When I realized that IOS9 supports ad blocking I finally looked into ad blocking for my iMac, Macbook Pro, and my fave the 12" Macbook. I'm using Ghostery and ABP. Oddly sometimes one of the blockers finds one more thing to block than the other one. So far no conflicts with running two of them. While I'm not paranoid I also like the no tracking feature that Ghostery seems to support. I know there is some controversy about blocking ads, and not supporting web sites. So, I am whitelisting my favorite sites (which includes this one). I don't want to debate this here. I just want t o point out it makes my 12" Macbook run a bit faster to my eyes while using Safari.