body: In this case, it's about Ad Blocker. I've noticed more and more websites blocking their content based on whether their visitors are using this add-on or not.
  
  
  From their point of view, I understand it's their income from these advertisements getting in danger.
  
  
  From the user's point of view, I understand it's not just some annoying advertisement, but sometimes real danger like Trojans or Viruses.
  
  
  Whoever is right however, is not the question. The question is more related to the invasion of privacy.
  
  
  Is a website owner really allowed to know what kind of add-ons or programs I'm using without my permission?
  
  
  Is such an owner not in fact discriminating based on what a user is using on his/her computer? Even so when the programs or add-ons being used are completely legal?
  
  
  
title: Are website operators allowed to detect and block website content based on browser add-ons?