ThreadPoolExecutor really only executing amount if tasks given?

Question

In my Main Class I'm calling the Runnable Class Browser multiple times with an URL using blockingQueue.offer(..), which is linked to my

ThreadPoolExecutor pool =
                new ThreadPoolExecutor(5, 10, 60, TimeUnit.SECONDS,
                        blockingQueue, new ThreadPoolExecutor.AbortPolicy());

To see if it's working as desired, I'm caling a loop with

System.out.println("Currently executing threads: "+ pool.getActiveCount());

and I am getting 5 in most cases (except at the beginning when not 5 threads have started yet, which is also fine).

The browser class also has a notification at the beginning, for me to see which URL has been now used. What really grinds my gears is, when I execute the code, I get a notification from all browsers with their URLS, around 60.

My question is, is the ThreadPoolExecutor initiating every task/thread and then putting on hold or freezing? Because I would rather expect 5 browsers notifying their start until one finishes and a new one starts. Is my expectation wrong?

Browser Class:

public class Browser implements Runnable {

public Browser(URL webPage, ArrayList<String> proxyListMain, ArrayList<String> proxyListDetail, String division)
            throws IOException {
        this.webPage = webPage;
        this.proxyListMain = proxyListMain;
        this.proxyListDetail = proxyListDetail;
        this.division = division;
        System.out.println("Browser: " + webPage);
    }

    @Override
    public void run() {...}
...}