great idea.
will be great if you can configure the containers and add and edit patterns for sites automatically open in the groups (general configuration for containers)

another improvement will be to add a private container.
open some files in this container and clear after close.

Great, how about subdomain attachment? We have site d3.ru, which have undefined subdomains, as gif.d3.ru, mascotte.d3.ru. Each of it - standalone feed with global authorization. Now I add each of it to container. Need assignment editor and wildcard support!

Great concept, and works perfectly. Only feature I would like to see added is the ability to prevent non-whitelisted websites from opening in certain containers (e.g. to add protection for the Banking container), similar to the way Facebook Container does.

Feature Request: Have an option to clear cached data, cookies etc under each container, rather than having to remove a container and add a new one. Would be very useful :) - Great plugin otherwise

Update: This was done and it is absolutely amazing now!

Extremely useful and amazing. This is a game-changer for online tracking! The next step up would be to sync the containers between different computers with same login.