See Unlisted Videos Youtube Extension [verified] -

But what if you stumble upon a channel and suspect they have hidden gems? Is there a browser extension that can reveal all their unlisted videos?

: This tool allows you to search YouTube captions and subtitles , which can sometimes surface content that is unlisted but still indexed by its transcript. see unlisted videos youtube extension

Unlike private videos, which require specific account permissions to view, unlisted YouTube videos But what if you stumble upon a channel