abstracted the URL comparison

extension/js/check.js

+var stop_url = "https://www.google.com/";
+
 chrome.tabs.query({'active': true, 'lastFocusedWindow': true}, function (tabs) {
-	var url = tabs[0].url;
-	if (url == "https://www.google.com/"){
-		document.writeln("Google!");
-	}
-	else {document.writeln("not google!");}
+        var url = tabs[0].url;
+        if (url == stop_url){
+                document.writeln("welcome to the stop url!");
+        }
+        else {document.writeln("not there yet, keep going");}
 });
+