Its biggest advantage is that it is very customizable.
Selenium HQ offers extensive support across multiple programming languages and frameworks, enhancing integration and flexibility. As an open-source and free tool, it enables cost-effective UI test automation with customization options. Excelling in parallel test execution, it reduces testing time significantly. Versatile in handling browsers and integrations, Selenium HQ faces challenges like complex setup, requires programming skills, and lacks dynamic XPath tools. It works best with Firefox and Chrome, though stability issues arise with Internet Explorer.