rem: try { var uri = Components.classes["@mozilla.org/network/standard-url;1"].createInstance(Components.interfaces.nsIURI); uri.spec = sourceURL; return uri; } catch (e) { return null; 
add: if (sourceURL) { try { return makeURL(sourceURL); } catch (e) { } 
context: function getReferrer(doc){  var focusedWindow = doc.commandDispatcher.focusedWindow;  var sourceURL = getContentFrameURI(focusedWindow);  try {    var uri = Components.classes["@mozilla.org/network/standard-url;1"].createInstance(Components.interfaces.nsIURI);    uri.spec = sourceURL;    return uri;  } catch (e) {    return null;  }}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/a25f95dce58f7ef842d66b3ca9dbdd307204a02e/contentAreaUtils.js/buggy/toolkit/content/contentAreaUtils.js