The Zscaler Likejacking Prevention keeps you safe from Facebook scams that hide widgets such as ‘Like’ buttons on third party pages, using a technique known as clickjacking. With Likejacking, attackers exploit the Facebook Like button and other Facebook widgets, to spread spam and propagate scams by tricking users into advertising the malicious content via their own Facebook profiles.

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http://www.zscaler.com/research/plugins/firefox/likejacking/zscaler-likejaking-prevention-latest.xpi