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diff --git a/dom/chrome-webidl/XULTreeElement.webidl b/dom/chrome-webidl/XULTreeElement.webidl
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+++ b/dom/chrome-webidl/XULTreeElement.webidl
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+
+/* -*- Mode: IDL; 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/.
+ */
+
+interface MozTreeView;
+
+dictionary TreeCellInfo {
+    long row = 0;
+    TreeColumn? col = null;
+    DOMString childElt = "";
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface XULTreeElement : XULElement
+{
+  [HTMLConstructor] constructor();
+
+  /**
+   * Obtain the columns.
+   */
+  readonly attribute TreeColumns? columns;
+
+  /**
+   * The view that backs the tree and that supplies it with its data.
+   * It is dynamically settable, either using a view attribute on the
+   * tree tag or by setting this attribute to a new value.
+   */
+  [SetterThrows, NeedsCallerType]
+  attribute MozTreeView? view;
+
+  /**
+   * Whether or not we are currently focused.
+   */
+  attribute boolean focused;
+
+  /**
+   * Obtain the treebody content node
+   */
+  readonly attribute Element? treeBody;
+
+  /**
+   * Obtain the height of a row.
+   */
+  readonly attribute long rowHeight;
+
+  /**
+   * Obtain the width of a row.
+   */
+  readonly attribute long rowWidth;
+
+  /**
+   * Get the pixel position of the horizontal scrollbar.
+   */
+  readonly attribute long horizontalPosition;
+
+  /**
+   * Get the index of the first visible row.
+   */
+  long getFirstVisibleRow();
+
+  /**
+   * Get the index of the last visible row.
+   */
+  long getLastVisibleRow();
+
+  /**
+   * Gets the number of possible visible rows.
+   */
+  long getPageLength();
+
+  /**
+   * Ensures that a row at a given index is visible.
+   */
+  undefined ensureRowIsVisible(long index);
+
+  /**
+   * Ensures that a given cell in the tree is visible.
+   */
+  [Throws]
+  undefined ensureCellIsVisible(long row, TreeColumn? col);
+
+  /**
+   * Scrolls such that the row at index is at the top of the visible view.
+   */
+  undefined scrollToRow(long index);
+
+  /**
+   * Scroll the tree up or down by numLines lines. Positive
+   * values move down in the tree. Prevents scrolling off the
+   * end of the tree.
+   */
+  undefined scrollByLines(long numLines);
+
+  /**
+   * Scroll the tree up or down by numPages pages. A page
+   * is considered to be the amount displayed by the tree.
+   * Positive values move down in the tree. Prevents scrolling
+   * off the end of the tree.
+   */
+  undefined scrollByPages(long numPages);
+
+  /**
+   * Invalidation methods for fine-grained painting control.
+   */
+  undefined invalidate();
+  undefined invalidateColumn(TreeColumn? col);
+  undefined invalidateRow(long index);
+  undefined invalidateCell(long row, TreeColumn? col);
+  undefined invalidateRange(long startIndex, long endIndex);
+
+  /**
+   * A hit test that can tell you what row the mouse is over.
+   * returns -1 for invalid mouse coordinates.
+   *
+   * The coordinate system is the client coordinate system for the
+   * document this tree lives in, and the units are CSS pixels.
+   */
+  long getRowAt(long x, long y);
+
+  /**
+   * A hit test that can tell you what cell the mouse is over.
+   * TreeCellInfo.row is the row index hit,  returns -1 for invalid mouse
+   * coordinates.  TreeCellInfo.col is the column hit.
+   * TreeCellInfo.childElt is the pseudoelement hit: this can have values of
+   * "cell", "twisty", "image", and "text".
+   *
+   * The coordinate system is the client coordinate system for the
+   * document this tree lives in, and the units are CSS pixels.
+   */
+  [Throws]
+  TreeCellInfo getCellAt(long x, long y);
+
+  /**
+   * Find the coordinates of an element within a specific cell.
+   */
+  [Throws]
+  DOMRect? getCoordsForCellItem(long row, TreeColumn col, DOMString element);
+
+  /**
+   * Determine if the text of a cell is being cropped or not.
+   */
+  [Throws]
+  boolean isCellCropped(long row, TreeColumn? col);
+
+  /**
+   * The view is responsible for calling these notification methods when
+   * rows are added or removed.  Index is the position at which the new
+   * rows were added or at which rows were removed.  For
+   * non-contiguous additions/removals, this method should be called multiple times.
+   */
+  undefined rowCountChanged(long index, long count);
+
+  /**
+   * Notify the tree that the view is about to perform a batch
+   * update, that is, add, remove or invalidate several rows at once.
+   * This must be followed by calling endUpdateBatch(), otherwise the tree
+   * will get out of sync.
+   */
+  undefined beginUpdateBatch();
+
+  /**
+   * Notify the tree that the view has completed a batch update.
+   */
+  undefined endUpdateBatch();
+
+  /**
+   * Called on a theme switch to flush out the tree's style and image caches.
+   */
+  undefined clearStyleAndImageCaches();
+
+  /**
+   * Remove an image source from the image cache to allow its invalidation.
+   */
+  [Throws]
+  undefined removeImageCacheEntry(long row, TreeColumn col);
+};