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    <p>Facts (credits go to @IHateLazy): </p> <p><code>aspenProto.constructor</code> is <code>Mammal</code>. This is because the <code>constructor</code> is actually an attribute of Mammal.prototype, set at the method creation time. <code>Canine.prototype.constructor</code> is not <code>Canine</code>, since the prototype (holding the <code>constructor</code> property) was overwritten by <code>new Mammal()</code>.</p> <p>Tests:</p> <pre><code>aspen.constructor = function Hello(){}; // aspen is Hello in Firebug, // Dog in Chrome aspen.constructor.name = "test" // still Hello in Firebug, // name is also Hello in both aspen.constructor = function(){}; // aspen is Object in Firebug aspen.constructor.name = "test" // still Object in Firebug aspen.constructor = null; // still Object and Dog ({constructor: function Hello(){}}) // Hello in Firebug AND Chrome ({constructor: function (){}}) // Object in both (not surprisingly) ({constructor:{name:"Hi"}}) // "Object" in FB, "Hi" in Chrome x={constructor:function(){}) x.constructor.name="Hello" // x is Object in both x=new Object() x.constructor=function Hello(){} // x is Hello in both new (function(){})() // Object in both new (function(){ this.constructor=function Hello(){} })() // Hello in both </code></pre> <p>Conclusion:</p> <p>Firebug always relies on the object's own <code>constructor</code> property to name it. If the <code>constructor</code> is a named function, it uses the <code>constructor</code> <code>name</code> (which is not writable - thanks @IHateLazy). If the <code>constructor</code> property is an anonymous function or not a function at all, then Firebug uses <code>"Object"</code> instead.</p> <p>Chrome holds each object's actual constructor as an internal property. <em>Only</em> if that property is not accessible (the object was not constructed) or is Object, it looks at the object's <code>constructor</code> property. If the constructor is a named function, it uses its internally stored name. If the constructor is not a function or is anonymous it uses the <code>name</code> property.</p>
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    1. CO+1 for a heck of a lot of digging and testing. You probably know this, but in browsers that support the *(non-standard)* `.name` property on functions, it's usually not writeable, so the `aspen.constructor.name = "test"` would have no effect. Trouble with console questions is that everything could change with the next release, so I usually avoid these. Glad you took care of it! ;-)
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    2. CO@IHateLazy You are right - it's not writable. Should have checked.
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    3. COwow... How many edge cases will I find? I haven't checked if the Chrome's internal constructor property is visible across frames and windows.
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