JavaScript: prototype functions showing up in console

Question

I just noticed that when I log an instance of the object I'm currently working on I see the prototype functions after it's property ( it only has one ). Which makes me think I'm doing something wrong.

This is how I'm setting the prototype.

MF = function(x){
    if(!(this instanceof MF)) return new MF(x);
    this.node = x;
}
MF.prototype = {
    show: function(display){
        display ? this.node.style.display = display : this.node.style.display = 'block';
    },
    hide: function(){
        this.node.style.display = 'none';
    }
}

console.log(MF(window));

I also tried setting it with Object.create(), as suggested in this answer, which doesn't make much sense in my case but desperate times call for desperate attempts.

Why am I seeing the prototype methods in the instance, and how can I fix this?

EDIT:

For example here's how a jQuery object looks like, no prototype functions shown in the log

Answer 1

There doesn't appear anything wrong with your code. I'm sure the prototype properties are only listed as a convenience when there are only a few instance properties. Expanding the logged object reveals that all properties are where they are supposed to be.