STEP-BY-STEP
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1Click on the Tools bar (three bars in the top-right corner).
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2Click History.
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3On the menu to the right, select Clear Recent History.
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4In the Clear All History menu, select the time range to Everything.
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5Select the options, Cookies, Cache, Active Logins, Site settings, and Offline website data.
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6Click OK.
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7If on a Windows computer, close and re-open Firefox to save your changes. If on an Apple computer, go to the Firefox menu on the top menu bar and select Quit for the changes to take effect.