How to manage permissions of full screen of Firefox on HTML5 videos?

I accidentally put youtube HTML5 player to turn off the mode full screen - how to reactivate or manage my permissions for HTML 5 video full screen?

This seems to be stored as a license.

You can open the subject: permissions page via the address bar and select www.youtube.com in the left pane.

You will notice a select full screen with three choice and currently selected block.

You can set on allow or always ask as you want.

Also accessible via Tools > Page Info > permissions

Tags: Firefox

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