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Transferring tabs to Firefox on a new PC

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I am replacing an old laptop and want to transfer all my Firefox settings to the new one. I have gone into the Sync setting on both and checked all Sync options - including Open Tabs. However, when I select Sync Now on the new PC, my open tabs from the old PC are not set up. I noticed that there is a Synced Tab sidebar which invites me to Connect Another Device - but selecting that option just leads to an invitation to login on an IOS or Android device. But, I don't want the tabs from there - I want it from my old PC. I realaise I could simply recreate the tabs - but with a hundred or so active, this would be a very tedious exercise. What can I do please?

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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.

  • 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 (passwords) and key4.db (58+) (decryption key) for Passwords saved in the Password Manager
    support for key3.db ended with Firefox 73
  • cert9.db (58+) 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 website specific data (Site Preferences)
  • sessionstore.jsonlz4 for open tabs and pinned tabs (see also the sessionstore-backups folder)

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:profiles page.

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