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    <p>I know this post is kind of old, but I've been searching the net for information on this subject and figured I'd post what I found. The prototype property is for constructor functions. It allows you to assign the prototype object of objects you will create with the new keyword.</p> <p>Every object in JavaScript has a prototype object, but many implementations don't give you direct access to it or allow you to set it after object creation. In FireFox, you can access this object via the "<code>__proto__</code>" property.</p> <p>Below I have a version of your code using the "<code>__proto__</code>" property. The section on the Function prototype chain matches what you thought it should have been.</p> <pre><code>function nl(z) { document.write(z + "&lt;br&gt;"); } x = {}; nl(x["__proto__"]); nl(x["__proto__"] === Object.prototype); nl(""); nl(nl.prototype.constructor); nl(nl["__proto__"].constructor); nl(nl["__proto__"] === nl.prototype); nl(""); nl(nl["__proto__"]); nl(nl["__proto__"] === Function.prototype); nl(nl["__proto__"]["__proto__"] === Object.prototype); nl(nl["__proto__"]["__proto__"]["__proto__"]); nl(""); nl(Function["__proto__"]); nl(Function["__proto__"]["__proto__"]); nl(Function["__proto__"]["__proto__"] === Object.prototype); nl(Function["__proto__"]["__proto__"]["__proto__"]); </code></pre> <p>Output in FireFox is:</p> <pre><code>[object Object] true function nl(z) { document.write(z + " "); } function Function() { [native code] } false function () { } true true null function () { } [object Object] true null </code></pre>
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