Many modern websites make extensive use of javascript libraries for interactive content and increasingly for basic page-layout tasks. Rather than keeping a copy of these libraries on their own servers, many website creators will leverage one of the content delivery networks (Google APIs, Cloudflare's CDNJS, MaxCDN, etc). As an unfortunate side-effect, CDN owners have the ability to track users across any websites that use their services. Decentraleyes is a browser extension that keeps copies of the most popular javascript libraries, rewriting requests to CDNs to use the local copies instead. In addition to increasing user privacy, this technique can also reduce network traffic and speed up loading of websites. Decentraleyes is free software, released under the Mozilla Public License with source code available on GitHub. Decentraleyes is available for Google Chrome, Mozilla Firefox, and Opera.