[tor-bugs] #20210 [Applications/Tor Browser]: Update from 6.5a2 to 6.5a3 on OSX breaks Tor Browser

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#20210: Update from 6.5a2 to 6.5a3 on OSX breaks Tor Browser
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 Reporter:  mrphs                     |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Very High                 |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Major                     |     Resolution:
 Keywords:  TorBrowserTeam201609      |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by rdump):

 I am also able to reproduce the problem in Tor Browser 6.0.5 when a
 separate alpha series is upgraded to 6.5a3, or is freshly installed, on
 the same machine.

 Updating an alpha series Tor Browser from 6.5a2 to 6.5a3 causes a
 previously updated stable series Tor Browser 6.0.5, when launched
 subsequently on the same Mac OS X/macOS system, to show the same control
 port failure symptom.  Ditto a freshly installed 6.0.5.  This behavior was
 noted on 3 separate Mac OS X systems (2x 10.11.6, 1x 10.12).

 On the affected machines, the prefs.js edit to add
 'user_pref("extensions.torlauncher.control_port_use_socket", false);'
 allows 6.0.5 and 6.5a3 versions to both connect again.

 This suggests the cause is coupled to the changes made in shared resources
 at "~/Library/Application Support/TorBrowser-Data/Browser/..." by the
 6.5a3 upgrade.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20210#comment:15>
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