Why doesn't the browser display the ftp page?

Question

Browsers

Hello.
There is a very incomprehensible problem. I have an ftp server, it works fine, you can go to it like this ftp://[email protected] and just like that only with my real external ip. Works great in all browsers. But the essence of the problem is that I decided to display the FTP page on my site and it turns out that it works fine in the edge browser and mozila 52.4 of the old version. But in other browsers nothing! All other browsers are mozilla, opera, chrome, yandex latest versions and the page with ftp is not displayed there.
In the code of the site, I display it like this

<div class="text-center">
                    <h1>Страница FTP сервера</h1>
                    <iframe src="ftp://[email protected]/" width="900" height="4400" frameborder="no">
                        Данный текст будет показан, если браузер не поддерживает фреймы.
                    </iframe>
                </div>

Why is the FTP page not displayed on the site in the latest versions of browsers? And so there is to insert a link into the address bar of the browser, then everything works!

Answer 1

In general, I will answer my own question. Yesterday I dealt with this issue and found a couple of articles. You can google for this query. Firefox, following Chrome, blocks the download of most FTP sub-resources here
is the link _ https://www.securitylab.ru/news/492553.php
now there is no way to display ftp on the page of your site, before there were no problems with this.
As they say, everything is for the people.