Can I somehow get precise screen coordinates (relative to top left corner of the screen) of a DOM object. Through NPAPI\FireBreath or JavaScript. (Need this for plugin, that I'm writing with FireBreath)
you move cursor to somewhere of the page ,and make a click event.(find the window,then GetWindowRect ,caculate a sutable position) then you can catch the event,record clientX and clientY. By this ,you build a bridge between two different coordinate system.