memory leak facebook

function searchForPosts() {
    var elements = document.querySelectorAll('._5jmm');
    return elements;
}

function isElementInViewport(el) {
    var rect = el.getBoundingClientRect();
    return rect.bottom > 0 &&
        rect.right > 0 &&
        rect.left < (window.innerWidth || document.documentElement.clientWidth) /* or $(window).width() */ &&
        rect.top < (window.innerHeight || document.documentElement.clientHeight) /* or $(window).height() */;
}

function appendToRemove(posts) {
    let found = false;
    let toRemove = [];
    for (let i=0; i<posts.length; i++) {
        if (isElementInViewport(posts[i]) === true) {
            found = true;
        } else {
            if (found === true)
                toRemove.push(posts[i]);
        }
    }
    return toRemove;
}

function removeOutOutOfViewport(toRemove) {
    toRemove.forEach((el) => {
        console.log('Removing element');
        el.innerHTML = '';
    });
}


function clearMemory () {
    console.log('Running');
    posts = searchForPosts();
    postsToRemove = appendToRemove(posts);
    removeOutOutOfViewport(postsToRemove);
}