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The flaw, as discovered by Estonian Apple Site AppleSpot: If the user visits a site which uses Motion-JPEG (most commonly used for security cams and live feeds) in Safari, Safari will continue to gobble up bandwidth even after Safari is closed. Safari is one of the few apps that Apple allows to process in the background, and Motion-JPEG streams appear to continue streaming, even if the stream is in another tab or in the “closed” application. Apple gives no indication that Safari will continue to stream – and considering that most applications on the platform aren’t granted such privileges, it’s unlikely that a lay user would understand the consequences.

mobilecrunch.com