[tbb-bugs] #21387 [Applications/Tor Browser]: Enabling the bookmarks bar can allow websites to fingerprint you

[Tor Bug Tracker & Wiki]

#21387: Enabling the bookmarks bar can allow websites to fingerprint you
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     Reporter:  Dbryrtfbcbhgf             |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  High                      |  Milestone:  Tor: 0.2.9.x-final
    Component:  Applications/Tor Browser  |    Version:  Tor: 0.2.9.9
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 go to http://whatsmy.browsersize.com/and check the size of the browser
 window.
 then click on view in torbrowser and enable the bookmark bar. the go to
 http://whatsmy.browsersize.com/
 again and the size of your browser window will change from the default
 values. This can allow websites to uniquely identify users that have
 bookmark bar enabled.

 before enabling bookmark bar.
 Browser window width:   1000
 Browser window height:  500
 Screen width:   1000
 Screen height:  500
 Screen color depth:     24

 After enabling bookmark bar.
 Browser window width:   1000
 Browser window height:  477
 Screen width:   1000
 Screen height:  477
 Screen color depth:     24

 tor browser version tested.
 6.5 (based on Mozilla Firefox 45.7.0)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21387>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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