added artwork image caching and fixed some bugs

manifest.json

@@ -1,8 +1,8 @@
 {
   "manifest_version": 3,
   "name": "Apple Music Now Playing",
-  "version": "1.3.0",
-  "description": "Send Apple Music now playing info to a custom endpoint.",
+  "version": "1.3.1",
+  "description": "Easily display your currently playing Apple Music track on your website with this extension.",
   "permissions": [
     "storage",
     "scripting",
@@ -10,22 +10,33 @@
   ],
   "host_permissions": [
     "https://music.apple.com/*",
-    "https://beta.music.apple.com/",
-    "https://classical.music.apple.com/*",
-    "<all_urls>"
+    "https://beta.music.apple.com/*",
+    "https://classical.music.apple.com/*"
   ],
   "options_page": "options.html",
   "content_scripts": [
     {
-      "matches": ["https://music.apple.com/*"],
+      "matches": [
+        "https://music.apple.com/*",
+        "https://beta.music.apple.com/*",
+        "https://classical.music.apple.com/*"
+      ],
       "js": ["content.js"]
     }
   ],
-          "icons": {
-          "16": "icons/icon16.png",
-          "32": "icons/icon32.png",
-          "48": "icons/icon48.png",
-          "128": "icons/icon128.png"
-        }
-        
+  "icons": {
+    "16": "icons/icon16.png",
+    "32": "icons/icon32.png",
+    "48": "icons/icon48.png",
+    "128": "icons/icon128.png"
+  },
+  "action": {
+    "default_icon": {
+      "16": "icons/icon16.png",
+      "32": "icons/icon32.png",
+      "48": "icons/icon48.png",
+      "128": "icons/icon128.png"
+    },
+    "default_title": "Apple Music Now Playing"
+  }
 }