#31954: Make sure -webkit-device-pixel-ratio is no fingerprinting risk -------------------------------------------------+------------------------- Reporter: gk | Owner: tbb- | team Type: task | Status: closed Priority: Medium | Milestone: Component: Applications/Tor Browser | Version: Severity: Normal | Resolution: fixed Keywords: tbb-fingerprinting-resolution, | Actual Points: 0.1 ff68-esr, TorBrowserTeam201910 | Parent ID: | Points: 0.25 Reviewer: | Sponsor: -------------------------------------------------+------------------------- Changes (by gk):
* keywords: tbb-fingerprinting, ff68-esr, TorBrowserTeam201910 => tbb- fingerprinting-resolution, ff68-esr, TorBrowserTeam201910 * status: new => closed * resolution: => fixed * actualpoints: => 0.1 Comment: The Mozilla ticket actually flips just a pref. The implementation work got done back in https://bugzilla.mozilla.org/show_bug.cgi?id=1176968. One can see from the test at https://hg.mozilla.org/mozilla- central/rev/48f644f1c41e that the webkit version is essentially an alias for the moz version (as the [https://developer.mozilla.org/en- US/docs/Web/CSS/@media/-webkit-device-pixel-ratio implementation notes in the Browser compatibility table for Firefox] say). `GetScreenPixelsPerCSSPixel()` calls `GetDevicePixelRatio()` and that in turn `GetDevicePixelRatioOuter()` which is taking care of our fingerprinting concerns (https://searchfox.org/mozilla- esr68/source/dom/base/nsGlobalWindowOuter.cpp#3685). So, we are good here. -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31954#comment:1> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
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