I resisted using an adblocker for years. Finally installed ABP about 6 months ago, when a handful of sites I was reading started in with the double-underline-w

I resisted using an adblocker for years. Finally installed ABP about 6 months ago, when a handful of sites I was reading started in with the double-underline-word ads and some of them would trigger malware warnings on mouseover. "Threat to be blocked" is exactly right.