How to save data to facebook canvas game build in unity webgl player

Question

My game works correctly on the facebook canvas, which I create from unity in a webgl player, but I get no way to store data about the game anywhere. Using "Playerprefs" works, but only works in the current game session, when I restart the game, data is lost. I tried using the "Parse" sdk but found out that it does not yet support webgl. I searched a lot, but I could not get an answer. I am sure that there must be some way, because there are games on the Internet on the Internet. Does anyone know how this can be achieved.