Turn off these browser features which is not proper for your application like text selection, drag then open the file etc.

browser-features.js

/*
 * Disable text selection when double click or drag cursor
 * @dom html element
 */
function disableTextSelection(dom){
  if(dom.addEventListener){
    dom.addEventListener('mousedown', function(event){
      event.stopPropagation();
      event.preventDefault();    
    })
  }else{
    dom.attach('onmousedown', function(){
      var event = window.event;
      event.cancelBubble = true;
      event.returnValue = false;
      return false;
    })
  }
}