[tbb-bugs] #30862 [Applications/Tor Browser]: 10ms time precision via EXSLT date-time function

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#30862: 10ms time precision via EXSLT date-time function
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  High                      |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-fingerprinting
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 z3t reported at HackerOne that the EXSLT date-tme function is subverting
 our patches that set the timing granularity to 100ms. We get at least a
 10ms precision that way. PoC is on
 https://people.torproject.org/~gk/tests/tor_xml_time.html. And see
 dom/xslt/xslt/txEXSLTFunctions.cpp for the `date:date-time`
 implementation.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30862>
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