Do Not Fool A Firefox extension designed to notify websites that you do not want to be fooled on April Fools’ Day
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Do Not Fool Description

Do Not Fool is a Firefox add-on designed to enable users to set a browser preference that will broadcast their desire to opt-out of April Fool's jokes. It transmitts a Do Not Fool HTTP header with every click or page view in Firefox. In order to enable the feature, go to Preferences > Advanced and click the checkbox next to "Tell web sites I do not want to be fooled".

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