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Hello mcarterBOOM,

Thanks for that info and for choosing the Apple Support Communities. If we understand correctly, you are having an issue with Safari on your Mac popping up a Finder window unexpectedly on your Mac. First, try restarting your Mac and then hold the Shift key when opening Safari and here is more info:

Prevent apps and windows from reopening

Next, use safe mode to start up your Mac as it does the following things:

• Verifies your startup disk and attempts to repair directory issues, if needed
• Loads only required kernel extensions
• Prevents Startup Items and Login Items from opening automatically
• Disables user-installed fonts
• Deletes font caches, kernel cache, and other system cache files

Log in to your user account and test the issue while in safe mode and then restart normally and test the issue again.

How to use safe mode on your Mac

Graphics performance limited in macOS Recovery, safe mode, or Guest User mode

Cheers!

Thanks for replying, mcarterBOOM, and that additional info, it really helps! You can figure out if unexpected behavior is related to a user file or setting by trying to reproduce the issue from another user account. This process includes creating a new user account, logging in to it, and testing for the issue.

Set up users, guests, and groups on Mac

If you have this issue in a new user account, please contact Apple directly for further assistance:

Get Support 

Have a great day and thanks for using the Apple Support Communities!