Sign in with Suomi.fi (strong authentication at tunnistus.e-kirjasto.fi).
Run it on your own computer instead: your sign-in and files stay there.
The access_token cookie of
web.e-kirjasto.fi after you signed in there (browser dev tools,
Application, Cookies), or the token tunnistus gave the app. It is exchanged for a fresh one and kept only in your
session on this server.