non-containment (prevention, for some addresses or types of address)

Might this become an option?

Please compare with:

• “Open always in no container” setting · Issue #503 · mozilla/multi-account-containers

– with (from me):

… I imagine that in a majority of cases, it will be sane to enforce non-containment of about: … URLs.

[kintesh]

Alternatively, you could have strict container mapping where vising a site (not mapped to any container) from a container should open that site without any container.

[kintesh]

For the next itteration I am planning to have better ui with dropdown options to pick container. I guees No container could be an option to pick. I also want to an option to export/import json based configuration.