I tried many add blocker apps. So far, AdBlocker Ultimate is the best.

I've been using this adblocker for a long time now and primarily to block adds on YT. It's been very effective at doing so with no problems. Only the occasional site will ask me to disable so as to remove annoying blockers that would otherwise prevent me continuing browsing their site which isn't a real problem. Update...It seems that YouTube are blocking videos as they detect my adblocker but when I disable, nothing changes and videos are still blocked. Have reported issue and given a screen shot and now awaiting outcome.

Even Blocks adds on YouTube Videos! Amazing!

Best ad blocker of all time

It's amazing, it even blocks YouTubes ads. xD

AdBlocker Ultimate great extension