The best alternatives to CoinTent are Opera, Adblock Fast, and Adblock Plus. If these 3 options don't work for you, we've listed a few more alternatives below.
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Haggle — A CTA buyers want to click, when they aren't ready to demo
Adblock Fast is a new, faster ad blocker and the first open-source ad blocker for iOS (http://appadvice.com/appnn/2015/09/adblock-fast-is-a-free-and-open-source-way-to-banish-ads-in-ios-9
Adblock Plus, the most popular ad blocker on Firefox, Chrome, Safari, Android and iOS. Block pop-ups and annoying ads on websites like Facebook and YouTube.