This script enables Gemini temporary chat by default on page load

geminiTempDefault.js

// ==UserScript==
// @name         Gemini - Temporary Chat by default
// @namespace    https://github.com/joeperpetua
// @version      2026-02-25
// @description  Enables Gemini temporary chat by default
// @author       joeperpetua
// @match        https://gemini.google.com/app
// @icon         https://www.google.com/s2/favicons?sz=64&domain=google.com
// @grant        none
// ==/UserScript==

const sleep = async (ms) => new Promise(resolve => setTimeout(resolve, ms));


(function() {
    'use strict';
    let running = false;
    const observer = new MutationObserver(() => run());

    /////////////////////////////////////////////////////////////////////////////
    // If the script is failing due to slow connection or slow initialization, //
    // increase sleepTime to a bigger number.                                  //
    /////////////////////////////////////////////////////////////////////////////
    const sleepTime = 1500;

    observer.observe(document.body, {
        subtree: true,
        childList: true,
        attributes: false,
    });

    async function run() {
        if (running) return
        running = true;

        const button = document.querySelector("[data-test-id='temp-chat-button']");
        if (!button) {
            running = false;
            return;
        }

        console.log('[UserScript] Custom script [Gemini - Temporary Chat by default] is running...')
        await sleep(sleepTime);
        button.click();

        observer.disconnect();
        console.log('[UserScript] Custom script [Gemini - Temporary Chat by default] has been executed.')
        return
    }
})();