I was working at client site and their web based authentication for Wireless keep expiring every 10 minutes. It was such a pain to login every single time. I tried a Java program but didn't go that well with unknown issuer X509 certificate.
I found GreeseMonkey pretty helpful, just a few lines of javascript code and you can ask Firefox to do whatever you want. I just wrote a few line of script to get page, put username/passwords and submit every few minutes, and never login again..
Also found ready made script for Outlook Webmail Autologin, saved tons of my keystrokes and refresh.
