[tbb-bugs] #30850 [Applications/Tor Browser]: Move not UI-related torbutton.js code to XPCOM component/service

[Tor Bug Tracker & Wiki]

#30850: Move not UI-related torbutton.js code to XPCOM component/service
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     Reporter:  acat                      |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-torbutton
Actual Points:                            |  Parent ID:  #28745
       Points:                            |   Reviewer:
      Sponsor:                            |
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 `torbutton_init()` is the entry point: we should start there, find out
 which code does not need to be loaded for every window and move it to a
 new or existing component.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30850>
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