I had a look at the github issue, and what worked was this comment: https://github.com/mozilla/multi-account-containers/issues/822#issuecomment-452068677 https:

I had a look at the github issue, and what worked was this comment: https://github.com/mozilla/multi-account-containers/issues/822#issuecomment-452068677 https://github.com/mozilla/multi-account-containers/issues/8... You can try this if it affects you.