Firefox engineer is developing a notification system for A security warning is displayed when a user visits a Web site that has encountered data leaks. The notification system will use have I Been pwned? The Web site provides data that indexes the disclosure of public data, allowing users to query their information for leaks. The Data disclosure warning notification System was developed only soon after the code will not be integrated in Firefox, but as an extension to provide users. Troy Hunt, author of Have I Been pwned, confirms that he is working with Mozilla to develop this security feature.