[tbb-bugs] #25389 [Applications/Tor Browser]: backport Subprocess.jsm runaway CPU fix (Mozilla 1370027)

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#25389: backport Subprocess.jsm runaway CPU fix (Mozilla 1370027)
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     Reporter:  mcs                       |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:  #24689
       Points:                            |   Reviewer:
      Sponsor:  Sponsor4                  |
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 It turns out that the Moat runaway CPU issue that gk reported (see
 ticket:23136#comment:53) is something that Mozilla already found. To fix
 it in Tor Browser, we need to backport the "Part 1" patch from
 https://bugzilla.mozilla.org/show_bug.cgi?id=1370027.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25389>
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