Injects ChoicescriptIDE/ChoiceScriptSavePlugin into any CoG games. https://www.reddit.com/r/choiceofgames/comments/ovo3eh/choicescriptsaveplugininjector_add_save_system_to/

ChoiceScriptSavePluginInjector.user.js

/**
 * ChoiceScriptSavePluginInjector
 *
 * ---
 *
 * Licensed under the MIT License.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * ---
 *
 * ChoiceScriptSavePlugin by CJW (ChoiceScriptIDE):
 * https://github.com/ChoicescriptIDE/ChoiceScriptSavePlugin,
 * https://forum.choiceofgames.com/t/choicescript-saving-plugin-update-sept-2019/983
 *
 */

// ==UserScript==
// @name         ChoiceScriptSavePluginInjector
// @author       AbrahamAriel
// @description  Injects ChoicescriptIDE/ChoiceScriptSavePlugin into any CoG games.
// @version      1.8.1
// @license      MIT
// @namespace    https://gist.github.com/AbrahamAriel/7a8d7cea1d8cbcd82700d67a09942a47
// @downloadURL  https://gist.githubusercontent.com/AbrahamAriel/7a8d7cea1d8cbcd82700d67a09942a47/raw/ChoiceScriptSavePluginInjector.user.js
// @updateURL    https://gist.githubusercontent.com/AbrahamAriel/7a8d7cea1d8cbcd82700d67a09942a47/raw/ChoiceScriptSavePluginInjector.user.js
// @homepage     https://www.reddit.com/r/choiceofgames/comments/ovo3eh/choicescriptsaveplugininjector_add_save_system_to/
// @match        http://choiceofgames.com/*
// @match        https://choiceofgames.com/*
// @match        http://www.choiceofgames.com/*
// @match        https://www.choiceofgames.com/*
// @match        http://choiceofgames.com/user-contributed/*
// @match        https://choiceofgames.com/user-contributed/*
// @match        http://www.choiceofgames.com/user-contributed/*
// @match        https://www.choiceofgames.com/user-contributed/*
// @exclude      http://www.choiceofgames.com/category/*
// @exclude      https://www.choiceofgames.com/category/*
// @exclude      http://www.choiceofgames.com/profile/*
// @exclude      https://www.choiceofgames.com/profile/*
// @exclude      http://www.choiceofgames.com/blog/*
// @exclude      https://www.choiceofgames.com/blog/*
// @exclude      http://www.choiceofgames.com/api/*
// @exclude      https://www.choiceofgames.com/api/*
// @exclude      http://www.choiceofgames.com/about-us/*
// @exclude      https://www.choiceofgames.com/about-us/*
// @exclude      http://www.choiceofgames.com/contact-us/*
// @exclude      https://www.choiceofgames.com/contact-us/*
// @exclude      http://www.choiceofgames.com/privacy-policy/*
// @exclude      https://www.choiceofgames.com/privacy-policy/*
// @exclude      http://www.choiceofgames.com/looking-for-writers/*
// @exclude      https://www.choiceofgames.com/looking-for-writers/*
// @exclude      http://www.choiceofgames.com/make-your-own-games/*
// @exclude      https://www.choiceofgames.com/make-your-own-games/*
// @exclude      http://choiceofgames.com/category/*
// @exclude      https://choiceofgames.com/category/*
// @exclude      http://choiceofgames.com/profile/*
// @exclude      https://choiceofgames.com/profile/*
// @exclude      http://choiceofgames.com/blog/*
// @exclude      https://choiceofgames.com/blog/*
// @exclude      http://choiceofgames.com/api/*
// @exclude      https://choiceofgames.com/api/*
// @exclude      http://choiceofgames.com/about-us/*
// @exclude      https://choiceofgames.com/about-us/*
// @exclude      http://choiceofgames.com/contact-us/*
// @exclude      https://choiceofgames.com/contact-us/*
// @exclude      http://choiceofgames.com/privacy-policy/*
// @exclude      https://choiceofgames.com/privacy-policy/*
// @exclude      http://choiceofgames.com/looking-for-writers/*
// @exclude      https://choiceofgames.com/looking-for-writers/*
// @exclude      http://choiceofgames.com/make-your-own-games/*
// @exclude      https://choiceofgames.com/make-your-own-games/*
// @run-at       document-start
// @grant        GM_getResourceText
// @resource     ChoiceScriptSavePlugin https://cdn.jsdelivr.net/gh/AbrahamAriel/ChoiceScriptSavePlugin@latest/ChoiceScriptSavePlugin.js
// ==/UserScript==

(function() {
    'use strict';

    const savePluginElement = Object.assign(document.createElement('script'), {
        type: 'text/javascript',
        innerHTML: GM_getResourceText('ChoiceScriptSavePlugin')
    });

    const navigatorScript = /(navigator\.js)/;
    const mygame = /(mygame\.js)/;

    const navigatorObserver = new MutationObserver(function (records) {
        records.forEach(function (mutation) {
            Array.prototype.forEach.call(mutation.addedNodes, function (node) {
                if ("SCRIPT" === node.tagName) {
                    if (navigatorScript.test(node.src)) {
                        try {
                            node.after(savePluginElement);
                            navigatorObserver.disconnect();
                        } catch (error) {
                            console.error('Failed to attach quick save menu!', error);
                        }
                    }
                }
            });
        });
    });

    navigatorObserver.observe(document.head, {
        subtree: true,
        childList: true,
        attributes: true,
        attributesFilter: ['src'],
        characterData: false,
    });

    document.addEventListener("DOMContentLoaded", (event) => {
        /** Stops MutationObserver after 5 seconds
         * To prevent it from hogging unnecessary
         * resources.
         */

        setTimeout(() => {
            console.log('disconnect');
            navigatorObserver.disconnect();
        }, 5000);
    });
})();