This is probably the best solution I've found so far.

Unfortunately, even this is no match for the user-hostile design of, say, Microsoft Copilot, because it hides content that is scrolled off screen so it's invisible in the output. That's no fault of this extension. It actually DOES capture the data. It's not the extension's fault that the web site intentionally obscures itself. Funnily enough, if I open the resulting html file in Lynx, I can read the hidden text, no problem. LOL.