rem: return Components.lookupMethod(contentFrame, 'location').call(contentFrame).href; 
add: if (contentFrame) return Components.lookupMethod(contentFrame, 'location').call(contentFrame).href; else return null; 
context: function getContentFrameURI(aFocusedWindow){  var contentFrame = isContentFrame(aFocusedWindow) ? aFocusedWindow : window.content;  return Components.lookupMethod(contentFrame, 'location').call(contentFrame).href;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/4de60db7461ba9f7ec10506b742c34b4f1dbc223/contentAreaUtils.js/buggy/toolkit/content/contentAreaUtils.js