Thanks for the reply. I mentioned on the first string of the description, that there is a bug related to how Firefox works and I still haven't resolved it. Some websites tend to be broken or load forever.

However it's possible to just turn down PopUpOFF for the given website and it won't bother you there. My extension uses very different (and not perfect, at least yet) way to detect and block popups - you can compare its size with other popup blockers - and none of them will block overlay walls on some websites, I assure you.

So there is a risk that some websites are gonna be broken, but in return, there won't be annoying ads and cookie notifications somewhere else. For now, that's the deal.