Close all tabs, apps and extensions.
Click in the Options section (right bottom corner of the home screen by the clock).
Click on the power button.
Choose ‘Sign out’.
On the login screen, click the down arrow by your name and choose ‘Remove account’.
Click ‘Remove account’ a second time.
Click ‘Shut Down’ in the lower left corner.
Click ‘Shut Down’ a second time.
Wait 30 seconds until you try to log-in again.