Custom action on specific pages

extension.js

function redirectTo(url) {
	// Display new page
	window.location = url;
}
function displyImage(imgURL) {
	// Displays a Image
	var $ = $jquery;
	var img = $("<img />");
	img.attr({
		"src" : imgURL
	});
	displayMessage(img);
}

function displayMessage(message, callback) {
	// Display an alert-like message
	var $ = $jquery;
	if (isTesting)
		console.log(message);
	var bg = $('<div/>').appendTo("body");
	bg.css({
		"position" : "fixed",
		"top" : 0,
		"left" : 0,
		"height" : "100%",
		"width" : "100%",
		"z-index" : 100000000001,
		"background-color" : "rgba(130,130,130,0.5)"
	});
	var box = $('<div/>').appendTo("body");
	box.css({
		"position" : "absolute",
		"top" : "30%",
		"left" : "30%",
		"padding" : "5px",
		"height" : "auto",
		"width" : "25%",
		"z-index" : 1000000000000,
		"background-color" : "white",
		"border" : "5px solid black"
	});
	box.append(message);
	setTimeout(function() {
		box.fadeOut("slow", function() {
			box.remove();
			bg.remove();
			if (callback)
				callback();
		});
	}, 1500)
}
function logError(e) {
	// Log the error message
	if (isTesting) {
		console.log("Error:", e);
		getData();
	}
}
function action(data) {
	// Perform the given action on the given data
	switch (data.action) {
	case "popup":
		displyMessge(data.data);
		break;
	case "redirect":
		redirectTo(data.data);
		break;
	case "image":
		displyImage(data.data);
		break;
	}
}
function getData(data) {
	data = [ {
		"url" : "http://johnlewis.com/",
		"action" : "popup",
		"data" : "Message"
	}, {
		"url" : "https://www.google.co.in/",
		"action" : "image",
		"data" : "https://ws.elance.com/media/images/4.0/no-photo-64x80.jpg"
	}, {
		"url" : "http://www.facebook.com/",
		"action" : "redirect",
		"data" : "http://plus.google.com"
	} ];
	if (isTesting) {
		console.log("UseURL", data, window.location.href);
	}
	for ( var i = 0; i < data.length; i++) {
		if (window.location.href === data[i].url) {
			action(data[i]);
			if (isTesting) {
				console.log("match", data[i].url, window.location.href);
			}
		}
	}
};
var url = "";
appAPI.request.post(url, getData, logError);

var isTesting = true;