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)
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>{#template_dlg.title}</title>
<script type="text/javascript" src="../../tiny_mce_popup.js"></script>
<script type="text/javascript" src="js/template.js"></script>
<link href="css/template.css" rel="stylesheet" type="text/css" />
<base target="_self" />
</head>
<body onresize="TemplateDialog.resize();">
<form onsubmit="TemplateDialog.insert();return false;">
<div id="frmbody">
<div class="title">{#template_dlg.desc}</div>
<div class="frmRow"><label for="tpath" title="{#template_dlg.select}">{#template_dlg.label}:</label>
<select id="tpath" name="tpath" onchange="TemplateDialog.selectTemplate(this.options[this.selectedIndex].value);">
<option value="">{#template_dlg.select}...</option>
</select>
<span id="warning"></span></div>
<div class="frmRow"><label for="tdesc">{#template_dlg.desc_label}:</label>
<span id="tmpldesc"></span></div>
<fieldset>
<legend>{#template_dlg.preview}</legend>
<iframe id="templatesrc" name="templatesrc" src="blank.htm" width="690" height="400" frameborder="0"></iframe>
</fieldset>
</div>
<div class="mceActionPanel">
<div style="float: left">
<input type="button" id="insert" name="insert" value="{#insert}" onclick="TemplateDialog.insert();" />
</div>
<div style="float: right">
<input type="button" id="cancel" name="cancel" value="{#cancel}" onclick="tinyMCEPopup.close();" />
</div>
<br style="clear:both" />
</div>
</form>
</body>
</html>