Some tools rely on user submissions. When a user with a valid link watches an unlisted video, the extension logs the URL into a central directory for other users to search.
If you want to integrate this functionality directly into your browser, these extensions can help bridge the gap: see unlisted videos youtube extension
Link Gopher or Open Multiple URLs
One of the most reliable "natural" ways to see unlisted videos is through public playlists. Even if a video is unlisted, it becomes visible to anyone who views a that contains it. If you suspect a creator has unlisted content, check their "Playlists" tab rather than just their "Videos" tab. 4. Advanced Google Search Commands Some tools rely on user submissions
If you do not want to install a browser extension, several websites aggregate unlisted YouTube videos. 1. Unlisted Videos (unlistedvideos.com) Even if a video is unlisted, it becomes