add: UpdateBackForwardCommands(getPanelBrowser().webNavigation); 
context:     onLocationChange : function(aWebProgress, aRequest, aLocation) {    },
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8395/691b0217b61c2a19648b4ffd345085cb562d75a1/web-panels.js/clean/browser/base/content/web-panels.js