Just as everyone else said, Google Chrome has a built in auto fill feature.
But you may also considder using 10 minute mail, its a website which instantly gives you a temporary email accounts which only lasts 10 minutes.
You basicly go to the site, and they say "this is your email ******@10minutemail.com" and you put it in the registration and then instantly confirm it on their website.
no hassle with logging in to your hotmail and what not, and no spamm either.