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old bookmarks

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I lost my bookmarks when I updated - I have a file on my desktop that is labeled old Firefox data. Nothing I can find explains how to get the old data file back into the new version. Some articles do talk about how to restore lost bookmarks but they all assume I can "see" the old files if I click on the restore tab in bookmarks. That will show me the Old Firefox Data folder, but when I open it none of the file folders appear to contain the HTML data needed.

I am 76 years old and not terribly computer literate. I need rudimentary explanations to solve my problem.

Failing that, can I just go back to my old version that worked?

Thanks,

I lost my bookmarks when I updated - I have a file on my desktop that is labeled old Firefox data. Nothing I can find explains how to get the old data file back into the new version. Some articles do talk about how to restore lost bookmarks but they all assume I can "see" the old files if I click on the restore tab in bookmarks. That will show me the Old Firefox Data folder, but when I open it none of the file folders appear to contain the HTML data needed. I am 76 years old and not terribly computer literate. I need rudimentary explanations to solve my problem. Failing that, can I just go back to my old version that worked? Thanks,

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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)