This is a great start. A few small changes would make a big difference. If there was a way to set one container as the default where all new tabs (unless specified otherwise) went into that container, that would be great. Most of my tabs are work, so it would be nice to have that be the default one.

Also, I'd like it to automatically reset a tab to a certain container like it does to facebook, just by what site I went to. For example, I'd like that same functionality for facebook to apply to Twitter, Pinterest, and other social media. If there was a way to integrate sites that are saved as bookmarks with containers, that might be a great way to do it.

Keep up the good work on privacy. You're the only group that seems to be doing it.