Rebase firefox alpha to esr102.7

Merge Info

• Related Issues

  • tor-browser-build#40715 (closed)

• Backport Timeline

  • Immediate - patchsets for critical bug fixes or other major blocker (e.g. fixes for a 0-day exploit) OR patchsets with trivial changes which do not need testing (e.g. fixes for typos or fixes easily verified in a local developer build)
  • Next Minor Stable Release - patchset that needs to be verified in nightly before backport
  • Eventually - patchset that needs to be verified in alpha before backport
  • No Backport - patchset for the next major stable

• Upstream Merging

  • Merge to base-browser - typically for !fixups to patches in the base-browser branch, though sometimes new patches as well
    • NOTE: if your changeset includes patches to both base-browser and tor-browser please please make separate merge requests for each part

• Issue Tracking

  • Link resolved issues with appropriate Release Prep issue for changelog generation

Change Description

Not quite as clean as the stable series. The diff of diffs is clean apart from re-adding a missing rv error return check that was missed in the relative data directory patch set ( @pierov in toolkit/xre/nsAppRunner.cpp ).

range-diff: git range-diff FIREFOX_102_6_0esr_BUILD1..origin-push/tor-browser-102.6.0esr-12.5-1 FIREFOX_102_7_0esr_BUILD1..richard/bug_40715