Is it possible for a website to collect data such as the plugins/fonts installed without sending it thought http requests?

If so, is there any plugin for any browser that tells the user what type of information the website is trying to extract from the browser?

  • Perhaps your question is when does a browser send data like installed fonts to a server? – schroeder Aug 25 '17 at 21:33
  • Like HTTPS, WebRTC, Web Sockets, etc? – Bacon Brad Aug 25 '17 at 23:22