rem: var uri = branch.getCharPref("uri"); var title = branch.getCharPref("title"); 
add: var uri = branch.getComplexValue("uri", Ci.nsIPrefLocalizedString).data; var title = branch.getComplexValue("title", Ci.nsIPrefLocalizedString).data; 
context:   _registerContentHandlerWithBranch: function(branch) {    try {      var type = branch.getCharPref("type");      var uri = branch.getCharPref("uri");      var title = branch.getCharPref("title");      this._registerContentHandler(type, uri, title);    }    catch (e) {      return false;    }    return true;  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/229643bc4305793b31e3b4dd48c6b80921a4f144/WebContentConverter.js/clean/browser/components/feeds/src/WebContentConverter.js