I wanted to get rid of the PDF.js viewer, so I followed the instructions on another thread that said:
"You can disable the new viewer as follows: type or open the address about:config search for entry pdfjs double click on the entry pdfjs.disabled;false and it will toggle to true You can then set things up the way you had them before according to your choice and OS."
Now whenever I click on a PDF the save as box comes up straight away. My Acrobat plug-in is enabled, how can I get firefox to start using it again?
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You may also have to set the action correctly for your plugin see
- View PDF files in Firefox without downloading them_if-pdf-files-are-downloaded-instead-of-displayed-check-your-settings
You can change the action for Portable Document Format (PDF) from Preview in Firefox to use the Adobe Reader in "Firefox > Options > Applications".