Added a copy of Firebug Lite for debugging purposes. License is uncertain but being treated as MPL. (If is is not MPL then it is under something more permissive that permits relicensing anyway)
(function(){var Event=tinymce.dom.Event;tinymce.create('tinymce.plugins.NonEditablePlugin',{init:function(ed,url){var t=this,editClass,nonEditClass;t.editor=ed;editClass=ed.getParam("noneditable_editable_class","mceEditable");nonEditClass=ed.getParam("noneditable_noneditable_class","mceNonEditable");ed.onNodeChange.addToTop(function(ed,cm,n){var sc,ec;sc=ed.dom.getParent(ed.selection.getStart(),function(n){return ed.dom.hasClass(n,nonEditClass);});ec=ed.dom.getParent(ed.selection.getEnd(),function(n){return ed.dom.hasClass(n,nonEditClass);});if(sc||ec){t._setDisabled(1);return false;}else t._setDisabled(0);});},getInfo:function(){return{longname:'Non editable elements',author:'Moxiecode Systems AB',authorurl:'http://tinymce.moxiecode.com',infourl:'http://wiki.moxiecode.com/index.php/TinyMCE:Plugins/noneditable',version:tinymce.majorVersion+"."+tinymce.minorVersion};},_block:function(ed,e){return Event.cancel(e);},_setDisabled:function(s){var t=this,ed=t.editor;tinymce.each(ed.controlManager.controls,function(c){c.setDisabled(s);});if(s!==t.disabled){if(s){ed.onKeyDown.addToTop(t._block);ed.onKeyPress.addToTop(t._block);ed.onKeyUp.addToTop(t._block);ed.onPaste.addToTop(t._block);}else{ed.onKeyDown.remove(t._block);ed.onKeyPress.remove(t._block);ed.onKeyUp.remove(t._block);ed.onPaste.remove(t._block);}t.disabled=s;}}});tinymce.PluginManager.add('noneditable',tinymce.plugins.NonEditablePlugin);})();