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Learn more about NetShield (Ad-blocker) (new window) Final thoughts Like all technological advances, browser and device fingerprinting can be used for good or ill, and they are undeniably a useful tool in the fight against banking, credit card, and e-commerce fraud. However, their widespread use by websites to track and any spy on their uses for advertising purposes is a clear privacy violation, made all the more insidious because it is so hard to prevent.