Crash firefox by js-ctypes (run in the scratch pad or the browser console)

crash-with-crashreport.js

(function(){
Components.utils.import('resource://gre/modules/ctypes.jsm');
var library = ctypes.open(ctypes.libraryName('nss3'));
var PR_Free = library.declare(
  'PR_Free',
  ctypes.default_abi,
  ctypes.void_t,
  ctypes.voidptr_t
);
var ptr = new ctypes.voidptr_t(0123);
PR_Free(ptr);
})();

crash-without-crashreport.js

(function() {
Components.utils.import('resource://gre/modules/ctypes.jsm');
var lib = ctypes.open(ctypes.libraryName('msvcr100'));
var free = lib.declare(
  'free',
  ctypes.default_abi,
  ctypes.void_t,
  ctypes.voidptr_t // ptr
);
free(new (new ctypes.PointerType(ctypes.int))(123456789));
})();