Do you find yourself doing the same thing over and over again? Do you always have something to say in a certain place, or would you like to test Firefox by setting it to do a number of tasks automatically? If any of this sounds interesting, go and get Selenium IDE.
Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests. Selenium IDE includes the entire Selenium Core, allowing you to easily and quickly record and play back tests in the actual environment that they will run.
With that said, I also found a helpful tutorial on how to set up automated tasks with this extension as well.