Yes, the above code example only works for IE. For firefox you need to write different code to get HTML code from the current selection.

 

For example:

 

var sel=editor1.getSelection();
  if(sel.rangeCount > 0)
  {
   var r=sel.getRangeAt(0);
   var clonedSelection = r.cloneContents();
   var div = document.createElement('div');
   div.appendChild(clonedSelection);
  // r.collapse(true);
   return div.innerHTML;
  }
  else
   return "";