Good add-on, but... Rated 4 out of 5 stars
Very good add-on, but it's very annoying having to enter the accounts passwords several times everyday !!...This review is for a previous version of the add-on (2.6.1).
Rated 5 out of 5 stars
But I had a problem with it :
Since I have changed my passwords on my 2 accounts, Gmail checker often can't connect to one or the other.
I had to uninstall yje add-on and suppress gmailchecker.sqlite, and then to reinstall the add-on. And now it works fine!