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Youtube Speed Control With + and -

Increases the playback speed when the + key on the numpad is pressed, and decreases when the - key is pressed

As of 2016-10-24. See the latest version.

// ==UserScript==
// @name        Youtube Speed Control With + and -
// @namespace   YoutubeSpeedPlusMinus
// @description Increases the playback speed when the + key on the numpad is pressed, and decreases when the - key is pressed
// @include     https://www.youtube.com/*
// @version     1.0.2
// @grant       none
// ==/UserScript==

document.onkeydown = function(evt) {
	var keyboardEvent = document.createEvent("KeyboardEvent");
	var initMethod = typeof keyboardEvent.initKeyboardEvent !== 'undefined' ? "initKeyboardEvent" : "initKeyEvent";
	
	switch (evt.keyCode) {
		case 107:
			//console.log("speed up")
			keyboardEvent[initMethod]("keydown", true, true, window, false, false, true, false, 190, 0);
			document.dispatchEvent(keyboardEvent);
			break;
		case 109:
			//console.log("speed down")
			keyboardEvent[initMethod]("keydown", true, true, window, false, false, true, false, 188, 0);
			document.dispatchEvent(keyboardEvent);
			break;
	}
};