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How to disable the built-in PDF viewer and use another viewer

Third-party PDF viewers are available, if you prefer not to use the Firefox built-in viewer. To switch from the built-in PDF viewer to another viewer:

  1. Click the menu button New Fx Menu and choose Options.Preferences.
  2. Select the Applications panel.
  3. Find Portable Document Format (PDF) in the list and click on it to select it.
  4. Click on the drop-down arrow in the Action column for the above entry and select the PDF viewer you wish to use.
    ApplicationsPDF Fx47Applications-PDFwin7
    Note: If you want to view PDF files in Firefox using a plugin, instead of in an external PDF reader application, select Use PDF plugin name (in Firefox). For more information, see View PDF files in Firefox.
  5. Close the about:preferences page. Any changes you've made will automatically be saved.
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This article was created and added to Hot Topics based on this discussion:

I added philipp (madperson) to the contributor list.

The original version of this article was copied from the View PDF files in Firefox article section, Using a PDF reader plugin. However, those instructions only covered switching from the built-in PDF viewer to a plugin, since that article was about viewing PDF files "in Firefox".

I edited this article so that it also covers switching an external PDF reader application, which some people prefer to use.

The built-in PDF viewer and related bugs are also discussed throughout this thread: