[tbb-bugs] #32649 [Applications/Tor Browser]: Provide one place for setting the Firefox build we use

[Tor Bug Tracker & Wiki]

#32649: Provide one place for setting the Firefox build we use
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-rbm
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 We set `ff_build` both in the config files for `firefox-locale-bundle` and
 `firefox-langpacks`. This is error-prone and we should have one canoncial
 place for it.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32649>
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