1Blocker lets you block ads, trackers, and other unwanted web content. It's easy to use and doesn’t slow down Safari. 1Blocker comes with over 120,000 built-in blocker rules. It is very configurable and all your settings are synced over iCloud.

Getting started with the AdBlock for Safari app : AdBlock Help May 07, 2020 AdBlock — best ad blocker - Chrome Web Store AdBlock is the best ad blocker with over 60 million users, and one of the most popular Chrome extensions with over 350 million downloads! ===== FEATURES ☆ Block pop ups, ads, and annoying banners (even remove video ads!) on YouTube, Facebook, Twitch, and all your favorite sites ☆ Block third-party trackers and protect your privacy ☆ Browse safely by blocking malicious ads with malware Best ad blocker for safari? | MacRumors Forums May 04, 2020

I actually work for Adblock Plus (not a developer though). Apple launched the update to Safari 12 too early for High Sierra users, rendering it impoosible for them to release extensions from app review in time. Check your AppStore now - Adblock Plus should be available again, and few features will be added with the next update asap.

Jun 12, 2020 BEST Safari Ad Blocker - YouTube Nov 09, 2019