If you’re tired of signing in and out, or opening up new browsers in order to check all of your Gmail accounts at the same time, try Gmail’s multiple sign-in. With multiple sign-in, you’re able to access different Gmail accounts (up to 10) in tabs in the same browser. Multiple sign-in is automatically enabled for all Gmail and Google Accounts.
If you use multiple sign-in, the first account you sign into will be your default account until you close your browser. I
Here’s how you sign in to multiple Gmail accounts in the same browser.
Sign in to your Gmail account
Click your email address at the top of the page.
Select Add account from the drop-down menu.
It’s that easy. Try it. No longer will you have to open multiple browsers to check your Gmail accounts or other Google products.