Fullscreen is disabled for YOUTUBE

[Ray_Net]

Could someone remember me what i can do to be able to view YouTube video 
in FullScreen ?

My pc is under Windows 7 pro SP1
My UA is (the default for SM 2.38): Mozilla/5.0 (Windows NT 6.1; 
rv:41.0) Gecko/20100101 Firefox/41.0 SeaMonkey/2.38
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