I really like the idea. So far I have only two problem using this add-on: when I open a new container-tab, it will take some time (an unacceptable period of time) before it's ready to work; and this add-on lacks of rich keyboard shortcuts which is something I quite depend on.

Good to have multiple account. Not so good to manage multiple tabs in groups.

Every time I close and open the browser, tabs are reset to some state that was a couple of months ago. It does not restore the tabs and containers that were open when I closed the browser.

This is an excellent plugin but it suffers from not enough administrative interfaces being exposed. To use this addon successfully I'd need an interface where I can manage the auto-open-in-container lists easily and quickly. I've also run into a few problems where auto-open hasn't kicked in, and I've clicked a link and been left wondering why I'm logged out/logged in as a different account. Cheers.