Question

Is there an easy way to detect wether the new internal PDF-Viewer of Firefox is the primary PDF-Viewer or not.

I am providing PDF-Documents with Inputfields for a user to enter values. The Problem is, that the new internal PDF-Viewer for Mozilla is not able to give that functionallity. This I know and I can accept. But I would like to check if the User is trying to open the PDF with Adobe Acrobat Reader or the internal PDF-Viewer so that I can send a warning before the user opens the PDF.

My Question is: Is there a value that i can read in via JavaScript to detect with what application Mozilla Firefox is trying to open my PDF. In Chrome for Example it is possible to get that information via the navigator plugin. But it isn't working in Mozilla.

If there is no such possibility at the moment, is there anything like that planned?

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