[craigmart]

What kind of protection does Facebook Container have other than deleting cookies outside of the container?

For my case Total Cookie Protection is enough, but if you want the same protection of Facebook Container for every website (i.e. session cookies which are deleted each time you restart the browser) you can install Cookie AutoDelete or use the built-in option to delete cookies at restart (whitelisting websites where you need permanent cookies).

[wisniewskit]

It also blocks network requests made by third-party sites to FB. So unless you're already running ETP with the content blocker on (strict mode, private browsing mode) or another ad blocker kind of addon that also blocks FB strictly, then that's an additional measure.