I know it's possible to disable pop-ups, and that's the default behavior, but It's not affecting the pop-unders.
but you need to block all scripts on a domain using Chrome's own script blocking feature.
the extension ScriptNo Chrome's build-in script blocking in:
At the moment Chrome's API do not allow proper script blocking which is also why Firefox' NoScript developer has not yet ported his extension. Third-party extensions like ScriptNo suffer from the same problem.
The lack of needed API can allow scripts to still load the first time you visit a website.
By design there is no option for extensions to effectively block scripts like in Firefox, therefore the only way to stop this behavior is to block all scripts on a domain using Chrome's settings which I mentioned at the top.
Chrome allows you to set preferences for EACH specific site.
Click on the icon in the browser.
Opens a window allowing to set Java and so on specific to that site.
Now to the pop-unders.
I personally use the Chrommes Poper Blocker extension.
It works for me, but then I have not visited your websites.
Poper Blocker 1.69 Blocks all these annoying popups and popunders that pop no matter!
If interested, get it here:
Here is a video showing you how to do it. https://www.youtube.com/watch?v=WBiOlO1jwX4