YouTube: always use theatre mode
Automatically switches the player to the wide theatre layout whenever a watch page opens.
Code to copy
// Switch to theatre (cinema) layout automatically on watch pages
function forceTheatre() {
if (!location.pathname.startsWith('/watch')) return;
const flexy = document.querySelector('ytd-watch-flexy');
if (flexy && !flexy.hasAttribute('theater')) {
const player = document.querySelector('.html5-video-player');
if (player) {
player.dispatchEvent(new KeyboardEvent('keydown', { key: 't', keyCode: 84, bubbles: true }));
}
}
}
setTimeout(forceTheatre, 1200);
window.addEventListener('yt-navigate-finish', () => setTimeout(forceTheatre, 800));How to use this example
- Copy the code with the button above.
- Install JustZix (2 minutes) and open the extension on the target page.
- Add a new rule matching that page.
- Paste the code into the rule's JavaScript panel and save — it runs on every page visit.
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