Followed instruction to set Acrobat Reader (since some idiot at Mozilla decided to disable PDF files) and FF52.0.2 will NOT use AAR. It insists on using the crippled .js app. We need to be able to use all of the features in Acrobat for various on-line forms, including API to email clients, printing, etc. Internet Explorer works fine with PDFs but we'd rather not use that questionable siftware.