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Profile transfer

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  • Последний ответ от cor-el

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My old computer became incredibly slow and almost unusable. I managed to find my firefox profile folder using the %APPDATA% search and copy it to an external hard drive and connect it to my new computer. I wanted to keep my bookmarks, extensions, and logins, so I followed this:

https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile#w_copying-files-between-profile-folders

But nothing changed on Firefox on the new computer. Going back to my old PC will be incredibly tedious, so I am hoping having moved my old profile folder to my new PC I have done everything I need to. Any help would be appreciated.

PS I am at work and don't have immediate access to my computer.

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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. Note that you should be cautious with copying SQLite database files if you previously had problems.


  • 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 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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