rem: em.update(gUpdateWizard.items, gUpdateWizard.items.length, true, this); 
add:   em.update([], 0, 2, this); 
context:   onPageShow: function ()  {    gUpdateWizard.setButtonLabels(null, true,                                   "nextButtonText", true,                                   "cancelButtonText", false);    var em = Components.classes["@mozilla.org/extensions/manager;1"]                       .getService(Components.interfaces.nsIExtensionManager);    em.update(gUpdateWizard.items, gUpdateWizard.items.length, true, this);  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/31a1a1c480acd5fd3ebad2e19d0d25fb2df73af3/update.js/clean/toolkit/mozapps/extensions/content/update.js