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I've been using pdf.js in Firefox for some time (Firefox 38.0.5 currently and Windows 7) and pdf.js was ok. However lately, I noticed that pdf.js isn't being opened anymore and instead nothing happens.

I dediced to go into my Applications and set so it never opens in PDF.js However I noticed this:

Two PDF content types, one Firefox

To make matters worse, the settings displayed on picture, aren't applied until PDF.js is uninstalled.

I'd like to keep PDF.js for PDFs, but I haven't found a solution.

EDIT: A synced version of Firefox 38.0.5 on Windows XP works fine. Additionally I attempted to refresh Firefox and it didn't work, although the screeenshot from above only shows one file type.

  • Is there some specific reason you need to use PDF.js rather than the Adobe Acrobat plug-in? – user3169 Jun 7 '15 at 16:24
  • Other than preference? No. – Daniel Fath Jun 8 '15 at 9:48
  • What is pdfjs.disabled set to in about:config ? – Cauterite Nov 4 '15 at 15:25
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I fixed this by changing the Action for "Portable Document Format (PDF)" from "Always ask" to "Preview in Firefox" as described in this Mozilla support article.

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