I suggest in /Block/Adminhtml/Fbimagecleaner/Renderer/Image.php the following change in line 41 from this:
return "<a href='{$url}{$row->getPath()}' target='_blank'><img src='{$url}{$row->getPath()}' style='max-width: 200px' /></a>";
return "<img src='{$url}{$row->getPath()}' style='max-width: 200px' />";
$this->addColumn('image', array(
'header' => $this->__('Image'),
'type' => 'text',
'width' => '250px',
'align'=> 'center',
'filter'=> false,
'index' => 'path',
'sortable' => false,
'is_system' => true,
'renderer' => 'Fballiano_ImageCleaner_Block_Adminhtml_Fbimagecleaner_Renderer_Image',
));