very useful

Love this! So much faster than opening incognito windows!

Beats using two browsers 5/5. Feedback
Remove "open new tab in as it wastes time"
Add reopen this tab in icon to each container. This will save the time of users having to click twice. Additionally, the icon in the address bar should not be the always open, but rather open site in a container. That way I can open youtube in the other container in less than 3 clicks.

Serviceable, but could use enhanced features to help manage and prevent unwanted cookie-cross pollination into containers. An automatic default container would be nice for any website not in the whitelist.

EDIT: Adding an extra star to this as I realized toggling "limit to designated sites" for each container forces non-whitelisted sites into the default container, preventing unwanted sites from contaminating my custom ones.