Making icon grayscale when extension is off

background.js

@@ -5,6 +5,26 @@ chrome.webNavigation.onBeforeNavigate.addListener(event => main(event, 'onBefore
 chrome.webNavigation.onCreatedNavigationTarget.addListener(event => main(event, 'onCreatedNavigationTarget'));
 chrome.webNavigation.onCommitted.addListener(event => main(event, 'onCommitted'));
 
+// Listen for user turning extension on or off, to update icon
+chrome.runtime.onMessage.addListener(function (msg, sender, sendResponse) {
+  if (msg.action === "updateIcon") {
+    const manifestVersion = chrome.runtime.getManifest().manifest_version;
+    if (msg.value === 'on') {
+      if (manifestVersion === 2) {
+        chrome.browserAction.setIcon({ path: "/images/logo-128.png" });
+      } else {
+        chrome.action.setIcon({ path: "/images/logo-128.png" });
+      }
+    } else {
+      if (manifestVersion === 2) {
+        chrome.browserAction.setIcon({ path: "/images/logo-off.png" });
+      } else {
+        chrome.action.setIcon({ path: "/images/logo-off.png" });
+      }
+    }
+  }
+});
+
 function redirectToBreezeWiki(storage, eventInfo, url) {
   function processRedirect(host) {
     const subdomain = url.hostname.split(".")[0];

manifest2.json

@@ -1,6 +1,6 @@
 {
   "name": "Indie Wiki Buddy",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "Helping you discover quality independent wikis through alerts, redirects, and search filtering",
   "permissions": [
     "storage",

manifest3.json

@@ -1,6 +1,6 @@
 {
   "name": "Indie Wiki Buddy",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "Helping you discover quality independent wikis through alerts, redirects, and search filtering",
   "permissions": [
     "storage",

popup.js

@@ -305,6 +305,11 @@ function setPower(setting) {
   powerImage.src = 'images/power-' + setting + '.png';
   var powerText = document.getElementById('powerText');
   powerText.textContent = 'Extension is ' + setting;
+
+  chrome.runtime.sendMessage({
+    action: 'updateIcon',
+    value: setting
+  });
 }
 
 // Set notifications setting