Remaps the media previous/next track keys (F7/F9) to seek 5 seconds backward/forward on YouTube videos instead of skipping between playlist items.
Works globally on macOS, so you can control YouTube playback from any app (like Ableton, Logic, etc.) without switching focus. Useful when following along with tutorials or long-form content.
How it works: Intercepts YouTube's Media Session API handler registrations at page load. Zero ongoing overhead — no polling, no observers. Only has access to youtube.com.
