You should've did a Firefox FAQ and there are links on how to backup and migrate the data to new install. So you need to get the old drive working and migrate the data over. https://support.mozilla.org/en-US/products/firefox/download-and-install/copy-info-to-another-browser https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles https://support.mozilla.org/en-US/questions/1317249 https://support.mozilla.org/en-US/products/firefox/download-and-install Firefox account is mostly used for sync between devices but if there was no sync at this point it won't work.