Some PDFs are not opened by Firefox

Sympton:

When opening some PDFs from the Internet, the Mozilla Firefox browser opens a new window or tab, but fails to display the PDF contents.

Problem:

This can be due to a malfunction of the mozplugger Firefox component.

Solution:

Disable mozplugger. Firefox will download the PDF document and open it with a local application (IGEL Linux 5.07.100 or newer):

  1. Go to System > Registry in IGEL Setup.
  2. Use Search Parameter ... to find the parameter browser_plugin.mozplugger.disable.
  3. Check Completely disable mozplugger.
  4. Confirm the setting with Apply or OK.
  5. Restart Firefox.

    Disabling mozzplugger in the Registry.

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