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But can it works with RSS-accounts?

이 검토는 현재 부가 기능의 이전 (0.9.1) 버전에 대한 것입니다. 

Archiving of RSS accounts is not possible in Thunderbird. Therefore the addon can't do it.

Maybe you can create a Filter which moves the RSS messages to a folder inside a POP3 account. Then you can archive this one. Sounds a bit tricky but may work.