Review for Gmail Manager by george kendros
Rated 3 out of 5 stars
The app does half of what it promises. It allows me to open a different gmail account in each tab.
The problem is that the notification poortion of the app doesn't work properly (it would only sign in to one of my 3 accounts). If the notifications worked I'd give this a 5.
To create your own collections, you must have a Mozilla Add-ons account.