// ==UserScript==
// @name           remember sidebar scroll position
// @namespace      http://d.hatena.ne.jp/Cherenkov/
// @description    http://d.hatena.ne.jp/Cherenkov/20090616/p1
// @include        chrome://browser/content/bookmarks/bookmarksPanel.xul
// ==/UserScript==

(function(){
  var gPrefService = Components.classes[
        "@mozilla.org/preferences-service;1"].
            getService( Components.interfaces.nsIPrefBranch);
  document.getElementById("bookmarks-view-children").addEventListener("scroll", function() {
    var getRow = document.getElementById("bookmarks-view").boxObject.getFirstVisibleRow();
    gPrefService.setIntPref("userChrome.bookmarksPanel.rowPosition", getRow);
  },false);

  var pos = gPrefService.getIntPref("userChrome.bookmarksPanel.rowPosition");
  document.getElementById("bookmarks-view").boxObject.scrollToRow(pos);
})();