[tor-bugs] #21766 [Applications/Tor Browser]: Tor Browser based on ESR52 with e10s enabled crashed while trying to download a file

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#21766: Tor Browser based on ESR52 with e10s enabled crashed while trying to
download a file
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  mcs
     Type:  defect                               |         Status:
                                                 |  needs_information
 Priority:  Very High                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Critical                             |     Resolution:
 Keywords:  ff52-esr, tbb-e10s, tbb-crash,       |  Actual Points:
  TorBrowserTeam201705R, tbb-7.0-must            |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor4
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Comment (by gk):

 I thought about testing #17933 for #20685 and I realized that the former
 is affected by this bug as well: while your patch is working for me when
 downloading the *.dmg mentioned in the description I can't download PDF
 files by clicking on the download button in the PDF viewer. While the tab
 is not crashing it shows the same symptoms as #21886 (but e10s is
 enabled).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21766#comment:45>
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