Rated 5 out of 5 stars

As said by someone else: seeing the sender address rather than some self-selected nonsense name is the very first phishing and spam defense line. In fact it is a global tragedy that mail programs tend to not show it. It would be just great to get this simple and effective plugin back. (Short of mozilla just providing these column by default anyway.)

This review is for a previous version of the add-on (1.0.4).