Outstanding Add-on. It's in my top 5 favorite Add-on list. Autofill has the best help menu I've seen on an Add-on.

I have a form I use on a daily basis, and the option to change the maximum number of results is at the bottom of the page. It was very annoying to always have to scroll to the bottom of the page and change the default setting of 10. With Autofill, I was able to make it so that the combo field automatically changed the field from 10 to "Show All". And I'm amaze that it does it so quick that I don't even see the page displaying only 10 results, and instead it appears to instantly display the full results.

(IMHO) In order to give the user great flexibility and advanced features, the Add-on needs some level of complexity which may make it more suited for slightly advanced users or developers.
However, the great help menu, also has example usage, which makes it easily usable by the average user as long as the help menu is used and the user is willing to put in the effort.

I believe most users who rate this add-on low, and state that it didn't work, are not using the help menu.

I highly recommend it for any mid-level or advance user.