Rated 5 out of 5 stars

per Nick222 el gen. 14, 2014 ·

But can it works with RSS-accounts?

This review is for a previous version of the add-on (0.9.1). 

per Brummolix (desenvolupador) a gen. 15, 2014 ·

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.