Auto-enable Theater mode and resize the YouTube player to fill the viewport height, with stable fallback scroll behavior and header overlay fix. (Unofficial)
目前為
On YouTube:
Automatically enables Theater mode
Resizes Theater mode to use the full available height
Scrolls to top so the video is fully visible
Debug hotkey: Ctrl + Alt + H to toggle header overlay (this is only for troubleshooting, don't use this)
No extra buttons. No bloat. Just a better video layout.
Just put T or press the theater button as normal.
More info:
Smart sizing with CSS svh/dvh fallback
Handles mobile-safe viewport units with graceful degradation.
Persistent preference for Theater mode
Writes to YouTube's localStorage keys to make Theater mode default.
No interference with normal YouTube features
The script doesn't touch Shorts, embeds, or override buttons. It's invisible until you're on a video.
Lightweight and silent
No network calls, no data collection, just pure DOM/CSS adjustments.
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