PDF files have suddenly started to open within the browser windows of Firefox 17. The PDF files are being displayed with the Adobe Acrobat plugin, which is odd, since I have explicitly disabled the Adobe Acrobat plugin in Firefox.
I would like for Firefox to show the download prompt when opening a PDF file, instead.
I have disabled the Adobe Acrobat plugin and I have made sure that PDF files are set to "Always Ask" in the Options dialog.
For good measure, I've also tried disabling all plugins and extensions, and associating all file types to "Always Ask", but to no avail.
So why is Firefox 17 suddenly ignoring these settings?
Best Answer
This is not an Acrobat problem. Firefox 17 handles PDF files natively without using a plugin and by default PDF files now open in the Firefox PDF preview window.
To change this, go to menu Tools -> Options, click on 'Applications' and scroll down to "Portable Document Format (PDF)" (that begins with 'P', so go way past the 'Acrobat ' files at the top)).
To the right you have some options. By default it is set to 'Preview in Firefox'. Change this to something else; 'Always ask' or, if you prefer the Acrobat plugin 'Use Acrobat Reader', choose the Acrobat plugin option (this requires Acrobat Reader to be installed; if Foxit Reader is installed it will instead show Use Foxit Reader, Best Viewer for Ev...)