Rated 4 out of 5 stars
This add-on is great but since the new gmail theme it has a lot of problems especially with lab apps such as the one which display the chat on the right side instead of bottom down.
I don't know why, but it doesn't refresh well most of the time, unfortunately i have to deactivate it :(
Sorry about the lab issues!
We will look into it and see what we can do!