Prestashop from v1.6.0.8 contains "feature" called html purifier. Well, it's great feature - but in prestashop it causes a lot of problems. Especially when you're dealing with some custom contents in product descriptions, cms pages, category descriptions etc. In some cases HTML purifier affects also other important parts (default one!) of shop. We can easily disable html purifier. Watch video below, i show how you can disable it with several mouse clicks.