Selenium IDE is a Firefox plug-in that allows users to easily create Selenium test cases. At the heart of Selenium IDE is a context-driven menu, which provides access to the HTML elements that are available on each Web page. Selenium IDE also provides the list of available Selenium commands based on the context of the selected HTML element. This context-driven menu details the appropriate HTML element, and its supported Selenium commands. The Selenium IDE is a wonderful way to learn Selenium commands.
Click on Install after the file has been downloaded.
Select Install again, if prompted.