[Bug 1959604]

[Mkmelin+mozilla]

Please grab this one for 91: https://hg.mozilla.org/try-comm-
central/rev/cd62aeb78d449ab78f05db634320ae06f33de437

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https://bugs.launchpad.net/bugs/1959604

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

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