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In my four-browser run of the Electronic Frontier Foundation’s Cover Your Tracks test, one browser stood apart from the other three. That is an observation from my test, not a verified browser ranking: the available test records do not identify the browsers, versions, devices, settings, dates, or results. Without those details, readers cannot reproduce the comparison or tell which factor explains the difference.
What Cover Your Tracks measures
EFF’s Cover Your Tracks shows characteristics a website may be able to observe and uses them to assess how distinctive a browser appears. Fingerprinting combines multiple signals; no single value, such as screen size or user-agent string, tells the whole story. EFF’s guide describes signals including HTTP headers, timezone, screen dimensions, fonts, cookie behavior, canvas and WebGL characteristics, language, platform, touch support, and hardware-related values. Which signals are visible depends on the browser and test conditions.
EFF describes the test as a view of the characteristics it measures, not a comprehensive privacy audit. Its results page cautions: “Note: because tracking techniques are complex, subtle, and constantly evolving, Cover Your Tracks does not measure all forms of tracking and protection.” A uniqueness estimate or score should therefore not be treated as a complete privacy rating.
What it means that one browser stood apart
The result indicates that, in that session, one browser’s measured profile differed from the other three. It does not establish that the browser is safer, more anonymous, or consistently less identifiable. Browsers, operating systems, settings, extensions, and test conditions can all affect the combination of signals. EFF’s test does not provide the four results described in the headline, so the specific standout cannot be independently identified from the available records.
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A useful comparison would report the same test outputs for each browser and distinguish the following questions:
- Identifiability: How distinctive did the test report each browser’s measured fingerprint to be?
- Exposed or blocked characteristics: Which signals were available, restricted, or blocked?
- Repeatability: Did the reported characteristics change across repeated runs? Include this only if repeated runs were actually performed.
- Usability: Did the privacy settings interfere with sites or features the user needs?
These are ways to interpret one controlled comparison, not a universal ranking of browsers. EFF’s results page may show session-specific sample sizes, uniqueness estimates, or entropy values; those outputs are not stable statistics about a browser across users and conditions.
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How to make a four-browser comparison reproducible
Run the same test under conditions you record, then preserve the results for each browser. At minimum, note:
- Browser name and version.
- Operating system and device.
- Privacy settings and installed extensions that could affect tracking or fingerprinting.
- Test date and whether the run was repeated.
- The specific result fields being compared, rather than a single overall score.
Keeping those details together makes it possible to separate a browser difference from changes in configuration or test environment. If settings or extensions differ between browsers, describe that clearly instead of attributing the outcome to the browser alone.
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How to test your browser fingerprint
- Open EFF’s Cover Your Tracks test in the browser you want to examine.
- Review the reported characteristics and the test’s assessment of how distinctive they are.
- Record the browser version, device and operating system, relevant settings and extensions, date, and result fields.
- Repeat under the same conditions if you want to assess whether results vary between runs; do not infer stability from a single test.
- For a comparison, apply the same process to each browser and avoid treating a result as a complete measure of privacy.
What you can change—and the tradeoffs
Tracker blockers and built-in privacy settings can reduce some tracking, but blocking tracker requests does not prove that fingerprinting is prevented. EFF identifies Tor Browser and Brave as examples of browsers designed to resist fingerprinting; their approaches differ, and no browser should be presented as guaranteeing anonymity or protection from every tracking method.
EFF also explains that disabling JavaScript can reduce information available to fingerprinting scripts, but may break or limit website features. Altering one fingerprint characteristic to make it look more common can backfire if the resulting combination becomes more unusual. Consider the combined profile and the sites you need to use, rather than tuning one value to improve a test result.
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EFF Privacy Badger is one tracker-blocking extension example. Its blocking function should not be mistaken for a guarantee against all fingerprinting. EFF’s 2025 flyer lists supported browsers.
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Running the test sends browser and device characteristics to EFF. Its privacy policy describes potential collection, including user agent and headers, screen properties, timezone, plugin or extension information, fonts, JavaScript availability, cookie behavior, canvas and WebGL hashes, language, and platform, as well as limited housekeeping information. EFF says anonymous results contribute to its research on the project page. Review the current policy before testing if you want to understand the information involved.
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