[konceptz]

In the web security space its typically called the browser security model and there are differences between browsers. The browser is not just a portal forwarding/displaying the intentions of the developers. If you want to see one of the more obvious examples look at the same origin policy and how it’s implemented across browsers.

Having said that, I do agree that browsers shouldn’t implement lots of crazy features but I personally don’t mind if they have some kind of malicious file scanning feature.