chatgpt-prevent-zoom.user.js

// ==UserScript==
// @name         Do not zoom when focus to input
// @namespace    net.mizle
// @version      1.0
// @description  Continuously update viewport settings every second
// @author       Eai
// @match        https://chat.openai.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    setInterval(function() {
        var viewportMeta = document.querySelector('meta[name="viewport"]');
        if (viewportMeta) {
            viewportMeta.setAttribute('content', 'width=device-width, initial-scale=1, maximum-scale=1');
        }
    }, 1000);
})();