RoboForm is a Password Manager and Web Form Filler that completely automates password entering and form filling. It allows you to define your personal profile or "usual" responses to a web form. This information is then saved, and when you need to fill a form, just click "Fill Forms" button, and form is filled out. Works as an add-on to Microsoft Internet Explorer, Mozilla, Chrome, Firefox or Netscape web browsers.
Thanks to SalaR for the update.