[Bug 1853007]

[Ludiofines]

i can confirm this behavior in Linux. i am running same version as
reporter on debian unstable (bug 1602759).  i would add that those files
contain copies of sent emails. sometimes spotted even plain text where
the sent email was encrypted. i tried running `thunderbird --verbose`
but it did not help revealing more info. i tried `thunderbird -g` but
thunderbird-dbgsym seems to be missing from debian.

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Title:
  nsemail and nscopy files left in /tmp

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