The author of an open-source browser extension, XSSpect, is a penetration tester who created the tool to help quickly identify cross-site scripting vulnerabilities in web applications. The tool can automatically inject thousands of XSS payloads into input fields and determine if a web application is vulnerable without requiring setting up a proxy or using command-line scripts. It also allows submitting authenticated payloads without user credentials or session cookies, making it convenient for quick vulnerability scanning. The extension has various features such as scan history, payload management, results export, and settings for customization, including options to set timeouts and delays between requests. However, the current version has limitations, including only handling HTTP GET requests, and there are plans for future enhancements, such as improved real-time progress bars and support for additional file formats.