How to cut ads from google chrome and safari on mac?

Question

safari

Today I discovered, sitting in the google chrome browser, such a thing: an advertising banner appeared on all sites. Well, the clickander on the Google search page just finished off my psyche. On mac, I've never seen this problem.
Tell me what to do? I checked the extensions, the left one did not seem to find anything. I reset chrome, didn't help either. In a safari, the same nonsense, only the opera did not move. Browsers began to lag in places, specifically something knocks them out. Thank you.

Answer 1

The easiest place to start is: https://support.apple.com/en-us/HT203987
If it doesn't help, then you need to study where this banner came from, but this topic is too complicated and requires telepaths.

Answer 2

Even a complete reinstall of chrome did not help.