Examine source code of What's on Beat

{
  "manifest_version": 2,
  "name": "What's on Beat",
  "description": "This simple app will show which song is playing on radio Beat right now",
  "version": "1.2resigned1",
  "browser_action": {
    "default_icon": "icon16.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [],
  "background": {
    "scripts": [
      "jquery.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d4276f48-6e63-49fc-80e8-b50c295343d0}"
    }
  }
}