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There is also a Facebook-specific container addon that limits Facebook's footprint even more than the standard container addon (and will work alongside it)

https://addons.mozilla.org/en-US/firefox/addon/facebook-cont...

Also with the standard container addon you can specify that sites always open only in your specified container, so you could just set Facebook to always open in its own container that way.

Thanks this is great!

Great... But people still using Facebook?

There is an option called "always open in this container" if you press the menu icon of the container tabs extension

Ah great! I guess this was added more recently, I hadn't seen it before.

Turns out this doesn't do the thing I'd expect. I set my homepage to Facebook and it doesn't load the container.

Eh, back to my former opinion - Containers are great, Containers UX needs work.

I'm using Containerise to do that:

https://addons.mozilla.org/en-US/firefox/addon/containerise/

Configure Facebook to always use it's own container