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diff --git a/widget/nsITaskbarWindowPreview.idl b/widget/nsITaskbarWindowPreview.idl
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+++ b/widget/nsITaskbarWindowPreview.idl
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+/* vim: se cin sw=2 ts=2 et : */
+/* -*- 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 "nsITaskbarPreview.idl"
+interface nsITaskbarPreviewButton;
+
+/*
+ * nsITaskbarWindowPreview
+ *
+ * This interface represents the preview for a window in the taskbar. By
+ * default, Windows implements much of the behavior for applications by
+ * default. The primary purpose of this interface is to allow Gecko
+ * applications to take control over parts of the preview. Some parts are not
+ * controlled through this interface: the title and icon of the preview match
+ * the title and icon of the window always.
+ *
+ * By default, Windows takes care of drawing the thumbnail and preview for the
+ * application however if enableCustomDrawing is set to true, then the
+ * controller will start to receive requestPreview and requestThumbnail calls
+ * as well as reads on the thumbnailAspectRatio, width and height properties.
+ *
+ * By default, nsITaskbarWindowPreviews are visible. When made invisible, the
+ * window disappears from the list of windows in the taskbar for the
+ * application.
+ *
+ * If the window has any visible nsITaskbarTabPreviews, then the
+ * nsITaskbarWindowPreview for the corresponding window is automatically
+ * hidden. This is not reflected in the visible property. Note that other parts
+ * of the system (such as alt-tab) may still request thumbnails and/or previews
+ * through the nsITaskbarWindowPreview's controller.
+ *
+ * nsITaskbarWindowPreview will never invoke the controller's onClose or
+ * onActivate methods since handling them may conflict with other internal
+ * Gecko state and there is existing infrastructure in place to allow clients
+ * to handle those events
+ *
+ * Window previews may have a toolbar with up to 7 buttons. See
+ * nsITaskbarPreviewButton for more information about button properties.
+ */
+[scriptable, uuid(EC67CC57-342D-4064-B4C6-74A375E07B10)]
+interface nsITaskbarWindowPreview : nsITaskbarPreview
+{
+  /**
+   * Max 7 buttons per preview per the Windows Taskbar API
+   */
+  const long NUM_TOOLBAR_BUTTONS = 7;
+
+  /**
+   * Gets the nth button for the preview image. By default, all of the buttons
+   * are invisible.
+   *
+   * @see nsITaskbarPreviewButton
+   *
+   * @param index The index into the button array. Must be >= 0 and <
+   *              MAX_TOOLBAR_BUTTONS.
+   */
+  nsITaskbarPreviewButton getButton(in unsigned long index);
+
+  /**
+   * Enables/disables custom drawing of thumbnails and previews
+   *
+   * Default value: false
+   */
+  attribute boolean enableCustomDrawing;
+};