How to disable the built-in PDF viewer and use another viewer
If you'd rather not use the built-in PDF Viewer, you can use another PDF viewer like Adobe Reader, Nitro PDF Reader or Sumatra PDF.
To switch from the built-in PDF viewer to another PDF viewer:
- At the top of the Firefox window, click on the button and then select
- Select the
- 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 reader name (in Firefox).
- Click to close the Options window