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(){tinymce.create('tinymce.plugins.Directionality',{init:function(ed,url){var t=this;t.editor=ed;ed.addCommand('mceDirectionLTR',function(){var e=ed.dom.getParent(ed.selection.getNode(),ed.dom.isBlock);if(e){if(ed.dom.getAttrib(e,"dir")!="ltr")ed.dom.setAttrib(e,"dir","ltr");else ed.dom.setAttrib(e,"dir","");}ed.nodeChanged();});ed.addCommand('mceDirectionRTL',function(){var e=ed.dom.getParent(ed.selection.getNode(),ed.dom.isBlock);if(e){if(ed.dom.getAttrib(e,"dir")!="rtl")ed.dom.setAttrib(e,"dir","rtl");else ed.dom.setAttrib(e,"dir","");}ed.nodeChanged();});ed.addButton('ltr',{title:'directionality.ltr_desc',cmd:'mceDirectionLTR'});ed.addButton('rtl',{title:'directionality.rtl_desc',cmd:'mceDirectionRTL'});ed.onNodeChange.add(t._nodeChange,t);},getInfo:function(){return{longname:'Directionality',author:'Moxiecode Systems AB',authorurl:'http://tinymce.moxiecode.com',infourl:'http://wiki.moxiecode.com/index.php/TinyMCE:Plugins/directionality',version:tinymce.majorVersion+"."+tinymce.minorVersion};},_nodeChange:function(ed,cm,n){var dom=ed.dom,dir;n=dom.getParent(n,dom.isBlock);if(!n){cm.setDisabled('ltr',1);cm.setDisabled('rtl',1);return;}dir=dom.getAttrib(n,'dir');cm.setActive('ltr',dir=="ltr");cm.setDisabled('ltr',0);cm.setActive('rtl',dir=="rtl");cm.setDisabled('rtl',0);}});tinymce.PluginManager.add('directionality',tinymce.plugins.Directionality);})();