userscript: search a string inside a new webpage (using a link)

Hi, I’m writing a userscript for a website, I’d like to get an info that is in a new webpage, this new webpage is linked in the current webpage. Is there a way to parse the DOM of the new webpage (without opening it in the browser obviously) in order to get the info and use it in the current webpage?

submitted by /u/P0lpett0n3
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