Ran into the same limitation. I had tried logging in to a local dev server and then running fuite, but it looks like it runs the tests in its own personal chromium instance so my session wasn't used.

There are no memory leaks on my login and sign up pages though!

edit: just checked the docs and it says you can specify a scenario script with a setup hook to get passed authentication.

I jump into this project implementation and it supports login page by using some config. You should give it a try