[tor-bugs] #29611 [Applications/Tor Browser]: Work around lack of app.update.enabled pref in Firefox 63+

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#29611: Work around lack of app.update.enabled pref in Firefox 63+
------------------------------------------+-----------------------
     Reporter:  dcf                       |      Owner:  tbb-team
         Type:  enhancement               |     Status:  assigned
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  meek moat
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Firefox 63 removes the app.update.enabled pref that we used to prevent the
 meek and Moat profiles from downloading their own updates (#14203).
 https://bugzilla.mozilla.org/show_bug.cgi?id=1420514

 As far as I can tell, there isn't a replacement for the pref. The attached
 patch works around it by setting other prefs:
 {{{
 user_pref("app.update.interval", 999999999); // don't check for updates
 user_pref("app.update.auto", false); // if downloaded, don't automatically
 install
 user_pref("app.update.doorhanger", false); // don't show an update notice
 in the UI
 }}}

 I noticed this while testing with a newer Firefox in #28168. I tested
 setting these prefs in a Tor Browser 8.0.6, and they didn't have any
 harmful effect.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29611>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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