The least painful way of getting separate cookies/logins for the same sites and also being able to separate activity as a bonus. Does what you need for the most part.

The reason for it not being 5 stars is because it is lacking in features I think, the most important things for me would be fresh cookies or separated cookies by default or the option to start fresh for each container, it seems that when I create a container I am already logged in so I need to sign out of all of the ones I want to use on that site. The second thing would be to have a fast way to open many containers such as ctrl+click on each of them which would ideally keep the menu up while doing it if possible, otherwise another quick way to select them would do.