[tor-bugs] #20083 [Applications/Tor Browser]: `app.update.enabled` should remove updater UI elements when set to false.

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#20083: `app.update.enabled` should remove updater UI elements when set to false.
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     Reporter:  yawning                   |      Owner:  tbb-team
         Type:  enhancement               |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 I have a use case that requires setting `app.update.enabled` to false.

 This mostly works as I expect, however the UI element for forcing a manual
 update check in the `Help->About Tor Browser` dialog still remains visible
 and functional.  If the updater is disabled, the UI elements associated
 with it should be hidden.

 On a side note, it would be nice if the built in updater could be force
 disabled at launch time via an env var as well, for those most special of
 snowflakes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20083>
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