var thread_container = document.getElementById("thread-container");

if(thread_container)
{
    var post_array = thread_container.children;
    var i = 0;
    for (let post of post_array)
    {
        if(post.querySelector(".post-author").innerHTML == "Brock")
        {
            let btn = post.querySelector(".post-header .post-frag-container .post-frag-btn.minus");
            if(!btn.matches(".clicked"))
            {
                i++;
                btn.click();
            }
        }
    }

    if(i > 0)
    {
        console.log("Downfragged " + i + " brock post(s).");
    }
}