The Adobe Acrobat/Reader that is running can not be used to view PDF files in a Web Browser

After installing Adobe Reader 9 I get this error: The Adobe Acrobat/Reader that is running can not be used to view PDF files in a Web Browser. Please exit Adobe Acrobat/Reader and exit your Web Browser and try again.

In Firefox click on Tools->Options and then on the Applications tab

Set the action for the Content Type: pdf File to Use Adobe Reader 9.x and the problem will be solved

Image Credits: Photo by Isis França on Unsplash.

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