Safari Won't Open

Am thinking the Old Safari is not compatible with the New iMac running Big Sur on the M1 Chip. If that is factual the only option I see is Restart in Recovery Mode Start up a Mac with Apple silicon in safe mode as per below - an choose Reinstall macOS. This should over write the Old Safari with the Safari for M1 Big Sur version.

1. On your Mac, choose Apple menu  > Shut Down.
2. After your Mac shuts down, wait 10 seconds.
3. Press and hold the power button on your Mac until the startup options window appears showing available startup disks and Options.
4. Select a startup disk.
5. Press and hold the Shift key, click Continue in Safe Mode, then release the Shift key.

Try the Control and click and grant permission

You could try to make a new user and use the Mac with that or you can create a new admin user that could go into parental control.

Welcome and Thank you too :-))

Sorry the long process - 3 hours download but Most Important - Safari will now function on this new M1 iMac.

Enjoy and do come back to the ASC Forums if / when more question arise. There are many Contributors willing to assist.

What was migrated from Old to New ? Everything including Applications too ??

Yes please keep us updated on success or otherwise - it time permits.