add:   if (window.arguments[0].folderURI) document.getElementById('rssAccountMenuItem').setAttribute('disabled', 'true'); 
context: function onLoad(){   if (window.arguments[0].feedLocation)    document.getElementById('feedLocation').value = window.arguments[0].feedLocation;    // root the location picker to the news & blogs server  document.getElementById('selectFolder').setAttribute('ref', window.arguments[0].serverURI);  SetFolderPicker(window.arguments[0].folderURI ? window.arguments[0].folderURI : window.arguments[0].serverURI, 'selectFolder');  document.getElementById('rssAccountMenuItem').label = window.arguments[0].serverPrettyName;  document.getElementById('rssAccountMenuItem').value = window.arguments[0].serverURI;  // set quick mode value  document.getElementById('quickMode').checked = window.arguments[0].quickMode;}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/30327fd8d82a1712e5b1f0a7eadb228d32b79c74/feed-properties.js/buggy/mail/extensions/newsblog/content/feed-properties.js