[tor-bugs] #29049 [Applications/Tor Browser]: Backport JS Poison Patch

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#29049: Backport JS Poison Patch
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 Reporter:  tom                                  |          Owner:  tbb-
                                                 |  team
     Type:  enhancement                          |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-security, TorBrowserTeam201903,  |  Actual Points:
  GeorgKoppen201903, tbb-8.5                     |
Parent ID:  #28707                               |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by gk):

 It seems we want to have at least
 https://bugzilla.mozilla.org/show_bug.cgi?id=1415852 as well for
 `AlwaysPoison()`. This gets slightly more complicated than I had hoped.
 Thus, I am not sure whether we should actually backport that ourselves. I
 guess really cool would be an esr60 patch Mozilla folks working on those
 bugs do like.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29049#comment:8>
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