This is one of the best scripts for those who maintain multiple accounts. It's a boon for Guys like me who need to take care of their personal and official accounts simultaneously.This script saves a user cookie so that you just click on the email address and log in to in without any restriction.You can add as many profiles as you can, you just need to log into each one time after you install this script

This is an replica of this script http://userscripts.org/scripts/show/10592 - in case someone is there to object why i have replicated , feel free to leave a comment.I'll be obliged to reply to your queries

PS: All Credits - Mr Nobody (the translator)