cleaned up some code

background.js

@@ -1,24 +1,19 @@
 chrome.runtime.onMessage.addListener(function(request, sender, response) {
-	
-chrome.runtime.onMessage.addListener(
-function (request, sender, sendResponse) {
-     console.log(sender.tab ?
-     "from a content script:" + sender.tab.url :
-     "from the extension");
-     if (request.greeting == "hello")
-     sendResponse({ farewell: "goodbye" });
-});
-		const xhr = new XMLHttpRequest();
-		const method = request.method ? request.method.toUpperCase() : "GET";
-		xhr.open(method, request.url, true);
-		xhr.onload = () => response(xhr.responseText);
-		xhr.onerror = () => response(xhr.statusText);
-		if (method == "POST") {
-			xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
-		}
-		xhr.send(request.data);
-		return true;
+	const xhr = new XMLHttpRequest();
+	const method = request.method ? request.method.toUpperCase() : "GET";
+	xhr.open(method, request.url, true);
+	xhr.onload = () => response(xhr.responseText);
+	xhr.onerror = () => response(xhr.statusText);
+	if (method == "POST") {
+		xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
+	}
+	xhr.send(request.data);
+	return true;
 });
 
-
+chrome.runtime.onInstalled.addListener(function() {
+	chrome.storage.sync.set({color: '#3aa757'}, function() {
+		console.log("The color is green.");
+	});
+});