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. *https://support.mozilla.org/en-US/kb/reset-your-primary-password-if-youve-forgotten-it *https://support.mozilla.org/en-US/kb/use-primary-password-protect-stored-logins 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 <b>about:profiles</b> page (Root directory). *Help -> More Troubleshooting Information -> Profile Folder/Directory:<br>Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder *https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data