login names and passwords work on firefox but not in explorer

Hello, I am new here and was wondering if you could help with a problem. I have been using firefox and norton has been remembering my login names and passwords. I have recently switched to internet explorer because of some problems with firefox and now have to sign in and enter my password on sites that norton has previously done this for me.

My user names and passwords are still held in Norton in manage log ins so does anyone know how to make them work in explorer please.

Kind regards Doris