Zend certified PHP/Magento developer

How to prevent users from installing new Chrome extensions

I am trying to prevent users from installing new extensions on Chrome. I have tried the registry method outlined in this website, but the problem I am having is that it deletes previous extensions, which I would like to prevent. I have tried searching for other answers, but they almost all outline a method for preventing all installations.

Is there a way to block only new extension installations and keep old ones?

Thank you.