A great addition, it allows me to use the same browser for different clients; it's really made my life much easier when working. One addition I'd like to see is greater control over which container a page starts in, instead of just setting a domain name to always open in one container it'd be nice to be able to also provide subdomains/url matchers eg. slack.com/123 would open in one container but slack.com/456 would open in another