[Plugin: Front-end Editor] Image thumbnail not supporting

You’re right. Don’t know how I missed that.

may be you can fix this by editing editor.js. But i dont know how to fix this. please help me

If you feel like playing with the plugin’s code, you should edit editor.dev.js (which is the uncompressed version) and add this line in your wp-config.php:

define('SCRIPT_DEBUG', true);

thanks, i will try this one today