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When filling in a website form, my home and e-mail addresses are wrong. How do I correct them?

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Whenever I start to fill in a form on some website that requires name, address, e-mail address, etc., my autofill puts in my old address and old e-mail address. Where can I change that?

Whenever I start to fill in a form on some website that requires name, address, e-mail address, etc., my autofill puts in my old address and old e-mail address. Where can I change that?

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Are you using an "autofill" addon?

Look at Tools > Addons > Extensions to see if you have an "autofill" extension.

If not, see this:
http://support.mozilla.com/en-US/kb/Form+autocomplete#Deleting_individual_form_entries