> delete cookies on exit

Containers are similar to browser profiles, except that history, bookmarks, HSTS, saved passwords, and everything else apart from cookies and other persistent data are "containerlized".

There are addons that introduce the concept of "temporary containers", that delete all cookies when you quit that container.

Google Container makes sure that every connection to Google domains (including YouTube) use a Google-specific container. This is the case for recaptcha and other probes Google has.

You only log in to google in one container. You use that container only for google. In every other container, you're not logged in.

I'm not sure why you'd need sync. The whole point is to isolate every website.

Originally it wouldn't sync across your signed in Firefox Accounts, the plugin would come across but not your saved containers/open with options. I feel like they might have added having your container settings being synced more recently though.

>The reviews for this addon are scary

This just verifies my expectation that reviews giving the lowest score tend to be stupid.

Be nice if there was a Firefox "No Pocket / No Hello / No Kitchen Sync / Just-a-Web-Browser-Without-Any-Bundled-Crap Edition".