In this post, Jose Saiz explains how web browserscan compromise users' online privacy through mechanisms such as cookies,fingerprinting, and insecure connections. The author distinguishes betweenbrowser security and privacy, noting that privacy focuses on user data and howit is managed. The author discusses the issues of third-party cookies, onlinetracking, and the amount of information that browsers expose, suggesting toolsto make users more aware of this exposure. Finally, the article previews a secondpart with practical tips for improving privacy while browsing.Contact: https://josecurity.es/contacto/