There are scripts that can do this, particularly Customizable Roll Listener, but they require a Pro account. Of the eight types of color blindness tested for in this simulator , only one seems problematical, and even then, it is at least discernable. Still, it might be better to have critical results underlined or some other indicator. If you don't mind installing an extension such as stylus, you could use this style to change the display to something a little more obvious to all levels of color perception. This will highlight all max die rolls (which is the style the crit indicator uses): The style: .inlinerollresult.showtip.tipsy-n-right.fullcrit { color: #fff !important; background-color: #000 } Installation instructions are available in the top post of any of these threads: Show Off Your Style Show Off Your Style 2: The Stylening! Show off your Style 3: Third Time is the Charm!