Mixed feelings Rated 3 out of 5 stars
I have been using this add-on for a very long time and have always loved it's simplicity. Just a tiny icon, showing how many new messages there, and when you click on it, you can see the subjects of the new messages for each of your gmail accounts. Couldn't ask for more. I had the problem of occasionally not being able to login, but could always solve it.
If it works, then this is a great add-on