ChessPower

Highlight Power Play of pieces on Chess.com Shows Attacked in Red Rings, And Support in Green Rings. Board-Cells get a Border when white or black controls that field (attacks more than gets supported) Rotates Black Pieces (can be turned off in config, which is available in popup clicking on the extension icon in chrome toolbar, best pin the extension.). There you can also turn features on and off. Works with Analysis, Play Bot, and Watch Live, but is Turned off against Real Player. This Tool is for Education and not for cheating in Live games.

Screenshots from Chrome Web Store