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lost master password

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Lost master password so cannot reset to new one

Lost master password so cannot reset to new one

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You can possibly rename/remove logins.json and key4.db in the Firefox profile folder to reset the Primary Password and remove the logins stored in the Password Manager.

You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).