We are pleased that we updated our module HTML BLOCK FREE for Prestashop. Module is now in 1.4.1 version. In this update we added many new features. The most important thing is fix of "unwanted characters after save". Which mean, that module doesn't add any unwanted markups anymore. That's great news, because many of us - prestashop merchats - have got issues with this. Module supports also html style tags, javascripts and other stuff - in WYSIWYG also!.
List of new features / fixes:
Download link: html block for prestashop