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When I close/exit a webpage, email, facebook I always log out or sign out. But when opening a new page, I see a quick image of the last page I visited. This could be my facebook page, my email, or even a newspaper page. The image does not last more than a second. Why is this? Is this a security problem? Is there anything I can do to stop this? I'm worried about someone being able to 'hold' that quick image and work within it to read my mail, etc.


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