I learn a ton from YouTube, but taking notes with timestamps was always annoying so I built a simple extension for that.
It's just a simple extension (plain HTML, CSS, JS). Everything is stored locally in your browser — no account, no sync.
60-second demo: https://www.youtube.com/watch?v=rOi7xQ8DLpo
Chrome Web Store: https://chromewebstore.google.com/detail/video-notes/phgnkid...