[tor-bugs] #33697 [Applications/Tor Browser]: Investigate new Search Engine configuration

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#33697: Investigate new Search Engine configuration
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     Reporter:  acat                      |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
                                          |  TorBrowserTeam202003
Actual Points:                            |  Parent ID:  #33533
       Points:                            |   Reviewer:
      Sponsor:                            |
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 While working on #33533 I noticed that the engines configured in
 `list.json` were being ignored, and had to set the
 `browser.search.modernConfig = false` for them to work.

 I believe this is because of a new Search Engine configuration that has
 been enabled by default in nightly recently, this is the meta ticket is
 https://bugzilla.mozilla.org/show_bug.cgi?id=1542235.

 We should investigate this and see whether it's enough to flip that pref
 to get the behaviour we want.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33697>
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