Look on your Desktop for a Folder called Old Firefox Data Find your Profile and see if you have 2, your looking for the oldest dated one. If so it might be possible. *bookmarks and history: places.sqlite *bookmark backups: compressed .jsonlz4 JSON backups in the bookmarkbackups folder fyi for the future : *https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer *https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles Let us know if need further help.

It is possible that profiles.ini got corrupted or removed. *https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible You can check if you have an orphaned profile that isn't registered in profiles.ini and that doesn't show in the Firefox Profile Manager. You can check that by opening the current profile folder via the <b>about:profiles</b> page and go up one level (..) to see if there are unlisted profiles present. If you have found an orphaned profile then you may want to recover some personal data or restore his profile. *https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile See also "Profile was moved or renamed": *https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible Note that you should never use "Choose Folder" to specify a folder that already contains files that do not belong to Firefox. Only use "Choose Folder" to recover an profile that isn't listed in the Profile Manager. *https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles