Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

How do I get my 32-bit FF session loaded into 64-bit FF?

  • 1 freagra
  • 0 leis an bhfadhb seo
  • 6 views
  • Freagra is déanaí ó cor-el

more options

I have just installed 64-bit FF. I can see that tabs have synched, but not previous 32-bit session. How can I migrate that session?

I have just installed 64-bit FF. I can see that tabs have synched, but not previous 32-bit session. How can I migrate that session?

All Replies (1)

more options

You can copy sessionstore.jsonlz4 from the 32-bit profile to the 64-bit profile, but if both versions are the same and are from the Mozilla server and not from the Microsoft store, then there is nothing against using the 32-bit profile with the 64-bit version provided that you no longer intent to use the 32-bit version and have uninstalled it. You can remove compatibility.ini in a profile to make this possible and use the Profile Manager to select this profile.

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).


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 (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)