Rated 4 out of 5 stars

Yep, same issue - displays the GMail webpage and have to manually enter the password.

Another recent annoyance (bug?) is that the mail snippets windows often appears at the mouse-location, rather than popping up at the appropriate location on the add-on bar.

This review is for a previous version of the add-on (0.7.1.1).  This user has other reviews of this add-on.