First seen in 2009, Appearance & Functioning. This page records what the extension did, whether it is still available, and what to use instead.
What it was
AntiAds was one of several early ad hiding extensions written while Chrome lacked a blocking API; it hid known ad elements by CSS. Adblock Plus, AdBlock and uBlock Origin Lite are the ad blockers in use today.
Succeeded by Adblock Plus - free ad blocker
The earlier extension is gone, but its role is filled today by Adblock Plus - free ad blocker, with 40M users and a 3.9 rating. See its statistics and history.
Current alternatives
The extensions the Chrome Web Store ranks highest for "ad blocker" today.