DisableBuiltinPDFViewer

Disable the built in PDF viewer. PDF files are downloaded and sent externally.

Note

As of Firefox 140, this policy no longer completely disables PDF.js; it changes the handler to send PDF files to the operating system. Embedded PDF files are shown in the browser. If you need to completely disable PDF.js, you can use the PDFjs policy.

Compatibility: Firefox 60, Firefox ESR 60
CCK2 Equivalent: disablePDFjs
Preferences Affected: N/A

Windows (GPO)

Software\Policies\Mozilla\Firefox\DisableBuiltinPDFViewer = 0x1 | 0x0

Windows (Intune)

OMA-URI:

./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/DisableBuiltinPDFViewer

Value (string):

<enabled/> or <disabled/>

macOS

<dict>
  <key>DisableBuiltinPDFViewer</key>
  <true/> | <false/>
</dict>

policies.json

{
  "policies": {
    "DisableBuiltinPDFViewer": true | false
  }
}