I have modified the password of my Stack Overflow account. I am able to login without entering new password on the computer where old password is saved.
How I can force to enter new password to connect to website ?
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When you log out it will log you out everywhere
Mouse over your display name at the top, and choose "log out"
Click the "log out" button, which will:
clear all local credentials in your browser, and log you out on all devices.