Someone used their yahoo account at a computer lab. She made sure her yahoo account was no longer open in the browser window before leaving the lab. Someone came in behind her and used the same browser to re-access her account. They started sending emails from it and caused all sorts of mayhem.
Question: What do you think might be going on here?
The first person probably didn’t log out of her account, so the new person could just go to history and access her account.
Another possibility is that she did log out, but didn’t clear her web cache. (This is done through the browser menu to clear pages that the browser has saved for future use.)