From the start, Google's Safe Browsing API was designed to spot malicious web pages so users wouldn't get trapped in them. Google identifies these sites through its own algorithms and user notification.

Google Chrome isn't the only browser to do this. FireFox and Safari rely on the lists made available in the Safe Browsing API, and Microsoft has its Application Reputation with Internet Explorer, which essentially does the same thing.

This week, NSS Labs, a firm that specializes in the testing of security systems, found something in its monitoring that just didn't feel right.

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