Opera browser. Youtube. Steam Deck L4-5 - for fullscreen (F, F11). R4-5 for page reload (F5, CTRL). LS for scroll and Youtube playback speed (<,>). Y for new tab. B for shift (LS+B - horizontal scroll, Y+B - reopen last closed tab.) X to show keyboard. Left trackpad for scroll and middle mouse button. Mouse Inputs Keyboard Inputs
