Items that match your search will be displayed. The Manage Cookies and Site Data dialog will appear. Click the menu button and select Settings. Click the menu button and select Options Preferences. In the Menu bar at the top of the screen, click Firefox and select Preferences. To delete cookies for any single website:
To delete cookies and site data for a website you're currently visiting:
3 Clear all cookies, site data and cache.1 Clear cookies for the current website.