Extended Tracking Powers

Abstract

Users have come to rely on browser extensions to realize features that are not implemented by browser vendors. Extensions offer users the ability to, among others, block ads, de-clutter websites, enrich pages with third-party content, and take screenshots. At the same time, because of their privileged position inside a user's browser, extensions have access to content and functionality that is not available to webpages, such as, the ability to conduct and read cross-origin requests, as well as get access to a browser's history and cookie jar.