I´d assume you use chromium, then:

       git clone git://bitreich.org/privacy-haters
       doas cp privacy-haters/chromium/default /etc/profile.d/chromium.sh
       doas chmod +x /etc/profile.d/chromium.sh

Logout and login again. Of course, run UBlock Origin under Chromium. Go to the settings and enable most ad blocking subscriptions, but don´t use AdGuard and Easylist at the same time, they often use the same ban lists.