/usr/include/js-17.0/mozilla/ is in libmozjs-17.0-dev 17.0.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/js-17.0/mozilla/Assertions.h
/usr/include/js-17.0/mozilla/Attributes.h
/usr/include/js-17.0/mozilla/BloomFilter.h
/usr/include/js-17.0/mozilla/CheckedInt.h
/usr/include/js-17.0/mozilla/Constants.h
/usr/include/js-17.0/mozilla/FloatingPoint.h
/usr/include/js-17.0/mozilla/GuardObjects.h
/usr/include/js-17.0/mozilla/HashFunctions.h
/usr/include/js-17.0/mozilla/Likely.h
/usr/include/js-17.0/mozilla/LinkedList.h
/usr/include/js-17.0/mozilla/MSStdInt.h
/usr/include/js-17.0/mozilla/MathAlgorithms.h
/usr/include/js-17.0/mozilla/NullPtr.h
/usr/include/js-17.0/mozilla/RangedPtr.h
/usr/include/js-17.0/mozilla/RefPtr.h
/usr/include/js-17.0/mozilla/SHA1.h
/usr/include/js-17.0/mozilla/Scoped.h
/usr/include/js-17.0/mozilla/StandardInteger.h
/usr/include/js-17.0/mozilla/ThreadLocal.h
/usr/include/js-17.0/mozilla/TypeTraits.h
/usr/include/js-17.0/mozilla/Types.h
/usr/include/js-17.0/mozilla/Util.h
/usr/include/js-17.0/mozilla/WeakPtr.h