Adblocker Utility Pro is a great, free, blocker that can handle the majority of pop-ups and banner ads that appear on Safari.

It's also a dab-hand at preventing autoplay videos on sites, and can even block ads on YouTube. Those worried about privacy will like the various safeguards against trackers that follow you around the web, plus there's malware protection if something should manage to slip through the net.

AdBlocker Utility Pro offers lots of useful features, all in a lightweight app that is simple to use.

LEGAL:
Terms of Use: https://docs.google.com/document/d/1Sy7hJdltQSNrsmly7uXCAERWHasbya9IaVCCXBalZGY/
Privacy Policy: https://docs.google.com/document/d/1rzcnlnCkNPCbhyBuGjS96Gk-Is6ZpG9mDY_5UQ9EQHE/

SUBSCRIPTION DETAILS:
• Adblocker subscription provides secured private browsing and ad blocking capabilities.
• Once the subscription with a trial, if offered, is activated, you can use it for 3 days for free and cancel at any time.
• Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period.
• Account will be charged for renewal within 24-hours prior to the end of the current period.
• Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase.
• Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription.