How do I change the built-in Firefox PDF Viewer?

Firefox recently changed the Portal Document Format (PDF) to use the Firefox built-in PDF Viewer. You can use another PDF viewer like Adobe Reader by changing the default PDF viewer.

To switch from the Firefox default PDF viewer to another PDF viewer:

  • Open Firefox and click on the 'Tools' menu
  • Select 'Options'
  • Click on 'Applications' tab
  • Find "Portal Document Format (PDF)" in the list and click to select
  • From the drop down menu in 'Action' column select the PDF viewer you wish to use

Options Dialogue

Note: if you prefer to view PDF files in Firefox using a a plugin instead of in an external PDF reader application, select Use PDF reader name (in Firefox).

  • Click "OK" to close the 'Options' window.