When I click print in Firefox and chose Paperless Printer it would start and run the program. By doing this I save on paper and ink plus I can save in any format that Paperless Printer has. It used to work until approximately a month ago. Paperless Printer still works in I.E. and MS Edge. I've reinstalled P.P. and I also tried refreshing Firefox but nothing helped. Paperless Printer shows as a printer in the list and when chosen the PP program would open up and take over the printing needs and then just store the created file. Now Firefox starts to ready the page(s) to print but PP doesn't open up.