I'm testing your FF addon and I've noticed that when the password of the e-mail account ends with a bracket X-notifier can't login and check the number of unread emails.
301 * OK MC-link IMAP Server ready\r\n
302 A214 NO incorrect password or account name\r\n
sorry for my english.
ciao!
Old joke
Patient: "Doctor! It hurts when I do this!"
Doctor: "Don't do it."