Cannot open pdf files in Firefox.

I cannot open pdf files in Firefox. (I can in Chrome).
I tried Menu - Preferences - PDF - Use Adobe Acrobat Professional. Also tried the same with PDF Browser Plugin 2.4.4
Clicking on a PDF link just opens a blank page.

When I enter about:preferences#applications <Enter> in the address bar, then for PDF it shows:
pdf File (application/x-download) ... Use Adobe Acrobat Professional
pdf File (application/x-pdf) .... Use Adobe Acrobat Professional
Portable Document Format (PDF) ... Save File'''
I would like all PDF's to open in Adobe Acrobat 8 Professional.
Right now none of the PDF's open at all, so opening in Firefox or any other viewer would be preferred over not showing up at all.

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