Why can't I open PDF files in a Firefox tab? Why do they open in PDF-XChange Editor instead?

  • Knowledge Base Article: KB320
  • Created On: Jun 7, 2011 08:18 AM
  • Last Modified: : Oct 10, 2017 04:15 PM
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Documents open in PDF-XChange Editor when I click on PDF links inside Firefox. I want to view documents in the browser. Why do they open in PDF-XChange Editor instead?


Firefox no longer offers support for NPAPI plugins, which means it is not possible to view PDFs in that browser as the relevant plugin for PDF-XChange Editor does not support it. Therefore, PDFs opening in PDF-XChange Editor is the correct setup.


Follow the steps below to determine the manner in which Firefox handles PDF files and other content:

1. Open Firefox and press F10 to enable the Menu Toolbar, then click Options in the Tools submenu:

The Preferences section will open.

2. Scroll down to the Applications section:

3. Use these settings to determine the manner in which Mozilla Firefox handles the listed content. The best setting for PDF files is to use PDF-XChange Editor, as detailed above.


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