I regularly register at websites that either force me to register to leave a comment or that offer such great value that I want to join to become a member of the community. The signup process is always the same. Enter a username, a password, a valid email and if you want several additional information about yourself to register at that website.
If you do that regularly this becomes a tedious time consuming process. I like to automate stuff like that. Autofill Forms is a Firefox extension that lets you fill out web forms with the click of the mouse / pressing a keyboard shortcut. It is possible to create profiles in case that you are using more than one identity on the Internet or use the extension for work and spare time.
You can fill out a lot of variables like name, username, street, city, phone and several others with the option to add new ones to that list or edit existing fields. This is important because the extension uses possible form field names to identify forms on the website.
By default it assigns the birthday to forms that have the name byear, birthyear, birth-year or dob-year. It would be possible to add ‘date of birth’ to that list and every other phrase that comes to your mind.

It is possible to set rule priorities and add site specific rules. Profiles can be exported which is excellent if you work with different computers. The default keyboard shortcut for filling out a form is ALT + J.
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I prefer the InFormEnter extension:
https://addons.mozilla.org/en-US/firefox/addon/673
After you set it up, any form field you come across can be filled with just 2 clicks. The extension also supports multiple profiles, and you can back-up your info to a simple text file. I wouldn’t suggest storing passwords in it, though…
I’ve been using the Google Toolbar AutoFill option until now. Thanks for ‘filling me in’ on this extension.