There isn't a "print option" to do what your asking just with printing.

Export it and open it in Excel. That's all you need to do.

Hello,

To export passwords and then print them,

about:logins in Firefox address bar, then Enter

You click on the three horizontal dots at right.

Export Passwords...

When you export, your passwords are saved to a file with readable text. When you’re done using the file, we recommend deleting it so others who use this device can’t see your passwords.

You'll get a .csv file that you can open with a spreadsheet program (LibreOffice calc, Excel, Numbers, etc.) to delete the columns you don't want and keep, for example : url username password