Adds a context menu option to copy the text fragment URL

tampermonkey-copy-text-fragment-url.user.js

// ==UserScript==
// @name         Copy text fragment URL
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Copies the text fragment URL for you
// @author       Omar Alshaker (@alshakero)
// @include      *
// @grant        GM.setClipboard
// @run-at       context-menu
// ==/UserScript==

(function() {
    'use strict';

    const url = new URL(window.location);
    url.hash = ':~:text=' + document.getSelection();

     GM.setClipboard(url.href);
})();