If I open a second window or tab I expect when I go to 'myemail.com' that it knows who I am and shows me my account even though the url in the 2nd tab doesn't h

If I open a second window or tab I expect when I go to 'myemail.com' that it knows who I am and shows me my account even though the url in the 2nd tab doesn't have any extra info in the URL