lexis68, if you are talking about recovering Sync data that has been deleted following a Firefox account password reset, then I am not sure that this is possible, unfortunately. See the answer in this thread: https://support.mozilla.org/en-US/questions/1379531#answer-1511399 But if someone else has more information then they can say here. However, if you have a local desktop Firefox profile that used to have the data, then it might be possible to recover some of it from files on your computer. Although this would need to be attempted as soon as possible, in order to avoid any remaining data being overwritten. Here are some instructions for hopefully restoring bookmarks and passwords. ---- You might be able to restore bookmarks from Firefox's own backups. See the "Restoring from backups" section here: https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them ---- Sometimes missing passwords can be retrieved using the logins-backup.json file in the Profile folder on the hard drive. 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 then restore the original two files. ---- If you are still missing either bookmarks or passwords after the above, then here's something else to try: https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update