I remember playing at least one of these a few months ago :) I just tried RGB Challenge, every time I get one right, the "blowing up" animation freezes my brow

I remember playing at least one of these a few months ago :) I just tried RGB Challenge, every time I get one right, the "blowing up" animation freezes my browser for a couple of seconds. (in case a dev sees this) Firefox 38.0.5 on Windows 7