[tbb-bugs] #26365 [Applications/Tor Browser]: Backport AltSvc/SOCKS patch to ESR60

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#26365: Backport AltSvc/SOCKS patch to ESR60
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     Reporter:  arthuredelstein           |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Patrick McManus wrote a patch for using Alternate Service with SOCKS that
 landed in Firefox 62
 (https://bugzilla.mozilla.org/show_bug.cgi?id=1463509). This would be
 useful for us, especially for AltSvc onions. So we'd like to backport to
 ESR60. Turning this on will require completing our audit of HTTP2 and
 AltSvc mechanism in particular to make sure it respects FPI.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26365>
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