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The Age-Checked Internet Has Arrived
(www.wired.com)
This is a most excellent place for technology news and articles.
I'd imagine you'd need a browser that has developer tools, which is far less common on mobile. A simpler solution would be to use a separate app that just takes the page URL and downloads the video for you, such as this one: https://f-droid.org/en/packages/com.junkfood.seal/
Kiwi Browser has developer tools