Auto switch to "Following" tab on X/Twitter using MutationObserver for GreaseMonkey. Generated code.

gistfile1.txt

// ==UserScript==
// @name         Twitter(X): Select the Following tab on load (using MutationObserver)
// @match        https://x.com/*
// @match        https://twitter.com/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

(function() {
    'use strict';

    let hasAutoClicked = false;
    let lastPathname = window.location.pathname;

    const selectFollowingTab = () => {
        // 1. Check if we are on Home
        if (window.location.pathname !== '/home') {
            hasAutoClicked = false; // Reset if we leave home
            return;
        }

        // 2. If we already auto-clicked during this specific visit to /home, stop.
        if (hasAutoClicked) return;

        const tabs = document.querySelectorAll('div[role="tab"]');

        if (tabs.length >= 2) {
            const followingTab = tabs[1];
            const isSelected = followingTab.getAttribute('aria-selected') === 'true';

            if (!isSelected) {
                followingTab.click();
                hasAutoClicked = true; // Mark as done so user can manual click "For You"
            } else {
                // If it was already "Following" by default, mark as done anyway
                hasAutoClicked = true;
            }
        }
    };

    // Watch for both DOM changes (loading) and URL changes (navigation)
    const observer = new MutationObserver(() => {
        // If the URL changed (e.g., user clicked from Profile to Home)
        if (window.location.pathname !== lastPathname) {
            lastPathname = window.location.pathname;
            hasAutoClicked = false; // Reset the lock for the new page
        }

        selectFollowingTab();
    });

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

    // Initial run
    selectFollowingTab();
})();