Selenium IDE is a Firefox add-on that records clicks, typing, and other actions to make a test, which you can play back in the browser. It allows you to easily and quickly record and play back tests in the actual environment that they will run. Selenium IDE is not only recording tool: it is a complete IDE. You can choose to use its recording capability, or you may edit your scripts by hand. I can recommend this tool. It was easy to use and seemed to work well as promised.
Selenium IDE is part of Selenium, a suite of tools specifically for testing web applications.