Raw Source
pootz / Youtube Search Filters Expanded 

// ==UserScript==
// @name        Youtube Search Filters Expanded
// @namespace   pootz
// @description When you search on Youtube the filters are expanded
// @include     /(^https?:\/\/www\.|^https?:\/\/)youtube\.com\/results\?.*/
// @version     1.3
// @history     1.3 - fix
// @history     1.2 - youtube update
// @history     1.1 - @updateURL updated
// @require     https://code.jquery.com/jquery-2.1.1.min.js
// @updateURL   https://openuserjs.org/meta/pootz/Youtube_Search_Filters_Expanded.meta.js
// @downloadURL https://openuserjs.org/install/pootz/Youtube_Search_Filters_Expanded.user.js
// @grant       GM_addStyle
// ==/UserScript==

var filters = $("#button[role='button']");
filters.click();