// ==UserScript==
// @name        YouTube Unbind Space
// @namespace   http://forum.ru-board.com/topic.cgi?forum=5&topic=50225&start=420#20 [?]
// @description Unbinds space to prevent video pause when you hit space to scroll page.
// @include      http*://*.youtube.com/*
// @include      http*://youtube.com/*
// @include      http*://*.youtu.be/*
// @include      http*://youtu.be/*
// @version     1.0
// @grant        none
// @run-at       document-end
// ==/UserScript==

['keydown', 'keyup'].forEach((eventName) => {
  window.addEventListener(
    eventName,
    (e) => {
         if(e.keyCode == 32)
         {
            e.stopPropagation();
         }
    },
    true // capturing phase - very important
  );
});