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diff --git a/accessible/xul/XULTreeGridAccessible.h b/accessible/xul/XULTreeGridAccessible.h
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+++ b/accessible/xul/XULTreeGridAccessible.h
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+/* -*- 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