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Do Not Fool 1.0.1-signed.1-signed
A feature that allows you to notify websites that you do not want to be fooled.
About this Add-on
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/