Great concept, something that needs to be implemented into the browser. However, it breaks YouTube playback in full screen after touching a touchscreen at all while on the webpage. Playback becomes a completely white screen. I disabled other extensions to ensure this extension is the cause.

Workaround: Go to about:config, search for "mousewheel.with_control.action" and set the value to 5 (this is for touchpad pinching and zooming, although it's a little slow). Set "apz.allow_zooming" to true for touchscreen pinch-to-zoom support. Revert any of the "browser.gesture.pinch" settings you may have changed for this extension.