// Observe mutations in the chat content
        const observer = new MutationObserver(mutationsList => {
            mutationsList.forEach(mutation => {
                mutation.addedNodes.forEach(node => {
                    if (node instanceof HTMLElement && node.classList.contains('message') && node.classList.contains('common')) {
                        // Check if the added node is a common message and from the user "u_u"
                        const nicknameElement = node.querySelector('.nickname');
                        if (nicknameElement && nicknameElement.innerText.trim() === 'u_u') {
                            const messageText = node.innerText.trim();
                            const messageElement = document.createElement('div');
                            messageElement.textContent = messageText;
                            userMessageWindow.appendChild(messageElement);
                            // Hide the user's message in the main chat box
                            node.style.display = 'none';
                        }
                    }
                });
            });
        });