[AdmiralAsshat]

So what happens if the page is behind a paywall and the embedded Javascript stores some authentication or phone-home code? Does that end up getting invoked on the monolith copy HTML?

I'm wondering how this would work if I wanted to use it to, say, save a quiz from Udemy for offline review.

[hollander]

yt-dlp can use browser cookies to get access to Facebook videos. This should have something similar.

    yt-dlp --cookies-from-browser firefox https://www.facebook.com/1234videos/5678/