I've been using it for over six years. In the last firefox update it wasn't loaded by default and I felt sad that I didn't have the kitten, the good thing is it was just to activate it again.

siempre lo uso, me recuerda a mi gato, me da energías para el trabajo

Very simple and clean theme. Would be nice if the maker could release a dark mode version, perhaps with a black background and a white cat doing the same thing?