When I click on a link to view a PDF file, I receive the error msg: ".pdf could not be opened, because an unknown error occurred. Try saving to disk first and then opening the file."
Firefox vsn 19.0.2
Adobe PDF Plug-In for Firefox and Netscape 220.127.116.11
Tools/Options/Applications/Content Type = PDF File/Action = Adobe Reader
Am able to download/view the file, but want to view in a Firefox window
Please install the following add-on to see if it helps.