Selenium uses what type of IDE?
The IDE that Selenium uses is called Selenium IDE, and it is a plug-in for Firefox. Selenium IDE is an easy-to-use record-and-playback tool for web application testing. It is an extension of the WebDriver API (which provides methods for controlling a browser and automating it).
The main purpose of the Selenium IDE is to provide a simple way of running tests against an application without actually having to open the application in a browser.