Locked out after installation

I’m awfully sorry for this noob question… I installed homeassistant on a cloud hosted vserver and everything runs great incl. connection of security cams etc.
However, once I rebootet my notebok and my browser’s cookies were reset I got logged out and now cannot login anymore. I guess I have a password (stored by firefox automatically), but no username. I cannot remember setting one up, is there a default user name?
I do have access via SSH to the machine, is there a way to get that information from some file?
I don’t have the CLI installed.

thanks a lot!