Besides Bruce Momjian, Tom Lane is also a defining, fundamental character behind PostgreSQL. His unforgivingly insightful posts on the pgsql-hackers mailing list makes reading it a very entertaining and educative experience.
(By the way, I can't recommend enough reading that mailing list. It's an ongoing masterclass in "this is how grown-ups write software".)
Wow...I'm generally not bothered by ads, but when they cover up the text of the article and don't give you a way to click out of it, they give me no choice but to not read it.
I wonder if--in the same way most browsers use a heuristic to block pop-ups if they weren't triggered by a user action--we could come up with an effective heuristic to do the same for pop-overs.
I'd think the simplest thing would be blocking "position: fixed; width: 100%; height: 100%;" curtain elements, along with anything that stacks "above" them. They only have two valid uses that I can think of: displaying lightbox-like image galleries, and embedding modal confirmation dialogs in single-page apps. It'd probably be easier to figure out a heuristic to whitelist these two uses, and deny everything else.
(By the way, I can't recommend enough reading that mailing list. It's an ongoing masterclass in "this is how grown-ups write software".)