About: This plugin pops up a preview when the mouse is over a thumbnail
This plugin serves a nice feature: Live previews without excessive clicking. Thus, it helps to get a fast overview over larger numbers of pictures. However, it lacks a real feature: Preview in the "edit mode" multi-select overviews. There it is needed the most as decisions about many pictures have to be done within short time to work efficiently; Nevertheless, this part of piwigo is unaffected by "Image Preview".