Firefox 18.0.1 will not download .pdf from internet, add-on incompatible with Acrobat X

The Add-Ons manager says: Adobe Acrobat - Create PDF 1 (disabled)

All that happens now is that, when I click on a PDF Google result, a page with the correct URL opens, but no file is downloaded. If I use Quick View, however, I go to the PDF on the site. If I click Download Original, I just get the blank page again. Any ideas?

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