Multi-Account Container interferes with Facebook Container

[dannycolin]

• Facebook Container Version: N/A
• Operating System + Version: Intel Mac OS X 10.15
• Firefox Version: Firefox/100.0
• Other installed Add-ons + Version + Enabled/Disabled-Status: N/A

Actual behavior

when visiting bugzilla.mozilla.org, the "Personal" Tab suddenly changes to a normal (Non container, non "Personal") Tab.

It is not possible to open any *.mozilla.org site in a container tab because, after visiting the mozilla.org url the "container tab" changes its type to a "normal tab"

When you remove the domain mozilla.org from facebook containers "allow list" by clicking on "Remove Site from Facebook Container" then the multiaccount container extension works again normal

Expected behavior

the "Personal" container tab should remain "Personal" regardless of the opened url. The extension Multiaccount Container should not use information from the Facebook Container Extension.

Steps to reproduce

1. install the extenion facebook container (V2.3.2) https://addons.mozilla.org/en-US/firefox/addon/facebook-container/
2. install the extension Firefox Multi-Account Containers (V8.0.6) https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/
3. open a new Tab (CMD+T) and go to https://www.mozilla.org/
4. click on the facebook container icon on the toolbar and click "Allow Site in Facebook Container", then click "Allow"
5. click on the icon Multiaccount Container icon and open a new "Personal" container Tab
   in the "Personal" Tab, visit https://bugzilla.mozilla.org/

Notes

Moved from https://bugzilla.mozilla.org/show_bug.cgi?id=1763820