warning in console

By Dontest , 20 July 2013

When i have a imap account active i receive this warning in console at FF start:

"Timestamp: 20/07/2013 15.24.38
Warning: ReferenceError: reference to undefined property this.viewURL
Source File: jar:file:///C:/Firefox/extensions/%7B37fa1426-b82d-11db-8314-0800200c9a66%7D.xpi!/components/Main.js -> resource://xnotifier/Handler.js
Line: 304"

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X-notifier 3.x for Firefox (deprecated)