A solution to the problem you may meet Noté 5 sur 5 étoiles
Everyone that got problem should read this: https://support.mozilla.org/en-US/questions/965834?esab=a&as=aaq
It fixs the problem I met.
Noté 5 sur 5 étoiles
Although every time Firefox was restarted, the snoopy just stop moving, I found that this is a problem of Firefox, NOT the theme!
This is a great theme, and it deserves 5 stars!