There are a similar thread and support article which may help. https://support.mozilla.org/en-US/questions/1315684 https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data#w_what-information-is-stored-in-my-profile There is also a file named logins-backup.json which you can copy as logins.json if need be. You should close Firefox before copying files or folders.

This is the official support for the Mozilla Firefox web browser. Anything else, including phones, is not associated with Mozilla. Especially if they want payment.