If you have only removed the Firefox installation folder then your profile folder might still be there. If you reinstall Firefox then Firefox should use this profile automatically. See also: *https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update Note that you need a copy of places.sqlite that has this history to restore/access the deleted history. *https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile