Rotate - support 0°, 90°, 180°, 270° - affect Youtube video preview Zoom / Mirror - support zoom (scale), translate x,y , crop, mirror (flip) - support long press +,- button * the value will be reset after pressing the reset button or the rotate button * not affect Youtube video preview * need to adjust value for normal mode and full screen mode Shortcuts - Rotate : ctrl+shift+9 - Zoom in : ctrl+shift+. - Zoom out : ctrl+shift+, - Move left : ctrl+shift+arrow-left - Move right : ctrl+shift+arrow-right - Move up : ctrl+shift+arrow-up - Move down : ctrl+shift+arrow-down - Mirror : ctrl+shift+8 - Reset Zoom/Move/Mirror Options : ctrl+shift+7 Shortcuts with mouse - Zoom : on player > shift+scroll - Move : on player > shift+left-click+move - Reset Zoom/Move/Crop/Mirror : on player > shift+middle-click You can change Shortcuts via Manage Extension Shortcuts - How to Manage extension shortcuts : <a href="https://support.mozilla.org/en-US/kb/manage-extension-shortcuts-firefox" target="_blank">link</a> - Possible Key Combinations : <a href="https://developer.mozilla.org/en-US/Add-ons/WebExtensions/manifest.json/commands#Key_combinations" target="_blank">link</a>