set youtube video speed to 1.5x(you can set your own speed) automatically.
// ==UserScript==
// @name auto adjust youtube video speed
// @namespace Violentmonkey Scripts
// @description set youtube video speed to 1.5x(you can set your own speed) automatically.
// @match *://*.youtube.com/*
// @match *://*.bilibili.com/video/*
// @require http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
// @require https://greasyfork.org/scripts/383527-wait-for-key-elements/code/Wait_for_key_elements.js?version=701631
// @grant GM_addStyle
// @version 0.0.3
// ==/UserScript==
waitForKeyElements ("video", function() {
'use strict';
// set your desired play speed here
var rate = 1.7;
document.querySelector('video').onplay=function() {
document.querySelector('video').playbackRate = rate;
}
document.querySelector('video').playbackRate = rate;
});