Rated 3 out of 5 stars

I wanted to cull out some RSS element based on their website ('content-base' header), but unfortunately that extension does not offers this as a criteria for fiding dups.

Αυτή η αξιολόγηση γράφτηκε για παλιότερη έκδοση του πρόσθετου (0.3.16). 

Nobody's requested this before; file a feature request and we'll see.

... having said that, Thunderbird might not be exposing this to me anyway.