rem: var makeDefaultFeedClient = document.getElementById('mail.checkDefaultFeed').value; 
add: var makeDefaultFeedClient = document.getElementById('mail.checkDefaultFeed').value; 
context:   onWriteDefaultFeed: function()  {    var mapiRegistry = Components.classes["@mozilla.org/mapiregistry;1"].getService(Components.interfaces.nsIMapiRegistry);    var makeDefaultFeedClient = document.getElementById('mail.checkDefaultFeed').value;       if (mapiRegistry.isDefaultFeedClient != makeDefaultFeedClient)       mapiRegistry.isDefaultFeedClient = makeDefaultFeedClient;  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/8feb50a6c9b117506dc15bbd2d7857a5ca3acc15/general.js/clean/mail/components/preferences/general.js