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-The `es5` module provides shim layer to a versions of Firefox that do not yet
-implement certain EcmaScript 5 features.
-
-For more information on EcmaScript 5:
-
-* The new APIs are described in the official [ES5 specification][].
-* A good [introduction][] to the new APIs by John Resig.
-* A Google tech talk on [changes to JavaScript][].
-
-**There is no need to `require` this module** since it gets preloaded into
-all sandboxes automatically.
-
-Usage of new ES5 API's is encouraged, but since not everything can be
-provided to all the versions of firefox, there are few things to be aware of:
-
-`Object.freeze`, `Object.seal`, `Object.preventExtensions` does not really
-prevents any mutations. One thing it guarantees though, `Object.isFrozen`,
-`Object.isSealed`, `Object.isExtensible` checks will behave as defined in
-specification.
-
-`Object.defineProperty` is only partially compliant with the specification:
-
-- Non configurable properties will be created as configurable ones.
-
-- Instead of non-writable properties getters and setters will be defined,
-but `Object.getOwnPropertyDescriptor` will still behave as expected
-(will return property descriptor for non-writable property not a getter)
-
-- Defining properties using ES5 functions will break your
-     [custom iterators][] if you have any. Think twice before employing
-     custom iterators, because in most cases you can just make properties
-     non enumerable. If you really need to have a custom iterator, add it
-     after running ES5 functions and don't ignore previous iterators.
-     For example:
-
-         let object = Object.create({}, {
-           myField: { value: 6 }
-         });
-         object.__iterator__ = (function(original) {
-           return function myIterator() {
-             this.__iterator__ = original;
-             for (let key in this) {
-               // your logic here
-             }
-             this.__iterator__ = myIterator;
-           }
-         })(object.__iterator__);
-
-[custom iterators]:https://developer.mozilla.org/en/New_in_JavaScript_1.7#Iterators
-[ES5 specification]:http://www.ecmascript.org/docs/tc39-2009-043.pdf
-[introduction]:http://ejohn.org/blog/ecmascript-5-objects-and-properties/
-[changes to JavaScript]:http://www.youtube.com/watch?v=Kq4FpMe6cRs