Swift Proton VPN is a free browser extension designed for Firefox users, offering enhanced online privacy and security with an easy-to-use interface. This tool is a fork of the official Proton VPN, featuring a range of functionalities that allow users to manage their VPN settings more effectively. Key features include site-specific rules, which enable users to connect certain domains or subdomains to designated countries or servers, thus providing tailored browsing experiences. Additionally, the extension automatically disconnects the VPN when visiting sites not included in the user's Swift rules, ensuring seamless internet access without compromising security.

The extension also supports importing and exporting rules, allowing for easy backup and transfer between devices or browsers. Users can receive prompts for blocked sites, enabling quick additions to their Swift rules. The reconnect feature allows users to quickly return to their last used server or country, and the favorites functionality lets them pin preferred servers for easy access. Overall, Swift Proton VPN combines robust security features with user-friendly controls, making it a valuable tool for enhancing online privacy.