diff --git a/mail/extensions/newsblog/content/feed-properties.js b/mail/extensions/newsblog/content/feed-properties.js
index f44186b3ab3..92152454dbd 100644
--- a/mail/extensions/newsblog/content/feed-properties.js
+++ b/mail/extensions/newsblog/content/feed-properties.js
@@ -46,6 +46,10 @@ function onLoad()
 
   // set quick mode value
   document.getElementById('quickMode').checked = window.arguments[0].quickMode;
+
+  // if we are editing an existing feed, disable the top level account
+  if (window.arguments[0].folderURI)
+    document.getElementById('rssAccountMenuItem').setAttribute('disabled', 'true');
 }
 
 function onOk()
diff --git a/mail/extensions/newsblog/content/feed-properties.xul b/mail/extensions/newsblog/content/feed-properties.xul
index b4606587acb..dce27eea51b 100644
--- a/mail/extensions/newsblog/content/feed-properties.xul
+++ b/mail/extensions/newsblog/content/feed-properties.xul
@@ -40,7 +40,7 @@
   xmlns:nc="http://home.netscape.com/NC-rdf#"
   xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
   title="&window.title;"
-  style="width: 27em;"
+  style="width: 30em;"
   buttons="accept,cancel"
   onload="onLoad();"
   ondialogaccept="return onOk();">