Downloads PDF does not open, it's a matter of FF?

When I download a PDF file now, it saves a file OK, but when I try to open it, a pop-up window indicates that it is not a PDF file or a file in Adobe. The extension is .pdf. Thank you

I doubt if it's a Firefox problem.

Windows say about these files when you right click on the file and select Properties?
What happens with all the PDF files?
Or just a few from a given source?

These files may have been created by another program PDF and may not be fully compatible with Adobe Reader. Or these PDFs can be altered in any way.

Tags: Firefox

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