The passwords are stored in the following locations on Unix/Linux:
The directory is usually inside your home like this:
~/.mozilla/firefox
logins.json contains the locations, username and password
key*.db (usually then name could be key3.db or key4.db)
Without the key file you will not see any passwords in Firefox as it is required to in order to decrypt the contents of logins.json........
The location of the hash is stored in the configuration.php file and is really a bit of pain to have to pull out everytime but this is how WHMCS stores its encryption key hash to see the full credit card number.........