Suggest reading/doing: https://blog.malwarebytes.com/security-world/technology/2019/01/browser-push-notifications-feature-asking-abused/.
And:
Get a good ad blocker. Tracking blockers help too.
I use the free browser extensions uBlock Origin and Ghostery.
Block 3rd party cookies etc...
You might want to read:
How to tighten security and increase privacy on your browser - Malwarebytes Labs | Malwarebytes Labs
and
Top 10 Ways PUPs Sneak Onto Your Computer. And How To Avoid Them.
and
How to Debug Your Content Blocker for Privacy Protection
and
Best Practices for Safe Computing - Prevention of Malware Infection
which includes Resources to protect your browser, privacy & help prevent browser pop-up ads and scams
Hope this helps.