That sounds frustrating! This issue could be caused by Opera’s settings or a macOS feature like 'Reopen windows when logging back in.' Try disabling Opera’s startup options under Preferences > On Startup, and uncheck any settings that reopen tabs automatically. Also, check your macOS login items in System Preferences > Users & Groups to ensure Opera isn’t set to launch at startup. If it persists, reinstalling Opera might help. By the way, I’ve been unwinding with a game featuring unlimited money and gems—great for a quick break! Hope you get this sorted soon!