Here is my use case.

* Work/Personal * Multiple AWS Accounts * Bank * Facebook (https://www.mozilla.org/en-US/firefox/facebookcontainer/) * Shopping * temp (test, disposable )

The only time I use private windows is when there is a glitch.

Use a different Firefox profile for work/personal.

Sign-in to personal (while at work) to sync bookmarks if firewall allows. Depending on whether you trust your employer you could sync further personal settings.

Don't sign-in to work profile and no work bookmarks or settings/logins get shared.

Don't get me wrong: multi-account containers are a blessing for those rare days when you absolutely have to log-in to facebook.

What are the differences between a profile and an account?

I suspect the mapping between accounts and profiles is 1:1, but you can have a different profile which is not associated with an account.

I think the reason why it is so well integrated is that it used to be part of the standard installation of firefox and only later moved into an addon.

Containers actually still are integrated in the standard installation of Firefox and can be used even without an addon. You just need to turn them on in about:config:

privacy.userContext.enabled to true

privacy.userContext.ui.enabled to true

privacy.userContext.longPressBehavior to 2

I love using containers with privacy.firstparty.isolate set to true too for extra protection.

https://support.mozilla.org/en-US/kb/containers

This add-on is a GUI to the underlying mechanism. They even say you can choose to use the non-GUI lower level hooks. They think this GUI is a nicer user experience

Thanks a lot for this.

I never understand why Mozilla doesn't allow to enable this in the settings.