Rated 3 out of 5 stars

The add-on works well.
If you do some more work on it, please include the following:
- don't give Size info on accountnames
- Size info on newsgroups gives "???", just leave it out

Let's hope they put it back in in the bug https://bugzilla.mozilla.org/show_bug.cgi?id=464973

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