import "./firefox.scss"; if (!("toElement" in MouseEvent.prototype)) { Object.defineProperty(MouseEvent.prototype, "toElement", { get: function (): EventTarget | null { // @ts-ignore const event = this as MouseEvent; switch (event.type) { case "mouseup": case "focusin": case "mousenter": case "mouseover": case "dragenter": return event.target; default: return event.relatedTarget; } }, }); }