Disabling the built-in PDF viewer
Ever since you added your internal PDF Viewer, you seem to have traveled down a dark path where you force people to use your viewer by disabling the "Save As" selection in Options:Applications:PDF. Could you please restore the "SaveAs" option?
Oh, I did read the answer to last year's request, and right-click does not always work. Some Web Pages launch another web page which takes care of saving the PDF. Therefore, when you right-click the link, Firefox asks if you would like to save the .html file......
Modified