firefox-arguments-bug.js

// Latest Firefox (including nightly):

// INCORRECT with FDs

(function () {
  
  // a function declaration
  // does not replace arguments object
  function arguments() {}
  alert(arguments); // "[object Object]", should be function

  // nor even if to assign a new value then
  arguments = 10;
  alert(arguments); // "[object Object]", should be 10
  
})(1);

// CORRECT with vars

// However, if we have a variable declaration
// with later assignment, it's OK

(function () {
  
  // a variable declaration
  // correctly does not disturb
  // arguments object
  var arguments;
  alert(arguments); // OK, "[object Object]"

  // and its assignment again correctly does
  arguments = 10;
  alert(arguments); // 10
  
})(1);