[tbb-bugs] #30647 [Applications/Tor Browser]: Letterboxing and Scrollbars Dimensions

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon May 27 21:03:09 UTC 2019

#30647: Letterboxing and Scrollbars Dimensions
 Reporter:  edgewall  |          Owner:  tbb-team
     Type:  defect    |         Status:  new
 Priority:  Medium    |      Component:  Applications/Tor Browser
  Version:            |       Severity:  Normal
 Keywords:            |  Actual Points:
Parent ID:            |         Points:
 Reviewer:            |        Sponsor:
 Letterboxing's reason of existence is to improve the users' privacy by
 reducing yet another fingerprinting bit. But the solution isn't perfect -
 there are many operating systems and window managers, and countless
 themes. And every one of them can have different scrollbar dimensions -
 which helps to fingerprint the user.

 For example, in a page with a vertical scrollbar my window widths is being
 reported as 984px instead of 1000px with Tor Browser's "content window
 dimensions rounding" (#14429), or 1184px instead of 1200px with FF67's

 Would it be possible to maybe move the scrollbars (both vertical and
 horizontal) out of the "letterbox"?

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30647>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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