gistfile1.txt

var checkInterval = 10;
Window.prototype.targetLimiter = function (checkInterval) {
	setImmediate(() => {
		window.setInterval(() => {
			if (window.document.getElementsByName('target')[0].value < 1.5) {
				window.document.getElementsByName('target')[0].value = 1.5;
			}
		}, checkInterval);
	});
}
window.targetLimiter(checkInterval);