Sorry to pop this up, but you may want to check if you have a malware on your computer causing the popups.
You can check malwarebytes it is free and good.

If not then you may need to know that popups ads are a way for some sites to get revenue and the ad companies serving these try their best to bypass ad blockers. However a good adblocker is adblock but it may also block other things.

Kind Regards