This is on Mac OS. I stopped using Firefox and want to use Safari. However Adobe Acrobat shows no setting to change to reset the default browser. The system already has the default browser set to Safari. Thank you.
I am using MS Windows 10 but I'm sure you should or could find a similar setting in your macOS:
Got to EDIT --->>> PREFERENCES--- "Web Browser Options" section
When you click on the link " How to set up your browser to use Adobe products to view PDF documents" a pop up will open up with a list of web browser found in your system (if you have more than one (of course)
Make sure to tick the checkbox "Always use this app". This is key to make that app the default browser use by Acrobat in this case