Restoring you Firefox Profile from Backup

Copy the backup directory (named .mozilla) to /home/<user>/ and set the permissions so that Firefox can read and write to the files:

chmod -v -R u+rwx,g+r /home/<user>/.mozilla

Explination:

-v for verbose (nice and matrix like)

-R for recursive (applies changes to all files and folders in the mozilla directory

u+rwx means: user (u) add (+) permissions read (r) write (w) and execute (x).

g+rw means: group (g) add (+) read (r).