Theater Mode for YouTube™ (YouTube Wide Screen)

Theater Mode for YouTube™ is a simple yet powerful Chrome extension that forces YouTube to always open in its native theater mode player, providing a wide-screen viewing experience by default. Even if you're not logged in, this extension ensures the player launches in theater mode on every visit by setting relevant cookies and triggering the necessary player actions.

Users can easily switch back to the default mode with a click or a shortcut, but the next visit reverts to theater mode automatically. This extension uses YouTube's actual theater mode feature rather than any superficial CSS or JavaScript tricks, delivering an authentic and reliable experience. No configuration is needed, making it effortlessly convenient. Note that to use this in incognito mode, users must enable the extension's activity there. For feedback or bug reports, support is available via the discussion link.