I too lost my multi-containers and assignments. I was just reading this (2017) discussion: https://github.com/mozilla/multi-account-containers/issues/3...
and noticed mention of file 'containers.json', which I found in my current Firefox profile. It contains the descriptions of the containers I created since yesterday (for the 3rd time).
So it looks as though a manual backup of that (or the whole profile, knowing its in there) at least will end that chore.
But you still lose the Container -> websites associations. The same page recommends: "An effective way of exporting and importing containers safely is using ffcontainers."
So it looks as though a manual backup of that (or the whole profile, knowing its in there) at least will end that chore.
But you still lose the Container -> websites associations. The same page recommends: "An effective way of exporting and importing containers safely is using ffcontainers."
The page for that syncer is here: https://github.com/pierlauro/ffcontainers ... but it's on hiatus at this moment.