No search of forms
The point of a verb conjugator, to me, is mainly to solve the mystery of encountering an unknown verb form while reading. What on earth is “fisses”, just for example? What verb, what form? This conjugator has that form of course, but the search function is limited to the infinitives. So you’d have to know already exactly what you want to find out. It would be simple to implement such a search, but they’ve failed to think of it.