask);
+}
+
+role XULMenuitemAccessible::NativeRole() const {
+  nsCOMPtr<nsIDOMXULContainerElement> xulContainer = Elm()->AsXULContainer();
+  if (xulContainer) return roles::PARENT_MENUITEM;
+
+  LocalAccessible* widget = ContainerWidget();
+  if (widget && widget->Role() == roles::COMBOBOX_LIST) {
+    return roles::COMBOBOX_OPTION;
+  }
+
+  if (mContent->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
+                                         nsGkAtoms::radio, eCaseMatters)) {
+    return roles::RADIO_MENU_ITEM;
+  }
+
+  if (mContent->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
+                                         nsGkAtoms::checkbox, eCaseMatters)) {
+    return roles::CHECK_MENU_ITEM;
+  }
+
+  return roles::MENUITEM;
+}
+
+int32_t XULMenuitemAccessible::GetLevel(bool aFast) const {
+  return nsAccUtils::GetLevelForXULContainerItem(mContent);
+}
+
+void XULMenuitemAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
+  if (aIndex == eAction_Click) aName.AssignLiteral("click");
+}
+
+bool XULMenuitemAccessible::HasPrimaryAction() const { return true; }
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenuitemAccessible: Widgets
+
+bool XULMenuitemAccessible::IsActiveWidget() const {
+  // Parent menu item is a widget, it's active when its popup is open.
+  // Typically the <menupopup> is included in the document markup, and
+  // <menu> prepends content in front of it.
+  nsIContent* menuPopupContent = mContent->GetLastChild();
+  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->GetLastChild();
+  if (menuPopupContent) {
+    nsMenuPopupFrame* menuPopupFrame =
+        do_QueryFrame(menuPopupContent->GetPrimaryFrame());
+    return menuPopupFrame && menuPopupFrame->IsOpen();
+  }
+  return false;
+}
+
+LocalAccessible* XULMenuitemAccessible::ContainerWidget() const {
+  if (auto* button = dom::XULButtonElement::FromNode(GetContent())) {
+    if (auto* popup = button->GetMenuParent()) {
+      // We use GetAccessibleOrContainer instead of just GetAccessible because
+      // we strip menupopups from the tree for ATK.
+      return mDoc->GetAccessibleOrContainer(popup);
+    }
+  }
+  return nullptr;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenuSeparatorAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULMenuSeparatorAccessible::XULMenuSeparatorAccessible(nsIContent* aContent,
+                                                       DocAccessible* aDoc)
+    : XULMenuitemAccessible(aContent, aDoc) {}
+
+uint64_t XULMenuSeparatorAccessible::NativeState() const {
+  // Isn't focusable, but can be offscreen/invisible -- only copy those states
+  return XULMenuitemAccessible::NativeState() &
+         (states::OFFSCREEN | states::INVISIBLE);
+}
+
+ENameValueFlag XULMenuSeparatorAccessible::NativeName(nsString& aName) const {
+  return eNameOK;
+}
+
+role XULMenuSeparatorAccessible::NativeRole() const { return roles::SEPARATOR; }
+
+bool XULMenuSeparatorAccessible::HasPrimaryAction() const { return false; }
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenupopupAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULMenupopupAccessible::XULMenupopupAccessible(nsIContent* aContent,
+                                               DocAccessible* aDoc)
+    : XULSelectControlAccessible(aContent, aDoc) {
+  if (nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(GetFrame())) {
+    if (menuPopupFrame->GetPopupType() == widget::PopupType::Menu) {
+      mType = eMenuPopupType;
+    }
+  }
+
+  // May be the anonymous <menupopup> inside <menulist> (a combobox)
+  auto* parent = mContent->GetParentElement();
+  nsCOMPtr<nsIDOMXULSelectControlElement> selectControl =
+      parent ? parent->AsXULSelectControl() : nullptr;
+  if (selectControl) {
+    mSelectControl = parent;
+  } else {
+    mSelectControl = nullptr;
+    mGenericTypes &= ~eSelect;
+  }
+}
+
+uint64_t XULMenupopupAccessible::NativeState() const {
+  uint64_t state = LocalAccessible::NativeState();
+
+#ifdef DEBUG
+  // We are onscreen if our parent is active
+  bool isActive = mContent->AsElement()->HasAttr(nsGkAtoms::menuactive);
+  if (!isActive) {
+    LocalAccessible* parent = LocalParent();
+    if (parent) {
+      nsIContent* parentContent = parent->GetContent();
+      if (parentContent && parentContent->IsElement())
+        isActive = parentContent->AsElement()->HasAttr(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) const {
+  nsIContent* content = mContent;
+  while (content && aName.IsEmpty()) {
+    if (content->IsElement()) {
+      content->AsElement()->GetAttr(nsGkAtoms::label, aName);
+    }
+    content = content->GetFlattenedTreeParent();
+  }
+
+  return eNameOK;
+}
+
+role XULMenupopupAccessible::NativeRole() const {
+  nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(GetFrame());
+  if (menuPopupFrame && menuPopupFrame->IsContextMenu()) {
+    return roles::MENUPOPUP;
+  }
+
+  if (mParent) {
+    if (mParent->IsCombobox()) {
+      return roles::COMBOBOX_LIST;
+    }
+  }
+
+  // If accessible is not bound to the tree (this happens while children are
+  // cached) return general role.
+  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();
+}
+
+LocalAccessible* XULMenupopupAccessible::ContainerWidget() const {
+  DocAccessible* document = Document();
+
+  nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(GetFrame());
+  MOZ_ASSERT(menuPopupFrame);
+  if (!menuPopupFrame) {
+    return nullptr;
+  }
+
+  auto* cur = dom::XULPopupElement::FromNode(GetContent());
+  while (cur) {
+    auto* menu = cur->GetContainingMenu();
+    if (!menu) {
+      // <panel> / <tooltip> / etc.
+      return nullptr;
+    }
+    dom::XULMenuParentElement* parent = menu->GetMenuParent();
+    if (!parent) {
+      LocalAccessible* menuPopup = document->GetAccessible(cur);
+      MOZ_ASSERT(menuPopup);
+      return menuPopup ? menuPopup->LocalParent() : nullptr;
+    }
+
+    if (parent->IsMenuBar()) {
+      return document->GetAccessible(parent);
+    }
+
+    cur = dom::XULPopupElement::FromNode(parent);
+    MOZ_ASSERT(cur, "Should be a popup");
+  }
+
+  MOZ_ASSERT_UNREACHABLE("How did we get out of the loop without returning?");
+  return nullptr;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenubarAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULMenubarAccessible::XULMenubarAccessible(nsIContent* aContent,
+                                           DocAccessible* aDoc)
+    : AccessibleWrap(aContent, aDoc) {}
+
+ENameValueFlag XULMenubarAccessible::NativeName(nsString& aName) const {
+  aName.AssignLiteral("Application");
+  return eNameOK;
+}
+
+role XULMenubarAccessible::NativeRole() const { return roles::MENUBAR; }
+
+////////////////////////////////////////////////////////////////////////////////
+// XULMenubarAccessible: Widgets
+
+bool XULMenubarAccessible::IsActiveWidget() const {
+  auto* menuBar = dom::XULMenuBarElement::FromNode(GetContent());
+  return menuBar && menuBar->IsActive();
+}
+
+bool XULMenubarAccessible::AreItemsOperable() const { return true; }
+
+LocalAccessible* XULMenubarAccessible::CurrentItem() const {
+  auto* content = dom::XULMenuParentElement::FromNode(GetContent());
+  MOZ_ASSERT(content);
+  if (!content || !content->GetActiveMenuChild()) {
+    return nullptr;
+  }
+  return mDoc->GetAccessible(content->GetActiveMenuChild());
+}
+
+void XULMenubarAccessible::SetCurrentItem(const LocalAccessible* aItem) {
+  NS_ERROR("XULMenubarAccessible::SetCurrentItem not implemented");
+}
diff --git a/accessible/xul/XULMenuAccessible.h b/accessible/xul/XULMenuAccessible.h
new file mode 100644
index 0000000000..43d165d798
--- /dev/null
+++ b/accessible/xul/XULMenuAccessible.h
@@ -0,0 +1,113 @@
+/* -*- 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 "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);
+
+  // LocalAccessible
+  virtual void Description(nsString& aDescription) const override;
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual uint64_t NativeInteractiveState() const override;
+
+  // ActionAccessible
+  virtual bool HasPrimaryAction() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual KeyBinding AccessKey() const override;
+  virtual KeyBinding KeyboardShortcut() const override;
+
+  // Widgets
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+  virtual LocalAccessible* ContainerWidget() const override;
+
+ protected:
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+  virtual int32_t GetLevel(bool aFast) const override;
+};
+
+/**
+ * Used for XUL menuseparator element.
+ */
+class XULMenuSeparatorAccessible : public XULMenuitemAccessible {
+ public:
+  XULMenuSeparatorAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+
+  // ActionAccessible
+  virtual bool HasPrimaryAction() const override;
+
+ protected:
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+};
+
+/**
+ * Used for XUL menupopup and panel.
+ */
+class XULMenupopupAccessible : public XULSelectControlAccessible {
+ public:
+  XULMenupopupAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+
+  virtual LocalAccessible* ContainerWidget() const override;
+
+ protected:
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+};
+
+/**
+ * Used for XUL menubar element.
+ */
+class XULMenubarAccessible : public AccessibleWrap {
+ public:
+  XULMenubarAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+
+  // Widget
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+  virtual LocalAccessible* CurrentItem() const override;
+  virtual void SetCurrentItem(const LocalAccessible* aItem) override;
+
+ protected:
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULSelectControlAccessible.cpp b/accessible/xul/XULSelectControlAccessible.cpp
new file mode 100644
index 0000000000..006d1daf89
--- /dev/null
+++ b/accessible/xul/XULSelectControlAccessible.cpp
@@ -0,0 +1,253 @@
+/* -*- 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 "nsIDOMXULSelectCntrlItemEl.h"
+#include "nsIDOMXULMultSelectCntrlEl.h"
+
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/KeyboardEventBinding.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULSelectControlAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULSelectControlAccessible::XULSelectControlAccessible(nsIContent* aContent,
+                                                       DocAccessible* aDoc)
+    : AccessibleWrap(aContent, aDoc) {
+  mGenericTypes |= eSelect;
+  mSelectControl = aContent->AsElement();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULSelectControlAccessible: LocalAccessible
+
+void XULSelectControlAccessible::Shutdown() {
+  mSelectControl = nullptr;
+  AccessibleWrap::Shutdown();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULSelectControlAccessible: SelectAccessible
+
+void XULSelectControlAccessible::SelectedItems(nsTArray<Accessible*>* aItems) {
+  // For XUL multi-select control
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> xulMultiSelect =
+      mSelectControl->AsXULMultiSelectControl();
+  if (xulMultiSelect) {
+    int32_t length = 0;
+    xulMultiSelect->GetSelectedCount(&length);
+    for (int32_t index = 0; index < length; index++) {
+      RefPtr<dom::Element> element;
+      xulMultiSelect->MultiGetSelectedItem(index, getter_AddRefs(element));
+      LocalAccessible* item = mDoc->GetAccessible(element);
+      if (item) aItems->AppendElement(item);
+    }
+  } else {  // Single select?
+    nsCOMPtr<nsIDOMXULSelectControlElement> selectControl =
+        mSelectControl->AsXULSelectControl();
+    RefPtr<dom::Element> element;
+    selectControl->GetSelectedItem(getter_AddRefs(element));
+    if (element) {
+      LocalAccessible* item = mDoc->GetAccessible(element);
+      if (item) aItems->AppendElement(item);
+    }
+  }
+}
+
+Accessible* XULSelectControlAccessible::GetSelectedItem(uint32_t aIndex) {
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+      mSelectControl->AsXULMultiSelectControl();
+
+  RefPtr<dom::Element> element;
+  if (multiSelectControl) {
+    multiSelectControl->MultiGetSelectedItem(aIndex, getter_AddRefs(element));
+  } else if (aIndex == 0) {
+    nsCOMPtr<nsIDOMXULSelectControlElement> selectControl =
+        mSelectControl->AsXULSelectControl();
+    if (selectControl) {
+      selectControl->GetSelectedItem(getter_AddRefs(element));
+    }
+  }
+
+  return element && mDoc ? mDoc->GetAccessible(element) : nullptr;
+}
+
+uint32_t XULSelectControlAccessible::SelectedItemCount() {
+  // For XUL multi-select control
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+      mSelectControl->AsXULMultiSelectControl();
+  if (multiSelectControl) {
+    int32_t count = 0;
+    multiSelectControl->GetSelectedCount(&count);
+    return count;
+  }
+
+  // For XUL single-select control/menulist
+  nsCOMPtr<nsIDOMXULSelectControlElement> selectControl =
+      mSelectControl->AsXULSelectControl();
+  if (selectControl) {
+    int32_t index = -1;
+    selectControl->GetSelectedIndex(&index);
+    return (index >= 0) ? 1 : 0;
+  }
+
+  return 0;
+}
+
+bool XULSelectControlAccessible::AddItemToSelection(uint32_t aIndex) {
+  LocalAccessible* item = LocalChildAt(aIndex);
+  if (!item || !item->GetContent()) return false;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> itemElm =
+      item->GetContent()->AsElement()->AsXULSelectControlItem();
+  if (!itemElm) return false;
+
+  bool isItemSelected = false;
+  itemElm->GetSelected(&isItemSelected);
+  if (isItemSelected) return true;
+
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+      mSelectControl->AsXULMultiSelectControl();
+
+  if (multiSelectControl) {
+    multiSelectControl->AddItemToSelection(itemElm);
+  } else {
+    nsCOMPtr<nsIDOMXULSelectControlElement> selectControl =
+        mSelectControl->AsXULSelectControl();
+    if (selectControl) {
+      selectControl->SetSelectedItem(item->Elm());
+    }
+  }
+
+  return true;
+}
+
+bool XULSelectControlAccessible::RemoveItemFromSelection(uint32_t aIndex) {
+  LocalAccessible* item = LocalChildAt(aIndex);
+  if (!item || !item->GetContent()) return false;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> itemElm =
+      item->GetContent()->AsElement()->AsXULSelectControlItem();
+  if (!itemElm) return false;
+
+  bool isItemSelected = false;
+  itemElm->GetSelected(&isItemSelected);
+  if (!isItemSelected) return true;
+
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+      mSelectControl->AsXULMultiSelectControl();
+
+  if (multiSelectControl) {
+    multiSelectControl->RemoveItemFromSelection(itemElm);
+  } else {
+    nsCOMPtr<nsIDOMXULSelectControlElement> selectControl =
+        mSelectControl->AsXULSelectControl();
+    if (selectControl) {
+      selectControl->SetSelectedItem(nullptr);
+    }
+  }
+
+  return true;
+}
+
+bool XULSelectControlAccessible::IsItemSelected(uint32_t aIndex) {
+  LocalAccessible* item = LocalChildAt(aIndex);
+  if (!item || !item->GetContent()) return false;
+
+  nsCOMPtr<nsIDOMXULSelectControlItemElement> itemElm =
+      item->GetContent()->AsElement()->AsXULSelectControlItem();
+  if (!itemElm) return false;
+
+  bool isItemSelected = false;
+  itemElm->GetSelected(&isItemSelected);
+  return isItemSelected;
+}
+
+bool XULSelectControlAccessible::UnselectAll() {
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+      mSelectControl->AsXULMultiSelectControl();
+  if (multiSelectControl) {
+    multiSelectControl->ClearSelection();
+  } else {
+    nsCOMPtr<nsIDOMXULSelectControlElement> selectControl =
+        mSelectControl->AsXULSelectControl();
+    if (selectControl) {
+      selectControl->SetSelectedIndex(-1);
+    }
+  }
+
+  return true;
+}
+
+bool XULSelectControlAccessible::SelectAll() {
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+      mSelectControl->AsXULMultiSelectControl();
+  if (multiSelectControl) {
+    multiSelectControl->SelectAll();
+    return true;
+  }
+
+  // otherwise, don't support this method
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULSelectControlAccessible: Widgets
+
+LocalAccessible* XULSelectControlAccessible::CurrentItem() const {
+  // aria-activedescendant should override.
+  LocalAccessible* current = AccessibleWrap::CurrentItem();
+  if (current) {
+    return current;
+  }
+
+  if (!mSelectControl) return nullptr;
+
+  RefPtr<dom::Element> currentItemElm;
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+      mSelectControl->AsXULMultiSelectControl();
+  if (multiSelectControl) {
+    multiSelectControl->GetCurrentItem(getter_AddRefs(currentItemElm));
+  } else {
+    nsCOMPtr<nsIDOMXULSelectControlElement> selectControl =
+        mSelectControl->AsXULSelectControl();
+    if (selectControl) {
+      selectControl->GetSelectedItem(getter_AddRefs(currentItemElm));
+    }
+  }
+
+  if (currentItemElm) {
+    DocAccessible* document = Document();
+    if (document) return document->GetAccessible(currentItemElm);
+  }
+
+  return nullptr;
+}
+
+void XULSelectControlAccessible::SetCurrentItem(const LocalAccessible* aItem) {
+  if (!mSelectControl) return;
+
+  nsCOMPtr<dom::Element> itemElm = aItem->Elm();
+  nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelectControl =
+      itemElm->AsXULMultiSelectControl();
+  if (multiSelectControl) {
+    multiSelectControl->SetCurrentItem(itemElm);
+  } else {
+    nsCOMPtr<nsIDOMXULSelectControlElement> selectControl =
+        mSelectControl->AsXULSelectControl();
+    if (selectControl) {
+      selectControl->SetSelectedItem(itemElm);
+    }
+  }
+}
diff --git a/accessible/xul/XULSelectControlAccessible.h b/accessible/xul/XULSelectControlAccessible.h
new file mode 100644
index 0000000000..ae201c74b0
--- /dev/null
+++ b/accessible/xul/XULSelectControlAccessible.h
@@ -0,0 +1,47 @@
+/* -*- 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"
+
+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() {}
+
+  // LocalAccessible
+  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 LocalAccessible* CurrentItem() const override;
+  virtual void SetCurrentItem(const LocalAccessible* aItem) override;
+
+ protected:
+  RefPtr<dom::Element> mSelectControl;
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULTabAccessible.cpp b/accessible/xul/XULTabAccessible.cpp
new file mode 100644
index 0000000000..1e2281487a
--- /dev/null
+++ b/accessible/xul/XULTabAccessible.cpp
@@ -0,0 +1,217 @@
+/* -*- 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 "ARIAMap.h"
+#include "nsAccUtils.h"
+#include "Relation.h"
+#include "mozilla/a11y/Role.h"
+#include "States.h"
+
+// NOTE: alphabetically ordered
+#include "mozilla/dom/Document.h"
+#include "nsIDOMXULSelectCntrlItemEl.h"
+#include "nsIDOMXULRelatedElement.h"
+#include "nsXULElement.h"
+
+#include "mozilla/dom/BindingDeclarations.h"
+
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTabAccessible::XULTabAccessible(nsIContent* aContent, DocAccessible* aDoc)
+    : HyperTextAccessible(aContent, aDoc) {}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabAccessible: LocalAccessible
+
+bool XULTabAccessible::HasPrimaryAction() const { return true; }
+
+void XULTabAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
+  if (aIndex == eAction_Switch) aName.AssignLiteral("switch");
+}
+
+bool XULTabAccessible::DoAction(uint8_t index) const {
+  if (index == eAction_Switch) {
+    // XXXbz Could this just FromContent?
+    RefPtr<nsXULElement> tab = nsXULElement::FromNodeOrNull(mContent);
+    if (tab) {
+      tab->Click(mozilla::dom::CallerType::System);
+      return true;
+    }
+  }
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabAccessible: LocalAccessible
+
+role XULTabAccessible::NativeRole() const { return roles::PAGETAB; }
+
+uint64_t XULTabAccessible::NativeState() const {
+  // 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 =
+      Elm()->AsXULSelectControlItem();
+  if (tab) {
+    bool selected = false;
+    if (NS_SUCCEEDED(tab->GetSelected(&selected)) && selected) {
+      state |= states::SELECTED;
+    }
+
+    if (mContent->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::pinned)) {
+      state |= states::PINNED;
+    }
+  }
+
+  return state;
+}
+
+uint64_t XULTabAccessible::NativeInteractiveState() const {
+  uint64_t state = LocalAccessible::NativeInteractiveState();
+  return (state & states::UNAVAILABLE) ? state : state | states::SELECTABLE;
+}
+
+Relation XULTabAccessible::RelationByType(RelationType aType) const {
+  Relation rel = AccessibleWrap::RelationByType(aType);
+  if (aType != RelationType::LABEL_FOR) return rel;
+
+  // Expose 'LABEL_FOR' relation on tab accessible for tabpanel accessible.
+  ErrorResult rv;
+  nsIContent* parent = mContent->AsElement()->Closest("tabs"_ns, rv);
+  if (!parent) return rel;
+
+  nsCOMPtr<nsIDOMXULRelatedElement> tabsElm =
+      parent->AsElement()->AsXULRelated();
+  if (!tabsElm) return rel;
+
+  RefPtr<mozilla::dom::Element> tabpanelElement;
+  tabsElm->GetRelatedElement(GetNode(), getter_AddRefs(tabpanelElement));
+  if (!tabpanelElement) return rel;
+
+  rel.AppendTarget(mDoc, tabpanelElement);
+  return rel;
+}
+
+void XULTabAccessible::ApplyARIAState(uint64_t* aState) const {
+  HyperTextAccessible::ApplyARIAState(aState);
+  // XUL tab has an implicit ARIA role of tab, so support aria-selected.
+  // Don't use aria::MapToState because that will set the SELECTABLE state
+  // even if the tab is disabled.
+  if (nsAccUtils::IsARIASelected(this)) {
+    *aState |= states::SELECTED;
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabsAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTabsAccessible::XULTabsAccessible(nsIContent* aContent, DocAccessible* aDoc)
+    : XULSelectControlAccessible(aContent, aDoc) {}
+
+role XULTabsAccessible::NativeRole() const { return roles::PAGETABLIST; }
+
+bool XULTabsAccessible::HasPrimaryAction() const { return false; }
+
+void XULTabsAccessible::Value(nsString& aValue) const { aValue.Truncate(); }
+
+ENameValueFlag XULTabsAccessible::NativeName(nsString& aName) const {
+  // no name
+  return eNameOK;
+}
+
+void XULTabsAccessible::ApplyARIAState(uint64_t* aState) const {
+  XULSelectControlAccessible::ApplyARIAState(aState);
+  // XUL tabs has an implicit ARIA role of tablist, so support
+  // aria-multiselectable.
+  MOZ_ASSERT(Elm());
+  aria::MapToState(aria::eARIAMultiSelectable, Elm(), aState);
+}
+
+// XUL tabs is a single selection control and doesn't allow ARIA selection.
+// However, if aria-multiselectable is used, it becomes a multiselectable
+// control, where both native and ARIA markup are used to set selection.
+// Therefore, if aria-multiselectable is set, use the base implementation of
+// the selection retrieval methods in order to support ARIA selection.
+// We don't bother overriding the selection setting methods because
+// current front-end code using XUL tabs doesn't support setting of
+//  aria-selected by the a11y engine and we still want to be able to set the
+// primary selected item according to XUL.
+
+void XULTabsAccessible::SelectedItems(nsTArray<Accessible*>* aItems) {
+  if (nsAccUtils::IsARIAMultiSelectable(this)) {
+    AccessibleWrap::SelectedItems(aItems);
+  } else {
+    XULSelectControlAccessible::SelectedItems(aItems);
+  }
+}
+
+Accessible* XULTabsAccessible::GetSelectedItem(uint32_t aIndex) {
+  if (nsAccUtils::IsARIAMultiSelectable(this)) {
+    return AccessibleWrap::GetSelectedItem(aIndex);
+  }
+
+  return XULSelectControlAccessible::GetSelectedItem(aIndex);
+}
+
+uint32_t XULTabsAccessible::SelectedItemCount() {
+  if (nsAccUtils::IsARIAMultiSelectable(this)) {
+    return AccessibleWrap::SelectedItemCount();
+  }
+
+  return XULSelectControlAccessible::SelectedItemCount();
+}
+
+bool XULTabsAccessible::IsItemSelected(uint32_t aIndex) {
+  if (nsAccUtils::IsARIAMultiSelectable(this)) {
+    return AccessibleWrap::IsItemSelected(aIndex);
+  }
+
+  return XULSelectControlAccessible::IsItemSelected(aIndex);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabpanelsAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+role XULTabpanelsAccessible::NativeRole() const { return roles::PANE; }
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTabpanelAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTabpanelAccessible::XULTabpanelAccessible(nsIContent* aContent,
+                                             DocAccessible* aDoc)
+    : AccessibleWrap(aContent, aDoc) {}
+
+role XULTabpanelAccessible::NativeRole() const { return roles::PROPERTYPAGE; }
+
+Relation XULTabpanelAccessible::RelationByType(RelationType aType) const {
+  Relation rel = AccessibleWrap::RelationByType(aType);
+  if (aType != RelationType::LABELLED_BY) return rel;
+
+  // Expose 'LABELLED_BY' relation on tabpanel accessible for tab accessible.
+  if (!mContent->GetParent()) return rel;
+
+  nsCOMPtr<nsIDOMXULRelatedElement> tabpanelsElm =
+      mContent->GetParent()->AsElement()->AsXULRelated();
+  if (!tabpanelsElm) return rel;
+
+  RefPtr<mozilla::dom::Element> tabElement;
+  tabpanelsElm->GetRelatedElement(GetNode(), getter_AddRefs(tabElement));
+  if (!tabElement) return rel;
+
+  rel.AppendTarget(mDoc, tabElement);
+  return rel;
+}
diff --git a/accessible/xul/XULTabAccessible.h b/accessible/xul/XULTabAccessible.h
new file mode 100644
index 0000000000..66ffc2613f
--- /dev/null
+++ b/accessible/xul/XULTabAccessible.h
@@ -0,0 +1,98 @@
+/* -*- 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 "HyperTextAccessible.h"
+#include "XULMenuAccessible.h"
+#include "XULSelectControlAccessible.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * An individual tab, xul:tab element.
+ */
+class XULTabAccessible : public HyperTextAccessible {
+ public:
+  enum { eAction_Switch = 0 };
+
+  XULTabAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual uint64_t NativeInteractiveState() const override;
+  virtual Relation RelationByType(RelationType aType) const override;
+  virtual void ApplyARIAState(uint64_t* aState) const override;
+
+  // ActionAccessible
+  virtual bool HasPrimaryAction() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) const override;
+};
+
+/**
+ * A container of tab objects, xul:tabs element.
+ */
+class XULTabsAccessible : public XULSelectControlAccessible {
+ public:
+  XULTabsAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual void Value(nsString& aValue) const override;
+  virtual a11y::role NativeRole() const override;
+  virtual void ApplyARIAState(uint64_t* aState) const override;
+
+  // ActionAccessible
+  virtual bool HasPrimaryAction() const 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;
+
+ protected:
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+};
+
+/**
+ * A container of tab panels, xul:tabpanels element.
+ */
+class XULTabpanelsAccessible : public AccessibleWrap {
+ public:
+  XULTabpanelsAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : AccessibleWrap(aContent, aDoc) {
+    mType = eXULTabpanelsType;
+  }
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const 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);
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+  virtual Relation RelationByType(RelationType aType) const override;
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif
diff --git a/accessible/xul/XULTreeAccessible.cpp b/accessible/xul/XULTreeAccessible.cpp
new file mode 100644
index 0000000000..818e1f8e3e
--- /dev/null
+++ b/accessible/xul/XULTreeAccessible.cpp
@@ -0,0 +1,995 @@
+/* -*- 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 "LocalAccessible-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 "mozilla/a11y/Role.h"
+#include "States.h"
+#include "XULTreeGridAccessible.h"
+#include "nsQueryObject.h"
+
+#include "nsComponentManagerUtils.h"
+#include "nsIAutoCompletePopup.h"
+#include "nsIDOMXULMenuListElement.h"
+#include "nsITreeSelection.h"
+#include "nsTreeBodyFrame.h"
+#include "nsTreeColumns.h"
+#include "nsTreeUtils.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/dom/XULTreeElementBinding.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::GetTree(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, LocalAccessible, mTree,
+                                   mAccessibleCache)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(XULTreeAccessible)
+NS_INTERFACE_MAP_END_INHERITING(LocalAccessible)
+
+NS_IMPL_ADDREF_INHERITED(XULTreeAccessible, LocalAccessible)
+NS_IMPL_RELEASE_INHERITED(XULTreeAccessible, LocalAccessible)
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: LocalAccessible implementation
+
+uint64_t XULTreeAccessible::NativeState() const {
+  // Get focus status from base class.
+  uint64_t state = LocalAccessible::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) const {
+  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) {
+    RefPtr<nsTreeColumn> keyCol;
+
+    RefPtr<nsTreeColumns> cols = mTree->GetColumns();
+    if (cols) keyCol = cols->GetKeyColumn();
+
+    mTreeView->GetCellText(currentIndex, keyCol, aValue);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: LocalAccessible implementation
+
+void XULTreeAccessible::Shutdown() {
+  if (mDoc && !mDoc->IsDefunct()) {
+    UnbindCacheEntriesFromDocument(mAccessibleCache);
+  }
+
+  mTree = nullptr;
+  mTreeView = nullptr;
+
+  AccessibleWrap::Shutdown();
+}
+
+role XULTreeAccessible::NativeRole() const {
+  // 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();
+  nsTreeColumn* primaryCol = cols->GetPrimaryColumn();
+
+  return primaryCol ? roles::OUTLINE : roles::LIST;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: LocalAccessible implementation (DON'T put methods here)
+
+LocalAccessible* XULTreeAccessible::LocalChildAtPoint(
+    int32_t aX, int32_t aY, EWhichChildAtPoint aWhichChild) {
+  nsIFrame* frame = GetFrame();
+  if (!frame) return nullptr;
+
+  nsPresContext* presContext = frame->PresContext();
+  PresShell* presShell = presContext->PresShell();
+
+  nsIFrame* rootFrame = presShell->GetRootFrame();
+  NS_ENSURE_TRUE(rootFrame, nullptr);
+
+  CSSIntRect rootRect = rootFrame->GetScreenRect();
+
+  int32_t clientX = presContext->DevPixelsToIntCSSPixels(aX) - rootRect.X();
+  int32_t clientY = presContext->DevPixelsToIntCSSPixels(aY) - rootRect.Y();
+
+  ErrorResult rv;
+  dom::TreeCellInfo cellInfo;
+  mTree->GetCellAt(clientX, clientY, cellInfo, rv);
+
+  // If we failed to find tree cell for the given point then it might be
+  // tree columns.
+  if (cellInfo.mRow == -1 || !cellInfo.mCol) {
+    return AccessibleWrap::LocalChildAtPoint(aX, aY, aWhichChild);
+  }
+
+  XULTreeItemAccessibleBase* child = GetTreeItemAccessible(cellInfo.mRow);
+  if (aWhichChild == EWhichChildAtPoint::DeepestChild && child) {
+    LocalAccessible* cell = child->GetCellAccessible(cellInfo.mCol);
+    if (cell) {
+      return cell;
+    }
+  }
+
+  return child;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: SelectAccessible
+
+LocalAccessible* XULTreeAccessible::CurrentItem() const {
+  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(const LocalAccessible* 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++) {
+      LocalAccessible* 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: LocalAccessible implementation
+
+LocalAccessible* XULTreeAccessible::LocalChildAt(uint32_t aIndex) const {
+  uint32_t childCount = LocalAccessible::ChildCount();
+  if (aIndex < childCount) {
+    return LocalAccessible::LocalChildAt(aIndex);
+  }
+
+  return GetTreeItemAccessible(aIndex - childCount);
+}
+
+uint32_t XULTreeAccessible::ChildCount() const {
+  // Tree's children count is row count + treecols count.
+  uint32_t childCount = LocalAccessible::ChildCount();
+  if (!mTreeView) return childCount;
+
+  int32_t rowCount = 0;
+  mTreeView->GetRowCount(&rowCount);
+  childCount += rowCount;
+
+  return childCount;
+}
+
+Relation XULTreeAccessible::RelationByType(RelationType aType) const {
+  if (aType == RelationType::NODE_PARENT_OF) {
+    if (mTreeView) {
+      return Relation(new XULTreeItemIterator(this, mTreeView, -1));
+    }
+
+    return Relation();
+  }
+
+  return LocalAccessible::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;
+}
+
+LocalAccessible* XULTreeAccessible::ContainerWidget() const { return nullptr; }
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: public implementation
+
+XULTreeItemAccessibleBase* 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));
+  return mAccessibleCache.WithEntryHandle(
+      key, [&](auto&& entry) -> XULTreeItemAccessibleBase* {
+        if (entry) {
+          return entry->get();
+        }
+
+        RefPtr<XULTreeItemAccessibleBase> treeItem =
+            CreateTreeItemAccessible(aRow);
+        if (treeItem) {
+          entry.Insert(RefPtr{treeItem});
+          Document()->BindToDocument(treeItem, nullptr);
+          return treeItem.get();
+        }
+
+        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));
+    XULTreeItemAccessibleBase* 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));
+    XULTreeItemAccessibleBase* 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;
+  }
+
+  RefPtr<nsTreeColumns> treeColumns = mTree->GetColumns();
+  if (!treeColumns) return;
+
+  int32_t endCol = aEndCol;
+
+  if (endCol == -1) {
+    // We need to make sure to cast to int32_t before we do the subtraction, in
+    // case the column count is 0.
+    endCol = static_cast<int32_t>(treeColumns->Count()) - 1;
+  }
+
+  for (int32_t rowIdx = aStartRow; rowIdx <= endRow; ++rowIdx) {
+    void* key = reinterpret_cast<void*>(intptr_t(rowIdx));
+    XULTreeItemAccessibleBase* treeitemAcc = mAccessibleCache.GetWeak(key);
+
+    if (treeitemAcc) {
+      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;
+  LocalAccessible* item = CurrentItem();
+  if (item) {
+    FocusMgr()->ActiveItemChanged(item, true);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeAccessible: protected implementation
+
+already_AddRefed<XULTreeItemAccessibleBase>
+XULTreeAccessible::CreateTreeItemAccessible(int32_t aRow) const {
+  RefPtr<XULTreeItemAccessibleBase> accessible = new XULTreeItemAccessible(
+      mContent, mDoc, const_cast<XULTreeAccessible*>(this), mTree, mTreeView,
+      aRow);
+
+  return accessible.forget();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase
+////////////////////////////////////////////////////////////////////////////////
+
+XULTreeItemAccessibleBase::XULTreeItemAccessibleBase(
+    nsIContent* aContent, DocAccessible* aDoc, LocalAccessible* aParent,
+    dom::XULTreeElement* 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, LocalAccessible,
+                                   mTree)
+
+NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(XULTreeItemAccessibleBase,
+                                               LocalAccessible)
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase: LocalAccessible
+
+Accessible* XULTreeItemAccessibleBase::FocusedChild() {
+  return FocusMgr()->FocusedLocalAccessible() == this ? this : nullptr;
+}
+
+nsIntRect XULTreeItemAccessibleBase::BoundsInCSSPixels() const {
+  // Get x coordinate and width from treechildren element, get y coordinate and
+  // height from tree cell.
+
+  RefPtr<nsTreeColumn> column = nsCoreUtils::GetFirstSensibleColumn(mTree);
+
+  nsresult rv;
+  nsIntRect rect = mTree->GetCoordsForCellItem(mRow, column, u"cell"_ns, rv);
+  if (NS_FAILED(rv)) {
+    return nsIntRect();
+  }
+
+  RefPtr<dom::Element> bodyElement = mTree->GetTreeBody();
+  if (!bodyElement || !bodyElement->IsXULElement()) {
+    return nsIntRect();
+  }
+
+  rect.width = bodyElement->ClientWidth();
+
+  nsIFrame* bodyFrame = bodyElement->GetPrimaryFrame();
+  if (!bodyFrame) {
+    return nsIntRect();
+  }
+
+  CSSIntRect screenRect = bodyFrame->GetScreenRect();
+  rect.x = screenRect.x;
+  rect.y += screenRect.y;
+  return rect;
+}
+
+nsRect XULTreeItemAccessibleBase::BoundsInAppUnits() const {
+  nsIntRect bounds = BoundsInCSSPixels();
+  nsPresContext* presContext = mDoc->PresContext();
+  return nsRect(presContext->CSSPixelsToAppUnits(bounds.X()),
+                presContext->CSSPixelsToAppUnits(bounds.Y()),
+                presContext->CSSPixelsToAppUnits(bounds.Width()),
+                presContext->CSSPixelsToAppUnits(bounds.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() const {
+  nsCOMPtr<nsITreeSelection> selection;
+  mTreeView->GetSelection(getter_AddRefs(selection));
+  if (selection) selection->SetCurrentIndex(mRow);
+
+  // focus event will be fired here
+  LocalAccessible::TakeFocus();
+}
+
+Relation XULTreeItemAccessibleBase::RelationByType(RelationType aType) const {
+  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();
+  }
+}
+
+bool XULTreeItemAccessibleBase::HasPrimaryAction() const { return true; }
+
+uint8_t XULTreeItemAccessibleBase::ActionCount() const {
+  // "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) const {
+  if (aIndex != eAction_Click &&
+      (aIndex != eAction_Expand || !IsExpandable())) {
+    return false;
+  }
+
+  DoCommand(nullptr, aIndex);
+  return true;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase: LocalAccessible implementation
+
+void XULTreeItemAccessibleBase::Shutdown() {
+  mTree = nullptr;
+  mTreeView = nullptr;
+  mRow = -1;
+  mParent = nullptr;  // null-out to prevent base class's shutdown ops
+
+  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() const {
+  // 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 = mTree->GetFirstVisibleRow();
+  int32_t lastVisibleRow = mTree->GetLastVisibleRow();
+  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
+
+LocalAccessible* XULTreeItemAccessibleBase::ContainerWidget() const {
+  return mParent;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase: LocalAccessible protected methods
+
+void XULTreeItemAccessibleBase::DispatchClickEvent(
+    nsIContent* aContent, uint32_t aActionIndex) const {
+  if (IsDefunct()) return;
+
+  RefPtr<nsTreeColumns> columns = mTree->GetColumns();
+  if (!columns) return;
+
+  // Get column and pseudo element.
+  RefPtr<nsTreeColumn> column;
+  nsAutoString pseudoElm;
+
+  if (aActionIndex == eAction_Click) {
+    // Key column is visible and clickable.
+    column = columns->GetKeyColumn();
+  } else {
+    // Primary column contains a twisty we should click on.
+    column = columns->GetPrimaryColumn();
+    pseudoElm = u"twisty"_ns;
+  }
+
+  if (column) {
+    RefPtr<dom::XULTreeElement> tree = mTree;
+    nsCoreUtils::DispatchClickEvent(tree, mRow, column, pseudoElm);
+  }
+}
+
+LocalAccessible* XULTreeItemAccessibleBase::GetSiblingAtOffset(
+    int32_t aOffset, nsresult* aError) const {
+  if (aError) *aError = NS_OK;  // fail peacefully
+
+  return mParent->LocalChildAt(IndexInParent() + aOffset);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessibleBase: protected implementation
+
+bool XULTreeItemAccessibleBase::IsExpandable() const {
+  bool isContainer = false;
+  mTreeView->IsContainer(mRow, &isContainer);
+  if (isContainer) {
+    bool isEmpty = false;
+    mTreeView->IsContainerEmpty(mRow, &isEmpty);
+    if (!isEmpty) {
+      RefPtr<nsTreeColumns> columns = mTree->GetColumns();
+      if (columns) {
+        nsTreeColumn* primaryColumn = columns->GetPrimaryColumn();
+        if (primaryColumn && !nsCoreUtils::IsColumnHidden(primaryColumn)) {
+          return true;
+        }
+      }
+    }
+  }
+
+  return false;
+}
+
+void XULTreeItemAccessibleBase::GetCellName(nsTreeColumn* aColumn,
+                                            nsAString& aName) const {
+  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, LocalAccessible* aParent,
+    dom::XULTreeElement* aTree, nsITreeView* aTreeView, int32_t aRow)
+    : XULTreeItemAccessibleBase(aContent, aDoc, aParent, aTree, aTreeView,
+                                aRow) {
+  mStateFlags |= eNoKidsFromDOM;
+  mColumn = nsCoreUtils::GetFirstSensibleColumn(mTree, FlushType::None);
+  GetCellName(mColumn, mCachedName);
+}
+
+XULTreeItemAccessible::~XULTreeItemAccessible() {}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessible: nsISupports implementation
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(XULTreeItemAccessible,
+                                   XULTreeItemAccessibleBase, mColumn)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(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) const {
+  aName.Truncate();
+
+  GetCellName(mColumn, aName);
+  return eNameOK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeItemAccessible: LocalAccessible implementation
+
+void XULTreeItemAccessible::Shutdown() {
+  mColumn = nullptr;
+  XULTreeItemAccessibleBase::Shutdown();
+}
+
+role XULTreeItemAccessible::NativeRole() const {
+  RefPtr<nsTreeColumns> columns = mTree->GetColumns();
+  if (!columns) {
+    NS_ERROR("No tree columns object in the tree!");
+    return roles::NOTHING;
+  }
+
+  nsTreeColumn* primaryColumn = columns->GetPrimaryColumn();
+
+  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) {}
+
+LocalAccessible* XULTreeColumAccessible::GetSiblingAtOffset(
+    int32_t aOffset, nsresult* aError) const {
+  if (aOffset < 0) {
+    return XULColumAccessible::GetSiblingAtOffset(aOffset, aError);
+  }
+
+  if (aError) *aError = NS_OK;  // fail peacefully
+
+  RefPtr<dom::XULTreeElement> tree = nsCoreUtils::GetTree(mContent);
+  if (tree) {
+    nsCOMPtr<nsITreeView> treeView = tree->GetView(FlushType::None);
+    if (treeView) {
+      int32_t rowCount = 0;
+      treeView->GetRowCount(&rowCount);
+      if (rowCount > 0 && aOffset <= rowCount) {
+        XULTreeAccessible* treeAcc = LocalParent()->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 0000000000..7abc53df42
--- /dev/null
+++ b/accessible/xul/XULTreeAccessible.h
@@ -0,0 +1,265 @@
+/* -*- 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 "nsITreeView.h"
+#include "XULListboxAccessible.h"
+#include "mozilla/dom/XULTreeElement.h"
+
+class nsTreeBodyFrame;
+class nsTreeColumn;
+
+namespace mozilla {
+namespace a11y {
+
+class XULTreeGridCellAccessible;
+class XULTreeItemAccessibleBase;
+
+/*
+ * A class the represents the XUL Tree widget.
+ */
+const uint32_t kMaxTreeColumns = 100;
+const uint32_t kDefaultTreeCacheLength = 128;
+
+/**
+ * LocalAccessible 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, LocalAccessible)
+
+  // LocalAccessible
+  virtual void Shutdown() override;
+  virtual void Value(nsString& aValue) const override;
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual LocalAccessible* LocalChildAtPoint(
+      int32_t aX, int32_t aY, EWhichChildAtPoint aWhichChild) override;
+
+  virtual LocalAccessible* LocalChildAt(uint32_t aIndex) const override;
+  virtual uint32_t ChildCount() const override;
+  virtual Relation RelationByType(RelationType aType) const 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 LocalAccessible* CurrentItem() const override;
+  virtual void SetCurrentItem(const LocalAccessible* aItem) override;
+
+  virtual LocalAccessible* 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
+   */
+  XULTreeItemAccessibleBase* 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<XULTreeItemAccessibleBase> CreateTreeItemAccessible(
+      int32_t aRow) const;
+
+  RefPtr<dom::XULTreeElement> mTree;
+  nsITreeView* mTreeView;
+  mutable nsRefPtrHashtable<nsPtrHashKey<const void>, XULTreeItemAccessibleBase>
+      mAccessibleCache;
+};
+
+/**
+ * Base class for tree item accessibles.
+ */
+
+class XULTreeItemAccessibleBase : public AccessibleWrap {
+ public:
+  XULTreeItemAccessibleBase(nsIContent* aContent, DocAccessible* aDoc,
+                            LocalAccessible* aParent,
+                            dom::XULTreeElement* aTree, nsITreeView* aTreeView,
+                            int32_t aRow);
+
+  // nsISupports and cycle collection
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeItemAccessibleBase,
+                                           AccessibleWrap)
+
+  // LocalAccessible
+  virtual void Shutdown() override;
+  virtual nsRect BoundsInAppUnits() const override;
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  virtual nsIntRect BoundsInCSSPixels() const override;
+  virtual GroupPos GroupPosition() override;
+  virtual uint64_t NativeState() const override;
+  virtual uint64_t NativeInteractiveState() const override;
+  virtual int32_t IndexInParent() const override;
+  virtual Relation RelationByType(RelationType aType) const override;
+  virtual Accessible* FocusedChild() override;
+  virtual void SetSelected(bool aSelect) override;
+  virtual void TakeFocus() const override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() const override;
+  virtual bool HasPrimaryAction() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) const override;
+
+  // Widgets
+  virtual LocalAccessible* ContainerWidget() const override;
+
+  /**
+   * 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(
+      nsTreeColumn* 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 };
+
+  // LocalAccessible
+  MOZ_CAN_RUN_SCRIPT
+  virtual void DispatchClickEvent(nsIContent* aContent,
+                                  uint32_t aActionIndex) const override;
+  virtual LocalAccessible* GetSiblingAtOffset(
+      int32_t aOffset, nsresult* aError = nullptr) const override;
+
+  // XULTreeItemAccessibleBase
+
+  /**
+   * Return true if the tree item accessible is expandable (contains subrows).
+   */
+  bool IsExpandable() const;
+
+  /**
+   * Return name for cell at the given column.
+   */
+  void GetCellName(nsTreeColumn* aColumn, nsAString& aName) const;
+
+  RefPtr<dom::XULTreeElement> mTree;
+  nsITreeView* mTreeView;
+  int32_t mRow;
+};
+
+/**
+ * LocalAccessible class for items for XUL tree.
+ */
+class XULTreeItemAccessible : public XULTreeItemAccessibleBase {
+ public:
+  XULTreeItemAccessible(nsIContent* aContent, DocAccessible* aDoc,
+                        LocalAccessible* aParent, dom::XULTreeElement* aTree,
+                        nsITreeView* aTreeView, int32_t aRow);
+
+  // nsISupports and cycle collection
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeItemAccessible,
+                                           XULTreeItemAccessibleBase)
+
+  // LocalAccessible
+  virtual void Shutdown() override;
+  virtual ENameValueFlag Name(nsString& aName) const override;
+  virtual a11y::role NativeRole() const override;
+
+  // XULTreeItemAccessibleBase
+  virtual void RowInvalidated(int32_t aStartColIdx,
+                              int32_t aEndColIdx) override;
+
+ protected:
+  virtual ~XULTreeItemAccessible();
+
+  // XULTreeItemAccessible
+  RefPtr<nsTreeColumn> mColumn;
+  nsString mCachedName;
+};
+
+/**
+ * LocalAccessible class for columns element of XUL tree.
+ */
+class XULTreeColumAccessible : public XULColumAccessible {
+ public:
+  XULTreeColumAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+ protected:
+  // LocalAccessible
+  virtual LocalAccessible* GetSiblingAtOffset(
+      int32_t aOffset, nsresult* aError = nullptr) const override;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible downcasting method
+
+inline XULTreeAccessible* LocalAccessible::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 0000000000..9b2e0cec33
--- /dev/null
+++ b/accessible/xul/XULTreeGridAccessible.cpp
@@ -0,0 +1,666 @@
+/* -*- 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 "XULTreeGridAccessible.h"
+
+#include <stdint.h>
+#include "AccAttributes.h"
+#include "LocalAccessible-inl.h"
+#include "nsAccCache.h"
+#include "nsAccessibilityService.h"
+#include "nsAccUtils.h"
+#include "DocAccessible.h"
+#include "nsEventShell.h"
+#include "Relation.h"
+#include "mozilla/a11y/Role.h"
+#include "States.h"
+#include "nsQueryObject.h"
+#include "nsTreeColumns.h"
+
+#include "nsITreeSelection.h"
+#include "nsComponentManagerUtils.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/a11y/TableAccessible.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/TreeColumnBinding.h"
+#include "mozilla/dom/XULTreeElementBinding.h"
+
+using namespace mozilla::a11y;
+using namespace mozilla;
+
+XULTreeGridAccessible::~XULTreeGridAccessible() {}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridAccessible: Table
+
+uint32_t XULTreeGridAccessible::ColCount() const {
+  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++) {
+        LocalAccessible* 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);
+  }
+}
+
+LocalAccessible* XULTreeGridAccessible::CellAt(uint32_t aRowIndex,
+                                               uint32_t aColumnIndex) {
+  XULTreeItemAccessibleBase* rowAcc = GetTreeItemAccessible(aRowIndex);
+  if (!rowAcc) return nullptr;
+
+  RefPtr<nsTreeColumn> column =
+      nsCoreUtils::GetSensibleColumnAt(mTree, aColumnIndex);
+  if (!column) return nullptr;
+
+  return rowAcc->GetCellAccessible(column);
+}
+
+void XULTreeGridAccessible::ColDescription(uint32_t aColIdx,
+                                           nsString& aDescription) {
+  aDescription.Truncate();
+
+  LocalAccessible* treeColumns = LocalAccessible::LocalChildAt(0);
+  if (treeColumns) {
+    LocalAccessible* treeColumnItem = treeColumns->LocalChildAt(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);
+}
+
+int32_t XULTreeGridAccessible::ColIndexAt(uint32_t aCellIdx) {
+  uint32_t colCount = ColCount();
+  if (colCount < 1 || aCellIdx >= colCount * RowCount()) {
+    return -1;  // Error: column count is 0 or index out of bounds.
+  }
+
+  return static_cast<int32_t>(aCellIdx % colCount);
+}
+
+int32_t XULTreeGridAccessible::RowIndexAt(uint32_t aCellIdx) {
+  uint32_t colCount = ColCount();
+  if (colCount < 1 || aCellIdx >= colCount * RowCount()) {
+    return -1;  // Error: column count is 0 or index out of bounds.
+  }
+
+  return static_cast<int32_t>(aCellIdx / colCount);
+}
+
+void XULTreeGridAccessible::RowAndColIndicesAt(uint32_t aCellIdx,
+                                               int32_t* aRowIdx,
+                                               int32_t* aColIdx) {
+  uint32_t colCount = ColCount();
+  if (colCount < 1 || aCellIdx >= colCount * RowCount()) {
+    *aRowIdx = -1;
+    *aColIdx = -1;
+    return;  // Error: column count is 0 or index out of bounds.
+  }
+
+  *aRowIdx = static_cast<int32_t>(aCellIdx / colCount);
+  *aColIdx = static_cast<int32_t>(aCellIdx % colCount);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridAccessible: LocalAccessible implementation
+
+role XULTreeGridAccessible::NativeRole() const {
+  RefPtr<nsTreeColumns> treeColumns = mTree->GetColumns(FlushType::None);
+  if (!treeColumns) {
+    NS_ERROR("No treecolumns object for tree!");
+    return roles::NOTHING;
+  }
+
+  nsTreeColumn* primaryColumn = treeColumns->GetPrimaryColumn();
+
+  return primaryColumn ? roles::TREE_TABLE : roles::TABLE;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridAccessible: XULTreeAccessible implementation
+
+already_AddRefed<XULTreeItemAccessibleBase>
+XULTreeGridAccessible::CreateTreeItemAccessible(int32_t aRow) const {
+  RefPtr<XULTreeItemAccessibleBase> accessible = new XULTreeGridRowAccessible(
+      mContent, mDoc, const_cast<XULTreeGridAccessible*>(this), mTree,
+      mTreeView, aRow);
+
+  return accessible.forget();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridRowAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+XULTreeGridRowAccessible::XULTreeGridRowAccessible(
+    nsIContent* aContent, DocAccessible* aDoc, LocalAccessible* aTreeAcc,
+    dom::XULTreeElement* 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(XULTreeGridRowAccessible)
+NS_INTERFACE_MAP_END_INHERITING(XULTreeItemAccessibleBase)
+
+NS_IMPL_ADDREF_INHERITED(XULTreeGridRowAccessible, XULTreeItemAccessibleBase)
+NS_IMPL_RELEASE_INHERITED(XULTreeGridRowAccessible, XULTreeItemAccessibleBase)
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridRowAccessible: LocalAccessible implementation
+
+void XULTreeGridRowAccessible::Shutdown() {
+  if (mDoc && !mDoc->IsDefunct()) {
+    UnbindCacheEntriesFromDocument(mAccessibleCache);
+  }
+
+  XULTreeItemAccessibleBase::Shutdown();
+}
+
+role XULTreeGridRowAccessible::NativeRole() const { return roles::ROW; }
+
+ENameValueFlag XULTreeGridRowAccessible::Name(nsString& aName) const {
+  aName.Truncate();
+
+  // XXX: the row name sholdn't be a concatenation of cell names (bug 664384).
+  RefPtr<nsTreeColumn> 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;
+}
+
+LocalAccessible* XULTreeGridRowAccessible::LocalChildAtPoint(
+    int32_t aX, int32_t aY, EWhichChildAtPoint aWhichChild) {
+  nsIFrame* frame = GetFrame();
+  if (!frame) return nullptr;
+
+  nsPresContext* presContext = frame->PresContext();
+  PresShell* presShell = presContext->PresShell();
+
+  nsIFrame* rootFrame = presShell->GetRootFrame();
+  NS_ENSURE_TRUE(rootFrame, nullptr);
+
+  CSSIntRect rootRect = rootFrame->GetScreenRect();
+
+  int32_t clientX = presContext->DevPixelsToIntCSSPixels(aX) - rootRect.X();
+  int32_t clientY = presContext->DevPixelsToIntCSSPixels(aY) - rootRect.Y();
+
+  ErrorResult rv;
+  dom::TreeCellInfo cellInfo;
+  mTree->GetCellAt(clientX, clientY, cellInfo, rv);
+
+  // Return if we failed to find tree cell in the row for the given point.
+  if (cellInfo.mRow != mRow || !cellInfo.mCol) return nullptr;
+
+  return GetCellAccessible(cellInfo.mCol);
+}
+
+LocalAccessible* XULTreeGridRowAccessible::LocalChildAt(uint32_t aIndex) const {
+  if (IsDefunct()) return nullptr;
+
+  RefPtr<nsTreeColumn> 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(
+    nsTreeColumn* aColumn) const {
+  MOZ_ASSERT(aColumn, "No tree column!");
+
+  void* key = static_cast<void*>(aColumn);
+  XULTreeGridCellAccessible* cachedCell = mAccessibleCache.GetWeak(key);
+  if (cachedCell) return cachedCell;
+
+  RefPtr<XULTreeGridCellAccessible> cell = new XULTreeGridCellAccessible(
+      mContent, mDoc, const_cast<XULTreeGridRowAccessible*>(this), mTree,
+      mTreeView, mRow, aColumn);
+  mAccessibleCache.InsertOrUpdate(key, RefPtr{cell});
+  Document()->BindToDocument(cell, nullptr);
+  return cell;
+}
+
+void XULTreeGridRowAccessible::RowInvalidated(int32_t aStartColIdx,
+                                              int32_t aEndColIdx) {
+  RefPtr<nsTreeColumns> treeColumns = mTree->GetColumns(FlushType::None);
+  if (!treeColumns) return;
+
+  bool nameChanged = false;
+  for (int32_t colIdx = aStartColIdx; colIdx <= aEndColIdx; ++colIdx) {
+    nsTreeColumn* column = treeColumns->GetColumnAt(colIdx);
+    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, dom::XULTreeElement* aTree,
+    nsITreeView* aTreeView, int32_t aRow, nsTreeColumn* aColumn)
+    : LeafAccessible(aContent, aDoc),
+      mTree(aTree),
+      mTreeView(aTreeView),
+      mRow(aRow),
+      mColumn(aColumn) {
+  mParent = aRowAcc;
+  mStateFlags |= eSharedNode;
+  mGenericTypes |= eTableCell;
+
+  NS_ASSERTION(mTreeView, "mTreeView is null");
+
+  if (mColumn->Type() == dom::TreeColumn_Binding::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(XULTreeGridCellAccessible)
+NS_INTERFACE_MAP_END_INHERITING(LeafAccessible)
+NS_IMPL_ADDREF_INHERITED(XULTreeGridCellAccessible, LeafAccessible)
+NS_IMPL_RELEASE_INHERITED(XULTreeGridCellAccessible, LeafAccessible)
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridCellAccessible: LocalAccessible
+
+void XULTreeGridCellAccessible::Shutdown() {
+  mTree = nullptr;
+  mTreeView = nullptr;
+  mRow = -1;
+  mColumn = nullptr;
+  mParent = nullptr;  // null-out to prevent base class's shutdown ops
+
+  LeafAccessible::Shutdown();
+}
+
+Accessible* XULTreeGridCellAccessible::FocusedChild() { return nullptr; }
+
+ENameValueFlag XULTreeGridCellAccessible::Name(nsString& aName) const {
+  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::BoundsInCSSPixels() const {
+  // Get bounds for tree cell and add x and y of treechildren element to
+  // x and y of the cell.
+  nsresult rv;
+  nsIntRect rect = mTree->GetCoordsForCellItem(mRow, mColumn, u"cell"_ns, rv);
+  if (NS_FAILED(rv)) {
+    return nsIntRect();
+  }
+
+  RefPtr<dom::Element> bodyElement = mTree->GetTreeBody();
+  if (!bodyElement || !bodyElement->IsXULElement()) {
+    return nsIntRect();
+  }
+
+  nsIFrame* bodyFrame = bodyElement->GetPrimaryFrame();
+  if (!bodyFrame) {
+    return nsIntRect();
+  }
+
+  CSSIntRect screenRect = bodyFrame->GetScreenRect();
+  rect.x += screenRect.x;
+  rect.y += screenRect.y;
+  return rect;
+}
+
+nsRect XULTreeGridCellAccessible::BoundsInAppUnits() const {
+  nsIntRect bounds = BoundsInCSSPixels();
+  nsPresContext* presContext = mDoc->PresContext();
+  return nsRect(presContext->CSSPixelsToAppUnits(bounds.X()),
+                presContext->CSSPixelsToAppUnits(bounds.Y()),
+                presContext->CSSPixelsToAppUnits(bounds.Width()),
+                presContext->CSSPixelsToAppUnits(bounds.Height()));
+}
+
+bool XULTreeGridCellAccessible::HasPrimaryAction() const {
+  return mColumn->Cycler() ||
+         (mColumn->Type() == dom::TreeColumn_Binding::TYPE_CHECKBOX &&
+          IsEditable());
+}
+
+void XULTreeGridCellAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
+  aName.Truncate();
+
+  if (aIndex != eAction_Click || !mTreeView) return;
+
+  if (mColumn->Cycler()) {
+    aName.AssignLiteral("cycle");
+    return;
+  }
+
+  if (mColumn->Type() == dom::TreeColumn_Binding::TYPE_CHECKBOX &&
+      IsEditable()) {
+    nsAutoString value;
+    mTreeView->GetCellValue(mRow, mColumn, value);
+    if (value.EqualsLiteral("true")) {
+      aName.AssignLiteral("uncheck");
+    } else {
+      aName.AssignLiteral("check");
+    }
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridCellAccessible: TableCell
+
+TableAccessible* XULTreeGridCellAccessible::Table() const {
+  LocalAccessible* grandParent = mParent->LocalParent();
+  if (grandParent) return grandParent->AsTable();
+
+  return nullptr;
+}
+
+uint32_t XULTreeGridCellAccessible::ColIdx() const {
+  uint32_t colIdx = 0;
+  RefPtr<nsTreeColumn> column = mColumn;
+  while ((column = nsCoreUtils::GetPreviousSensibleColumn(column))) colIdx++;
+
+  return colIdx;
+}
+
+uint32_t XULTreeGridCellAccessible::RowIdx() const { return mRow; }
+
+void XULTreeGridCellAccessible::ColHeaderCells(
+    nsTArray<Accessible*>* aHeaderCells) {
+  dom::Element* columnElm = mColumn->Element();
+
+  LocalAccessible* headerCell = mDoc->GetAccessible(columnElm);
+  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: LocalAccessible public implementation
+
+already_AddRefed<AccAttributes> XULTreeGridCellAccessible::NativeAttributes() {
+  RefPtr<AccAttributes> attributes = new AccAttributes();
+
+  // "table-cell-index" attribute
+  TableAccessible* table = Table();
+  if (!table) return attributes.forget();
+
+  attributes->SetAttribute(nsGkAtoms::tableCellIndex,
+                           table->CellIndexAt(mRow, ColIdx()));
+
+  // "cycles" attribute
+  if (mColumn->Cycler()) {
+    attributes->SetAttribute(nsGkAtoms::cycles, true);
+  }
+
+  return attributes.forget();
+}
+
+role XULTreeGridCellAccessible::NativeRole() const { return roles::GRID_CELL; }
+
+uint64_t XULTreeGridCellAccessible::NativeState() const {
+  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
+  if (mColumn->Type() == dom::TreeColumn_Binding::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) const {
+  return Relation();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// XULTreeGridCellAccessible: public implementation
+
+bool XULTreeGridCellAccessible::CellInvalidated() {
+  nsAutoString textEquiv;
+
+  if (mColumn->Type() == dom::TreeColumn_Binding::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: LocalAccessible protected implementation
+
+LocalAccessible* XULTreeGridCellAccessible::GetSiblingAtOffset(
+    int32_t aOffset, nsresult* aError) const {
+  if (aError) *aError = NS_OK;  // fail peacefully
+
+  RefPtr<nsTreeColumn> 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;
+
+  XULTreeItemAccessibleBase* rowAcc =
+      static_cast<XULTreeItemAccessibleBase*>(LocalParent());
+  return rowAcc->GetCellAccessible(columnAtOffset);
+}
+
+void XULTreeGridCellAccessible::DispatchClickEvent(
+    nsIContent* aContent, uint32_t aActionIndex) const {
+  if (IsDefunct()) return;
+
+  RefPtr<dom::XULTreeElement> tree = mTree;
+  RefPtr<nsTreeColumn> column = mColumn;
+  nsCoreUtils::DispatchClickEvent(tree, mRow, column);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// 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;
+
+  dom::Element* columnElm = mColumn->Element();
+
+  if (!columnElm->AttrValueIs(kNameSpaceID_None, nsGkAtoms::editable,
+                              nsGkAtoms::_true, eCaseMatters)) {
+    return false;
+  }
+
+  return mContent->AsElement()->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 0000000000..cfb314d30e
--- /dev/null
+++ b/accessible/xul/XULTreeGridAccessible.h
@@ -0,0 +1,193 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* -*- 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 "mozilla/a11y/TableAccessible.h"
+#include "mozilla/a11y/TableCellAccessible.h"
+#include "XULTreeAccessible.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() const override;
+  virtual uint32_t RowCount() override;
+  virtual LocalAccessible* 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 LocalAccessible* AsAccessible() override { return this; }
+
+  virtual int32_t CellIndexAt(uint32_t aRowIdx, uint32_t aColIdx) override {
+    return static_cast<int32_t>(ColCount() * aRowIdx + aColIdx);
+  }
+
+  virtual int32_t ColIndexAt(uint32_t aCellIdx) override;
+  virtual int32_t RowIndexAt(uint32_t aCellIdx) override;
+  virtual void RowAndColIndicesAt(uint32_t aCellIdx, int32_t* aRowIdx,
+                                  int32_t* aColIdx) override;
+
+  // LocalAccessible
+  virtual TableAccessible* AsTable() override { return this; }
+  virtual a11y::role NativeRole() const override;
+
+ protected:
+  virtual ~XULTreeGridAccessible();
+
+  // XULTreeAccessible
+  virtual already_AddRefed<XULTreeItemAccessibleBase> 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 LocalAccessible::LocalChildAt;
+
+  XULTreeGridRowAccessible(nsIContent* aContent, DocAccessible* aDoc,
+                           LocalAccessible* aParent, dom::XULTreeElement* aTree,
+                           nsITreeView* aTreeView, int32_t aRow);
+
+  // nsISupports and cycle collection
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeGridRowAccessible,
+                                           XULTreeItemAccessibleBase)
+
+  // LocalAccessible
+  virtual void Shutdown() override;
+  virtual a11y::role NativeRole() const override;
+  virtual ENameValueFlag Name(nsString& aName) const override;
+  virtual LocalAccessible* LocalChildAtPoint(
+      int32_t aX, int32_t aY, EWhichChildAtPoint aWhichChild) override;
+
+  virtual LocalAccessible* LocalChildAt(uint32_t aIndex) const override;
+  virtual uint32_t ChildCount() const override;
+
+  // XULTreeItemAccessibleBase
+  XULTreeGridCellAccessible* GetCellAccessible(
+      nsTreeColumn* aColumn) const 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,
+                            dom::XULTreeElement* aTree, nsITreeView* aTreeView,
+                            int32_t aRow, nsTreeColumn* aColumn);
+
+  // nsISupports
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeGridCellAccessible,
+                                           LeafAccessible)
+
+  // LocalAccessible
+  virtual void Shutdown() override;
+  virtual TableCellAccessible* AsTableCell() override { return this; }
+  virtual nsRect BoundsInAppUnits() const override;
+  virtual nsIntRect BoundsInCSSPixels() const override;
+  virtual ENameValueFlag Name(nsString& aName) const override;
+  virtual Accessible* FocusedChild() override;
+  virtual already_AddRefed<AccAttributes> NativeAttributes() override;
+  virtual int32_t IndexInParent() const override;
+  virtual Relation RelationByType(RelationType aType) const override;
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual uint64_t NativeInteractiveState() const override;
+
+  // ActionAccessible
+  virtual bool HasPrimaryAction() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) 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();
+
+  // LocalAccessible
+  virtual LocalAccessible* GetSiblingAtOffset(
+      int32_t aOffset, nsresult* aError = nullptr) const override;
+  MOZ_CAN_RUN_SCRIPT
+  virtual void DispatchClickEvent(nsIContent* aContent,
+                                  uint32_t aActionIndex) const override;
+
+  // XULTreeGridCellAccessible
+
+  /**
+   * Return true if value of cell can be modified.
+   */
+  bool IsEditable() const;
+
+  enum { eAction_Click = 0 };
+
+  RefPtr<dom::XULTreeElement> mTree;
+  nsITreeView* mTreeView;
+
+  int32_t mRow;
+  RefPtr<nsTreeColumn> 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 0000000000..4fccfff6e0
--- /dev/null
+++ b/accessible/xul/moz.build
@@ -0,0 +1,56 @@
+# -*- 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",
+    "XULComboboxAccessible.cpp",
+    "XULElementAccessibles.cpp",
+    "XULFormControlAccessible.cpp",
+    "XULListboxAccessible.cpp",
+    "XULMenuAccessible.cpp",
+    "XULSelectControlAccessible.cpp",
+    "XULTabAccessible.cpp",
+    "XULTreeAccessible.cpp",
+    "XULTreeGridAccessible.cpp",
+]
+
+LOCAL_INCLUDES += [
+    "/accessible/base",
+    "/accessible/generic",
+    "/accessible/html",
+    "/accessible/xpcom",
+    "/dom/base",
+    "/dom/xul",
+    "/layout/generic",
+    "/layout/xul",
+    "/layout/xul/tree",
+]
+
+if CONFIG["MOZ_WIDGET_TOOLKIT"] == "gtk":
+    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",
+    ]
+elif CONFIG["MOZ_WIDGET_TOOLKIT"] == "android":
+    LOCAL_INCLUDES += [
+        "/accessible/android",
+    ]
+else:
+    LOCAL_INCLUDES += [
+        "/accessible/other",
+    ]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul"