[tor-bugs] #28434 [Applications/Tor Browser]: Windows Size issue

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#28434: Windows Size issue
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 Reporter:  aerpel              |          Owner:  tbb-team
     Type:  defect              |         Status:  new
 Priority:  Medium              |      Component:  Applications/Tor Browser
  Version:  Tor: 0.2.9.16       |       Severity:  Normal
 Keywords:  window size         |  Actual Points:
  adjustment                    |
Parent ID:                      |         Points:
 Reviewer:                      |        Sponsor:
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 I ran the Tor Browser bundle on Debian stretch/stable (installed via the
 Debian repostories).
 As DE, I am using KDE (plasma 5.8.6), with default taskbar/window frame
 sizes.
 My screens resolution is 1680x1050.
 I started using the Tor Browser with version 8.0 on this machine, and the
 issue has existed since.

 Expected behaviour:
 When opening the Thor browser, the windows height automatically adjusts to
 a multiple of 100 (<=1000) and a width of 1000.

 Actual behaviour:
 The windows opens in a size of 1000x895.

 It seems that monitor height minus the Tor Browser Window title bar, the
 tab bar, the address bar and the KDE panel is 895 pixel.
 Somehow the Tor Browser thinks it can reach 900 (which it cannot) and
 therefore, a size of 895 is reached, instead of the correct 800.

 Therefore the whole concept of default windows sizes against browser
 fingerprinting is circumvented.

 The window's size was determinded by www.panoticlick.eff.org, which was
 used to check how effective the Tor browser is against fingerprinting.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28434>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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