![]() This combining of browser signals to create a unique identifier is known as browser fingerprinting. These discrepancies provide a source of entropy that when combined with other unique signals, can identify a specific user over multiple visits. By testing whether certain page elements are blocked, a site can find discrepancies in the filters used by your specific ad blocker(s). If you are reading this article on ad blocker technology, you almost undoubtedly have one installed.Īd blockers leave a trace that can be harnessed by the websites you visit to identify you. Around 26% of Americans use an ad blocker today. This novel browser fingerprinting method, while oft-discussed as a theoretical source of entropy, has only just been added to FingerprintJS as of April 2021, and has never been fully described until now.Īd blockers are an incredibly pervasive and useful piece of technology. In this article, we show how signals generated by the use of an ad blocker can improve browser fingerprinting accuracy. Editor's note: we have made some changes to the article introduction for tone and clarity.
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