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How do I enable the built-in pdf viewer and stop Firefox from using Acrobat Reader(open external window))?, and give me the option of SAVE ASwith downloaded PDF

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Rafa_
Rafa_

For a long time, I open my PDFs in the firefox built-in viewer. This let me print protected PDFs.

A week ago I reinstall the firefox (win 8 / 64 bits) and...

When I want to drag an PDF file in firefox, the PDF is opened with Acrobat Reader DC in an external window (that don´t let me print protected PDFs) or let me "SAVE FILE" but I can´t view the PDF in the built-in viewer of firefox.

How can I solve this problem?

If I select firefox in the attached image, I go to the same window... is and infinity loop.

The built-in PDF viewer is not available as you can see in the second attached image. I have viewed related problems not solved: https://support.mozilla.org/es/questions/1103456

For a long time, I open my PDFs in the firefox built-in viewer. This let me print protected PDFs. A week ago I reinstall the firefox (win 8 / 64 bits) and... When I want to drag an PDF file in firefox, the PDF is opened with Acrobat Reader DC in an external window (that don´t let me print protected PDFs) or let me "SAVE FILE" but I can´t view the PDF in the built-in viewer of firefox. How can I solve this problem? If I select firefox in the attached image, I go to the same window... is and infinity loop. The built-in PDF viewer is not available as you can see in the second attached image. I have viewed related problems not solved: https://support.mozilla.org/es/questions/1103456
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John99
John99

Did you solve the issue ?

What happens if you open pdf files on the internet, do they open ok in Firefox , or do they also open in Adobe ? Have you seen and followed instructions in

I realise that says without downloading them, but you can save the files from the Firefox viewer tab.