Delay Third-Party Scripts Until the Visitor Interacts

// Script handles, or fragments of their URL, to delay.
$wpide_delay_scripts = array( 'hotjar', 'tawk', 'intercom', 'crisp', 'facebook', 'connect.facebook.net', 'static.hotjar.com' );
// Seconds after which delayed scripts load anyway (0 = only on interaction).
$wpide_delay_timeout = 8;

add_filter( 'script_loader_tag', function ( $tag, $handle, $src ) use ( $wpide_delay_scripts ) {
    $match = false;

    foreach ( $wpide_delay_scripts as $needle ) {
        if ( $handle === $needle || ( $src && false !== strpos( $src, $needle ) ) ) {
            $match = true;
            break;
        }
    }

    if ( ! $match || ! class_exists( 'WP_HTML_Tag_Processor' ) ) {
        return $tag;
    }

    $tags = new WP_HTML_Tag_Processor( $tag );

    while ( $tags->next_tag( 'script' ) ) {
        $tags->set_attribute( 'type', 'text/wpide-delay' );
    }

    return $tags->get_updated_html();
}, 30, 3 );

add_action( 'wp_footer', function () use ( $wpide_delay_timeout ) {
    ?>
<script>
(function () {
    var done = false, events = ['scroll', 'pointerdown', 'keydown', 'touchstart', 'mousemove'];
    function run() {
        if (done) { return; }
        done = true;
        events.forEach(function (e) { window.removeEventListener(e, run, { passive: true }); });
        var list = Array.prototype.slice.call(document.querySelectorAll('script[type="text/wpide-delay"]'));
        (function next() {
            var old = list.shift();
            if (!old) { return; }
            var s = document.createElement('script');
            Array.prototype.forEach.call(old.attributes, function (a) { if (a.name !== 'type') { s.setAttribute(a.name, a.value); } });
            if (old.src) { s.onload = s.onerror = next; s.async = false; } else { s.text = old.text; }
            old.parentNode.replaceChild(s, old);
            if (!old.src) { next(); }
        })();
    }
    events.forEach(function (e) { window.addEventListener(e, run, { passive: true }); });
    <?php if ( $wpide_delay_timeout > 0 ) : ?>
    setTimeout(run, <?php echo (int) $wpide_delay_timeout * 1000; ?>);
    <?php endif; ?>
})();
</script>
    <?php
}, 999 );