New Chromium framework for browser extensions that severely limits their functionality. It neuters adlockers.

Here, this should help. tl;dr: Google updated how Chrome security works and it broke apps like every adblocker at the time.

Google sells it as an updated extension framework to improve security, privacy, and performance of extensions... But it also nerfs adblockers ability to block all ads.

There are some forks from chrome that haven't implemented the new manifest thing. So if you really need to, look for those.