"Pu-hu-hu...look who's taken over your browser while you slept lamebrain! Thats right, MON-O-KUMA!"
Seems the psychotic bears no longer content with games and anime, now he's out to show fleshbags despair every click with this dark theme.
Although this particular fleshbag is responsible for the theme all Monokuma art credit goes to lazyamphy.deviantart.
*Note Minor update 7/6 made to improve background tabs.