How to protect the browser from remote control?

Question

PHP

Even with a remote connection to a computer, how to disable the use of the browser? especially chrome. There is such a feature in some antiviruses that a remote user can open the antivirus, but can no longer manage it. Is it possible to do the same on a browser without third-party programs? Maybe a browser extension.
Let’s just say that we rent a computer class for testing, but we don’t have control over the computers, since the lessors themselves service them, and there is a suspicion that they themselves connect remotely to these computers and help pass the tests. Let them connect, but I want them not to be able to do any actions remotely on the browser.

Answer 1

Something tells me that the set_count_shared function is not known in this file. Try to see if there are any errors

$(document).ready(function(){
    $("#form_data_for_mail").submit(function() { //устанавливаем событие отправки для формы с id=form
            var form_data = $(this).serialize(); //собераем все данные из формы
            $.ajax({
            	type: "POST", //Метод отправки
                url: "/wp-content/send_mail.php", //путь до php фаила отправителя
                data: form_data,
                success: function() {
                   //код в этом блоке выполняется при успешной отправке сообщения
                   alert("Ваше сообщение отправлено!");
                }
                error: function() {
                       alert("Ошибка!");
                }
            });
            return false; //чтобы страница не перезагружалась
    });
});

Answer 2

Any remote administration application (Remmina, TeamViever, VNC, AnyDesk, etc.) has an "out of control" mode, i.e. the remote admin can only see the screen, but cannot take control of the mouse and keyboard.

Answer 3

There are plugins that set a password to open the browser.

Answer 4

given that these are not your PCs - most likely nothing

Answer 5

Disconnect computers from the Internet.
And if you have access to the server for testing via the Internet, then let the Internet go through a router that allows you to access a single ip-shnik (testing server). That is, bring the router to class with you.