Good, but not good enough... Rated 3 out of 5 stars

It does what it promises. But, I was looking for a full featured extension, so you can read your message in the same window, reply quickly without leaving, and even put it in trash without leaving your current page. Unfortunately, this extension is no longer being developed, so if you are looking for a simpler mail alert experience, this is for you.

This review is for a previous version of the add-on (0.6.4.1).