Fixed legacy IDE link to work on Firefox.

Tested on FF32/Win7 x64.

internal/index.html

@@ -19,7 +19,7 @@
         }
     );
 </script>
-<p>To start legacy in-page IDE, <a href="javascript:require('amber/helpers').globals.Browser._open()">click here</a>.</p>
-<p>To popup Helios IDE, <a href="javascript:require('amber/helpers').popupHelios()">click here</a>.</p>
+<p>To start legacy in-page IDE, <a href="#" onclick="require('amber/helpers').globals.Browser._open(); return false;">click here</a>.</p>
+<p>To popup Helios IDE, <a href="#" onclick="require('amber/helpers').popupHelios(); return false;">click here</a>.</p>
 </body>
 </html>