Comment 17 for bug 1853007

Sorry about the double, I thought I was editing the message so you'd know the files were all created after I had deleted the ones in the original post.
The four nsmail*.tmp files are all copies of the same jpg image that I sent in one message as a lone attachment. In examining the other files, I noticed that I need to change my habit of replying to a recent message, then changing the subject and deleting the old content to create a new message, suffering from congenital indolence as I oftentimes do. I found huge reference lists of previous threads in the header. I was under the impression that a new Subject meant a new message. Apparently you can change the subject in any reply and it remains a reply to the previous message. Perhaps it is that habit that leaves behind the /tmp files?
The nscopy files are all the same message in text and html format with the attached image in mime format.
I cleared ns*, opened t-bird, sent myself a test message, then closed t-bird. These four are all from that message, in both txt and html format.
nscopy.tmp
nsemail.eml
nsemail.html
nsmail.tmp

I download the latest tarball, extract the Thunderbird folder, then move it to /usr/lib64. Would installing via a package manager change the result?