Was just coming back to this thread to say I use the Multi-Account Containers extension to isolate my Facebook, YouTube, Twitter, and Google Search sessions from the rest of my web browsing, and I highly recommend it.

The terminology is a little confusing: Containers or "Container Tabs" is a session-management tool that's baked into Firefox, while Multi-Account Containers is an extension on top of that that allows you to automatically sort specific domains into containers, so when I open e.g. a YouTube link it automatically appears in a YouTube container, which knows nothing about my Google account. IMO the functionality of the extension (which was written by Mozilla) should be added to the browser itself.

https://addons.mozilla.org/en-GB/firefox/addon/multi-account...

Does this work for separating Google accounts?

Right now I use safari, chrome, firefox, and edge to keep the four identities I use for different projects separate thanks to Google not playing nice at all with the GCP account you are using not being the primary Google Signin.

Yes, it does

Multi-container will break any SSO experience that depends on cookies, where the sso domain (abc.sso.com) is not pinned to a container, and the destination domain (abc.com) is pinned to a container, due to the correct behavior of not allowing cookies to be copied into the container when the SSO chain of requests traverses from abc.sso.com -> abc.com.

This plus the inherent back button hijacking when you click a link that throws you into another container (which works by opening the link in the new container tab, changing to it, and closing the original tab), led me to just stick with facebook containers and sacrifice the privacy offered by multi account containers for some convenience.

Sync for multi-account-containers was implemented in Feb 2020, nice! And it works on mobiles as well! Reinstalling.

> Love to see the Facebook container mark also on other websites trying to track me.

In fairness, some of those sites might not even know the like button is used for tracking and just think it's for helping them grow their facebook audience.