Firefox's "Logins and Passwords"?
How can I import password from a csv file to Firefox's "Logins and Passwords"?
See the note at the bottom of this article about how to enable CSV import via the about:config page.
If there are problems with importing the CSV file then create a sample file via "Export Logins" and compare the format of your CSV file. If necessary use "Create New Login" in Lockwise to have at least one login.