Youtube has a gaming option for watching video. That option has nice screen and comment section ratio (especially in live mode. But when switching, I have to replace url "www" with "gaming", kind of tired. So, that's why I make this - a click to change between normal and gaming mode.

v1.1
Move button to topbar

v1.2
Fix bug sometime not load button

v1.3
Change icon, icon's position in top bar

v1.4
Optimize code, clear interval when finishing load button