[tbb-bugs] #27045 [Applications/Tor Browser]: Add option for firefox incremental builds

[Tor Bug Tracker & Wiki]

#27045: Add option for firefox incremental builds
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     Reporter:  boklm                     |      Owner:  tbb-team
         Type:  task                      |     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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 In Tor Browser builds, when we need to rebuild firefox, we do a full
 firefox rebuild. During the development of firefox patches it would be
 useful to be able to do incremental rebuilds of firefox.

 To do that, we could add a new makefile target for this type of build and
 an option in `rbm.local.conf` pointing to the firefox sources directory.
 We would then mount that directory in the build container and use it
 instead of the sources from git.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27045>
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