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Only one question ...
Why is it needed the password for the account when it should be taken from the Password Manager?

Sorry, I'm a little bit paranoid ...

By the way, the add-on is the best I have seen for this task.
Thanks,

Это отзыв для предыдущей версии этого дополнения (0.8.13). 

Victor: the addon stores your password in the password manager in exactly the same way that your POP/IMAP password is stored. The question is reasonable - not paranoid:-) See:
http://www.zindus.com/faq-thunderbird/#toc-security