1- Get Firefox 5.0 2- Tools - Add-ons - Search for multifox plugin 3- Restart firefox 4- Login to your 1st gmail acount for example 5- Click on the name of your account that now apears in front of url 6- Select new account 7- Login to your 2nd google account. Now you have 2 accounts simultaneously opened on same browser, and you can open many more.