The fix is simple: look at the URL of the popup in the top-left corner as it loads, the beginning part is the site that's loading up your popup. For me, it was static.servingit.co so I created the filter
Code: Select all
||static.servingit.co^$popup

As you can see it's in the bottom as well, whichever works for you. You'll have to catch it fast with your eye as it will quickly re-route to the ad-site, but the first domain will be the one responsible for the popup.
Once you have figured out the domain responsible for bypassing your Adblock Plus, go to Adblock Plus Options > Add Your Own Filters and type in ||<enter domain here>^$popup and press Add filter

This is just a tutorial thread on how to take care of popups. Hope it helps and enjoy popupless browsing experience!