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diff --git a/webbrowser/components/preferences/selectBookmark.js b/webbrowser/components/preferences/selectBookmark.js
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+++ b/webbrowser/components/preferences/selectBookmark.js
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+//* -*- Mode: C++; tab-width: 8; 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/. */
+
+/**
+ * SelectBookmarkDialog controls the user interface for the "Use Bookmark for
+ * Home Page" dialog. 
+ * 
+ * The caller (gMainPane.setHomePageToBookmark in main.js) invokes this dialog
+ * with a single argument - a reference to an object with a .urls property and
+ * a .names property.  This dialog is responsible for updating the contents of
+ * the .urls property with an array of URLs to use as home pages and for
+ * updating the .names property with an array of names for those URLs before it
+ * closes.
+ */ 
+var SelectBookmarkDialog = {
+  init: function SBD_init() {
+    document.getElementById("bookmarks").place =
+      "place:queryType=1&folder=" + PlacesUIUtils.allBookmarksFolderId;
+
+    // Initial update of the OK button.
+    this.selectionChanged();
+  },
+
+  /** 
+   * Update the disabled state of the OK button as the user changes the 
+   * selection within the view. 
+   */
+  selectionChanged: function SBD_selectionChanged() {
+    var accept = document.documentElement.getButton("accept");
+    var bookmarks = document.getElementById("bookmarks");
+    var disableAcceptButton = true;
+    if (bookmarks.hasSelection) {
+      if (!PlacesUtils.nodeIsSeparator(bookmarks.selectedNode))
+        disableAcceptButton = false;
+    }
+    accept.disabled = disableAcceptButton;
+  },
+
+  onItemDblClick: function SBD_onItemDblClick() {
+    var bookmarks = document.getElementById("bookmarks");
+    var selectedNode = bookmarks.selectedNode;
+    if (selectedNode && PlacesUtils.nodeIsURI(selectedNode)) {
+      /**
+       * The user has double clicked on a tree row that is a link. Take this to
+       * mean that they want that link to be their homepage, and close the dialog.
+       */
+      document.documentElement.getButton("accept").click();
+    }
+  },
+
+  /**
+   * User accepts their selection. Set all the selected URLs or the contents
+   * of the selected folder as the list of homepages.
+   */
+  accept: function SBD_accept() {
+    var bookmarks = document.getElementById("bookmarks");
+    NS_ASSERT(bookmarks.hasSelection,
+              "Should not be able to accept dialog if there is no selected URL!");
+    var urls = [];
+    var names = [];
+    var selectedNode = bookmarks.selectedNode;
+    if (PlacesUtils.nodeIsFolder(selectedNode)) {
+      var contents = PlacesUtils.getFolderContents(selectedNode.itemId).root;
+      var cc = contents.childCount;
+      for (var i = 0; i < cc; ++i) {
+        var node = contents.getChild(i);
+        if (PlacesUtils.nodeIsURI(node)) {
+          urls.push(node.uri);
+          names.push(node.title);
+        }
+      }
+      contents.containerOpen = false;
+    }
+    else {
+      urls.push(selectedNode.uri);
+      names.push(selectedNode.title);
+    }
+    window.arguments[0].urls = urls;
+    window.arguments[0].names = names;
+  }
+};