Opera 28.0 (Mac) - Clearing Cache and Cookies
This document explains how to clear the cache and cookies in Opera 28.0
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Click on Opera and then click on Clear Private Data....
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From the "Obliterate the following items from:" drop down menu, choose the beginning of time. Then check Empty the cache and Delete cookies and other site data. Lastly as the final step, click on Clear Browsing Data.