[logic]

This has happened to me several times as well. I use them with the temporary container tabs add-on (so, short-lived containers by default, plus a selection of specific sites that I retain information for, with strict cross-domain isolation), and let me tell you, losing that configuration is painful after setting it up.

The fact that you can't sync container configuration between devices is also a huge pain point, when you have a nontrivial setup.

I still use them, but I accept that I'm going to endure some pain now and then; I can't recommend Firefox containers to people who just want to get work done right now.