"Do you have some mundane task that you have to do regularly
through a Web browser? Are you a developer who wants to
automatically test the interface of your latest Web application?
Maybe you want to log into all of the sites you visit on a daily
basis with one click. If you fall into any of these categories, you
should check out the iMacros Firefox extension.
"The iMacros for Firefox is a record and playback automation
tool for the browser. The extension uses the Firefox engine to
track all actions and record them in scripts that can be saved,
shared, and loaded for playback..."