if you are using Hotmail and Seamonkey, why not use the built-in mail client instead of the web interface?
Hotmail supports POP3 and SMTP protocol.
POP3, server name: pop3.live.com, SSL
SMTP, server name: smtp.live.com, STARTTLS
user name: your hotmail address (including "@hotmail dot com")
A mail client is much more convenient than a web interface. And there is no annoying ads