When you click Clear History, also click Delete Files. The history is just the list of visited website. The Files (aka Cache) are the little bits of each website you visit, such as images and other details, so that you don't have to download them each time.
"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited
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