When I find a link for a PDF file I don’t want Safari to open it in-page. Why not? What if I just want to download it to read it later? What if I have a list of PDF files that I just want to click one after another to start downloading them? What if the PDF file is too big and my internet connection is too slow, so I have a blank window waiting for the PDF to complete the download? What if I have too many opened tabs in Safari and I don’t want to kill my machine downloading a 100MB PDF file?
To force Safari to download your PDF files just open a terminal window and type this:
defaults write com.apple.Safari WebKitOmitPDFSupport -bool YES
If you want to change it back just type:
defaults write com.apple.Safari WebKitOmitPDFSupport -bool NO
You should restart Safari.