MaxView (Fullscreen anything) от SilverRabbit90

MaxView lets you push any video, image, canvas, or embedded game into real fullscreen on any web page, freeing your content from cramped players and cluttered layouts.

Press F or F11 to maximize the videos after using the extension for complete full-screen mode.

Key features

One-click fullscreen for videos, images, canvas elements, and embedded games.
Toolbar eye icon that reflects the current state: light orange when idle, blue-violet when MaxView fullscreen is active — so you always know at a glance whether it's on.
Redesigned, compact control bar with a slim gradient progress track, rounded play/mute/close buttons, and a short volume slider.
Keyboard shortcut (Ctrl+Shift+F by default) and configurable hotkeys.
Works across frames and on most sites.

Privacy

MaxView collects no data. It requires page access only to detect media and render fullscreen controls.

Press the toolbar button or the shortcut to toggle fullscreen, and press Esc or the close button to exit.

Here you can find my other extensions:
https://addons.mozilla.org/en-US/firefox/user/20110226/

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