rem: return getBrowser().webNavigation; 
add: return gBrowser.webNavigation; 
context: function getWebNavigation(){  try {    return getBrowser().webNavigation;  } catch (e) {    return null;  }}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/b703a680af1d3650d75e6299dc72687209924f3d/browser.js/clean/browser/base/content/browser.js