How many times a day do you fill out our old friend the blog comment form? If you are like me - a lot. Do you type all that stuff in each time? If you do you should grab the AutoFill Forms extension.
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.
First install the extension. Then simply open the Preferences and fill out your data. You can enter common things like first and last name, your address, email, username, or add your own rules. You can have multiple profiles setup. One for blog forms, one for shopping carts, etc. Clicking the Advanced tab allows you to set the keyboard shortcut, Alt+J by default.
Once you have your profile created - anytime you see a form - simply hit Alt+J and it will be filled out!! Occasionally you hit the odd form that doesn’t use common names but I find that the majority work on the first shot.
I have also used this to hold form data for testing so I can quickly fill out an applications form while under development.

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