[tor-bugs] #34315 [Applications/Tor Browser]: avoid reading policies from /etc/firefox on Linux

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#34315: avoid reading policies from /etc/firefox on Linux
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     Reporter:  mcs                       |      Owner:  mcs
         Type:  defect                    |     Status:  assigned
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
                                          |  TorBrowserTeam202006
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Georg noticed that Firefox 77 and ESR 68.9 will include a fix for this
 bug:
 "Read Linux policy from etc/opt directory"
 https://bugzilla.mozilla.org/show_bug.cgi?id=1469629

 Here is the patch:
 https://hg.mozilla.org/releases/mozilla-
 esr68/rev/203a8c227a997c4ae7e970d0ec497d7292078d5c

 Unfortunately, with that patch in place, policies will be read from
 /etc/firefox/policies/policies.json if it exists. For Tor Browser we do
 not want that behavior.

 In the short run we can back out the Mozilla patch. In the long run should
 we handle this via a fixup for our #32418 patch.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34315>
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