Rated 3 out of 5 stars

Pretty good, but a couple of suggestions for improvement:

The "display name" for senders not in the address book is shown in brackets: this is irritating. Also, it should be called "sender display name" in the message list pane, not "display name", as this is confusing.

Secondly, it would be helpful for some modifications to be made such that emails from services like facebook, which don't necessarily send from exactly the same address each time, could be detected. Obviously, I can simply add every address they use, but this is a bit of hassle...

This review is for a previous version of the add-on (0.2).