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lost all my logins

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I switched to windows 10 and downloaded Firefox to find none of my data is coming back/sync. I have lost all my logins especially, is this a error or is there something that can be done? thanks.

Tất cả các câu trả lời (1)

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Sync isn't designed to be used as a backup, so it isn't guaranteed that you can can personal data back.

You can check if you have an "C:\Windows.old" folder with your previous Firefox profile folder.

You can copy files like these with Firefox closed to the current profile folder to recover specific data.

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


  • bookmarks and history: places.sqlite
  • bookmark backups: compressed .jsonlz4 JSON backups in the bookmarkbackups folder
  • cookies.sqlite for the Cookies
  • formhistory.sqlite for saved autocomplete Form Data
  • logins.json (passwords) and key4.db (58+) or key3.db (57 and older) (decryption key) for Passwords saved in the Password Manager
    if you only have key3.db then make sure to remove an existing key4.db
  • cert9.db (58+) or cert8.db (57 and older) for (intermediate) certificates stored in the Certificate Manager
    if you only have cert8.db then make sure to remove an existing cert9.db
  • persdict.dat for words you added to the spelling checker dictionary
  • permissions.sqlite for Permissions and possibly content-prefs.sqlite for other website specific data (Site Preferences)
  • sessionstore.jsonlz4 for open tabs and pinned tabs (see also the sessionstore-backups folder)