Tampermonkey script

// ==UserScript==
// @name         Click on Search Input Field and Select Subreddit
// @namespace    http://tampermonkey.net/
// @version      1.2
// @description  Clicks on the search input field, opens the dropdown, and selects the subreddit link, retrying if the search input is not found immediately
// @author       Paradox109
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Define the subreddit name as a variable
    const subredditName = 'LivestreamFail';

    // Check if the current page URL matches the desired URL
    if (window.location.href !== 'https://new.reddit.com/message/messages') {
        console.log('Not on the correct page, exiting script.');
        return;  // Exit the script if not on the correct page
    }

    let retryInterval;  // Variable to hold the interval ID

    // Function to click on the search input field
    function clickSearchInput() {
        const searchInput = document.querySelector('.h-jI8r2f9ozTNqu_2TBeY');

        if (searchInput) {
            searchInput.focus();  // Focus the input field
            searchInput.click();  // Click the input field
            console.log('Search input field clicked.');

            // Stop retrying and perform actions after opening the dropdown
            clearInterval(retryInterval);
            openDropdownMenu();
        } else {
            console.log('Search input field not found, retrying...');
        }
    }

    // Function to click on the dropdown menu and wait for it to appear
    function openDropdownMenu() {
        const dropdownButton = document.querySelector('button.h-jI8r2f9ozTNqu_2TBeY');

        if (dropdownButton) {
            dropdownButton.click();  // Click the dropdown button
            console.log('Dropdown menu clicked.');

            // Wait for the dropdown menu to appear and then select the subreddit link
            waitForDropdownToAppear();
        } else {
            console.log('Dropdown button not found.');
        }
    }

    // Function to wait for the dropdown menu to appear and then click the subreddit link
    function waitForDropdownToAppear() {
        const observer = new MutationObserver((mutationsList) => {
            for (const mutation of mutationsList) {
                if (mutation.type === 'childList') {
                    const menu = document.querySelector('[role="menu"]');
                    if (menu) {
                        console.log('Dropdown menu appeared.');

                        // Look for the subreddit link and click it
                        const subredditLink = menu.querySelector(`a[href="/r/${subredditName}/"]`);
                        if (subredditLink) {
                            subredditLink.click();  // Click the subreddit link
                            console.log(`r/${subredditName} link clicked.`);
                            observer.disconnect();  // Stop observing after the action is done
                            clearInterval(retryInterval);  // Stop retrying
                        } else {
                            console.log(`Subreddit link for r/${subredditName} not found.`);
                        }
                    }
                }
            }
        });

        // Start observing for changes in the document body
        observer.observe(document.body, { childList: true, subtree: true });
    }

    // Function to start the retry loop for clicking the search input field
    function startRetryLoop() {
        retryInterval = setInterval(clickSearchInput, 100);  // Retry every 1 second
    }

    // Wait for the page to load completely before executing the script
    window.addEventListener('load', function() {
        // Start the retry loop after the page has loaded
        startRetryLoop();
    });

})();