Are you growing tired of having to fill out the same information over and over again? If so then the Autofill Forms extension for Firefox might be a tool you want to take advantage of.
Autofill Forms enables you to fill out web forms with one click or a keyboard shortcut. A set of customizable rules is used to determine the input for each form element. You are able to edit, remove, enable/disable the provided rules and to add your own ones. You can configure the order in which the rules are to be applied and define site specific rules.
I wouldn’t be relying on this extension to remember every single thing – but it does come in handy for the tedious stuff.