Theater player default in youtube

set youtube player theater mode when open video

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name            	Theater player default in youtube
// @namespace       	https://greasyfork.org/users/821661
// @match           	https://www.youtube.com/*
// @grant           	none
// @run-at              document-body
// @version         	1.3
// @author          	hdyzen
// @description     	set youtube player theater mode when open video
// @license         	MIT
// ==/UserScript==
'use strict';

window.ytcfg.data_.START_IN_THEATER_MODE = true;