Originally Posted by
CodeAdam10
Create a password-protected file, save it on a flash-drive, password protect the flash-drive. The file can contain passwords in code...let's say for BA...you can write BriAdios...naturally you know what the heck that means, but others probably won't. That's one suggestion. I guess you can do the same with a diary.

Or have sharp memory like me and hope you will remember them all forever

As long as in the end you can remember the password for the graveyard you are good to go (literally).
Seriously though, OP is right to use different passwords for their FF accounts and try to avoid common usernames - use FF numbers instead as they are all different.