[Bug 1959604] [NEW] Thunderbird 91.5.0 regression: writes attachments to /tmp readable to everyone

[Pierre Sauter]

Public bug reported:

thunderbird saves opened attachments to /tmp with permissions according
to umask setting. This was fixed a long time ago with a protected folder
/tmp/mozilla_${USER}0 and was still working correctly as of version
78.14.0+build1-0ubuntu0.20.04.2. The recent update to
1:91.5.0+build1-0ubuntu0.20.04.1 reintroduced the bug.

Ubuntu 20.04.3 LTS
Kernel release:    5.13.0-25-generic
Architecture:      x86_64

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Thunderbird 91.5.0 regression: writes attachments to /tmp readable to
  everyone

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