rem: document.getElementById('web-panels-browser').webProgress.removeProgressListener(panelProgressListener); 
add: var panelBrowser = document.getElementById('web-panels-browser'); panelBrowser.webProgress.removeProgressListener(panelProgressListener); 
context: function unload(){  document.getElementById('web-panels-browser').webProgress.removeProgressListener(panelProgressListener);}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/797cc1670414f92244b4e47ab24db98a73ec8039/web-panels.js/clean/browser/base/content/web-panels.js