[tbb-bugs] #13400 [Tor Browser]: Canvas Fingerprinting: fonts

[Tor Bug Tracker & Wiki]

#13400: Canvas Fingerprinting: fonts
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 Reporter:  cypherpunks   |          Owner:  tbb-team
     Type:  defect        |         Status:  needs_information
 Priority:  High          |      Milestone:
Component:  Tor Browser   |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  tbb-testcase  |  Actual Points:
Parent ID:                |         Points:
  Sponsor:                |
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Comment (by gacar):

 There's at least one vendor who uses measureText for font
 probing/fingerprinting.
 http://mathid.mathtag.com/device/id.js

 So it'd be great to round its result, or ask for permission.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13400#comment:15>
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