0 Gmail Sign In [Multiple Accounts]

Gmail is getting more and more popular as one of the better webmail provider and it users the Google accounts login. To sign in or login to Gmail, you can visit, http://mail.google.com, but if you own multiple Google Accounts, then when you switch between Google Services, you need to login and log out. With a simple Greasemonkey script you can easily switch Google accounts, without having to login and logout each time. Once you have installed the Greasemonkey add-on for Firefox, install the user script.
Next time when you login to Gmail or any Google account, you can see a drop down on the extreme right where you can add new accounts. When you want to switch account, select the account from the drop down list and this script will automatically switch accounts without having to login and log out.