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How to transfer Firefox bookmarks and passwords to a new computer

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How does one migrate Firefox bookmarks and passwords from an old computer to a new computer?

There are four computers involved in this shuffle. Two new, one being retired, and one being repurposed. The only thing we haven't been able to figure out, is how to migrate Firefox's information from one computer to another one.

And, we've been working on this since Christmas. Edge, Brave, and Chrome took minutes. Combined.

But, transferring the information on Firefox has been impossible. Yes, I've read the help topics. No, they were not helpful. Firefox will not accept either the backup or export files from the old Firefox across multiple computers.

Yes, I have Sync. And, no, that hasn't worked either.

So, what is the next step?

How does one migrate Firefox bookmarks and passwords from an old computer to a new computer? There are four computers involved in this shuffle. Two new, one being retired, and one being repurposed. The only thing we haven't been able to figure out, is how to migrate Firefox's information from one computer to another one. And, we've been working on this since Christmas. Edge, Brave, and Chrome took minutes. Combined. But, transferring the information on Firefox has been impossible. Yes, I've read the help topics. No, they were not helpful. Firefox will not accept either the backup or export files from the old Firefox across multiple computers. Yes, I have Sync. And, no, that hasn't worked either. So, what is the next step?

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You can copy certain files with Firefox closed to the current profile folder to transfer or recover personal data. Note that best is to avoid copying a full profile folder.

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 about:profiles page (Root directory).


  • bookmarks and history: places.sqlite
  • favicons: favicons.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 (encrypted logins;32+) and key4.db (decryption key;58+) for Passwords saved in the Password Manager
    key3.db support ended in 73+; to use key3.db in 58-72, make sure to remove key4.db
  • cert9.db (58+) for (intermediate) certificates stored in the Certificate Manager
  • persdict.dat for words added to the spell 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)

You can also consider to use Sync to merge data from all connected devices as copying files replaces current data. For merging bookmarks you can use an HTML backup.

For mergin logins you can use a CSV backup.

You need to enable import CSV in the Password Manager (about:logins) via the about:config page as this menu item is currently hidden for performance reasons.