Transform into a web extension

src/background/main.js

@@ -3,7 +3,8 @@ var allTabs = {};
 function getTabData(id) {
 	if (!allTabs.hasOwnProperty(id)) {
 		allTabs[id] = {
-			isActive: false
+			isActive: false,
+			hasData: ""
 		};
 	}
 	return allTabs[id];
@@ -19,6 +20,14 @@ function updateIcon(tabId) {
 			},
 		tabId: tabId
 	});
+	chrome.browserAction.setBadgeBackgroundColor({
+		color: [217, 0, 0, 255],
+		tabId: tabId
+	});
+	chrome.browserAction.setBadgeText({
+		text: data.hasData,
+		tabId: tabId
+	});
 }
 
 function toggleActive(tab) {