How to clear cookies on Firefox
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On desktop, click the three lines in the top-right corner and go to Settings > Privacy & Security. Scroll to "Cookies and Site Data" and click "Clear Data." Check "Cookies and Site Data" and click "Clear." On mobile, tap the three dots, go to Settings > Delete browsing data, select "Cookies," and tap "Delete browsing data." You can also set Firefox to automatically clear cookies when you close the browser under "Delete cookies and site data when Firefox is closed."