Excellent for Work vs Personal Use. History stays all together, but cookies, authorizations, and 2FA use is separated among containers.

Ie. using say, MailChimp in a Work Container with 2Factor - once logged in, that container alone keeps those cookies, so if you attempt to access it via the incorrect (or alternative) container, you must go through 2FA again. This alone tells me nearly everything has been thought of.

Can also separately use multiple Google Accounts, and the Google Data (history, location, preferences, etc.), are kept within each respective container.

I'd go on, but you get the idea. Takes a bit of customization and a short learning curve to get used to, but a highly useful extension if you toggle between Work & Personal accounts, or just have varying needs and multiple logins.

Dramatically reduces memory! (Rather than having say, Firefox & Private Mode open - thus, 2 browsers, doubled extensions, etc.), all of this takes place natively within 1 browser.

Love it!!