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Clear Browsing History clears your browsing history
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Clear Download history clears your list of recent downloads
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Empty the Cache empties your cache
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Delete cookies and otehr site plug-in data deletes information websites have stored about you in your browser
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Clear saved passwords clears your saved passwords
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Clear saved Autofill form data clears your Autofill
In order to clear your cache, you must have "Empty the cache" selected. All other items can be selected if you want, it's up to you.
Click "Clear Browsing Data" to save these changes