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sanson222 / ZScript for TMO ContextMenu

// ==UserScript==
// @name         ZScript for TMO ContextMenu
// @namespace    http://tampermonkey.net/
// @version      0.0.4
// @description  Enable Context Menu for the web site
// @author       Zearch
// @match        https://tmofans.com/viewer/*/*
// @grant        none
// @license         MIT
// @updateURL https://openuserjs.org/meta/sanson222/ZScript_for_TMO_ContextMenu.meta.js
// @copyright 2019, sanson222 (https://openuserjs.org/users/sanson222)
// ==/UserScript==

var canvasCollection = document.getElementById('viewer-container').childNodes;
    var canvasCollectionArr = [].slice.call(canvasCollection);

    var filteredCollection = canvasCollectionArr.filter(function(i) {
        if (i.nodeName === '#text') {
            return false;
        }
        return true;
    });

    var mappedCollection = filteredCollection.map(function(el){ return el.childNodes[1];});

    mappedCollection.forEach(function(el) {
        el.setAttribute('oncontextmenu', '');
    });