The only reason I'm giving 4 stars instead of 5 is because I'd like there to be a way to manage the site lists for my containers manually (i.e. by typing a site address into a text box & hitting "add to list") as opposed to having to navigate to that website & then use the "Always Open This Site in..." button to get it to show up in the list.

Other than that nitpick, I love this! I like being able to have at least some control over the information that trackers from any given site get, & it's been good for organizing tabs as well!