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[tor-bugs] #13027 [Tor Browser]: Ensure WebWorkers see spoofed navigator.* values

#13027: Ensure WebWorkers see spoofed navigator.* values
-------------------------------------------------+-------------------------
 Reporter:  mikeperry                            |          Owner:  tbb-
     Type:  defect                               |  team
 Priority:  major                                |         Status:  new
Component:  Tor Browser                          |      Milestone:
 Keywords:  ff31-esr, tbb-fingerprinting,        |        Version:
  TorBrowserTeam201409                           |  Actual Points:
Parent ID:                                       |         Points:
-------------------------------------------------+-------------------------
 We spoof the navigator values through various general.useragent.override
 prefs. However, this object is now exposed to WebWorkers too, which may or
 may not be listening to these new prefs (because WebWorkers are special
 threads and have restricted access to much of XPCOM).

 https://bugzilla.mozilla.org/show_bug.cgi?id=925847

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13027>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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