https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them https://support.mozilla.org/en-US/questions/966133

You need to enable import CSV in the Password Manager (about:logins) via the <b>about:config</b> page as this menu item is currently hidden for performance reasons. *about:config => signon.management.page.fileImport.enabled = true *https://support.mozilla.org/en-US/kb/about-config-editor-firefox Login CSV import is currently broken in Firefox. The CSV import bug is fixed in Firefox 108, so in 104-107 you still need a workaround to flip s pref temporarily. See: *[/questions/1391603] importing passwords firefox 105.0.1 If you have access to a device/profile/backup that has all logins then you can possibly copy logins.json and key4.db from this device to your current profile folder. This will replace all current logins, so if necessary create a CSV backup. *https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile