PrivacyExtensions

Privacy extensions are software add-ons for web browsers that aim to reduce online data collection. They typically block trackers and ads, prevent certain kinds of fingerprinting, enforce encrypted connections, manage cookies, and control the execution of scripts. By altering how pages load and how data is shared with third parties, these extensions seek to make online activities more private and to limit profiling, sampling, and data leakage.

Common features include URL filtering, blocking third-party requests, and forcing HTTPS. Some extensions maintain privacy-focused settings and allow per-site exceptions. They often integrate with lists of known trackers or domains and may provide dashboards showing blocked items.

Prominent extensions include uBlock Origin (privacy-focused content blocker), Privacy Badger (tracker blocking by Mozilla), HTTPS Everywhere (encrypted connections), NoScript (control over active content), Ghostery (tracker and ad blocking), and Cookie AutoDelete (automatic cookie cleanup).

Most use browser APIs to intercept network requests, modify headers, and remove or block cookies; some provide script control; others isolate data or prevent fingerprinting by reducing available signals. They rely on community-maintained lists and may be open source.

They can break site functionality, and performance can be affected. Trust concerns exist because extensions can itself collect data or introduce vulnerabilities; users should pick reputable sources, review permissions, and prefer open-source options when possible.

Used by individuals seeking greater privacy and by organizations implementing policy, privacy extensions complement built-in protections but are not a substitute for secure behavior or network-level security.