Firefox has the option of using a "master password" to protect all your saved passwords. When a master password is enabled, your saved passwords are encrypted and can not be accessed without entering the master password. See Use a Master Password to protect stored logins and passwords for more information. How does my master password work with Sync? When using Sync, your Firefox Accounts login is stored with your saved passwords in the Lockwise password manager. Your master password must be entered so Sync can access your Firefox Accounts login. Once the master password has been entered, Sync can also access your other saved passwords and sync them between your devices. Passwords will not sync with Firefox for Android if a Master Password is enabled there. https://support.mozilla.org/en-US/kb/using-master-password-sync