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

[Tor Bug Tracker & Wiki]

#21766: Tor Browser based on ESR52 with e10s enabled crashed while trying to
download a file
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 Reporter:  gk                                   |          Owner:  mcs
     Type:  defect                               |         Status:
                                                 |  needs_review
 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 mcs):

 This patch seems to fix both this ticket and #21886 on OSX as well. One
 caveat is that sometimes after starting to download a very small file and
 clicking "Cancel" on the Torbutton-provided warning prompt, subsequent
 attempts to download the very small file hang (the page stays in the
 loading state). That could be a different problem though, so for now Kathy
 and I are going to wait for feedback about Windows and for a code review.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21766#comment:36>
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