uBlock Origin is an open-source browser ad-blocker. It ships with mainstream filter lists and effectively blocks ads, pop-ups and trackers.
It also protects privacy by stopping crypto-mining scripts and malicious sites. If you want stronger blocking, use its element picker to select and hide page elements.
Enable the browser's developer mode and drag the extension in to install. The latest Chrome no longer allows this install method — use an older Chrome or Edge instead.