Security Header Injections — Web Security Policies

uBlock is a browser-based content blocker that functions as a declarative filtering engine to intercept network requests and modify web page content. It operates by parsing standardized filter lists into optimized data structures, allowing it to block network hosts, enforce security policies, and prevent unauthorized data transmission. The extension provides a comprehensive security layer that monitors outgoing traffic and disables intrusive browser features to enhance user privacy. What distinguishes this project is its granular control over filtering behavior through a dynamic rule orchestrator. Users can manage custom rules, apply site-specific overrides, and toggle filtering settings on a per-domain basis. The engine also employs advanced techniques such as CNAME uncloaking, IP address filtering, and response body modification to identify and neutralize trackers that attempt to bypass standard blocking methods. Furthermore, it supports enterprise-grade deployment, enabling organizations to enforce consistent security and filtering configurations across managed environments. The project covers a broad capability surface including cosmetic page modification, which uses CSS injection and sandboxed scriptlets to remove visual clutter and neutralize anti-blocking scripts. It also provides interactive tools for real-time network traffic inspection and manual element removal, ensuring users can debug and customize their browsing experience. The extension is designed to maintain high performance by synchronizing its initialization at startup, ensuring that all security rules are active before any network requests are processed.