codeschoolfix.console.js

// ==UserScript==
// @name           monkeybusiness-codeschool
// @namespace  https://github.com/johnelliott/monkeybusiness
// @include   http://*.codeschool.com/*
// ==/UserScript==

// this is not actually a UserScript. because `getEventListeners` only exists in the dev-consoles.
// so copy paste this content in rather than actually running it as a userscript

// the capability not actually in HTML.
// gee it sure would be great if the Document Object Model could tell you about itself but it's EventTargets cannot.
// seems a pretty basic part of what the DOM is supposed to be about- giving you an object model
// to tell you what you are dealing with, what you are looking at or hearing
var n = getEventListeners(document.body).keyup;

console.log("do we have an n?", n);

function guardedKeyupListener(e) {
    if ((e.keyCode === 75 || e.keyCode === 74) && e.ctrlKey) {
        console.log("return?");
        return;
    }
    console.log("listener call");
    n[0].listener.call(this, e);
}

// get rid of old event listener
document.body.removeEventListener("keyup", n[0].listener);
// put listener back and see if it the right key to pass through
document.body.addEventListener("keyup", guardedKeyupListener);