Reset the master password of mozilla firefox

f you have lost or forgotten your master password or you want to disable the feature, you can reset the master password. Resetting the master password will remove all stored password information. Upon resetting, you will lose all the stored information in the Password Manager, as this is a built-in security feature to prevent people from simply resetting your Master Password to gain access to your passwords.

For Firefox, you can also look at the Troubleshooting section of the Password Manager article.

* Firefox: Enter chrome://pippki/content/resetpassword.xul into the Location    Bar (address bar), press the “Enter” key and click “Reset”.
* Thunderbird 1.5: “Tools -> Options -> Advanced -> Saved Passwords -> Master Password -> Reset Password”.
* Thunderbird 2 and above: Choose Tools – Error Console, paste the expression: openDialog(“chrome://pippki/content/resetpassword.xul”) and press the Evaluate button. That will open a dialog asking you if you want to reset your password.
* Mozilla Suite/SeaMonkey: “Edit -> Preferences -> Privacy & Security -> Master Passwords -> Reset Password”.

Note: Upon initial installation, Firefox sometimes believes it has a master password in effect and the user is unable to change or remove it because the set master password is unknown to the user [2]. This situation sometimes occurs when a Mozilla Suite/SeaMonkey profile’s passwords are imported into Firefox at install time. If this happens, reset the master password as explained above.

If resetting the Master Password via the chrome url didn’t work then you need to remove the files that store the encryption key (key3.db) and the saved names and passwords (signons.sqlite and possible leftover files signons.txt from previous Firefox versions).
See Password_Manager Troubleshooting

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