gistfile1.txt

// ==UserScript==
// @name         Chatgpt enable left click highlight
// @namespace    chatgpt
// @version      1.0
// @description  Re-enable text selection and copying
// @author       s2k
// @match        https://chatgpt.com/*
// @grant        none
// @run-at       document-idle
// ==/UserScript==

(function() {
    'use strict';
    try {
        if (document.getElementById('enable-select-style')) { alert('EnableSelect already applied'); return; }
        var s = document.createElement('style');
        s.id = 'enable-select-style';
        s.textContent = '*{user-select:text!important;-webkit-user-select:text!important;-moz-user-select:text!important;-ms-user-select:text!important;-webkit-touch-callout:default!important} ::selection{background:rgba(180,200,255,0.6)!important}';
        document.head.appendChild(s);
    } catch (e) {}
    function recurse(root) {
        try {
            var nodes = (root.shadowRoot ? root.shadowRoot : root).querySelectorAll('*');
            for (var i = 0; i < nodes.length; i++) {
                var el = nodes[i];
                try {
                    el.onselectstart = null;
                    el.onmousedown = null;
                    el.onmouseup = null;
                    el.style && (el.style.userSelect = 'text');
                    el.style && (el.style.webkitUserSelect = 'text');
                } catch (e) {}
                if (el.shadowRoot) recurse(el);
            }
        } catch (e) {}
    }
    recurse(document);
    Array.from(document.querySelectorAll('body *')).forEach(function(el) {
        try {
            var cs = getComputedStyle(el);
            var r = el.getBoundingClientRect();
            var z = parseInt(cs.zIndex) || 0;
            if (z >= 1000 && r.width >= window.innerWidth * 0.9 && r.height >= window.innerHeight * 0.9 && cs.pointerEvents !== 'none') {
                el.style.pointerEvents = 'none';
                el.style.userSelect = 'text';
            }
        } catch (e) {}
    });
})();