browser.tabs.onActivated.addListener((activeInfo) => {
    browser.tabs.executeScript(tabId, {
        code: 'document.documentElement.outerHTML'
    }).then(result => {
        const html = result[0];
        fetch('http://localhost:3000/notify', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({ html })
        }).catch(err => {
            console.error('Error sending HTML:', err);
        });
    }).catch(err => {
        console.error('Error fetching HTML:', err);
    });
});