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new computer, want to add "old firefox data" that was saved to new mozilla firefox

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  • Last reply by cor-el

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I got a new laptop. The tech transferred all old files to my new computer. I have a copy of "old firefox data". how can i restore that to my new copy of firefox?

I got a new laptop. The tech transferred all old files to my new computer. I have a copy of "old firefox data". how can i restore that to my new copy of firefox?

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When were the files put in the Old Firefox folder? You would be better off copying the current profile to a thumb drive. Then Copy them to your new profile.

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See also:

You can use this button to go to the current Firefox profile folder:


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

  • bookmarks and history: places.sqlite
  • bookmark backups: JSON backups in the bookmarkbackups folder
  • SQLite files like cookies.sqlite (cookies) and formhistory.sqlite (saved form data)
  • logins.json and key3.db (decryption key) for Passwords saved in the Password Manager
  • cert8.db and possibly cert_override.txt for (intermediate) certificates stored in the Certificate Manager
  • persdict.dat for words you added to the spelling checker dictionary
  • permissions.sqlite for Permissions and possibly content-prefs.sqlite for other Site Preferences
  • sessionstore.js for open tabs and pinned tabs and tab groups