Why Isn't My Mozilla-Firefox Ad Blocker working?

I now have to sit through 30-second ads on YouTube everytime I wanna view something, after deleting my Cookies and History. How can I make it work again? What's the problem with it?
Update: @Dunbar: Thank you for your consideration. But the Adblocker comes with Mozilla Firefox. I also already have Malwarebytes. lol. Thanks anyway dude. :D
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