Autolaunch of Safari

Safari is not my default browser. Something is launching that browser without any window, right in front of me. Because it's only showing up in the dock, I have no clue it's launched. I don't know why it's happening. Does anybody know why this might be happening? I can't leave my computer in **Safe Mode** for a week (as was suggested elsewhere) and I don't want to start another user on this computer. Is there a way I can be notified when it starts up? I looked into Shortcuts but they don't have Automation like iOS. Truly odd behaviour. I need to fix this. Any insight is appreciated.