I do not understand. I reinstalled my Slimbook OS. After reboot, seems like the user account for linux is created after the reboot. But anyways, I signed in Firefox, got my extensions, passwords, and also my Multi-Account Containers saved containers. I upgraded system and rebooted and Slimbook OS created a new account. So, I had to login to Firefox again and do the same. But this time, got extensions, passwords but not the Containers. What the heck ?! What's wrong here ? I really would like my containers back. Someone please help me.