Sure, see Import login and password data from a file.

^: See the note at the bottom of that article about how to enable CSV import via the about:config page.

If there are problems with importing then use "Create New Login" in Lockwise and export this file to get an example of the format of the file.

• https://support.mozilla.org/en-US/kb/password-manager-remember-delete-edit-logins
• https://support.mozilla.org/en-US/kb/export-login-data-firefox-lockwise

To TyDraniuK:

Thanks so much. It worked perfectly. I did have to go through the steps of getting "Import from a File" added to the drop-down menu.