Now here comes the good news for users who have more then one gmail account,because now you would be able to sign in to multiple accounts from the same browser and will get rid of playing with multiple browsers
Now Google has started the Multiple Account Sign in service for all
If you've registered more than one Gmail username,you can use the multiple sign-in feature to use two accounts at once.
So you have to sign in to first account and go to settings at the top right
then click on Accounts and Import tab and at the bottom click on Google Account settings
Or simply visit this link and sign in to your google account
Here under personal settings you will see Multiple sign-in feature click on edit to turn it on
When multiple sign-in is turned on, you can click the arrow next to your address (at top right) to switch between accounts with these Google products: