Sorry for bumping the old thread but I actually understand what the OP want. He only want to avoid any technologies detect that he is using Prestashop framework. What he asking for is similar to a plugin called hide-my-wp for wordpress (and that plugin is considered as a security plugin, yes hiding your platform from public is considered one of the security approaches .. so he is asking a security question which he did not specify more)
but I don't think this plugin exist for Prestashop as Prestashop code is harder to understand compared to wordpress. Hopefully there is one available.