No way to configure "always open this site in" default container

[gentoo-root]

Before submitting a bug report

• [X] I updated to the latest version of Multi-Account Container and tested if I can reproduce the issue
• [X] I searched for existing reports to see if it hasn't already been reported

Step to reproduce

1. Click the extension icon.
2. Click "Always Open This Site in...".

Actual behavior

The list of containers is shown, but the default container (no container) is not in the list.

Expected behavior

I would expect "no container" to show up in the list to be able to force some sites to open in the default, non-containerized way, when I navigate there by a link from a containerized tab.

Use case: I use most of the sites outside of containers, log into accounts, etc., and when some link in a containerized tab leads me to some site where I have an account, I would like it to open in the "default" container (i.e. no container). However, right now it's only possible to make it open in another container.

Additional informations

No response

Provide a copy of Troubleshooting Information page (optional)

No response

[ColonelGerdauf]

I previously achieved this via IIRC a hack via about:config, but I have forgotten, and the Firefox setup got lost to time and data corruption.

[dannycolin]

Duplicate of #503