Send a Facebook Chat to Friends using Browser Console

gistfile1.txt

// target the every anchor element (friend in friendlist)
var elem = document.querySelectorAll("a._55ln");
for(var i=0 in elem) {
  // trigger the anchor element
	elem[i].click();
	//target the text area
	var textArea = document.getElementsByClassName("uiTextareaAutogrow _552m");
	var chatBox = textArea[0];
	// message value here
	chatBox.value = "Hello, This is a test chat from console please dont reply";   

	// create an event    
	var evt = new Event("keydown");

	// keycode for Enter/Return key
	evt.keyCode = 13;

	// it will trigger the Enter/Return key
	chatBox.dispatchEvent(evt); 
	
	// Facebook only opens 20 chatboxes
	//it will close every chatbox opened dynamically
	var closeBtn = document.getElementsByClassName('_3olu');
	closeBtn[0].click();
}

Thanks :)