Developer's Claude-assisted tool Glassbox exposes browser fingerprinting risk
Security engineer David Dale built a local, no-server tool that estimates how uniquely identifiable a browser is, crediting Claude Code for helping him build it.
What to know
- Glassbox runs entirely client-side (aside from a public geolocation API call) and checks 30+ fingerprinting signals: canvas, WebGL, font libraries, WASM features, API matrices, cross-site login state, and an audio-based sawtooth-wave technique found on AliExpress.
- Developer David Dale describes the 'identifiability' score as 'an honest model, not a measurement' since the tool has no live population data to compare against, unlike AmIUnique or EFF's Cover Your Tracks.
- Register reporter testing found Chrome rated 99% identifiable versus 56% for Tor Browser with an active circuit, illustrating that blending into a common configuration beats using a heavily customized 'hardened' browser.
- Dale says AI tools like Claude Code let a solo developer polish and publish niche security utilities that previously would have required a team.
“The single highest-impact move is to use a browser that puts you in a large, identical crowd. Counterintuitively, a heavily customized 'hardened' browser can make you more identifiable.”
David Dale, Glassbox developer · Email to The Register · Aug 23
David Dale Developer of Glassbox
The record 2 articles and posts · last 30 days
- summary covers to here · Aug 29, 7:31 AM · 1 piece above arrived after
What people are saying 4 voices from 1 site · verbatim
- Aug 30
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Was reading this little article from last week on The Register.co.uk. About Glassbox (their an Israeli IT security outfit who specialize in browser finger-printing). And I think I found a sadbox demoing their free finger-printing demo. I tried using it. But Adnauseum + UBlock Origin seemed to interfere with the finger-printing when it attempts to…
- Aug 26
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# security # privacy # DigitalFingerprints 'Glassbox provides a whole bunch of raw, unfiltered data you can sift through to see what makes your browser stand out, along with an estimate of how identifiable its fingerprint may be.' https://www. theregister.com/security/2026/…
- Aug 25
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Glassbox shows how browser fingerprinting can make users startlingly easy to track—without sending data to a server. The locally running tool analyzes 30+ signals, while its developer says Claude helped build it. The key takeaway: blending in beats standing out. 🕵️♂️🌐 https://www. theregister.com/security/2026/…
- Aug 24
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If you're curious how easily tech companies can fingerprint your browser and device and potentially single them out from the crowd, a new utility Glassbox will show you. Aside from pinging a public geolocation API, it runs entirely in your browser. https://www. theregister.com/security/2026/…