I use a different add-on. How it works is; Load the web page. Fill out all the fields you want the form filler to know. Once you are done, tell the add-on to save the information. ( Check its instructions. ) After, fill out the rest of the page and send it. Note1: At some point, open the add-ons options. Check the saved information. There are two ways for the data to be used. *1) use only on that page / site. *2) use on all pages / sites. Note2: Not all web sites use the same input names for the same item. For examples: Name / First / Last / Fname / Lname / Zip / Zipcode / Address / Address1 / '''. . . . .''' and so on. So you will end up having more then one listing for the same information. Always monitor what is placed on the web page, just in case.