IBM released a nifty, free scripting tool that acts like a macro program. CoScripter is a Firefox extension that lets you record your keystrokes and mouse clicks, then reruns them when you want. That eliminates the need for you to repeat the steps for the things you regularly do.
For instance, imagine you're searching for the best price on a specific product. You could create a script that opens tabs for a half dozen pricing sites and inserts the relevant data in each one. Or you might create a script that automatically opens the Internet Movie Database and inserts the contents of your clipboard in the search field.
Get CoScripter and watch the tutorial. You can also choose from over 700 existing scripts to play around with.