[tbb-bugs] #13019 [Tor Browser]: New locale fingerprinting capabilities in FF31ESR

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#13019: New locale fingerprinting capabilities in FF31ESR
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     Reporter:           |      Owner:  tbb-team
  mikeperry              |     Status:  needs_review
         Type:  defect   |  Milestone:
     Priority:  major    |    Version:
    Component:  Tor      |   Keywords:  ff31-esr, tbb-fingerprinting,
  Browser                |  MikePerry201409R, TorBrowserTeam201410
   Resolution:           |  Parent ID:
Actual Points:           |
       Points:           |
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Comment (by mikeperry):

 Ok. Is there a reason why there is a 5926+ branch in your repo, but not
 this patch? I was looking at that branch for a while, and it seemed to fix
 these problems but did not use the RegisterCallback/UnregisterCallback, as
 the attachment does.

 I'm a little nervous about the use of free() to free stuff allocated with
 the JS-runtime allocators. They appear to all boil down to the same
 js_free right now, but that may change? Not sure if we should put this as
 an XXX, or what. The JS_Free() calls do not seem to match JS_Strdup used
 by JS_GetDefaultLocale, in that they don't take a JSRuntime as an
 argument...

 We also still need to set this new pref in the Torbutton code that sets
 extensions.torbutton.spoof_*, too.

 I am thinking for both of these reasons this might not make it into the
 FF31 release on Tuesday, but we should perhaps aim for the next release
 after that for this.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13019#comment:9>
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