Containerized tabs as essential?

[lifeismeta]

I don't seem to be able to make tabs essential once they've been moved to containers. I use Multi Account Containers for this, no idea if different plugins does things differently. Is this something that would be possible to add support for in the future, or is there some technical limitation surrounding containers and essentials?

[nasserd]

Your separate extension (Multi-Account Containers) may be conflicting with the Containers mechanisms now built-into Firefox and Zen.

For myself, I have several Essentials each with distinct containers defined -- and this execution is repeated in different (work)Spaces.

Best advice? Disable/remove the MAC extension. IIRC it has since been abandoned anyway due to its core functionality having been integrated into core Firefox.