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Do Not Fool


A feature that allows users to set a browser preference that will broadcast their desire to opt-out of April Fool's jokes by transmitting 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"

Please, read more on Mozilla Labs blog - http://mozillalabs.com/blog/2011/04/protecting-users-from-an-age-old-threat/

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