Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs that preserve your privacy. Cookies are separated by container, allowing you to use the web with multiple identities or accounts simultaneously.
Check if "Facebook Container” extension 1.4.0+ is installed. If installed, message Facebook Container asking for a list of domains that are “jailed”. Once received, remove any assignments for the domains on that list.
Also, grey out the checkbox to assign any of those "jailed" domains.
@jonathanKingston what about this part - "Also, grey out the checkbox to assign any of those "jailed" domains." We can do this in a separate issue, doesn't have to be in 7.0.0
Check if "Facebook Container” extension 1.4.0+ is installed. If installed, message Facebook Container asking for a list of domains that are “jailed”. Once received, remove any assignments for the domains on that list.
Also, grey out the checkbox to assign any of those "jailed" domains.
See also https://github.com/mozilla/contain-facebook/issues/113