[tor-bugs] #19528 [Applications/Tor Browser]: The build id stays the same with every Firefox update

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#19528: The build id stays the same with every Firefox update
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 Reporter:  gk                        |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:                            |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by boklm):

 Replying to [comment:7 gk]:
 > Replying to [comment:6 boklm]:
 > > I have not yet tried doing a build using this branch. I can also
 change it to use the version from `browser/config/version.txt` rather than
 the Tor Browser version if that's better.
 >
 > Yes, that would be better because currently this breaks building Tor
 Browser using already built artifacts in case we don't need to rebuild the
 browser part: Users building, say 7.0.2, from scratch would get a
 different result than we which just redid the bundle part and used, say
 7.0.1, otherwise (maybe 7.0.2 just needed a newer Torbutton). So, we need
 something that changes only if a newer Firefox is built to construct
 `MOZ_BUILD_DATE`.

 However, we are already using the Tor Browser version as a firefox
 configure argument `--with-tor-browser-version=${TORBROWSER_VERSION}`
 which is then used in a few places in the updater, so we already can't
 change the Tor Browser version without rebuilding the firefox part.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19528#comment:8>
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