/usr/lib/mime/packages/jabref is in jabref 2.7~beta1+ds-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | text/x-bibtex; /usr/bin/jabref %s; edit=/usr/bin/jabref %s; description="BibTex document"; nametemplate=%s.bib; test=test -n "$DISPLAY"
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