How to disable the built-in PDF viewer and use another viewer
Third-party PDF viewer plugins are available if you prefer not to use the built-in viewer.
To switch from the built-in PDF viewer to another PDF viewer:
Click the menu button and choose . .
- Select the panel.
- 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).