YouTube Zen by Renato Oliveira

Windowed fullscreen for YouTube: auto-enter, player button, controls hidden until clicked.

Download Firefox and get the extension

About this extension

Three features, nothing else:

Auto fullscreen: the player fills the browser window on each new video. Theater mode is engaged for you and restored on exit.
Player button: a Zen button next to YouTube's fullscreen button.
Controls hidden until clicked: while playing, player chrome stays out of the way; a click shows it for a few seconds. Paused, ended, and ad playback keep controls visible.

No settings page, no storage, no network, no tracking. Shift+F toggles, Esc exits.

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