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Firefox keeps changing my system preferences for opening PDF files on my Mac.

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Firefox keeps changing my system preferences for opening PDF files on my Mac. It keeps changing the default program top open them from Adobe Acrobat to Preview.

It keeps changing the default program top open PDFs from Adobe Acrobat to Preview.

Every time I use Firefox it changes it, forcing me to go in and change the file association.

Firefox keeps changing my system preferences for opening PDF files on my Mac. It keeps changing the default program top open them from Adobe Acrobat to Preview. It keeps changing the default program top open PDFs from Adobe Acrobat to Preview. Every time I use Firefox it changes it, forcing me to go in and change the file association.