Firefox 6 - Error Console Msgs for rfhelper32.js line 348

I updated my Firefox browser to the lastest version 6 release and immediately started to get the following message on the Firefox Error Console for almost all websites:

 

Error: [Exception... "Could not convert JavaScript argument arg 0 [nsISupports.QueryInterface]"  nsresult: "0x80570009 (NS_ERROR_XPC_BAD_CONVERT_JS)"  location: "JS frame :: file:///C:/Program%20Files/Norton%20Internet%20Security/Engine/18.6.0.29/rfhelper32.js :: <TOP_LEVEL> :: line 348"  data: no]
Source File: file:///C:/Program%20Files/Norton%20Internet%20Security/Engine/18.6.0.29/rfhelper32.js
Line: 348

 

I noticed that Norton has sent out fixes for the Firefox 6 / Norton toolbar problem, but was wondering if there is something that can fix the above error messages  I continually ran my Norton Live Updates until there were no more to intall.  I then rebooted my PC.  I am still getting the above mentioned error message.

 

I believe this is the Norton JS to which Firefox is pointing:

 345       case "DOMViewCSS_GetComputedStyle":
 346           return new RFLoadGroup( function(aRequest, aElem) {
 347               var callback = aRequest.QueryInterface(CI.nsISupportsInterfacePointer);
 348               callback.data = aElem.QueryInterface(CI.nsIDOMViewCSS).getComputedStyle(callback.data, '');
 349           } );


This slows down firefox and continually pops up on the error console.  Any help would be appreciated.