How to disable the built-in PDF viewer and use another viewer
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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:
- Click the menu button and choose . .
- Select the panel.In the panel, navigate to the Applications section.
- Find Portable Document Format (PDF) in the list and click on it to select it.
- Click on the drop-down arrow in the Action column for the above entry and select the PDF viewer you wish to use.
- 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.
- Close the about:preferences page. Any changes you've made will automatically be saved.
Last Update: 2017-09-20