Click on the ‘hamburger’ icon located at the upper right corner of your browser.
From the pop menu that opens, choose Settings
Scroll down to the button and click the option titled Show advance settings.
Under the heading Privacy, select the option titled Content settings.
Once a new window for Content Settings opens, checkmark the option titled ‘keep local data only until you quit your browser’ and then click Done.
Close the settings tab and you are done.
Note: If you are unable to locate any of these options or they appear differently, upgrade your browser to the latest one.
Read more about other browsers from here: https://www.purevpn.com/blog/how-to-delete-cookies-at-browser-exit/