Question

Is there way to check in javascript code if built in PDF.js viewer is disabled

To restore functionality of my site I want to ask user to disable built in PDF.js viewer. To determine if Adobe acrobat reader plug-in is enabled i check navigator.mimeTypes["application/pdf"].enabledPlugin property. But this plug-in seems to be enabled independently from the setting described in View PDF files in Firefox without downloading them article. So is there a way to determine in javascript code if 'Preview in Firefox' or 'Use Adobe Acrobat (in Firefox)' values are set.

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