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Re: [tor-bugs] #26606 [Applications/Tor Browser]: investigate fingerprinting and linkability risks of the Intersection Observer API
#26606: investigate fingerprinting and linkability risks of the Intersection
Observer API
-------------------------------------------------+-------------------------
Reporter: mcs | Owner: tbb-
| team
Type: defect | Status: new
Priority: High | Milestone:
Component: Applications/Tor Browser | Version:
Severity: Normal | Resolution:
Keywords: tbb-fingerprinting, tbb- | Actual Points:
linkability, ff60-esr, TorBrowserTeam201808 |
Parent ID: | Points:
Reviewer: | Sponsor:
-------------------------------------------------+-------------------------
Comment (by Thorin):
This is a no brainer. Disable it, IMO
https://github.com/ghacksuserjs/ghacks-user.js/blob/master/user.js
{{{
/* 2426: disable Intersection Observer API (FF53+)
* Almost a year to complete, three versions late to stable (as default
false),
* number #1 cause of crashes in nightly numerous times, and is
(primarily) an
* ad network API for "ad viewability checks" down to a pixel level
* [1]
https://developer.mozilla.org/docs/Web/API/Intersection_Observer_API
* [2] https://w3c.github.io/IntersectionObserver/
* [3] https://bugzilla.mozilla.org/1243846 ***/
user_pref("dom.IntersectionObserver.enabled", false);
}}}
down to a pixel level ... a. pixel. level
PS: since we added this to our user.js back in 53 (16 months ago), we've
had zero issues or complaints about website breakage etc
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26606#comment:7>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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