rem: var updatesView = document.getElementById("updatesView"); updatesView.setAttribute("showcompletedupdates", checkbox.checked); 
add: this._updatesView.setAttribute("showcompletedupdates", checkbox.checked); 
context:   showCompletedUpdatesChanged: function(checkbox) {    var updatesView = document.getElementById("updatesView");    updatesView.setAttribute("showcompletedupdates", checkbox.checked);  },
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/d1f1b3f7913cefd1c0fb22b627fe0b0252247fbe/updates.js/clean/toolkit/mozapps/update/content/updates.js