How to get rid of unwanted pop-ups in my MacBook Air

13Fish Said:

"I have been getting similar notifications coming up on my computer. I didn't download anything before this started, I was web browsing. How can I get rid of these?"

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Thank you for the screenshot.

Troubleshooting Notifications:

A. Turn Off Notification for this App:

Safari seems to be the app here. So, disable notifications for it. Go here: Turn off Notifications for an App or Website on Mac - Apple Support

B. Boot in Safe Mode:

Boot your Mac in Safe Mode, and try disabling notification in that. While booted in Safe Mode, login items do not sun, and corrupted system file are intentionally fixed.

C. Scan with Malwarebytes for Mac:

Start with running a scan for malware, using Malwarebytes for Mac and remove what is found. Perhaps something was installed that made this occur. Remove what is found from the quarantine. Malware is short for: Malicious Software, which makes you computer act in a mislead manor.

Downloads:

1. Malwarebytes Anti-Malware for Mac
2. Malwarebytes Uninstalle

Please see the very informative user tip below. 

Stop unwanted Notifications - Apple Community

No further steps will be required.

You are quite welcome.

You are welcome.