Bouncy Ball

Shows a bouncy ball on the page when you are idle.

The ball size and color can be adjusted, or it can have a random color. Visibility/transparencym speed are also adjustable.

Improved background detection, while you can still freely adjust the Gaussian blur and tolerance parameters as well.
Adjustable idle that counts from your last active time on the page, so page refresh won't trigger the animation.
Can be turned off or on easily without removing the extension with all the settings saved.
Can be blocked on certain domains, like youtube.com (you don't want a bouncy ball while you are watching a video)