It is worth $18. It is a quality adblocker. If i were you i would purchase it.It is currently possible to get lifetime for $18
Block Ads to Optimize Your Internet Experience & Protect Your Devices From Malware
Then add the promo code BFSAVE40 on the checkout screen.
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However, is this software worth having ? There are alot of free ad blockers available and most security suites include ad-blocking.