At the moment both the official “Portable Builds” at https://www.fosshub.com/JabRef.html and “nightly builds” at https://builds.jabref.org/master/, only contain a directory called “JabRef”.
Naturally, when testing how JabRef works, it is necessary to check at least two versions, the latest stable, and the latest nightly. And it is usually natural to download them into the same directory, say /tmp/DeleteOnReboot
Since the directory packed into the “nightly” tar.gz, and the one packed into the “release” tar.gz are called the same, they overwrite each other after extraction.
I would like to ask that they are named differently so that the extracted archives don’t clash.