[tor-bugs] #31601 [Applications/Tor Browser]: Don't let Mozilla recommend extensions again

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#31601: Don't let Mozilla recommend extensions again
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  TorBrowserTeam201909, tbb-9.0-must-  |  Actual Points:
  alpha, ff68-esr                                |
Parent ID:                                       |         Points:  0.25
 Reviewer:                                       |        Sponsor:
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Comment (by Thorin):

 All new prefs added in FF68

 {{{
 user_pref("extensions.getAddons.discovery.api_url", "");
 user_pref("extensions.htmlaboutaddons.discover.enabled", false);
 user_pref("extensions.htmlaboutaddons.recommendations.enabled", false);
 }}}

 This disables recommendations in about:addons' Extensions and Themes panes
 and removes/hides any leftover UI bits and bobs

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31601#comment:4>
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