/usr/include/mozjs-24/mozilla/ is in libmozjs-24-dev 24.2.0-3ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mozjs-24/mozilla/Assertions.h
/usr/include/mozjs-24/mozilla/Atomics.h
/usr/include/mozjs-24/mozilla/Attributes.h
/usr/include/mozjs-24/mozilla/BloomFilter.h
/usr/include/mozjs-24/mozilla/Casting.h
/usr/include/mozjs-24/mozilla/Char16.h
/usr/include/mozjs-24/mozilla/CheckedInt.h
/usr/include/mozjs-24/mozilla/Compiler.h
/usr/include/mozjs-24/mozilla/Constants.h
/usr/include/mozjs-24/mozilla/DebugOnly.h
/usr/include/mozjs-24/mozilla/Decimal.h
/usr/include/mozjs-24/mozilla/Endian.h
/usr/include/mozjs-24/mozilla/EnumSet.h
/usr/include/mozjs-24/mozilla/FloatingPoint.h
/usr/include/mozjs-24/mozilla/GuardObjects.h
/usr/include/mozjs-24/mozilla/HashFunctions.h
/usr/include/mozjs-24/mozilla/Likely.h
/usr/include/mozjs-24/mozilla/LinkedList.h
/usr/include/mozjs-24/mozilla/MSStdInt.h
/usr/include/mozjs-24/mozilla/MathAlgorithms.h
/usr/include/mozjs-24/mozilla/MemoryChecking.h
/usr/include/mozjs-24/mozilla/NullPtr.h
/usr/include/mozjs-24/mozilla/PodOperations.h
/usr/include/mozjs-24/mozilla/Poison.h
/usr/include/mozjs-24/mozilla/Range.h
/usr/include/mozjs-24/mozilla/RangedPtr.h
/usr/include/mozjs-24/mozilla/RefPtr.h
/usr/include/mozjs-24/mozilla/SHA1.h
/usr/include/mozjs-24/mozilla/Scoped.h
/usr/include/mozjs-24/mozilla/SplayTree.h
/usr/include/mozjs-24/mozilla/StandardInteger.h
/usr/include/mozjs-24/mozilla/ThreadLocal.h
/usr/include/mozjs-24/mozilla/TypeTraits.h
/usr/include/mozjs-24/mozilla/TypedEnum.h
/usr/include/mozjs-24/mozilla/Types.h
/usr/include/mozjs-24/mozilla/Util.h
/usr/include/mozjs-24/mozilla/WeakPtr.h