Firefox Fake Security Alerts
G Data, a German antivirus company, recently discovered a Trojan that causes Firefox users to get fake security warnings. The fake security alert looks much like the genuine security alerts, so be careful. The genuine alert does not ask you to download virus protection.

Firefox Fake Security Alert

Firefox Genuine Security Alert
If the fake alert pops up, it means your computer is infected with the Trojan already, and you should update your antivirus and do a full scan. If you click on the get virus protection button, you will be directed to the website where the criminals do business, so they can trick you into giving them your credit card information.
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