uAssets is the curated collection of filter lists that powers uBlock Origin’s ad blocking, anti‑adblock circumvention, and privacy‑tracking protection capabilities. It serves as the upstream repository of rule sets for the uBlock Origin browser extension, storing precompiled filters in the Adblock Plus syntax and organising them into categorized groups for selective activation.
The repository distinguishes itself with a maintenance architecture designed for efficiency and reliability. Filter lists are revision‑versioned and delivered via a differential patch mechanism that transmits only changed rules between updates, while bundles are minified and gzipped to minimise download size. For content that requires JavaScript‑level countermeasures, the repository includes scriptlet injection payloads that defeat anti‑adblock scripts. Community‑maintained rules address site breakage caused by aggressive blocking, and the decoupled asset pipeline keeps list maintenance separate from the extension’s core codebase, enabling independent updates.
Beyond blocking advertisements, uAssets provides dedicated filter sets for blocking third‑party trackers, analytics scripts, and fingerprinting attempts. The collection also covers popup and video ad removal, anti‑adblock script defeat, and broader web‑content customization, all packaged as a browser extension asset set that supports the uBlock Origin syntax.
