Firefox can't open pdf, can not find pdf in the Type of content in the preferences-> Applications

I have a version of Acrobat Reader DC on MacBook Pro, but whenever firefox tried to open the pdf file, it asks me to install Adobe Acrbat NPAPI plugin and when I allow / remember, it gives me just white screen.
All results of the research suggest that I fixed it by going to the preferences of Firefox, Application tab, search PDF or Portable Document, Content Type and select the NPAPI plugin from Adobe Acrobat. BUT my PDF search returns nothing.
All I have is Adobe Acrbat FDF document,
What should I do to solve this problem in this case?

Hello

Enter about: preferences #applications < Enter > in the address bar.
What is the information for files of type?

A you wish to display the file in Firefox, or another Viewer?

For more details, please see this topic: https://support.mozilla.org/en-US/questions/1045938

Hope this helps

Tags: Firefox

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