DownloadInATextFormat.js

// ==UserScript==
// @name         Download in a text file
// @namespace    https://www.youtube.com/user/surajitbasak109
// @version      1
// @description  This script downloads webpage in a text file
// @author       Surajit Basak
// @match        http*://*/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var a = document.createElement('a');
    document.body.appendChild(a);
    a.textContent = 'Download in a text format';
    a.setAttribute('style', 'position: fixed; top: 0px; right: 0px; border-radius: 15px; width: 300px; padding: 10px 12px; background-color: darkred; color: white; z-index: 99999');
    var blob = new Blob([document.body.innerText], {type: 'text/plain'});
    var url = window.URL.createObjectURL(blob);
    a.href = url;
    a.download = document.title + '.txt';
})();