Comment 38 for bug 1853007

I also see a large number of ns* temporary files that Thunderbird leaves behind in `/tmp/`. This is quite annoying.

I've currently got almost 1000 ns* files there:
```
/tmp/nsemail-328.eml /tmp/nsemail-622.eml /tmp/nsmail-2.pdf
/tmp/nsemail-329.eml /tmp/nsemail-623.eml /tmp/nsmail-2.png
/tmp/nsemail-32.eml /tmp/nsemail-624.eml /tmp/nsmail-2.tmp
/tmp/nsemail-330.eml /tmp/nsemail-625.eml /tmp/nsmail-30.tmp
/tmp/nsemail-331.eml /tmp/nsemail-626.eml /tmp/nsmail-31.tmp
/tmp/nsemail-332.eml /tmp/nsemail-627.eml /tmp/nsmail-32.tmp
/tmp/nsemail-333.eml /tmp/nsemail-628.eml /tmp/nsmail-33.tmp
/tmp/nsemail-334.eml /tmp/nsemail-629.eml /tmp/nsmail-34.tmp
/tmp/nsemail-335.eml /tmp/nsemail-62.eml /tmp/nsmail-3.eml
/tmp/nsemail-336.eml /tmp/nsemail-630.eml /tmp/nsmail-3.jpeg
/tmp/nsemail-337.eml /tmp/nsemail-631.eml /tmp/nsmail-3.pdf
/tmp/nsemail-338.eml /tmp/nsemail-632.eml /tmp/nsmail-3.tmp
/tmp/nsemail-339.eml /tmp/nsemail-633.eml /tmp/nsmail-4.eml
/tmp/nsemail-33.eml /tmp/nsemail-634.eml /tmp/nsmail-4.jpeg
/tmp/nsemail-340.eml /tmp/nsemail-635.eml /tmp/nsmail-4.pdf
/tmp/nsemail-341.eml /tmp/nsemail-636.eml /tmp/nsmail-4.tmp
/tmp/nsemail-342.eml /tmp/nsemail-637.eml /tmp/nsmail-5.eml
/tmp/nsemail-343.eml /tmp/nsemail-638.eml /tmp/nsmail-5.jpeg
/tmp/nsemail-344.eml /tmp/nsemail-639.eml /tmp/nsmail-5.pdf
/tmp/nsemail-345.eml /tmp/nsemail-63.eml /tmp/nsmail-5.tmp
/tmp/nsemail-346.eml /tmp/nsemail-640.eml /tmp/nsmail-6.eml
/tmp/nsemail-347.eml /tmp/nsemail-641.eml /tmp/nsmail-6.jpeg
/tmp/nsemail-348.eml /tmp/nsemail-642.eml /tmp/nsmail-6.pdf
/tmp/nsemail-349.eml /tmp/nsemail-643.eml /tmp/nsmail-6.tmp
/tmp/nsemail-34.eml /tmp/nsemail-644.eml /tmp/nsmail-7.jpeg
/tmp/nsemail-350.eml /tmp/nsemail-645.eml /tmp/nsmail-7.pdf
/tmp/nsemail-351.eml /tmp/nsemail-646.eml /tmp/nsmail-7.tmp
/tmp/nsemail-352.eml /tmp/nsemail-647.eml /tmp/nsmail-8.pdf
/tmp/nsemail-353.eml /tmp/nsemail-648.eml /tmp/nsmail-8.tmp
/tmp/nsemail-354.eml /tmp/nsemail-649.eml /tmp/nsmail-9.pdf
/tmp/nsemail-355.eml /tmp/nsemail-64.eml /tmp/nsmail-9.tmp
/tmp/nsemail-356.eml /tmp/nsemail-650.eml /tmp/nsmail.asc
/tmp/nsemail-357.eml /tmp/nsemail-651.eml /tmp/nsmail.docx
/tmp/nsemail-358.eml /tmp/nsemail-652.eml /tmp/nsmail.eml
/tmp/nsemail-359.eml /tmp/nsemail-653.eml /tmp/nsmail.ics
/tmp/nsemail-35.eml /tmp/nsemail-654.eml /tmp/nsmail.jpeg
/tmp/nsemail-360.eml /tmp/nsemail-655.eml /tmp/nsmail.odt
/tmp/nsemail-361.eml /tmp/nsemail-656.eml /tmp/nsmail.pdf
/tmp/nsemail-362.eml /tmp/nsemail-657.eml /tmp/nsmail.png
/tmp/nsemail-363.eml /tmp/nsemail-658.eml /tmp/nsmail.tmp
/tmp/nsemail-364.eml /tmp/nsemail-659.eml /tmp/nsmail.zip
/tmp/nsemail-365.eml /tmp/nsemail-65.eml
```
This is just an excerpt. There are many more, total 989 files. And that although I've had already cleaned them up relatively recently already.