Greasemonkey - disable FB scroll

// ==UserScript==
// @name     Stop Facebook Scroll TM
// @include  https://facebook.com/*
// @include  https://www.facebook.com/*
// @exclude  https://facebook.com/messages/*
// @exclude  https://www.facebook.com/messages/*
// @grant    GM_addStyle
// ==/UserScript==

GM_addStyle ("body { overflow: hidden !important; }");
document.addEventListener('keydown', function(e) {
    if (e.keyCode == 38 || e.keyCode == 40 || e.keyCode == 33 || e.keyCode == 34 || e.keyCode == 35 || e.keyCode == 36 || e.keyCode == 32) {
        e.stopImmediatePropagation();
        e.preventDefault();
        e.defaultPrevented = true;
        return true;
    }
    return false;
});
// can't disable space and mousewheel crosshair