Help with facebook session?

[Nedim]

Okay so, my friend logged onto her facebook using my mobile phone with a browser that I don't usually use. A couple of days later she says that she forgot her pass, and she doesn't know the email password because someone else created it bla bla bla.
Anyway after a bit of thinking we remember that she logged using my phone so we open the browser and she's logged in.
Now is there any way to find out the password now?
I mean we have an active session.

Thanks in advance!