- Startup in https://support.apple.com/en-gb/HT201262 to try to isolate the cause of the issue.
Select your account and login.
Test.
To leave Safe Mode, click Apple logo in the menu bar and choose “Restart”.
2. Check Login items. https://support.apple.com/guide/mac-help/open-items-automatically-when-you-log-in-mh15189/mac
3. Check for adware.
Run the latest release of Malwarebytes for Mac to remove malware/adware, if installed on your Mac.
For instructions: Install Malwarebytes for Mac v4 Uninstall Malwarebytes for Mac
Click the “Scan Now” button. Once done, quit Malwarebytes for Mac.
Restart the computer and relaunch Safari holding the shift key down.
Scan for Malware again.
4. If this doesn’t help:
Download EtreCheck: https://etrecheck.com/,run it and post the report here.
Click “Free Download” button,
Open Downloads folder, click on it to open, and then select ”Open”.
“Choose a problem” from the popup menu box, and then “Start EtreCheck” in the dialog.
Click “Share Report” button in the toolbar, select “Copy report” .
Paste the report when you reply.