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Since installing Nuance PDF Converter Professional, PDFs are opened by Nuance instead of Acrobat, which is also installed. I want Acrobat to be the default.

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I have been a longtime user of Firefox and Adobe Acrobat (NOT the reader). A few months ago I installed Nuance PDF Converter, and stipulated that Acrobat should be the default when opening PDFs. However, when the PDF is opened under Firefox, Nuance is used. I have disabled and uninstalled the Nuance add-in for Firefox, yet it won't go away. It is still used to open PDFs under Firefox. Is there a way to change this?