I accidentally updated a password to that doesnt work to a website.

You'd better try harder to remember your password. Perhaps you can reset it?

Joseph, sometimes missing or previous passwords can be retrieved using the logins-backup.json file in the Profile folder on the hard drive. Although this particular recovery method would need to be attempted as soon as possible, as the backup file might later get overwritten. If you do not know where your Profile folder is, see here: https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data To attempt password recovery: # open your Profile folder on the hard drive # fully exit Firefox if it is running # move logins.json to a backup folder # copy logins-backup.json to a backup folder # in the profile folder, rename logins-backup.json to logins.json # restart Firefox If this doesn't work then you can always exit Firefox and restore the original two files.