I2P In Private Browsing is an experimental Firefox extension designed to enhance online privacy by integrating with the I2P network. It introduces various 'Private Browsing' modes that facilitate secure browsing through I2P. The extension isolates I2P-specific settings within contextual identities in Firefox, enabling automatic loading of these settings when needed. Key features include automatic request interception for .i2p domains, visual indicators for I2P browsing, and proxy configuration for various I2P types.

Additionally, the extension aims to manage traffic by contextual identity, allowing users to browse anonymously. It provides specialized modes for different activities, such as I2P Social Networking and I2P Blogging, each with tailored settings for identity management. The plugin also includes health monitoring for the I2P router and is continuously evolving with new features to improve user experience and security.