Userscript to hide the Crunchyroll Thumbnails at the bottom of the player which may contain spoilers.

hide-crunchyroll-thumbnails.user.js

// ==UserScript==
// @name        Hide Crunchyroll Thumbnails
// @namespace   https://imcpwn.com
// @description Hide the Crunchyroll Thumbnails at the bottom of the player which may contain spoilers.
// @version     1.0.0
// @author      Carleton Stuberg
// @copyright   2016+, Carleton Stuberg
// @license     MIT; http://opensource.org/licenses/MIT
// @include     http://www.crunchyroll.com/*
// @run-at      document-end
// @grant       none
// ==/UserScript==

//==[ History ]======================================================
// 1.0.0 - Initial release.
//===================================================================

//-------------------------------------------------------------------
// main() - Runs after page is done loading.
//-------------------------------------------------------------------
function main() {
    // Clear the src (image) of all items wil class ".mug" (should just be the thumbnails).
    for (let thumb of document.querySelectorAll('.mug')) thumb.src = '';
}

//-------------------------------------------------------------------
// Run main() upon load.
//-------------------------------------------------------------------
if (document.readyState === 'complete')
    main();
else
    window.addEventListener("load", main, false);

nice thanks!!!