It's definitely a frustrating experience to have to re-assign all of your containers if you happen to reinstall the browser. This should be easily supported by Firefox Sync.
Or if you happen to run Firefox between multiple devices. It's been a pain maintaining a couple of instances' synced when it comes to containers (again, such a shame).
There's an open issue [1], but no resolution yet as it seems.
There's an open issue [1], but no resolution yet as it seems.
[1] https://github.com/mozilla/multi-account-containers/issues/3...