Purple Private Windows is a free Firefox extension designed to enhance user privacy by providing a distinct visual cue for private browsing sessions. When activated, it transforms the appearance of private mode windows to a unique purple theme, allowing users to easily distinguish between standard and private browsing sessions. This feature is particularly useful for those who frequently switch between different browsing modes, ensuring that privacy is maintained while navigating the web.

As part of the security and privacy category, this extension focuses on anti-spam and anti-spy functionalities. By visually indicating when users are in private mode, it helps remind them that their browsing activity is not being tracked, thus fostering a more secure online experience. This straightforward yet effective tool is ideal for anyone looking to enhance their browser's privacy features without complicating their workflow.