Hidden Settings

Some settings of Autofill Forms are only accessible via Firefox configuration editor about:config:

extensions.autofillForms@blueimp.net.regExpFormFieldTypes

This setting is used to define which form field types are filled out by Autofill Forms.
It is a JavaScript Regular Expression matched against the "type" attribute of form fields.
To add support for hidden fields, you can change it to the following regular expression:
^(?:(?:text(?:area)?)|(?:select-(?:(?:one)|(?:multiple)))|(?:checkbox)|(?:radio)|(?:password)|(?:file)|(?:hidden))$