I'm sure there is an easier way, but if it a FTP connection (not FTPS), you can see the password using a tool like fiddler or wireshark. I just tested with wireshark and it worked fine. If your connection is FTPS, you can try and change it to FTP and see if it sends the password in clear text. I'm not sure about the last one, as the connection will probably fail (due to wrong protocol), but you can try. I'm sure Henrik & co have a better solution
Thomas