This theme works with 52.0.2, but it needs to be re-enabled every time you restart Firefox; otherwise, the animation doesn't work. It is a great, simple, and fun animation, though, and makes the workday a bit brighter.

most cute

Writing Themes - Yeah!

Very clever!

Eu amo os temas, mas no meu Firefox 19 não funciona a parte de animação.

Brilliant! I have always loved Snoopy, this makes me feel happy like a kid again