Do you mean import the logins stored in Bitwarden in Firefox ? Firefox only supports import and export logins as a CSV file, so if you have a JSON file then you need to convert this file to CSV to be able to import the logins in the Firefox Lockwise Password Manager. You can do a Google search to find a website that offers to convert JSON to CSV. *https://www.convertcsv.com/json-to-csv.htm See the note at the bottom of this article about how to enable import CSV in Lockwise via the <b>about:config</b> page. *https://support.mozilla.org/en-US/kb/import-login-data-file *about:config => signon.management.page.fileImport.enabled = true *https://support.mozilla.org/en-US/kb/export-login-data-firefox-lockwise