/usr/lib/haskell-packages/extra-packages/js-flot-0.8.3 is in libghc-js-flot-dev 0.8.3-6build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
libghc-js-flot-data (>= 0.8.3)