HELP! Getting rid of Pop-Ads on a 2012 MBA?

All of a sudden I'm getting these pop up ads from Slick Savings, Deals, and other savings sites. How do I get rid of them?

When the ads pop up, it shows a settings icon, but the only choice is to remove the pop up ad for the site I'm visiting "forever". How do I remove them for good so they don't pop up at new sites I visit?

Thank you.

I found the solution.

I went to SAFARI > PREFERENCES > EXTENSIONS

From here, I uninstalled each ad that was enabled within AD BLOCK.

How it got there, is beknownst to me.