How to Disable/Change Default PDF Viewer in Mozilla Firefox

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Mozilla Firefox browser comes with a PDF viewer/PDF plugin by default. Here is a simple tip to disable default PDF viewer in your Firefox.

Method 1

Open up Mozilla Firebox browser and type about:config in the address bar. Select I’ll be careful, I Promise button.

about:config - Mozilla Firefox_007

Type pdfjs.disabled in the search box.

about:config - Mozilla Firefox_009

Right click on pdfjs.disabled and select Toggle.


Now the value will be automatically changed to true.

about:config - Mozilla Firefox_011

Method 2

Open up Firefox. Go to Edit -> Preferences. Select Applications tab.

Firefox Preferences_002

Type pdf in search box.

Firefox Preferences_006

In the Action drop-down box, define the action you want to perform for PDF files. In my case, here I select Use Document Viewer option to view my pdf files.


That’s it. Now your PDF files are automatically opened by your Document viewer instead of opening within Firefox.

For questions please refer to our Q/A forum at :

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