[tor-bugs] #21340 [Applications/Tor Browser]: Identify and backport new patches from Firefox

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#21340: Identify and backport new patches from Firefox
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 Reporter:  arthuredelstein                      |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ff52-esr, TorBrowserTeam201704R,     |  Actual Points:
  tbb-7.0-must-alpha                             |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor4
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Comment (by arthuredelstein):

 I should also mention I attempted to rebase the implementation patch from
 https://bugzilla.mozilla.org/show_bug.cgi?id=1342178 but found that it
 didn't seem to fix the problem described on that ticket. So I'm leaving it
 out for now.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21340#comment:21>
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