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Roy Fish’s report describes how websites can combine network details and device measurements to recognize a browser even after cookies are cleared or a VPN is used. The report warns that this can support advertising and data profiling, but it does not establish how widely advertisers currently use fingerprinting or verify every claim it makes about Google’s policies.
Roy Fish’s report describes how websites can recognize a browser by combining network information with measurements of the device running it, potentially tracking visitors after they clear cookies or connect through a VPN. The account raises concerns about online advertising and data profiling, while leaving unclear how prevalent the practice is across ad platforms and what specific safeguards apply.
Fingerprinting begins with information a browser sends when it connects to a website, including its browser type, language, operating system and IP address. A site can then run code in the browser to measure characteristics such as graphics behavior, processor activity, memory, screen settings and available fonts. Fish says combinations of these signals can distinguish browsers even when each signal on its own is shared by many devices.
The report argues that those measurements may persist when users clear cookies, browse privately or change networks. Some inputs are less stable: IP addresses can change when people switch networks, use mobile data or connect through a VPN. Device and software characteristics may remain more consistent, according to the report, though the source provides no test results or measured error rates.
Fish also links fingerprinting to the broader advertising business, saying identifiers could be used to select ads and potentially connect browsing activity to information held by services where a person has an account. Those are presented as risks and scenarios, not documented examples of a particular company selling a specific person’s data. The report does not provide evidence about the scale of such data sharing.
Fingerprinting matters because it can weaken the practical effect of controls that target cookies. A person may delete stored cookies or use a VPN and still present a combination of browser and device signals that a site can use to distinguish that browser. Recognition does not necessarily reveal a person’s legal identity by itself, but it can allow activity to be grouped under a persistent identifier.
That possibility complicates privacy choices for readers. A cookie banner or private browsing mode may address some forms of storage or local history without preventing a website from measuring its environment. The report’s examples show why privacy protections need to address the collection and use of device signals as well as familiar tracking files.
Fish further argues that aggregated records can be valuable because they reveal patterns across groups, not only information about a named individual. That is an interpretation of the data business rather than a quantified finding in the source. The report gives no estimate of the financial value, number of users affected or resulting impact on advertising decisions.
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The report places fingerprinting in the debate over third-party cookies, which have faced restrictions in browsers such as Safari and Firefox. It says Google pledged in 2020 to phase out third-party cookies and pursued its Privacy Sandbox proposals, but later chose to retain cookies. These claims are not accompanied in the supplied source by links to announcements, dates for each policy change or independent documentation.
Fish characterizes Google’s approach as a shift from cookie removal toward other measures, and says a proposed IP-masking feature was not delivered as described. Those characterizations should be read as the report’s account; the source does not set out the relevant product terms or regulatory findings in detail. The broader point is that changes to one tracking method can leave other identification techniques in use.
Browser defenses also vary. The report says some privacy-focused browsers try to make users’ fingerprints less distinctive: Brave adds variation, a technique it calls “farbling,” while Tor and Mullvad aim to make browsers resemble one another. These approaches can reduce the usefulness of fingerprinting, but the report does not claim they eliminate all tracking or assess their effectiveness across sites.
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How Broad Is Its Use?
The source does not establish how many websites or advertisers use fingerprinting, how often it succeeds, or which companies connect fingerprints to named account holders. It offers a technical explanation and hypothetical privacy risks, but no independent audit, dataset or case study to quantify those practices.
It is also unclear how well any given browser defense works across different devices and websites, or how protections vary by browser version. The report’s statements about Google’s cookie plans and IP masking would require current company documentation and other reporting to verify their precise status.
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Evidence Needed on Deployment
To establish the scale of fingerprinting, further reporting would need to document which services collect these signals, how they combine them and whether the resulting identifiers are used for advertising or other purposes. Audits comparing browser behavior across devices and sessions could also show how reliably fingerprints persist and how much common defenses reduce recognition.
Readers assessing a particular browser or service can consult its current privacy documentation for details on fingerprinting protections and data use. The supplied report does not identify a forthcoming regulatory decision, company announcement or technical milestone, so the next developments remain unspecified.
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Key Questions
What is browser fingerprinting?
It is a way of distinguishing browsers by combining details such as browser settings, operating system, language and device behavior. A site may gather some information from a connection and measure other characteristics through code running in the browser.
Does clearing cookies stop fingerprinting?
Clearing cookies removes stored cookie data, but it may not change the device and software characteristics used to form a fingerprint. The report says those characteristics can allow recognition to continue, though it gives no success-rate measurements.
Does a VPN prevent browser fingerprinting?
A VPN can change the IP address visible to a website, but it does not necessarily change other signals, such as screen settings or browser behavior. Fish describes the IP address as one input among several.
Which browsers does the report identify as offering defenses?
Fish discusses Brave’s use of added variation, called farbling, and says Tor and Mullvad aim to make browsers look more alike. The report does not provide comparative test results for these approaches.
Source: hn
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