PrivacySpy is a Firefox browser extension designed to improve user awareness of privacy policies across the web. This tool emphasizes the importance of transparency in data handling, ensuring that users can make informed decisions about their online interactions. By downloading a comprehensive summary of its database upon startup or every 24 hours, PrivacySpy conducts local checks on the websites visited to provide insights without sending any browsing data to external servers.

As an open-source solution licensed under GPLv3, PrivacySpy not only supports user privacy but also encourages community involvement through its accessible source code. This extension falls under the Security & Privacy category, specifically focusing on anti-spam and anti-spy functionalities, making it a vital addition for those concerned about their online safety.