Paste into Discord console to dynamically change CSS

changestyle.js

var rules = document.styleSheets[0].rules;

var subs = {
	'Whitney, "Helvetica Neue", Helvetica, Arial, sans-serif':
	'"VL PGothic", sans-serif'
};

for (var i = 0; i < rules.length; ++i) {
	var r = rules[i];
	var cssText = r.cssText;
	var sd = r.style;
	if (!sd) continue;
	var oldff = sd.fontFamily;
	var newff = subs[oldff];
	if (newff) {
		sd.fontFamily = newff;
	}
}