[tor-bugs] #10833 [Firefox Patch Issues]: Screen resolution should not be identical to window size

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#10833: Screen resolution should not be identical to window size
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 Reporter:  ben                   |          Owner:  mikeperry
     Type:  defect                |         Status:  new
 Priority:  normal                |      Milestone:
Component:  Firefox Patch Issues  |        Version:
 Keywords:                        |  Actual Points:
Parent ID:                        |         Points:
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 TorBrowser design doc
 https://www.torproject.org/projects/torbrowser/design/ states re screen
 resolution:
 "report that the desktop is only as big as the inner content window"

 Indeed, when I go to <http://browserspy.dk/screen.php> with TorBrowser, I
 get a screen size of 1057x909.

 This is an obvious way to find out Tor users, and also allows to track
 them even better than without this change. A screen (!) resolution of
 1057x909 must really stand out and allow to track a user easily. This
 would stay the same across all sessions and sites and even reboots.

 A window/content resolution of 1057x909 isn't very common either and
 problematic, but that problem exists independent of the screen resolution.
 This issue isn't theoretical: I heard about 5 years ago that even Google
 tracks users based on non-standard window resolution.

 That said, a **screen** resolution of 1057x909 would appear only among
 TorBrowser users and thus be fairly unique world-wide.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10833>
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