#28372: determine if onvisibilitychange is a fingerprinting vector -------------------------------------+------------------------------------- Reporter: mcs | Owner: tbb-team Type: defect | Status: new Priority: Medium | Milestone: Component: Applications/Tor | Version: Browser | Keywords: tbb- Severity: Normal | fingerprinting,ff60-esr Actual Points: | Parent ID: Points: | Reviewer: Sponsor: | -------------------------------------+------------------------------------- In Firefox 56, Mozilla added support for onvisibilitychange. See: https://developer.mozilla.org/en- US/docs/Web/API/Document/onvisibilitychange https://bugzilla.mozilla.org/show_bug.cgi?id=1333912
We should think about whether this introduces any new fingerprinting risks. The following mentions a prerender state which we (mcs and brade) do not fully understand: https://w3c.github.io/page-visibility/#privacy-security -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28372> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
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