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If someone put his hands on the files where my passwords are saved (key3.db and logins.json files), can he know what my passwords are?

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If someone put his hands on the files where my passwords are saved (key3.db and logins.json files), can he know what my passwords are?

If someone put his hands on the files where my passwords are saved (key3.db and logins.json files), can he know what my passwords are?

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I guess so. Therefore it's recommended to encrypt the passwords you tell Firefox to remember. This is done by setting a master password. Firefox will then prompt you for the master password when it needs access to a stored account password.