LocalCDN is a Firefox extension designed to bolster online privacy by emulating Content Delivery Networks (CDNs). It automatically intercepts web traffic, identifies supported resources locally, and seamlessly injects them into web pages without requiring any user configuration. This functionality enhances speed and reduces reliance on external servers, thereby minimizing exposure to tracking and data collection. Users can enjoy a wide array of frameworks and libraries, including popular ones like jQuery, Bootstrap, and React, all stored locally to ensure privacy and efficiency.

The extension also features synchronization capabilities with Firefox Sync or a personal server, along with prepared rules for ad-blocking tools such as uBlock Origin and AdGuard. LocalCDN continually updates its library, which boasts over 200 different frameworks and versions. It effectively removes integrity and crossorigin attributes, further optimizing the use of these resources while providing notifications for any necessary rule changes. This tool is particularly useful for developers and privacy-conscious users looking to enhance their browsing experience.