Rated 4 out of 5 stars
1. low Memory usage:
Firefox + Bluhell Firewall: 200MB
Firefox + ABP: 300MB
2. firefox more responsive, less lag compared to ABP.
1. most blocked ads are international so it little chance to block local or country ads
2. no whitelists URL so you need manually click the icon to enable/disable
3. no personal/custom Filter