This addon is absolutely amazing and I use it every day to keep services separate like google and Twitter to prevent tracking. However, there are two things I wish it would do.
I frequently use more than one computer, often more than 3 a day and this plugin is missing a very important feature; Firefox account sync.
Secondly I find myself really wishing I could manually enter rules for what websites open in what containers, it is a bit tedious to do so right now.
