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?