[tor-bugs] #25147 [Applications/Tor Browser]: Backport of fix shipped in Firefox 58.0.1?

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#25147: Backport of fix shipped in Firefox 58.0.1?
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 Reporter:  gk                        |          Owner:  pospeselr
     Type:  task                      |         Status:  needs_review
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  TorBrowserTeam201803R     |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by gk):

 Thanks, looks good to me. I wonder whether we have some means to find out
 if there are instances of this problem that are solely on the ESR 52
 branch which Mozilla did not deem worth enough to write a defense-in-depth
 for. But anyway, that should give us at least the protections available on
 -release.

 (And lucky me pointing to the patch on the release branch, the thing that
 landed oridinally on `mozilla-central` is slightly different and not
 complete, which is easily to overlook).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25147#comment:5>
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