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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.

Tato recenze je pro předchozí verzi doplňku (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.