.getService(Components.interfaces.nsIExtensionManager);   em.update([], 0, 2, this); 
.getService(nsIExtensionManager);  em.update([], 0, nsIExtensionManager.UPDATE_SYNC_COMPATIBILITY, this); 
  onPageShow: function ()  {    gUpdateWizard.setButtonLabels(null, true,                                   "nextButtonText", true,                                   "cancelButtonText", false);    var em = Components.classes["@mozilla.org/extensions/manager;1"]                       .getService(Components.interfaces.nsIExtensionManager);    // Synchronize the app compatibility info for all items by specifying 2 for    // the versionUpdateOnly parameter.    em.update([], 0, 2, this);  },
5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5459/49b77a26304ab41a920ee1235f143945b4ff3d27/update.js/buggy/toolkit/mozapps/extensions/content/update.js