When FF loaded for first time after update had message about being able to fill in PDF documents. Even said give it a try on a option block. Then it displayed a form with blanks to enter name etc. However I wasn't able to enter name or data in the fields they sent me for trying it out. I could do other things with PDF FF displayed, draw, add text box, but not enter data on the form they sent to try it out. Wish I had saved the PDF they sent to show the new feature.