Use .mozconfig files in tor-browser repo for rbm builds

Right now, if we need to change .mozconfig files, we need to change them both in the tor-browser repository and in tor-browser-build (see the respective note in README.HACKING).

We should find a way to leave the .mozconfig files in the tor-browser repository for local builds outside of rbm (and only change them there when writing tor-browser patches) but use them nevertheless for rbm-based builds (probably with some modifications if needed).

added component::applications/tor browser in Legacy / Trac gitlab-tb-tor-browser-build in Legacy / Trac owner::tbb-team in Legacy / Trac priority::medium in Legacy / Trac severity::normal in Legacy / Trac status::new in Legacy / Trac tbb-rbm in Legacy / Trac type::defect in Legacy / Trac labels

Add magic gitlab keyword.

Trac:
Keywords: N/A deleted, gitlab-tb-tor-browser-build added

mentioned in issue legacy/trac#27623 (moved)

mentioned in issue legacy/trac#27623 (moved)

mentioned in issue legacy/trac#27623 (moved)

mentioned in issue legacy/trac#29766 (moved)

mentioned in issue legacy/trac#31308 (moved)

mentioned in issue legacy/trac#31918 (moved)

mentioned in issue tor-browser#31308 (closed)

moved from legacy/trac#23656 (moved)

added Bug label and removed 1 deleted label

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added Backlog label

added Roadmap::Future label and removed Backlog label

mentioned in issue tor-browser#40917 (closed)

marked this issue as related to #24385 (closed)

mentioned in issue #40477 (closed)

mentioned in merge request tor-browser!299 (merged)

marked this issue as related to #40477 (closed)

mentioned in merge request tor-browser!287 (merged)

mentioned in merge request !482 (closed)

mentioned in merge request !485 (merged)

added Backlog label and removed Roadmap::Future label

mentioned in issue #24387 (closed)

added Sponsor 131 label

assigned to @pierov

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added Task label

changed milestone to %Sponsor 131 - Phase 3 - Major ESR 102 Migration

This is done in d853ed93, for desktop. But not done yet for geckoview.

Doing in tor-browser!373 (merged).

But we should define a few variables before using them (e.g., setting JAVA_HOME again, if we stopped setting it).

removed Backlog label

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marked this issue as related to #40627 (closed)

added Sponsor 131 label

added Q4 label

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mentioned in merge request tor-browser!384 (merged)

mentioned in merge request !531 (merged)

removed Next label

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closed with merge request !531 (merged)

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