Sign in to gmail multiple accounts at once

Follow the steps ===>
1#  Login in to your gmail.accout.
2#  Click on top right your profile or name is their.
3#  Click on button ‘Add account’

4# On the page that opens, enter the email address and password for another account you wish to access, and click Sign in.

After you sing using multiple account at a time, and easy to jump from one account to another, like this belo image, lets enjoy.