Screenshot extension for Chrome or Firefox

I need an Extension with following characteristics: 1) make a Screenshot ( not Full Screen only predefined X and Y Point, that i can set ) in good Quality 2) convert to base64 in good Quality 3) open a new Tab or Window, call an predefined URL ( must set by me ) with the base64 image as parameter. 4) do that all with with a Shortcode ( i.e. STRG + > ) Thats all, no saving of file, nothing more to do.